[infinispan-commits] Infinispan SVN: r1619 - in trunk/core/src: main/java/org/infinispan/container and 10 other directories.
infinispan-commits at lists.jboss.org
infinispan-commits at lists.jboss.org
Thu Mar 25 06:49:04 EDT 2010
Author: vblagojevic at jboss.com
Date: 2010-03-25 06:49:02 -0400 (Thu, 25 Mar 2010)
New Revision: 1619
Added:
trunk/core/src/main/java/org/infinispan/container/DefaultDataContainer.java
trunk/core/src/main/java/org/infinispan/eviction/EvictionThreadPolicy.java
trunk/core/src/main/java/org/infinispan/util/concurrent/BoundedConcurrentHashMap.java
Removed:
trunk/core/src/main/java/org/infinispan/container/SimpleDataContainer.java
trunk/core/src/main/java/org/infinispan/util/concurrent/BufferedConcurrentHashMap.java
Modified:
trunk/core/src/main/java/org/infinispan/config/Configuration.java
trunk/core/src/main/java/org/infinispan/container/DataContainer.java
trunk/core/src/main/java/org/infinispan/container/FIFODataContainer.java
trunk/core/src/main/java/org/infinispan/container/FIFOSimpleDataContainer.java
trunk/core/src/main/java/org/infinispan/container/LRUDataContainer.java
trunk/core/src/main/java/org/infinispan/container/LRUSimpleDataContainer.java
trunk/core/src/main/java/org/infinispan/eviction/EvictionManagerImpl.java
trunk/core/src/main/java/org/infinispan/eviction/EvictionStrategy.java
trunk/core/src/main/java/org/infinispan/factories/DataContainerFactory.java
trunk/core/src/main/resources/config-samples/all.xml
trunk/core/src/test/java/org/infinispan/config/parsing/XmlFileParsingTest.java
trunk/core/src/test/java/org/infinispan/container/SimpleDataContainerTest.java
trunk/core/src/test/java/org/infinispan/distribution/DistSyncTxFuncTest.java
trunk/core/src/test/java/org/infinispan/eviction/BaseEvictionFunctionalTest.java
trunk/core/src/test/java/org/infinispan/eviction/MarshalledValuesEvictionTest.java
trunk/core/src/test/java/org/infinispan/stress/DataContainerStressTest.java
trunk/core/src/test/java/org/infinispan/stress/MapStressTest.java
trunk/core/src/test/resources/configs/named-cache-test.xml
Log:
[ISPN-299] - Implement an LIRS eviction policy
Add eviction thread policy (new property of eviction element)
Redesign EvictionManagerImpl
Deprecate other containers
Update tests
Modified: trunk/core/src/main/java/org/infinispan/config/Configuration.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/config/Configuration.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/config/Configuration.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -23,6 +23,7 @@
import org.infinispan.distribution.DefaultConsistentHash;
import org.infinispan.eviction.EvictionStrategy;
+import org.infinispan.eviction.EvictionThreadPolicy;
import org.infinispan.factories.ComponentRegistry;
import org.infinispan.factories.annotations.Inject;
import org.infinispan.factories.annotations.SurvivesRestarts;
@@ -339,7 +340,23 @@
this.eviction.setStrategy(EvictionStrategy.NONE);
}
}
-
+
+ public EvictionThreadPolicy getEvictionThreadPolicy() {
+ return eviction.threadPolicy;
+ }
+
+ public void setEvictionThreadPolicy(EvictionThreadPolicy policy) {
+ this.eviction.setThreadPolicy(policy);
+ }
+
+ public void setEvictionThreadPolicy(String policy){
+ this.eviction.threadPolicy = EvictionThreadPolicy.valueOf(uc(policy));
+ if (this.eviction.threadPolicy == null) {
+ log.warn("Unknown thread eviction policy '" + policy + "'! Using EvictionThreadPolicy.DEFAULT");
+ this.eviction.setThreadPolicy(EvictionThreadPolicy.DEFAULT);
+ }
+ }
+
public int getEvictionMaxEntries() {
return eviction.maxEntries;
}
@@ -893,7 +910,7 @@
/** @configRef desc="Concurrency level for lock containers. Adjust this value according to the number of concurrent
* threads interating with Infinispan. Similar to the concurrencyLevel tuning parameter seen in
* the JDK's ConcurrentHashMap."*/
- protected Integer concurrencyLevel = 512;
+ protected Integer concurrencyLevel = 32;
@XmlAttribute
public void setLockAcquisitionTimeout(Long lockAcquisitionTimeout) {
@@ -1277,6 +1294,9 @@
/** @configRef desc="Maximum number of entries in a cache instance. -1 means no limit." */
protected Integer maxEntries=-1;
+
+ /** @configRef desc="Threading policy for eviction." */
+ protected EvictionThreadPolicy threadPolicy=EvictionThreadPolicy.DEFAULT;
@XmlAttribute
public void setWakeUpInterval(Long wakeUpInterval) {
@@ -1293,6 +1313,12 @@
testImmutability("strategy");
this.strategy = strategy;
}
+
+ @XmlAttribute
+ public void setThreadPolicy(EvictionThreadPolicy threadPolicy) {
+ testImmutability("threadPolicy");
+ this.threadPolicy = threadPolicy;
+ }
@XmlAttribute
public void setMaxEntries(Integer maxEntries) {
@@ -1309,6 +1335,7 @@
if (maxEntries != null ? !maxEntries.equals(that.maxEntries) : that.maxEntries != null) return false;
if (strategy != that.strategy) return false;
+ if (threadPolicy != that.threadPolicy) return false;
if (wakeUpInterval != null ? !wakeUpInterval.equals(that.wakeUpInterval) : that.wakeUpInterval != null)
return false;
@@ -1319,6 +1346,7 @@
public int hashCode() {
int result = wakeUpInterval != null ? wakeUpInterval.hashCode() : 0;
result = 31 * result + (strategy != null ? strategy.hashCode() : 0);
+ result = 31 * result + (threadPolicy != null ? threadPolicy.hashCode() : 0);
result = 31 * result + (maxEntries != null ? maxEntries.hashCode() : 0);
return result;
}
Modified: trunk/core/src/main/java/org/infinispan/container/DataContainer.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/container/DataContainer.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/container/DataContainer.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -21,19 +21,20 @@
*/
package org.infinispan.container;
+import java.util.Collection;
+import java.util.Set;
+
import org.infinispan.container.entries.InternalCacheEntry;
import org.infinispan.factories.annotations.Stop;
import org.infinispan.factories.scopes.Scope;
import org.infinispan.factories.scopes.Scopes;
-import java.util.Collection;
-import java.util.Set;
-
/**
* The main internal data structure which stores entries
*
* @author Manik Surtani (<a href="mailto:manik at jboss.org">manik at jboss.org</a>)
* @author Galder Zamarreño
+ * @author Vladimir Blagojevic
* @since 4.0
*/
@Scope(Scopes.NAMED_CACHE)
@@ -126,4 +127,13 @@
* Purges entries that have passed their expiry time
*/
void purgeExpired();
+
+
+ /**
+ * Returns a set of eviction candidates. Containers not supporting eviction should return an
+ * empty set.
+ *
+ * @return a set of entries that should be evicted from this container.
+ */
+ Set<InternalCacheEntry> getEvictionCandidates();
}
Copied: trunk/core/src/main/java/org/infinispan/container/DefaultDataContainer.java (from rev 1610, trunk/core/src/main/java/org/infinispan/container/SimpleDataContainer.java)
===================================================================
--- trunk/core/src/main/java/org/infinispan/container/DefaultDataContainer.java (rev 0)
+++ trunk/core/src/main/java/org/infinispan/container/DefaultDataContainer.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -0,0 +1,403 @@
+package org.infinispan.container;
+
+import java.util.AbstractCollection;
+import java.util.AbstractSet;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import net.jcip.annotations.ThreadSafe;
+
+import org.infinispan.Cache;
+import org.infinispan.container.entries.InternalCacheEntry;
+import org.infinispan.container.entries.InternalEntryFactory;
+import org.infinispan.eviction.EvictionStrategy;
+import org.infinispan.eviction.EvictionThreadPolicy;
+import org.infinispan.factories.annotations.Inject;
+import org.infinispan.util.Immutables;
+import org.infinispan.util.concurrent.BoundedConcurrentHashMap;
+import org.infinispan.util.concurrent.BoundedConcurrentHashMap.Eviction;
+import org.infinispan.util.concurrent.BoundedConcurrentHashMap.EvictionListener;
+
+/**
+ * Simple data container that does not order entries for eviction, implemented using two ConcurrentHashMaps, one for
+ * mortal and one for immortal entries.
+ * <p/>
+ * This container does not support eviction, in that entries are unsorted.
+ * <p/>
+ * This implementation offers O(1) performance for all operations.
+ *
+ * @author Manik Surtani
+ * @author Galder Zamarreño
+ * @author Vladimir Blagojevic
+ * @since 4.0
+ */
+ at ThreadSafe
+public class DefaultDataContainer implements DataContainer {
+ final ConcurrentMap<Object, InternalCacheEntry> immortalEntries;
+ final ConcurrentMap<Object, InternalCacheEntry> mortalEntries;
+ final AtomicInteger numEntries = new AtomicInteger(0);
+ final InternalEntryFactory entryFactory;
+ final DefaultEvictionListener evictionListener;
+ protected Cache<Object, Object> cache;
+
+
+ protected DefaultDataContainer(int concurrencyLevel) {
+ this(concurrencyLevel, false, false);
+ }
+
+ protected DefaultDataContainer(int concurrencyLevel, boolean recordCreation, boolean recordLastUsed) {
+ immortalEntries = new ConcurrentHashMap<Object, InternalCacheEntry>(128, 0.75f, concurrencyLevel);
+ mortalEntries = new ConcurrentHashMap<Object, InternalCacheEntry>(64, 0.75f, concurrencyLevel);
+ entryFactory = new InternalEntryFactory(recordCreation, recordLastUsed);
+ evictionListener = null;
+ }
+
+ protected DefaultDataContainer(int concurrencyLevel, int maxEntries, EvictionStrategy strategy, EvictionThreadPolicy policy,
+ boolean recordCreation, boolean recordLastUsed) {
+
+ // translate eviction policy and strategy
+ switch (policy) {
+ case DEFAULT:
+ evictionListener = new DefaultEvictionListener();
+ break;
+ case PIGGYBACK:
+ evictionListener = new PiggybackEvictionListener();
+ break;
+ default:
+ throw new IllegalArgumentException("No such eviction thread policy " + strategy);
+ }
+
+ Eviction eviction;
+ switch (strategy) {
+ case FIFO:
+ case LRU:
+ eviction = Eviction.LRU;
+ break;
+ case LIRS:
+ eviction = Eviction.LIRS;
+ break;
+ default:
+ throw new IllegalArgumentException("No such eviction strategy " + strategy);
+ }
+ immortalEntries = new BoundedConcurrentHashMap<Object, InternalCacheEntry>(maxEntries,concurrencyLevel, eviction, evictionListener);
+ mortalEntries = new ConcurrentHashMap<Object, InternalCacheEntry>(64, 0.75f, concurrencyLevel);
+ entryFactory = new InternalEntryFactory(recordCreation, recordLastUsed);
+ }
+
+ @Inject
+ public void initialize(Cache<Object, Object> cache) {
+ this.cache = cache;
+ }
+
+ public static DataContainer boundedDataContainer(int concurrencyLevel, int maxEntries, EvictionStrategy strategy, EvictionThreadPolicy policy) {
+ return new DefaultDataContainer(concurrencyLevel, maxEntries, strategy,policy, false, false) {
+
+ @Override
+ public int size() {
+ return immortalEntries.size() + mortalEntries.size();
+ }
+
+ @Override
+ public Set<InternalCacheEntry> getEvictionCandidates() {
+ return evictionListener.getEvicted();
+ }
+ };
+ }
+
+ public static DataContainer unBoundedDataContainer(int concurrencyLevel) {
+ return new DefaultDataContainer(concurrencyLevel) ;
+ }
+
+ @Override
+ public Set<InternalCacheEntry> getEvictionCandidates() {
+ return Collections.emptySet();
+ }
+
+ public InternalCacheEntry peek(Object key) {
+ InternalCacheEntry e = immortalEntries.get(key);
+ if (e == null) e = mortalEntries.get(key);
+ return e;
+ }
+
+ public InternalCacheEntry get(Object k) {
+ InternalCacheEntry e = peek(k);
+ if (e != null) {
+ if (e.isExpired()) {
+ mortalEntries.remove(k);
+ numEntries.getAndDecrement();
+ e = null;
+ } else {
+ e.touch();
+ }
+ }
+ return e;
+ }
+
+ protected void successfulPut(InternalCacheEntry ice, boolean newEntry) {
+ // no-op
+ }
+
+ public void put(Object k, Object v, long lifespan, long maxIdle) {
+ InternalCacheEntry e = immortalEntries.get(k);
+ if (e != null) {
+ e.setValue(v);
+ e = entryFactory.update(e, lifespan, maxIdle);
+
+ if (e.canExpire()) {
+ immortalEntries.remove(k);
+ mortalEntries.put(k, e);
+ }
+ successfulPut(e, false);
+ } else {
+ e = mortalEntries.get(k);
+ if (e != null) {
+ e.setValue(v);
+ InternalCacheEntry original = e;
+ e = entryFactory.update(e, lifespan, maxIdle);
+
+ if (!e.canExpire()) {
+ mortalEntries.remove(k);
+ immortalEntries.put(k, e);
+ } else if (e != original) {
+ // the entry has changed type, but still can expire!
+ mortalEntries.put(k, e);
+ }
+ successfulPut(e, false);
+ } else {
+ // this is a brand-new entry
+ numEntries.getAndIncrement();
+ e = entryFactory.createNewEntry(k, v, lifespan, maxIdle);
+ if (e.canExpire())
+ mortalEntries.put(k, e);
+ else
+ immortalEntries.put(k, e);
+ successfulPut(e, true);
+ }
+ }
+ }
+
+ public boolean containsKey(Object k) {
+ InternalCacheEntry ice = peek(k);
+ if (ice != null && ice.isExpired()) {
+ mortalEntries.remove(k);
+ numEntries.getAndDecrement();
+ ice = null;
+ }
+ return ice != null;
+ }
+
+ public InternalCacheEntry remove(Object k) {
+ InternalCacheEntry e = immortalEntries.remove(k);
+ if (e == null) e = mortalEntries.remove(k);
+ if (e != null) numEntries.getAndDecrement();
+
+ return e == null || e.isExpired() ? null : e;
+ }
+
+ public int size() {
+ return numEntries.get();
+ }
+
+ public void clear() {
+ immortalEntries.clear();
+ mortalEntries.clear();
+ numEntries.set(0);
+ }
+
+ public Set<Object> keySet() {
+ return new KeySet();
+ }
+
+ public Collection<Object> values() {
+ return new Values();
+ }
+
+ public Set<InternalCacheEntry> entrySet() {
+ return new EntrySet();
+ }
+
+ public void purgeExpired() {
+ for (Iterator<InternalCacheEntry> entries = mortalEntries.values().iterator(); entries.hasNext();) {
+ InternalCacheEntry e = entries.next();
+ if (e.isExpired()) {
+ entries.remove();
+ numEntries.getAndDecrement();
+ }
+ }
+ }
+
+ public Iterator<InternalCacheEntry> iterator() {
+ return new EntryIterator(immortalEntries.values().iterator(), mortalEntries.values().iterator());
+ }
+
+ private class DefaultEvictionListener implements EvictionListener<Object, InternalCacheEntry>{
+ final List <InternalCacheEntry> evicted = Collections.synchronizedList(new LinkedList<InternalCacheEntry>());
+
+ @Override
+ public void evicted(Object key, InternalCacheEntry value) {
+ evicted.add(value);
+ }
+
+ public Set<InternalCacheEntry> getEvicted() {
+ synchronized (evicted) {
+ return new HashSet<InternalCacheEntry>(evicted);
+ }
+ }
+ }
+
+ private class PiggybackEvictionListener extends DefaultEvictionListener{
+
+ @Override
+ public void evicted(Object key, InternalCacheEntry value) {
+ cache.getAdvancedCache().evict(key);
+ }
+
+ public Set<InternalCacheEntry> getEvicted() {
+ return Collections.emptySet();
+ }
+ }
+
+ private class KeySet extends AbstractSet<Object> {
+ final Set<Object> immortalKeys;
+ final Set<Object> mortalKeys;
+
+ public KeySet() {
+ immortalKeys = immortalEntries.keySet();
+ mortalKeys = mortalEntries.keySet();
+ }
+
+ public Iterator<Object> iterator() {
+ return new KeyIterator(immortalKeys.iterator(), mortalKeys.iterator());
+ }
+
+ public void clear() {
+ throw new UnsupportedOperationException();
+ }
+
+ public boolean contains(Object o) {
+ return immortalKeys.contains(o) || mortalKeys.contains(o);
+ }
+
+ public boolean remove(Object o) {
+ throw new UnsupportedOperationException();
+ }
+
+ public int size() {
+ return immortalKeys.size() + mortalKeys.size();
+ }
+ }
+
+ private static class KeyIterator implements Iterator<Object> {
+ Iterator<Iterator<Object>> metaIterator;
+ Iterator<Object> currentIterator;
+
+ private KeyIterator(Iterator<Object> immortalIterator, Iterator<Object> mortalIterator) {
+ metaIterator = Arrays.asList(immortalIterator, mortalIterator).iterator();
+ if (metaIterator.hasNext()) currentIterator = metaIterator.next();
+ }
+
+ public boolean hasNext() {
+ boolean hasNext = currentIterator.hasNext();
+ while (!hasNext && metaIterator.hasNext()) {
+ currentIterator = metaIterator.next();
+ hasNext = currentIterator.hasNext();
+ }
+ return hasNext;
+ }
+
+ @SuppressWarnings("unchecked")
+ public Object next() {
+ return currentIterator.next();
+ }
+
+ public void remove() {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ private class EntrySet extends AbstractSet<InternalCacheEntry> {
+ public Iterator<InternalCacheEntry> iterator() {
+ return new ImmutableEntryIterator(immortalEntries.values().iterator(), mortalEntries.values().iterator());
+ }
+
+ @Override
+ public int size() {
+ return immortalEntries.size() + mortalEntries.size();
+ }
+ }
+
+ private static class MortalInmortalIterator {
+ Iterator<Iterator<InternalCacheEntry>> metaIterator;
+ Iterator<InternalCacheEntry> currentIterator;
+
+ private MortalInmortalIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
+ metaIterator = Arrays.asList(immortalIterator, mortalIterator).iterator();
+ if (metaIterator.hasNext()) currentIterator = metaIterator.next();
+ }
+
+ public boolean hasNext() {
+ boolean hasNext = currentIterator.hasNext();
+ while (!hasNext && metaIterator.hasNext()) {
+ currentIterator = metaIterator.next();
+ hasNext = currentIterator.hasNext();
+ }
+ return hasNext;
+ }
+
+ public void remove() {
+ throw new UnsupportedOperationException();
+ }
+ }
+
+ private class EntryIterator extends MortalInmortalIterator implements Iterator<InternalCacheEntry> {
+ private EntryIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
+ super(immortalIterator, mortalIterator);
+ }
+
+ @SuppressWarnings("unchecked")
+ public InternalCacheEntry next() {
+ return currentIterator.next();
+ }
+ }
+
+ private class ImmutableEntryIterator extends MortalInmortalIterator implements Iterator<InternalCacheEntry> {
+ private ImmutableEntryIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
+ super(immortalIterator, mortalIterator);
+ }
+
+ public InternalCacheEntry next() {
+ return Immutables.immutableInternalCacheEntry(currentIterator.next());
+ }
+ }
+
+ private class Values extends AbstractCollection<Object> {
+ @Override
+ public Iterator<Object> iterator() {
+ return new ValueIterator(immortalEntries.values().iterator(), mortalEntries.values().iterator());
+ }
+
+ @Override
+ public int size() {
+ return immortalEntries.size() + mortalEntries.size();
+ }
+ }
+
+ private class ValueIterator extends MortalInmortalIterator implements Iterator<Object> {
+ private ValueIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
+ super(immortalIterator, mortalIterator);
+ }
+
+ public Object next() {
+ return currentIterator.next().getValue();
+ }
+ }
+}
Modified: trunk/core/src/main/java/org/infinispan/container/FIFODataContainer.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/container/FIFODataContainer.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/container/FIFODataContainer.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -8,6 +8,7 @@
import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.Collection;
+import java.util.Collections;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
@@ -38,6 +39,7 @@
* @since 4.0
*/
@ThreadSafe
+ at Deprecated
public class FIFODataContainer implements DataContainer {
InternalEntryFactory entryFactory = new InternalEntryFactory(false, false);
@@ -860,4 +862,9 @@
public Iterator<InternalCacheEntry> iterator() {
return new EntryIterator();
}
+
+ @Override
+ public Set<InternalCacheEntry> getEvictionCandidates() {
+ return Collections.emptySet();
+ }
}
Modified: trunk/core/src/main/java/org/infinispan/container/FIFOSimpleDataContainer.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/container/FIFOSimpleDataContainer.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/container/FIFOSimpleDataContainer.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -9,7 +9,7 @@
import java.util.Iterator;
/**
- * Based on the same techniques outlined in the {@link SimpleDataContainer}, this implementation always forces the
+ * Based on the same techniques outlined in the {@link DefaultDataContainer}, this implementation always forces the
* collection of creation timestamps for entries. This means that {@link org.infinispan.container.entries.ImmortalCacheEntry}
* and {@link org.infinispan.container.entries.TransientCacheEntry} are never used, since only {@link org.infinispan.container.entries.MortalCacheEntry}
* and {@link org.infinispan.container.entries.TransientMortalCacheEntry} instances capture timestamps.
@@ -26,8 +26,9 @@
* @author Manik Surtani
* @since 4.0
*/
+ at Deprecated
@ThreadSafe
-public class FIFOSimpleDataContainer extends SimpleDataContainer {
+public class FIFOSimpleDataContainer extends DefaultDataContainer {
// This is to facilitate faster sorting. DO we really care about millisecond accuracy when ordering the collection?
final static int DEFAULT_TIMESTAMP_GRANULARITY = 1000;
Modified: trunk/core/src/main/java/org/infinispan/container/LRUDataContainer.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/container/LRUDataContainer.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/container/LRUDataContainer.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -20,6 +20,7 @@
* @since 4.0
*/
@ThreadSafe
+ at Deprecated
public class LRUDataContainer extends FIFODataContainer {
public LRUDataContainer(int concurrencyLevel) {
Modified: trunk/core/src/main/java/org/infinispan/container/LRUSimpleDataContainer.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/container/LRUSimpleDataContainer.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/container/LRUSimpleDataContainer.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -6,7 +6,7 @@
import java.util.Comparator;
/**
- * Based on the same techniques outlined in the {@link SimpleDataContainer}, this implementation always forces the
+ * Based on the same techniques outlined in the {@link DefaultDataContainer}, this implementation always forces the
* collection of last used timestamps for entries. This means that {@link org.infinispan.container.entries.ImmortalCacheEntry}
* and {@link org.infinispan.container.entries.MortalCacheEntry} are never used, since only {@link org.infinispan.container.entries.TransientCacheEntry}
* and {@link org.infinispan.container.entries.TransientMortalCacheEntry} instances capture timestamps.
@@ -24,6 +24,7 @@
* @since 4.0
*/
@ThreadSafe
+ at Deprecated
public class LRUSimpleDataContainer extends FIFOSimpleDataContainer {
public LRUSimpleDataContainer(int concurrencyLevel) {
super(concurrencyLevel, false, true, new LRUComparator(DEFAULT_TIMESTAMP_GRANULARITY));
Deleted: trunk/core/src/main/java/org/infinispan/container/SimpleDataContainer.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/container/SimpleDataContainer.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/container/SimpleDataContainer.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -1,299 +0,0 @@
-package org.infinispan.container;
-
-import net.jcip.annotations.ThreadSafe;
-import org.infinispan.container.entries.InternalCacheEntry;
-import org.infinispan.container.entries.InternalEntryFactory;
-import org.infinispan.util.Immutables;
-
-import java.util.AbstractCollection;
-import java.util.AbstractSet;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Iterator;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.atomic.AtomicInteger;
-
-/**
- * Simple data container that does not order entries for eviction, implemented using two ConcurrentHashMaps, one for
- * mortal and one for immortal entries.
- * <p/>
- * This container does not support eviction, in that entries are unsorted.
- * <p/>
- * This implementation offers O(1) performance for all operations.
- *
- * @author Manik Surtani
- * @author Galder Zamarreño
- * @since 4.0
- */
- at ThreadSafe
-public class SimpleDataContainer implements DataContainer {
- final ConcurrentMap<Object, InternalCacheEntry> immortalEntries;
- final ConcurrentMap<Object, InternalCacheEntry> mortalEntries;
- final AtomicInteger numEntries = new AtomicInteger(0);
- final InternalEntryFactory entryFactory;
-
-
- public SimpleDataContainer(int concurrencyLevel) {
- this(concurrencyLevel, false, false);
- }
-
- SimpleDataContainer(int concurrencyLevel, boolean recordCreation, boolean recordLastUsed) {
- immortalEntries = new ConcurrentHashMap<Object, InternalCacheEntry>(128, 0.75f, concurrencyLevel);
- mortalEntries = new ConcurrentHashMap<Object, InternalCacheEntry>(64, 0.75f, concurrencyLevel);
- entryFactory = new InternalEntryFactory(recordCreation, recordLastUsed);
- }
-
- public InternalCacheEntry peek(Object key) {
- InternalCacheEntry e = immortalEntries.get(key);
- if (e == null) e = mortalEntries.get(key);
- return e;
- }
-
- public InternalCacheEntry get(Object k) {
- InternalCacheEntry e = peek(k);
- if (e != null) {
- if (e.isExpired()) {
- mortalEntries.remove(k);
- numEntries.getAndDecrement();
- e = null;
- } else {
- e.touch();
- }
- }
- return e;
- }
-
- protected void successfulPut(InternalCacheEntry ice, boolean newEntry) {
- // no-op
- }
-
- public void put(Object k, Object v, long lifespan, long maxIdle) {
- InternalCacheEntry e = immortalEntries.get(k);
- if (e != null) {
- e.setValue(v);
- e = entryFactory.update(e, lifespan, maxIdle);
-
- if (e.canExpire()) {
- immortalEntries.remove(k);
- mortalEntries.put(k, e);
- }
- successfulPut(e, false);
- } else {
- e = mortalEntries.get(k);
- if (e != null) {
- e.setValue(v);
- InternalCacheEntry original = e;
- e = entryFactory.update(e, lifespan, maxIdle);
-
- if (!e.canExpire()) {
- mortalEntries.remove(k);
- immortalEntries.put(k, e);
- } else if (e != original) {
- // the entry has changed type, but still can expire!
- mortalEntries.put(k, e);
- }
- successfulPut(e, false);
- } else {
- // this is a brand-new entry
- numEntries.getAndIncrement();
- e = entryFactory.createNewEntry(k, v, lifespan, maxIdle);
- if (e.canExpire())
- mortalEntries.put(k, e);
- else
- immortalEntries.put(k, e);
- successfulPut(e, true);
- }
- }
- }
-
- public boolean containsKey(Object k) {
- InternalCacheEntry ice = peek(k);
- if (ice != null && ice.isExpired()) {
- mortalEntries.remove(k);
- numEntries.getAndDecrement();
- ice = null;
- }
- return ice != null;
- }
-
- public InternalCacheEntry remove(Object k) {
- InternalCacheEntry e = immortalEntries.remove(k);
- if (e == null) e = mortalEntries.remove(k);
- if (e != null) numEntries.getAndDecrement();
-
- return e == null || e.isExpired() ? null : e;
- }
-
- public int size() {
- return numEntries.get();
- }
-
- public void clear() {
- immortalEntries.clear();
- mortalEntries.clear();
- numEntries.set(0);
- }
-
- public Set<Object> keySet() {
- return new KeySet();
- }
-
- public Collection<Object> values() {
- return new Values();
- }
-
- public Set<InternalCacheEntry> entrySet() {
- return new EntrySet();
- }
-
- public void purgeExpired() {
- for (Iterator<InternalCacheEntry> entries = mortalEntries.values().iterator(); entries.hasNext();) {
- InternalCacheEntry e = entries.next();
- if (e.isExpired()) {
- entries.remove();
- numEntries.getAndDecrement();
- }
- }
- }
-
- public Iterator<InternalCacheEntry> iterator() {
- return new EntryIterator(immortalEntries.values().iterator(), mortalEntries.values().iterator());
- }
-
- private class KeySet extends AbstractSet<Object> {
- final Set<Object> immortalKeys;
- final Set<Object> mortalKeys;
-
- public KeySet() {
- immortalKeys = immortalEntries.keySet();
- mortalKeys = mortalEntries.keySet();
- }
-
- public Iterator<Object> iterator() {
- return new KeyIterator(immortalKeys.iterator(), mortalKeys.iterator());
- }
-
- public void clear() {
- throw new UnsupportedOperationException();
- }
-
- public boolean contains(Object o) {
- return immortalKeys.contains(o) || mortalKeys.contains(o);
- }
-
- public boolean remove(Object o) {
- throw new UnsupportedOperationException();
- }
-
- public int size() {
- return immortalKeys.size() + mortalKeys.size();
- }
- }
-
- private static class KeyIterator implements Iterator<Object> {
- Iterator<Iterator<Object>> metaIterator;
- Iterator<Object> currentIterator;
-
- private KeyIterator(Iterator<Object> immortalIterator, Iterator<Object> mortalIterator) {
- metaIterator = Arrays.asList(immortalIterator, mortalIterator).iterator();
- if (metaIterator.hasNext()) currentIterator = metaIterator.next();
- }
-
- public boolean hasNext() {
- boolean hasNext = currentIterator.hasNext();
- while (!hasNext && metaIterator.hasNext()) {
- currentIterator = metaIterator.next();
- hasNext = currentIterator.hasNext();
- }
- return hasNext;
- }
-
- @SuppressWarnings("unchecked")
- public Object next() {
- return currentIterator.next();
- }
-
- public void remove() {
- throw new UnsupportedOperationException();
- }
- }
-
- private class EntrySet extends AbstractSet<InternalCacheEntry> {
- public Iterator<InternalCacheEntry> iterator() {
- return new ImmutableEntryIterator(immortalEntries.values().iterator(), mortalEntries.values().iterator());
- }
-
- @Override
- public int size() {
- return immortalEntries.size() + mortalEntries.size();
- }
- }
-
- private static class MortalInmortalIterator {
- Iterator<Iterator<InternalCacheEntry>> metaIterator;
- Iterator<InternalCacheEntry> currentIterator;
-
- private MortalInmortalIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
- metaIterator = Arrays.asList(immortalIterator, mortalIterator).iterator();
- if (metaIterator.hasNext()) currentIterator = metaIterator.next();
- }
-
- public boolean hasNext() {
- boolean hasNext = currentIterator.hasNext();
- while (!hasNext && metaIterator.hasNext()) {
- currentIterator = metaIterator.next();
- hasNext = currentIterator.hasNext();
- }
- return hasNext;
- }
-
- public void remove() {
- throw new UnsupportedOperationException();
- }
- }
-
- private class EntryIterator extends MortalInmortalIterator implements Iterator<InternalCacheEntry> {
- private EntryIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
- super(immortalIterator, mortalIterator);
- }
-
- @SuppressWarnings("unchecked")
- public InternalCacheEntry next() {
- return currentIterator.next();
- }
- }
-
- private class ImmutableEntryIterator extends MortalInmortalIterator implements Iterator<InternalCacheEntry> {
- private ImmutableEntryIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
- super(immortalIterator, mortalIterator);
- }
-
- public InternalCacheEntry next() {
- return Immutables.immutableInternalCacheEntry(currentIterator.next());
- }
- }
-
- private class Values extends AbstractCollection<Object> {
- @Override
- public Iterator<Object> iterator() {
- return new ValueIterator(immortalEntries.values().iterator(), mortalEntries.values().iterator());
- }
-
- @Override
- public int size() {
- return immortalEntries.size() + mortalEntries.size();
- }
- }
-
- private class ValueIterator extends MortalInmortalIterator implements Iterator<Object> {
- private ValueIterator(Iterator<InternalCacheEntry> immortalIterator, Iterator<InternalCacheEntry> mortalIterator) {
- super(immortalIterator, mortalIterator);
- }
-
- public Object next() {
- return currentIterator.next().getValue();
- }
- }
-}
Modified: trunk/core/src/main/java/org/infinispan/eviction/EvictionManagerImpl.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/eviction/EvictionManagerImpl.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/eviction/EvictionManagerImpl.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -17,6 +17,7 @@
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
+import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
@@ -28,7 +29,7 @@
public class EvictionManagerImpl implements EvictionManager {
private static final Log log = LogFactory.getLog(EvictionManagerImpl.class);
private static final boolean trace = log.isTraceEnabled();
- ScheduledFuture evictionTask;
+ ScheduledFuture <?> evictionTask;
// components to be injected
ScheduledExecutorService executor;
@@ -108,28 +109,23 @@
}
// finally iterate through data container if too big
- int dcsz = dataContainer.size();
- if (dcsz > maxEntries) {
+ Set<InternalCacheEntry> evictionCandidates = dataContainer.getEvictionCandidates();
+ if(!evictionCandidates.isEmpty()) {
AdvancedCache<Object, Object> ac = cache.getAdvancedCache();
if (trace) {
- log.trace("Data container is larger than maxEntries, size is {0}. Evicting...", dcsz);
+ log.trace("Evicting data container entries");
start = System.currentTimeMillis();
- }
- for (InternalCacheEntry ice : dataContainer) {
- Object k = ice.getKey();
- try {
- dcsz = dataContainer.size();
- if (dcsz > maxEntries) {
+ }
+ for (InternalCacheEntry entry : evictionCandidates) {
+ Object k = entry.getKey();
+ try {
if (trace) log.trace("Attempting to evict key [{0}]", k);
ac.withFlags(FAIL_SILENTLY).evict(k);
- } else {
- if (trace) log.trace("Evicted enough entries");
- break;
}
- } catch (Exception e) {
+ catch (Exception e) {
log.warn("Caught exception when iterating through data container. Current entry is under key [{0}]", e, k);
}
- }
+ }
if (trace)
log.trace("Eviction process completed in {0}", Util.prettyPrintTime(System.currentTimeMillis() - start));
} else {
Modified: trunk/core/src/main/java/org/infinispan/eviction/EvictionStrategy.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/eviction/EvictionStrategy.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/eviction/EvictionStrategy.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -10,7 +10,8 @@
NONE,
UNORDERED,
FIFO,
- LRU;
+ LRU,
+ LIRS;
public boolean isEnabled() {
return this != NONE;
Added: trunk/core/src/main/java/org/infinispan/eviction/EvictionThreadPolicy.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/eviction/EvictionThreadPolicy.java (rev 0)
+++ trunk/core/src/main/java/org/infinispan/eviction/EvictionThreadPolicy.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -0,0 +1,12 @@
+package org.infinispan.eviction;
+
+/**
+ * Supported eviction thread policy
+ *
+ * @author Vladimir Blagojevic
+ * @since 4.0
+ */
+public enum EvictionThreadPolicy {
+ PIGGYBACK,
+ DEFAULT;
+}
Modified: trunk/core/src/main/java/org/infinispan/factories/DataContainerFactory.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/factories/DataContainerFactory.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/factories/DataContainerFactory.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -23,32 +23,40 @@
import org.infinispan.config.ConfigurationException;
import org.infinispan.container.DataContainer;
-import org.infinispan.container.FIFOSimpleDataContainer;
-import org.infinispan.container.LRUSimpleDataContainer;
-import org.infinispan.container.SimpleDataContainer;
+import org.infinispan.container.DefaultDataContainer;
+import org.infinispan.eviction.EvictionStrategy;
+import org.infinispan.eviction.EvictionThreadPolicy;
import org.infinispan.factories.annotations.DefaultFactoryFor;
/**
* Constructs the data container
- *
+ *
* @author Manik Surtani (<a href="mailto:manik at jboss.org">manik at jboss.org</a>)
+ * @author Vladimir Blagojevic
* @since 4.0
*/
@DefaultFactoryFor(classes = DataContainer.class)
-public class DataContainerFactory extends AbstractNamedCacheComponentFactory implements AutoInstantiableFactory {
+public class DataContainerFactory extends AbstractNamedCacheComponentFactory implements
+ AutoInstantiableFactory {
@SuppressWarnings("unchecked")
public <T> T construct(Class<T> componentType) {
- switch (configuration.getEvictionStrategy()) {
+ EvictionStrategy st = configuration.getEvictionStrategy();
+ int level = configuration.getConcurrencyLevel();
+
+ switch (st) {
case NONE:
case UNORDERED:
- return (T) new SimpleDataContainer(configuration.getConcurrencyLevel());
+ return (T) DefaultDataContainer.unBoundedDataContainer(level);
+ case LRU:
case FIFO:
- return (T) new FIFOSimpleDataContainer(configuration.getConcurrencyLevel());
- case LRU:
- return (T) new LRUSimpleDataContainer(configuration.getConcurrencyLevel());
+ case LIRS:
+ int maxEntries = configuration.getEvictionMaxEntries();
+ EvictionThreadPolicy policy = configuration.getEvictionThreadPolicy();
+ return (T) DefaultDataContainer.boundedDataContainer(level, maxEntries, st, policy);
default:
- throw new ConfigurationException("Unknown eviction strategy " + configuration.getEvictionStrategy());
+ throw new ConfigurationException("Unknown eviction strategy "
+ + configuration.getEvictionStrategy());
}
}
}
Added: trunk/core/src/main/java/org/infinispan/util/concurrent/BoundedConcurrentHashMap.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/util/concurrent/BoundedConcurrentHashMap.java (rev 0)
+++ trunk/core/src/main/java/org/infinispan/util/concurrent/BoundedConcurrentHashMap.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -0,0 +1,1857 @@
+/*
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/licenses/publicdomain
+ *
+ * Modified for https://jira.jboss.org/jira/browse/ISPN-299
+ * Includes ideas described in http://portal.acm.org/citation.cfm?id=1547428
+ *
+ */
+
+package org.infinispan.util.concurrent;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.locks.*;
+import java.util.*;
+import java.io.Serializable;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+/**
+ * A hash table supporting full concurrency of retrievals and
+ * adjustable expected concurrency for updates. This class obeys the
+ * same functional specification as {@link java.util.Hashtable}, and
+ * includes versions of methods corresponding to each method of
+ * <tt>Hashtable</tt>. However, even though all operations are
+ * thread-safe, retrieval operations do <em>not</em> entail locking,
+ * and there is <em>not</em> any support for locking the entire table
+ * in a way that prevents all access. This class is fully
+ * interoperable with <tt>Hashtable</tt> in programs that rely on its
+ * thread safety but not on its synchronization details.
+ *
+ * <p> Retrieval operations (including <tt>get</tt>) generally do not
+ * block, so may overlap with update operations (including
+ * <tt>put</tt> and <tt>remove</tt>). Retrievals reflect the results
+ * of the most recently <em>completed</em> update operations holding
+ * upon their onset. For aggregate operations such as <tt>putAll</tt>
+ * and <tt>clear</tt>, concurrent retrievals may reflect insertion or
+ * removal of only some entries. Similarly, Iterators and
+ * Enumerations return elements reflecting the state of the hash table
+ * at some point at or since the creation of the iterator/enumeration.
+ * They do <em>not</em> throw {@link ConcurrentModificationException}.
+ * However, iterators are designed to be used by only one thread at a time.
+ *
+ * <p> The allowed concurrency among update operations is guided by
+ * the optional <tt>concurrencyLevel</tt> constructor argument
+ * (default <tt>16</tt>), which is used as a hint for internal sizing. The
+ * table is internally partitioned to try to permit the indicated
+ * number of concurrent updates without contention. Because placement
+ * in hash tables is essentially random, the actual concurrency will
+ * vary. Ideally, you should choose a value to accommodate as many
+ * threads as will ever concurrently modify the table. Using a
+ * significantly higher value than you need can waste space and time,
+ * and a significantly lower value can lead to thread contention. But
+ * overestimates and underestimates within an order of magnitude do
+ * not usually have much noticeable impact. A value of one is
+ * appropriate when it is known that only one thread will modify and
+ * all others will only read. Also, resizing this or any other kind of
+ * hash table is a relatively slow operation, so, when possible, it is
+ * a good idea to provide estimates of expected table sizes in
+ * constructors.
+ *
+ * <p>This class and its views and iterators implement all of the
+ * <em>optional</em> methods of the {@link Map} and {@link Iterator}
+ * interfaces.
+ *
+ * <p> Like {@link Hashtable} but unlike {@link HashMap}, this class
+ * does <em>not</em> allow <tt>null</tt> to be used as a key or value.
+ *
+ * <p>This class is a member of the
+ * <a href="{@docRoot}/../technotes/guides/collections/index.html">
+ * Java Collections Framework</a>.
+ *
+ * @since 1.5
+ * @author Doug Lea
+ * @param <K> the type of keys maintained by this map
+ * @param <V> the type of mapped values
+ */
+public class BoundedConcurrentHashMap<K, V> extends AbstractMap<K, V>
+ implements ConcurrentMap<K, V>, Serializable {
+ private static final long serialVersionUID = 7249069246763182397L;
+
+ /*
+ * The basic strategy is to subdivide the table among Segments,
+ * each of which itself is a concurrently readable hash table.
+ */
+
+ /* ---------------- Constants -------------- */
+
+ /**
+ * The default initial capacity for this table,
+ * used when not otherwise specified in a constructor.
+ */
+ static final int DEFAULT_MAXIMUM_CAPACITY = 512;
+
+ /**
+ * The default load factor for this table, used when not
+ * otherwise specified in a constructor.
+ */
+ static final float DEFAULT_LOAD_FACTOR = 0.75f;
+
+ /**
+ * The default concurrency level for this table, used when not
+ * otherwise specified in a constructor.
+ */
+ static final int DEFAULT_CONCURRENCY_LEVEL = 16;
+
+ /**
+ * The maximum capacity, used if a higher value is implicitly
+ * specified by either of the constructors with arguments. MUST
+ * be a power of two <= 1<<30 to ensure that entries are indexable
+ * using ints.
+ */
+ static final int MAXIMUM_CAPACITY = 1 << 30;
+
+ /**
+ * The maximum number of segments to allow; used to bound
+ * constructor arguments.
+ */
+ static final int MAX_SEGMENTS = 1 << 16; // slightly conservative
+
+ /**
+ * Number of unsynchronized retries in size and containsValue
+ * methods before resorting to locking. This is used to avoid
+ * unbounded retries if tables undergo continuous modification
+ * which would make it impossible to obtain an accurate result.
+ */
+ static final int RETRIES_BEFORE_LOCK = 2;
+
+ /* ---------------- Fields -------------- */
+
+ /**
+ * Mask value for indexing into segments. The upper bits of a
+ * key's hash code are used to choose the segment.
+ */
+ final int segmentMask;
+
+ /**
+ * Shift value for indexing within segments.
+ */
+ final int segmentShift;
+
+ /**
+ * The segments, each of which is a specialized hash table
+ */
+ final Segment<K,V>[] segments;
+
+ transient Set<K> keySet;
+ transient Set<Map.Entry<K,V>> entrySet;
+ transient Collection<V> values;
+
+ /* ---------------- Small Utilities -------------- */
+
+ /**
+ * Applies a supplemental hash function to a given hashCode, which
+ * defends against poor quality hash functions. This is critical
+ * because ConcurrentHashMap uses power-of-two length hash tables,
+ * that otherwise encounter collisions for hashCodes that do not
+ * differ in lower or upper bits.
+ */
+ private static int hash(int h) {
+ // Spread bits to regularize both segment and index locations,
+ // using variant of single-word Wang/Jenkins hash.
+ h += (h << 15) ^ 0xffffcd7d;
+ h ^= (h >>> 10);
+ h += (h << 3);
+ h ^= (h >>> 6);
+ h += (h << 2) + (h << 14);
+ return h ^ (h >>> 16);
+ }
+
+ /**
+ * Returns the segment that should be used for key with given hash
+ * @param hash the hash code for the key
+ * @return the segment
+ */
+ final Segment<K,V> segmentFor(int hash) {
+ return segments[(hash >>> segmentShift) & segmentMask];
+ }
+
+ /* ---------------- Inner Classes -------------- */
+
+ /**
+ * ConcurrentHashMap list entry. Note that this is never exported
+ * out as a user-visible Map.Entry.
+ *
+ * Because the value field is volatile, not final, it is legal wrt
+ * the Java Memory Model for an unsynchronized reader to see null
+ * instead of initial value when read via a data race. Although a
+ * reordering leading to this is not likely to ever actually
+ * occur, the Segment.readValueUnderLock method is used as a
+ * backup in case a null (pre-initialized) value is ever seen in
+ * an unsynchronized access method.
+ */
+ static final class HashEntry<K, V> {
+ final K key;
+ final int hash;
+ volatile V value;
+ final HashEntry<K, V> next;
+ volatile Recency state;
+
+ HashEntry(K key, int hash, HashEntry<K, V> next, V value) {
+ this.key = key;
+ this.hash = hash;
+ this.next = next;
+ this.value = value;
+ this.state = Recency.HIR_RESIDENT;
+ }
+
+ public int hashCode() {
+ int result = 17;
+ result = (result * 31) + hash;
+ result = (result * 31) + key.hashCode();
+ return result;
+ }
+
+ public boolean equals(Object o) {
+ // HashEntry is internal class, never leaks out of CHM, hence slight optimization
+ if (this == o)
+ return true;
+ if (o == null)
+ return false;
+ HashEntry<?, ?> other = (HashEntry<?, ?>) o;
+ return hash == other.hash && key.equals(other.key);
+ }
+
+ public void transitionToLIRResident() {
+ state = Recency.LIR_RESIDENT;
+ }
+
+ public void transitionHIRResidentToHIRNonResident() {
+ state = Recency.HIR_NONRESIDENT;
+ }
+
+ public void transitionLIRResidentToHIRResident() {
+ state = Recency.HIR_RESIDENT;
+ }
+
+ public Recency recency() {
+ return state;
+ }
+
+ @SuppressWarnings("unchecked")
+ static <K, V> HashEntry<K, V>[] newArray(int i) {
+ return new HashEntry[i];
+ }
+ }
+
+ private enum Recency {
+ HIR_RESIDENT, LIR_RESIDENT, HIR_NONRESIDENT
+ }
+
+ public enum Eviction {
+ NONE {
+ @Override
+ public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
+ return new NullEvictionPolicy<K, V>();
+ }
+ },
+ LRU {
+
+ @Override
+ public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
+ return new LRU<K, V>(s,capacity,lf,capacity*10,lf);
+ }
+ },
+ LIRS {
+ @Override
+ public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
+ return new LIRS<K,V>(s,capacity,lf,capacity*10,lf);
+ }
+ };
+
+ abstract <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf);
+ }
+
+ public interface EvictionListener<K, V> {
+ void evicted(K key, V value);
+ }
+
+ static class NullEvictionListener<K,V> implements EvictionListener<K, V>{
+ @Override
+ public void evicted(K key, V value) {
+ }
+ }
+
+ public interface EvictionPolicy<K, V> {
+
+ public final static int MAX_BATCH_SIZE = 64;
+
+ /**
+ * Invokes eviction policy algorithm and returns set of evicted entries.
+ *
+ * <p>
+ * Set cannot be null but could possibly be an empty set.
+ *
+ * @return set of evicted entries.
+ */
+ Set<HashEntry<K, V>> execute();
+
+ /**
+ * Invoked to notify EvictionPolicy implementation that there has been an attempt to access
+ * an entry in Segment, however that entry was not present in Segment.
+ *
+ * @param e
+ * accessed entry in Segment
+ */
+ void onEntryMiss(HashEntry<K, V> e);
+
+ /**
+ * Invoked to notify EvictionPolicy implementation that an entry in Segment has been
+ * accessed. Returns true if batching threshold has been reached, false otherwise.
+ * <p>
+ * Note that this method is potentially invoked without holding a lock on Segment.
+ *
+ * @return true if batching threshold has been reached, false otherwise.
+ *
+ * @param e
+ * accessed entry in Segment
+ */
+ boolean onEntryHit(HashEntry<K, V> e);
+
+ /**
+ * Invoked to notify EvictionPolicy implementation that an entry e has been removed from
+ * Segment.
+ *
+ * @param e
+ * removed entry in Segment
+ */
+ void onEntryRemove(HashEntry<K, V> e);
+
+ /**
+ * Invoked to notify EvictionPolicy implementation that all Segment entries have been
+ * cleared.
+ *
+ */
+ void clear();
+
+ /**
+ * Returns type of eviction algorithm (strategy).
+ *
+ * @return type of eviction algorithm
+ */
+ Eviction strategy();
+
+ /**
+ * Returns true if batching threshold has expired, false otherwise.
+ * <p>
+ * Note that this method is potentially invoked without holding a lock on Segment.
+ *
+ * @return true if batching threshold has expired, false otherwise.
+ */
+ boolean thresholdExpired();
+ }
+
+ static class NullEvictionPolicy<K, V> implements EvictionPolicy<K, V> {
+
+ @Override
+ public void clear() {
+ }
+
+ @Override
+ public Set<HashEntry<K, V>> execute() {
+ return Collections.emptySet();
+ }
+
+ @Override
+ public boolean onEntryHit(HashEntry<K, V> e) {
+ return false;
+ }
+
+ @Override
+ public void onEntryMiss(HashEntry<K, V> e) {
+ }
+
+ @Override
+ public void onEntryRemove(HashEntry<K, V> e) {
+ }
+
+ @Override
+ public boolean thresholdExpired() {
+ return false;
+ }
+
+ @Override
+ public Eviction strategy() {
+ return Eviction.NONE;
+ }
+ }
+
+ static final class LRU<K, V> implements EvictionPolicy<K, V> {
+ private final ConcurrentLinkedQueue<HashEntry<K, V>> accessQueue;
+ private final Segment<K,V> segment;
+ private final LinkedList<HashEntry<K, V>> lruQueue;
+ private final int maxBatchQueueSize;
+ private final int trimDownSize;
+ private final float batchThresholdFactor;
+
+ public LRU(Segment<K,V> s, int capacity, float lf, int maxBatchSize, float batchThresholdFactor) {
+ this.segment = s;
+ this.trimDownSize = (int) (capacity * lf);
+ this.maxBatchQueueSize = maxBatchSize > MAX_BATCH_SIZE ? MAX_BATCH_SIZE : maxBatchSize;
+ this.batchThresholdFactor = batchThresholdFactor;
+ this.accessQueue = new ConcurrentLinkedQueue<HashEntry<K, V>>();
+ this.lruQueue = new LinkedList<HashEntry<K, V>>();
+ }
+
+ @Override
+ public Set<HashEntry<K, V>> execute() {
+ Set<HashEntry<K, V>> evicted = Collections.emptySet();
+ if (isOverflow()) {
+ evicted = new HashSet<HashEntry<K, V>>();
+ }
+ try {
+ for (HashEntry<K, V> e : accessQueue) {
+ if (lruQueue.remove(e)) {
+ lruQueue.addFirst(e);
+ }
+ }
+ while (isOverflow()) {
+ HashEntry<K, V> first = lruQueue.getLast();
+ segment.remove(first.key, first.hash, null);
+ evicted.add(first);
+ }
+ } finally {
+ accessQueue.clear();
+ }
+ return evicted;
+ }
+
+ private boolean isOverflow() {
+ return lruQueue.size() > trimDownSize;
+ }
+
+ @Override
+ public void onEntryMiss(HashEntry<K, V> e) {
+ lruQueue.addFirst(e);
+ }
+
+ /*
+ * Invoked without holding a lock on Segment
+ */
+ @Override
+ public boolean onEntryHit(HashEntry<K, V> e) {
+ accessQueue.add(e);
+ return accessQueue.size() >= maxBatchQueueSize * batchThresholdFactor;
+ }
+
+ /*
+ * Invoked without holding a lock on Segment
+ */
+ @Override
+ public boolean thresholdExpired() {
+ return accessQueue.size() >= maxBatchQueueSize;
+ }
+
+ @Override
+ public void onEntryRemove(HashEntry<K, V> e) {
+ lruQueue.remove(e);
+ // we could have multiple instances of e in accessQueue; remove them all
+ while (accessQueue.remove(e));
+ }
+
+ @Override
+ public void clear() {
+ lruQueue.clear();
+ accessQueue.clear();
+ }
+
+ @Override
+ public Eviction strategy() {
+ return Eviction.LRU;
+ }
+ }
+
+ static final class LIRS<K, V> implements EvictionPolicy<K, V> {
+ private final static int MIN_HIR_SIZE = 2;
+ private final Segment<K,V> segment;
+ private final ConcurrentLinkedQueue<HashEntry<K, V>> accessQueue;
+ private final LinkedHashMap<Integer, HashEntry<K, V>> stack;
+ private final LinkedList<HashEntry<K, V>> queue;
+ private final int maxBatchQueueSize;
+ private final int lirSizeLimit;
+ private final int hirSizeLimit;
+ private int currentLIRSize;
+ private final float batchThresholdFactor;
+
+ public LIRS(Segment<K,V> s, int capacity, float lf, int maxBatchSize, float batchThresholdFactor) {
+ this.segment = s;
+ int tmpLirSize = (int) (capacity * 0.9);
+ int tmpHirSizeLimit = capacity - tmpLirSize;
+ if (tmpHirSizeLimit < MIN_HIR_SIZE) {
+ hirSizeLimit = MIN_HIR_SIZE;
+ lirSizeLimit = capacity - hirSizeLimit;
+ } else {
+ hirSizeLimit = tmpHirSizeLimit;
+ lirSizeLimit = tmpLirSize;
+ }
+ this.maxBatchQueueSize = maxBatchSize > MAX_BATCH_SIZE ? MAX_BATCH_SIZE : maxBatchSize;
+ this.batchThresholdFactor = batchThresholdFactor;
+ this.accessQueue = new ConcurrentLinkedQueue<HashEntry<K, V>>();
+ this.stack = new LinkedHashMap<Integer, HashEntry<K, V>>();
+ this.queue = new LinkedList<HashEntry<K, V>>();
+ }
+
+ @Override
+ public Set<HashEntry<K, V>> execute() {
+ Set<HashEntry<K, V>> evicted = new HashSet<HashEntry<K, V>>();
+ try {
+ for (HashEntry<K, V> e : accessQueue) {
+ if (present(e)) {
+ if (e.recency() == Recency.LIR_RESIDENT) {
+ handleLIRHit(e, evicted);
+ } else if (e.recency() == Recency.HIR_RESIDENT) {
+ handleHIRHit(e, evicted);
+ }
+ }
+ }
+ removeFromSegment(evicted);
+ } finally {
+ accessQueue.clear();
+ }
+ return evicted;
+ }
+
+ private void handleHIRHit(HashEntry<K, V> e, Set<HashEntry<K, V>> evicted) {
+ boolean inStack = stack.containsKey(e.hashCode());
+ if (inStack)
+ stack.remove(e.hashCode());
+
+ // first put on top of the stack
+ stack.put(e.hashCode(), e);
+
+ if (inStack) {
+ queue.remove(e);
+ e.transitionToLIRResident();
+ switchBottomostLIRtoHIRAndPrune(evicted);
+ } else {
+ queue.remove(e);
+ queue.addLast(e);
+ }
+ }
+
+ private void handleLIRHit(HashEntry<K, V> e, Set<HashEntry<K, V>> evicted) {
+ stack.remove(e.hashCode());
+ stack.put(e.hashCode(), e);
+ for (Iterator<HashEntry<K, V>> i = stack.values().iterator(); i.hasNext();) {
+ HashEntry<K, V> next = i.next();
+ if (next.recency() == Recency.LIR_RESIDENT) {
+ break;
+ } else {
+ i.remove();
+ evicted.add(next);
+ }
+ }
+ }
+
+ private boolean present(HashEntry<K, V> e) {
+ return stack.containsKey(e.hashCode()) || queue.contains(e);
+ }
+
+ @Override
+ public void onEntryMiss(HashEntry<K, V> e) {
+ // initialization
+ if (currentLIRSize + 1 < lirSizeLimit) {
+ currentLIRSize++;
+ e.transitionToLIRResident();
+ stack.put(e.hashCode(), e);
+ } else {
+ if (queue.size() < hirSizeLimit) {
+ queue.addLast(e);
+ } else {
+ boolean inStack = stack.containsKey(e.hashCode());
+ HashEntry<K, V> first = queue.removeFirst();
+ first.transitionHIRResidentToHIRNonResident();
+
+ stack.put(e.hashCode(), e);
+
+ if (inStack) {
+ e.transitionToLIRResident();
+ Set<HashEntry<K, V>> evicted = new HashSet<HashEntry<K, V>>();
+ switchBottomostLIRtoHIRAndPrune(evicted);
+ removeFromSegment(evicted);
+ } else {
+ queue.addLast(e);
+ }
+
+ // evict from segment
+ segment.remove(first.key, first.hash, null);
+ }
+ }
+ }
+
+ private void removeFromSegment(Set<HashEntry<K, V>> evicted) {
+ for (HashEntry<K, V> e : evicted) {
+ segment.remove(e.key, e.hash, null);
+ }
+ }
+
+ private void switchBottomostLIRtoHIRAndPrune(Set<HashEntry<K, V>> evicted) {
+ boolean seenFirstLIR = false;
+ for (Iterator<HashEntry<K, V>> i = stack.values().iterator(); i.hasNext();) {
+ HashEntry<K, V> next = i.next();
+ if (next.recency() == Recency.LIR_RESIDENT) {
+ if (!seenFirstLIR) {
+ seenFirstLIR = true;
+ i.remove();
+ next.transitionLIRResidentToHIRResident();
+ queue.addLast(next);
+ } else {
+ break;
+ }
+ } else {
+ i.remove();
+ evicted.add(next);
+ }
+ }
+ }
+
+ /*
+ * Invoked without holding a lock on Segment
+ */
+ @Override
+ public boolean onEntryHit(HashEntry<K, V> e) {
+ accessQueue.add(e);
+ return accessQueue.size() >= maxBatchQueueSize * batchThresholdFactor;
+ }
+
+ /*
+ * Invoked without holding a lock on Segment
+ */
+ @Override
+ public boolean thresholdExpired() {
+ return accessQueue.size() >= maxBatchQueueSize;
+ }
+
+ @Override
+ public void onEntryRemove(HashEntry<K, V> e) {
+ HashEntry<K, V> removed = stack.remove(e.hashCode());
+ if (removed != null && removed.recency() == Recency.LIR_RESIDENT) {
+ currentLIRSize--;
+ }
+ queue.remove(e);
+ // we could have multiple instances of e in accessQueue; remove them all
+ while (accessQueue.remove(e));
+ }
+
+ @Override
+ public void clear() {
+ stack.clear();
+ accessQueue.clear();
+ }
+
+ @Override
+ public Eviction strategy() {
+ return Eviction.LIRS;
+ }
+ }
+
+ /**
+ * Segments are specialized versions of hash tables. This
+ * subclasses from ReentrantLock opportunistically, just to
+ * simplify some locking and avoid separate construction.
+ */
+ static final class Segment<K,V> extends ReentrantLock implements Serializable {
+ /*
+ * Segments maintain a table of entry lists that are ALWAYS
+ * kept in a consistent state, so can be read without locking.
+ * Next fields of nodes are immutable (final). All list
+ * additions are performed at the front of each bin. This
+ * makes it easy to check changes, and also fast to traverse.
+ * When nodes would otherwise be changed, new nodes are
+ * created to replace them. This works well for hash tables
+ * since the bin lists tend to be short. (The average length
+ * is less than two for the default load factor threshold.)
+ *
+ * Read operations can thus proceed without locking, but rely
+ * on selected uses of volatiles to ensure that completed
+ * write operations performed by other threads are
+ * noticed. For most purposes, the "count" field, tracking the
+ * number of elements, serves as that volatile variable
+ * ensuring visibility. This is convenient because this field
+ * needs to be read in many read operations anyway:
+ *
+ * - All (unsynchronized) read operations must first read the
+ * "count" field, and should not look at table entries if
+ * it is 0.
+ *
+ * - All (synchronized) write operations should write to
+ * the "count" field after structurally changing any bin.
+ * The operations must not take any action that could even
+ * momentarily cause a concurrent read operation to see
+ * inconsistent data. This is made easier by the nature of
+ * the read operations in Map. For example, no operation
+ * can reveal that the table has grown but the threshold
+ * has not yet been updated, so there are no atomicity
+ * requirements for this with respect to reads.
+ *
+ * As a guide, all critical volatile reads and writes to the
+ * count field are marked in code comments.
+ */
+
+ private static final long serialVersionUID = 2249069246763182397L;
+
+ /**
+ * The number of elements in this segment's region.
+ */
+ transient volatile int count;
+
+ /**
+ * Number of updates that alter the size of the table. This is
+ * used during bulk-read methods to make sure they see a
+ * consistent snapshot: If modCounts change during a traversal
+ * of segments computing size or checking containsValue, then
+ * we might have an inconsistent view of state so (usually)
+ * must retry.
+ */
+ transient int modCount;
+
+ /**
+ * The table is rehashed when its size exceeds this threshold.
+ * (The value of this field is always <tt>(int)(capacity *
+ * loadFactor)</tt>.)
+ */
+ transient int threshold;
+
+ /**
+ * The per-segment table.
+ */
+ transient volatile HashEntry<K,V>[] table;
+
+ /**
+ * The load factor for the hash table. Even though this value
+ * is same for all segments, it is replicated to avoid needing
+ * links to outer object.
+ * @serial
+ */
+ final float loadFactor;
+
+ transient final EvictionPolicy<K, V> eviction;
+
+ transient final EvictionListener<K, V> evictionListener;
+
+ Segment(int cap, float lf, Eviction es, EvictionListener<K, V> listener) {
+ loadFactor = lf;
+ eviction = es.make(this, cap, lf);
+ evictionListener = listener;
+ setTable(HashEntry.<K, V> newArray(cap));
+ }
+
+ @SuppressWarnings("unchecked")
+ static final <K,V> Segment<K,V>[] newArray(int i) {
+ return new Segment[i];
+ }
+
+ /**
+ * Sets table to new HashEntry array.
+ * Call only while holding lock or in constructor.
+ */
+ void setTable(HashEntry<K,V>[] newTable) {
+ threshold = (int)(newTable.length * loadFactor);
+ table = newTable;
+ }
+
+ /**
+ * Returns properly casted first entry of bin for given hash.
+ */
+ HashEntry<K,V> getFirst(int hash) {
+ HashEntry<K,V>[] tab = table;
+ return tab[hash & (tab.length - 1)];
+ }
+
+ /**
+ * Reads value field of an entry under lock. Called if value
+ * field ever appears to be null. This is possible only if a
+ * compiler happens to reorder a HashEntry initialization with
+ * its table assignment, which is legal under memory model
+ * but is not known to ever occur.
+ */
+ V readValueUnderLock(HashEntry<K,V> e) {
+ lock();
+ try {
+ return e.value;
+ } finally {
+ unlock();
+ }
+ }
+
+ /* Specialized implementations of map methods */
+
+ V get(Object key, int hash) {
+ int c = count;
+ if (c != 0) { // read-volatile
+ V result = null;
+ HashEntry<K, V> e = getFirst(hash);
+ loop: while (e != null) {
+ if (e.hash == hash && key.equals(e.key)) {
+ V v = e.value;
+ if (v != null) {
+ result = v;
+ break loop;
+ } else {
+ result = readValueUnderLock(e); // recheck
+ break loop;
+ }
+ }
+ e = e.next;
+ }
+ // a hit
+ if (result != null) {
+ if (eviction.onEntryHit(e)) {
+ Set<HashEntry<K, V>> evicted = attemptEviction(false);
+ // piggyback listener invocation on callers thread outside lock
+ if (evicted != null) {
+ for (HashEntry<K, V> he : evicted) {
+ evictionListener.evicted(he.key, he.value);
+ }
+ }
+ }
+ }
+ return result;
+ }
+ return null;
+ }
+
+ private Set<HashEntry<K, V>> attemptEviction(boolean lockedAlready) {
+ Set<HashEntry<K, V>> evicted = null;
+ boolean obtainedLock = !lockedAlready ? tryLock() : true;
+ if (!obtainedLock && eviction.thresholdExpired()) {
+ lock();
+ obtainedLock = true;
+ }
+ if (obtainedLock) {
+ try {
+ evicted = eviction.execute();
+ } finally {
+ if (!lockedAlready)
+ unlock();
+ }
+ }
+ return evicted;
+ }
+
+ boolean containsKey(Object key, int hash) {
+ if (count != 0) { // read-volatile
+ HashEntry<K,V> e = getFirst(hash);
+ while (e != null) {
+ if (e.hash == hash && key.equals(e.key))
+ return true;
+ e = e.next;
+ }
+ }
+ return false;
+ }
+
+ boolean containsValue(Object value) {
+ if (count != 0) { // read-volatile
+ HashEntry<K,V>[] tab = table;
+ int len = tab.length;
+ for (int i = 0 ; i < len; i++) {
+ for (HashEntry<K,V> e = tab[i]; e != null; e = e.next) {
+ V v = e.value;
+ if (v == null) // recheck
+ v = readValueUnderLock(e);
+ if (value.equals(v))
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ boolean replace(K key, int hash, V oldValue, V newValue) {
+ lock();
+ Set<HashEntry<K, V>> evicted = null;
+ try {
+ HashEntry<K, V> e = getFirst(hash);
+ while (e != null && (e.hash != hash || !key.equals(e.key)))
+ e = e.next;
+
+ boolean replaced = false;
+ if (e != null && oldValue.equals(e.value)) {
+ replaced = true;
+ e.value = newValue;
+ if (eviction.onEntryHit(e)) {
+ evicted = attemptEviction(true);
+ }
+ }
+ return replaced;
+ } finally {
+ unlock();
+ // piggyback listener invocation on callers thread outside lock
+ if (evicted != null) {
+ for (HashEntry<K, V> he : evicted) {
+ evictionListener.evicted(he.key, he.value);
+ }
+ }
+ }
+ }
+
+ V replace(K key, int hash, V newValue) {
+ lock();
+ Set<HashEntry<K, V>> evicted = null;
+ try {
+ HashEntry<K, V> e = getFirst(hash);
+ while (e != null && (e.hash != hash || !key.equals(e.key)))
+ e = e.next;
+
+ V oldValue = null;
+ if (e != null) {
+ oldValue = e.value;
+ e.value = newValue;
+ if (eviction.onEntryHit(e)) {
+ evicted = attemptEviction(true);
+ }
+ }
+ return oldValue;
+ } finally {
+ unlock();
+ // piggyback listener invocation on callers thread outside lock
+ if(evicted != null) {
+ for (HashEntry<K, V> he : evicted) {
+ evictionListener.evicted(he.key, he.value);
+ }
+ }
+ }
+ }
+
+
+ V put(K key, int hash, V value, boolean onlyIfAbsent) {
+ lock();
+ Set<HashEntry<K, V>> evicted = null;
+ try {
+ int c = count;
+ if (c++ > threshold && eviction.strategy() == Eviction.NONE) // ensure capacity
+ rehash();
+ HashEntry<K, V>[] tab = table;
+ int index = hash & (tab.length - 1);
+ HashEntry<K, V> first = tab[index];
+ HashEntry<K, V> e = first;
+ while (e != null && (e.hash != hash || !key.equals(e.key)))
+ e = e.next;
+
+ V oldValue;
+ if (e != null) {
+ oldValue = e.value;
+ if (!onlyIfAbsent) {
+ e.value = value;
+ eviction.onEntryHit(e);
+ }
+ } else {
+ oldValue = null;
+ ++modCount;
+ count = c; // write-volatile
+ if (eviction.strategy() != Eviction.NONE) {
+ if (c > tab.length) {
+ // remove entries;lower count
+ evicted = eviction.execute();
+ // re-read first
+ first = tab[index];
+ }
+ // add a new entry
+ tab[index] = new HashEntry<K, V>(key, hash, first, value);
+ // notify a miss
+ eviction.onEntryMiss(tab[index]);
+ } else {
+ tab[index] = new HashEntry<K, V>(key, hash, first, value);
+ }
+ }
+ return oldValue;
+ } finally {
+ unlock();
+ // piggyback listener invocation on callers thread outside lock
+ if(evicted != null) {
+ for (HashEntry<K, V> he : evicted) {
+ evictionListener.evicted(he.key, he.value);
+ }
+ }
+ }
+ }
+
+
+ void rehash() {
+ HashEntry<K,V>[] oldTable = table;
+ int oldCapacity = oldTable.length;
+ if (oldCapacity >= MAXIMUM_CAPACITY)
+ return;
+
+ /*
+ * Reclassify nodes in each list to new Map. Because we are
+ * using power-of-two expansion, the elements from each bin
+ * must either stay at same index, or move with a power of two
+ * offset. We eliminate unnecessary node creation by catching
+ * cases where old nodes can be reused because their next
+ * fields won't change. Statistically, at the default
+ * threshold, only about one-sixth of them need cloning when
+ * a table doubles. The nodes they replace will be garbage
+ * collectable as soon as they are no longer referenced by any
+ * reader thread that may be in the midst of traversing table
+ * right now.
+ */
+
+ HashEntry<K,V>[] newTable = HashEntry.newArray(oldCapacity<<1);
+ threshold = (int)(newTable.length * loadFactor);
+ int sizeMask = newTable.length - 1;
+ for (int i = 0; i < oldCapacity ; i++) {
+ // We need to guarantee that any existing reads of old Map can
+ // proceed. So we cannot yet null out each bin.
+ HashEntry<K,V> e = oldTable[i];
+
+ if (e != null) {
+ HashEntry<K,V> next = e.next;
+ int idx = e.hash & sizeMask;
+
+ // Single node on list
+ if (next == null)
+ newTable[idx] = e;
+
+ else {
+ // Reuse trailing consecutive sequence at same slot
+ HashEntry<K,V> lastRun = e;
+ int lastIdx = idx;
+ for (HashEntry<K,V> last = next;
+ last != null;
+ last = last.next) {
+ int k = last.hash & sizeMask;
+ if (k != lastIdx) {
+ lastIdx = k;
+ lastRun = last;
+ }
+ }
+ newTable[lastIdx] = lastRun;
+
+ // Clone all remaining nodes
+ for (HashEntry<K,V> p = e; p != lastRun; p = p.next) {
+ int k = p.hash & sizeMask;
+ HashEntry<K,V> n = newTable[k];
+ newTable[k] = new HashEntry<K,V>(p.key, p.hash,
+ n, p.value);
+ }
+ }
+ }
+ }
+ table = newTable;
+ }
+
+ /**
+ * Remove; match on key only if value null, else match both.
+ */
+ V remove(Object key, int hash, Object value) {
+ lock();
+ try {
+ int c = count - 1;
+ HashEntry<K, V>[] tab = table;
+ int index = hash & (tab.length - 1);
+ HashEntry<K, V> first = tab[index];
+ HashEntry<K, V> e = first;
+ while (e != null && (e.hash != hash || !key.equals(e.key)))
+ e = e.next;
+
+ V oldValue = null;
+ if (e != null) {
+ V v = e.value;
+ if (value == null || value.equals(v)) {
+ oldValue = v;
+ // All entries following removed node can stay
+ // in list, but all preceding ones need to be
+ // cloned.
+ ++modCount;
+
+ // e was removed
+ eviction.onEntryRemove(e);
+
+ HashEntry<K, V> newFirst = e.next;
+ for (HashEntry<K, V> p = first; p != e; p = p.next) {
+ // allow p to be GC-ed
+ eviction.onEntryRemove(p);
+ newFirst = new HashEntry<K, V>(p.key, p.hash, newFirst, p.value);
+ // and notify eviction algorithm about new hash entries
+ eviction.onEntryMiss(newFirst);
+ }
+
+ tab[index] = newFirst;
+ count = c; // write-volatile
+ }
+ }
+ return oldValue;
+ } finally {
+ unlock();
+ }
+ }
+
+ void clear() {
+ if (count != 0) {
+ lock();
+ try {
+ HashEntry<K, V>[] tab = table;
+ for (int i = 0; i < tab.length; i++)
+ tab[i] = null;
+ ++modCount;
+ eviction.clear();
+ count = 0; // write-volatile
+ } finally {
+ unlock();
+ }
+ }
+ }
+ }
+
+
+
+ /* ---------------- Public operations -------------- */
+
+
+ /**
+ * Creates a new, empty map with the specified maximum capacity, load factor and concurrency
+ * level.
+ *
+ * @param capacity
+ * is the upper bound capacity for the number of elements in this map
+ *
+ * @param concurrencyLevel
+ * the estimated number of concurrently updating threads. The implementation performs
+ * internal sizing to try to accommodate this many threads.
+ *
+ * @param evictionStrategy
+ * the algorithm used to evict elements from this map
+ *
+ * @param evictionListener
+ * the evicton listener callback to be notified about evicted elements
+ *
+ * @throws IllegalArgumentException
+ * if the initial capacity is negative or the load factor or concurrencyLevel are
+ * nonpositive.
+ */
+ public BoundedConcurrentHashMap(int capacity, int concurrencyLevel,
+ Eviction evictionStrategy, EvictionListener<K, V> evictionListener) {
+ if (capacity < 0 || concurrencyLevel <= 0)
+ throw new IllegalArgumentException();
+
+ if (evictionStrategy == null || evictionListener == null)
+ throw new IllegalArgumentException();
+
+ if (concurrencyLevel > MAX_SEGMENTS)
+ concurrencyLevel = MAX_SEGMENTS;
+
+ // Find power-of-two sizes best matching arguments
+ int sshift = 0;
+ int ssize = 1;
+ while (ssize < concurrencyLevel) {
+ ++sshift;
+ ssize <<= 1;
+ }
+ segmentShift = 32 - sshift;
+ segmentMask = ssize - 1;
+ this.segments = Segment.newArray(ssize);
+
+ if (capacity > MAXIMUM_CAPACITY)
+ capacity = MAXIMUM_CAPACITY;
+ int c = capacity / ssize;
+ if (c * ssize < capacity)
+ ++c;
+ int cap = 1;
+ while (cap < c)
+ cap <<= 1;
+
+ for (int i = 0; i < this.segments.length; ++i)
+ this.segments[i] = new Segment<K, V>(cap, DEFAULT_LOAD_FACTOR, evictionStrategy,
+ evictionListener);
+ }
+
+ /**
+ * Creates a new, empty map with the specified maximum capacity, load factor, concurrency
+ * level and LRU eviction policy.
+ *
+ * @param capacity
+ * is the upper bound capacity for the number of elements in this map
+ *
+ * @param concurrencyLevel
+ * the estimated number of concurrently updating threads. The implementation performs
+ * internal sizing to try to accommodate this many threads.
+ *
+ * @throws IllegalArgumentException
+ * if the initial capacity is negative or the load factor or concurrencyLevel are
+ * nonpositive.
+ */
+ public BoundedConcurrentHashMap(int capacity, int concurrencyLevel) {
+ this(capacity, concurrencyLevel, Eviction.LRU);
+ }
+
+ /**
+ * Creates a new, empty map with the specified maximum capacity, load factor, concurrency
+ * level and eviction strategy.
+ *
+ * @param capacity
+ * is the upper bound capacity for the number of elements in this map
+ *
+ * @param concurrencyLevel
+ * the estimated number of concurrently updating threads. The implementation performs
+ * internal sizing to try to accommodate this many threads.
+ *
+ * @param evictionStrategy
+ * the algorithm used to evict elements from this map
+ *
+ * @throws IllegalArgumentException
+ * if the initial capacity is negative or the load factor or concurrencyLevel are
+ * nonpositive.
+ */
+ public BoundedConcurrentHashMap(int capacity, int concurrencyLevel, Eviction evictionStrategy) {
+ this(capacity, concurrencyLevel, evictionStrategy, new NullEvictionListener<K, V>());
+ }
+
+ /**
+ * Creates a new, empty map with the specified maximum capacity, default concurrency
+ * level and LRU eviction policy.
+ *
+ * @param capacity
+ * is the upper bound capacity for the number of elements in this map
+ *
+ *
+ * @throws IllegalArgumentException if the initial capacity of
+ * elements is negative or the load factor is nonpositive
+ *
+ * @since 1.6
+ */
+ public BoundedConcurrentHashMap(int capacity) {
+ this(capacity, DEFAULT_CONCURRENCY_LEVEL);
+ }
+
+ /**
+ * Creates a new, empty map with the default maximum capacity
+ */
+ public BoundedConcurrentHashMap() {
+ this(DEFAULT_MAXIMUM_CAPACITY, DEFAULT_CONCURRENCY_LEVEL);
+ }
+
+ /**
+ * Returns <tt>true</tt> if this map contains no key-value mappings.
+ *
+ * @return <tt>true</tt> if this map contains no key-value mappings
+ */
+ public boolean isEmpty() {
+ final Segment<K,V>[] segments = this.segments;
+ /*
+ * We keep track of per-segment modCounts to avoid ABA
+ * problems in which an element in one segment was added and
+ * in another removed during traversal, in which case the
+ * table was never actually empty at any point. Note the
+ * similar use of modCounts in the size() and containsValue()
+ * methods, which are the only other methods also susceptible
+ * to ABA problems.
+ */
+ int[] mc = new int[segments.length];
+ int mcsum = 0;
+ for (int i = 0; i < segments.length; ++i) {
+ if (segments[i].count != 0)
+ return false;
+ else
+ mcsum += mc[i] = segments[i].modCount;
+ }
+ // If mcsum happens to be zero, then we know we got a snapshot
+ // before any modifications at all were made. This is
+ // probably common enough to bother tracking.
+ if (mcsum != 0) {
+ for (int i = 0; i < segments.length; ++i) {
+ if (segments[i].count != 0 ||
+ mc[i] != segments[i].modCount)
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Returns the number of key-value mappings in this map. If the
+ * map contains more than <tt>Integer.MAX_VALUE</tt> elements, returns
+ * <tt>Integer.MAX_VALUE</tt>.
+ *
+ * @return the number of key-value mappings in this map
+ */
+ public int size() {
+ final Segment<K,V>[] segments = this.segments;
+ long sum = 0;
+ long check = 0;
+ int[] mc = new int[segments.length];
+ // Try a few times to get accurate count. On failure due to
+ // continuous async changes in table, resort to locking.
+ for (int k = 0; k < RETRIES_BEFORE_LOCK; ++k) {
+ check = 0;
+ sum = 0;
+ int mcsum = 0;
+ for (int i = 0; i < segments.length; ++i) {
+ sum += segments[i].count;
+ mcsum += mc[i] = segments[i].modCount;
+ }
+ if (mcsum != 0) {
+ for (int i = 0; i < segments.length; ++i) {
+ check += segments[i].count;
+ if (mc[i] != segments[i].modCount) {
+ check = -1; // force retry
+ break;
+ }
+ }
+ }
+ if (check == sum)
+ break;
+ }
+ if (check != sum) { // Resort to locking all segments
+ sum = 0;
+ for (int i = 0; i < segments.length; ++i)
+ segments[i].lock();
+ for (int i = 0; i < segments.length; ++i)
+ sum += segments[i].count;
+ for (int i = 0; i < segments.length; ++i)
+ segments[i].unlock();
+ }
+ if (sum > Integer.MAX_VALUE)
+ return Integer.MAX_VALUE;
+ else
+ return (int)sum;
+ }
+
+ /**
+ * Returns the value to which the specified key is mapped,
+ * or {@code null} if this map contains no mapping for the key.
+ *
+ * <p>More formally, if this map contains a mapping from a key
+ * {@code k} to a value {@code v} such that {@code key.equals(k)},
+ * then this method returns {@code v}; otherwise it returns
+ * {@code null}. (There can be at most one such mapping.)
+ *
+ * @throws NullPointerException if the specified key is null
+ */
+ public V get(Object key) {
+ int hash = hash(key.hashCode());
+ return segmentFor(hash).get(key, hash);
+ }
+
+ /**
+ * Tests if the specified object is a key in this table.
+ *
+ * @param key possible key
+ * @return <tt>true</tt> if and only if the specified object
+ * is a key in this table, as determined by the
+ * <tt>equals</tt> method; <tt>false</tt> otherwise.
+ * @throws NullPointerException if the specified key is null
+ */
+ public boolean containsKey(Object key) {
+ int hash = hash(key.hashCode());
+ return segmentFor(hash).containsKey(key, hash);
+ }
+
+ /**
+ * Returns <tt>true</tt> if this map maps one or more keys to the
+ * specified value. Note: This method requires a full internal
+ * traversal of the hash table, and so is much slower than
+ * method <tt>containsKey</tt>.
+ *
+ * @param value value whose presence in this map is to be tested
+ * @return <tt>true</tt> if this map maps one or more keys to the
+ * specified value
+ * @throws NullPointerException if the specified value is null
+ */
+ public boolean containsValue(Object value) {
+ if (value == null)
+ throw new NullPointerException();
+
+ // See explanation of modCount use above
+
+ final Segment<K,V>[] segments = this.segments;
+ int[] mc = new int[segments.length];
+
+ // Try a few times without locking
+ for (int k = 0; k < RETRIES_BEFORE_LOCK; ++k) {
+ int sum = 0;
+ int mcsum = 0;
+ for (int i = 0; i < segments.length; ++i) {
+ int c = segments[i].count;
+ mcsum += mc[i] = segments[i].modCount;
+ if (segments[i].containsValue(value))
+ return true;
+ }
+ boolean cleanSweep = true;
+ if (mcsum != 0) {
+ for (int i = 0; i < segments.length; ++i) {
+ int c = segments[i].count;
+ if (mc[i] != segments[i].modCount) {
+ cleanSweep = false;
+ break;
+ }
+ }
+ }
+ if (cleanSweep)
+ return false;
+ }
+ // Resort to locking all segments
+ for (int i = 0; i < segments.length; ++i)
+ segments[i].lock();
+ boolean found = false;
+ try {
+ for (int i = 0; i < segments.length; ++i) {
+ if (segments[i].containsValue(value)) {
+ found = true;
+ break;
+ }
+ }
+ } finally {
+ for (int i = 0; i < segments.length; ++i)
+ segments[i].unlock();
+ }
+ return found;
+ }
+
+ /**
+ * Legacy method testing if some key maps into the specified value
+ * in this table. This method is identical in functionality to
+ * {@link #containsValue}, and exists solely to ensure
+ * full compatibility with class {@link java.util.Hashtable},
+ * which supported this method prior to introduction of the
+ * Java Collections framework.
+
+ * @param value a value to search for
+ * @return <tt>true</tt> if and only if some key maps to the
+ * <tt>value</tt> argument in this table as
+ * determined by the <tt>equals</tt> method;
+ * <tt>false</tt> otherwise
+ * @throws NullPointerException if the specified value is null
+ */
+ public boolean contains(Object value) {
+ return containsValue(value);
+ }
+
+ /**
+ * Maps the specified key to the specified value in this table.
+ * Neither the key nor the value can be null.
+ *
+ * <p> The value can be retrieved by calling the <tt>get</tt> method
+ * with a key that is equal to the original key.
+ *
+ * @param key key with which the specified value is to be associated
+ * @param value value to be associated with the specified key
+ * @return the previous value associated with <tt>key</tt>, or
+ * <tt>null</tt> if there was no mapping for <tt>key</tt>
+ * @throws NullPointerException if the specified key or value is null
+ */
+ public V put(K key, V value) {
+ if (value == null)
+ throw new NullPointerException();
+ int hash = hash(key.hashCode());
+ return segmentFor(hash).put(key, hash, value, false);
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * @return the previous value associated with the specified key,
+ * or <tt>null</tt> if there was no mapping for the key
+ * @throws NullPointerException if the specified key or value is null
+ */
+ public V putIfAbsent(K key, V value) {
+ if (value == null)
+ throw new NullPointerException();
+ int hash = hash(key.hashCode());
+ return segmentFor(hash).put(key, hash, value, true);
+ }
+
+ /**
+ * Copies all of the mappings from the specified map to this one.
+ * These mappings replace any mappings that this map had for any of the
+ * keys currently in the specified map.
+ *
+ * @param m mappings to be stored in this map
+ */
+ public void putAll(Map<? extends K, ? extends V> m) {
+ for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
+ put(e.getKey(), e.getValue());
+ }
+
+ /**
+ * Removes the key (and its corresponding value) from this map.
+ * This method does nothing if the key is not in the map.
+ *
+ * @param key the key that needs to be removed
+ * @return the previous value associated with <tt>key</tt>, or
+ * <tt>null</tt> if there was no mapping for <tt>key</tt>
+ * @throws NullPointerException if the specified key is null
+ */
+ public V remove(Object key) {
+ int hash = hash(key.hashCode());
+ return segmentFor(hash).remove(key, hash, null);
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * @throws NullPointerException if the specified key is null
+ */
+ public boolean remove(Object key, Object value) {
+ int hash = hash(key.hashCode());
+ if (value == null)
+ return false;
+ return segmentFor(hash).remove(key, hash, value) != null;
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * @throws NullPointerException if any of the arguments are null
+ */
+ public boolean replace(K key, V oldValue, V newValue) {
+ if (oldValue == null || newValue == null)
+ throw new NullPointerException();
+ int hash = hash(key.hashCode());
+ return segmentFor(hash).replace(key, hash, oldValue, newValue);
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * @return the previous value associated with the specified key,
+ * or <tt>null</tt> if there was no mapping for the key
+ * @throws NullPointerException if the specified key or value is null
+ */
+ public V replace(K key, V value) {
+ if (value == null)
+ throw new NullPointerException();
+ int hash = hash(key.hashCode());
+ return segmentFor(hash).replace(key, hash, value);
+ }
+
+ /**
+ * Removes all of the mappings from this map.
+ */
+ public void clear() {
+ for (int i = 0; i < segments.length; ++i)
+ segments[i].clear();
+ }
+
+ /**
+ * Returns a {@link Set} view of the keys contained in this map.
+ * The set is backed by the map, so changes to the map are
+ * reflected in the set, and vice-versa. The set supports element
+ * removal, which removes the corresponding mapping from this map,
+ * via the <tt>Iterator.remove</tt>, <tt>Set.remove</tt>,
+ * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt>
+ * operations. It does not support the <tt>add</tt> or
+ * <tt>addAll</tt> operations.
+ *
+ * <p>The view's <tt>iterator</tt> is a "weakly consistent" iterator
+ * that will never throw {@link ConcurrentModificationException},
+ * and guarantees to traverse elements as they existed upon
+ * construction of the iterator, and may (but is not guaranteed to)
+ * reflect any modifications subsequent to construction.
+ */
+ public Set<K> keySet() {
+ Set<K> ks = keySet;
+ return (ks != null) ? ks : (keySet = new KeySet());
+ }
+
+ /**
+ * Returns a {@link Collection} view of the values contained in this map.
+ * The collection is backed by the map, so changes to the map are
+ * reflected in the collection, and vice-versa. The collection
+ * supports element removal, which removes the corresponding
+ * mapping from this map, via the <tt>Iterator.remove</tt>,
+ * <tt>Collection.remove</tt>, <tt>removeAll</tt>,
+ * <tt>retainAll</tt>, and <tt>clear</tt> operations. It does not
+ * support the <tt>add</tt> or <tt>addAll</tt> operations.
+ *
+ * <p>The view's <tt>iterator</tt> is a "weakly consistent" iterator
+ * that will never throw {@link ConcurrentModificationException},
+ * and guarantees to traverse elements as they existed upon
+ * construction of the iterator, and may (but is not guaranteed to)
+ * reflect any modifications subsequent to construction.
+ */
+ public Collection<V> values() {
+ Collection<V> vs = values;
+ return (vs != null) ? vs : (values = new Values());
+ }
+
+ /**
+ * Returns a {@link Set} view of the mappings contained in this map.
+ * The set is backed by the map, so changes to the map are
+ * reflected in the set, and vice-versa. The set supports element
+ * removal, which removes the corresponding mapping from the map,
+ * via the <tt>Iterator.remove</tt>, <tt>Set.remove</tt>,
+ * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt>
+ * operations. It does not support the <tt>add</tt> or
+ * <tt>addAll</tt> operations.
+ *
+ * <p>The view's <tt>iterator</tt> is a "weakly consistent" iterator
+ * that will never throw {@link ConcurrentModificationException},
+ * and guarantees to traverse elements as they existed upon
+ * construction of the iterator, and may (but is not guaranteed to)
+ * reflect any modifications subsequent to construction.
+ */
+ public Set<Map.Entry<K,V>> entrySet() {
+ Set<Map.Entry<K,V>> es = entrySet;
+ return (es != null) ? es : (entrySet = new EntrySet());
+ }
+
+ /**
+ * Returns an enumeration of the keys in this table.
+ *
+ * @return an enumeration of the keys in this table
+ * @see #keySet()
+ */
+ public Enumeration<K> keys() {
+ return new KeyIterator();
+ }
+
+ /**
+ * Returns an enumeration of the values in this table.
+ *
+ * @return an enumeration of the values in this table
+ * @see #values()
+ */
+ public Enumeration<V> elements() {
+ return new ValueIterator();
+ }
+
+ /* ---------------- Iterator Support -------------- */
+
+ abstract class HashIterator {
+ int nextSegmentIndex;
+ int nextTableIndex;
+ HashEntry<K,V>[] currentTable;
+ HashEntry<K, V> nextEntry;
+ HashEntry<K, V> lastReturned;
+
+ HashIterator() {
+ nextSegmentIndex = segments.length - 1;
+ nextTableIndex = -1;
+ advance();
+ }
+
+ public boolean hasMoreElements() { return hasNext(); }
+
+ final void advance() {
+ if (nextEntry != null && (nextEntry = nextEntry.next) != null)
+ return;
+
+ while (nextTableIndex >= 0) {
+ if ( (nextEntry = currentTable[nextTableIndex--]) != null)
+ return;
+ }
+
+ while (nextSegmentIndex >= 0) {
+ Segment<K,V> seg = segments[nextSegmentIndex--];
+ if (seg.count != 0) {
+ currentTable = seg.table;
+ for (int j = currentTable.length - 1; j >= 0; --j) {
+ if ( (nextEntry = currentTable[j]) != null) {
+ nextTableIndex = j - 1;
+ return;
+ }
+ }
+ }
+ }
+ }
+
+ public boolean hasNext() { return nextEntry != null; }
+
+ HashEntry<K,V> nextEntry() {
+ if (nextEntry == null)
+ throw new NoSuchElementException();
+ lastReturned = nextEntry;
+ advance();
+ return lastReturned;
+ }
+
+ public void remove() {
+ if (lastReturned == null)
+ throw new IllegalStateException();
+ BoundedConcurrentHashMap.this.remove(lastReturned.key);
+ lastReturned = null;
+ }
+ }
+
+ final class KeyIterator
+ extends HashIterator
+ implements Iterator<K>, Enumeration<K>
+ {
+ public K next() { return super.nextEntry().key; }
+ public K nextElement() { return super.nextEntry().key; }
+ }
+
+ final class ValueIterator
+ extends HashIterator
+ implements Iterator<V>, Enumeration<V>
+ {
+ public V next() { return super.nextEntry().value; }
+ public V nextElement() { return super.nextEntry().value; }
+ }
+
+ /**
+ * Custom Entry class used by EntryIterator.next(), that relays
+ * setValue changes to the underlying map.
+ */
+ final class WriteThroughEntry
+ extends AbstractMap.SimpleEntry<K,V>
+ {
+ WriteThroughEntry(K k, V v) {
+ super(k,v);
+ }
+
+ /**
+ * Set our entry's value and write through to the map. The
+ * value to return is somewhat arbitrary here. Since a
+ * WriteThroughEntry does not necessarily track asynchronous
+ * changes, the most recent "previous" value could be
+ * different from what we return (or could even have been
+ * removed in which case the put will re-establish). We do not
+ * and cannot guarantee more.
+ */
+ public V setValue(V value) {
+ if (value == null) throw new NullPointerException();
+ V v = super.setValue(value);
+ BoundedConcurrentHashMap.this.put(getKey(), value);
+ return v;
+ }
+ }
+
+ final class EntryIterator
+ extends HashIterator
+ implements Iterator<Entry<K,V>>
+ {
+ public Map.Entry<K,V> next() {
+ HashEntry<K,V> e = super.nextEntry();
+ return new WriteThroughEntry(e.key, e.value);
+ }
+ }
+
+ final class KeySet extends AbstractSet<K> {
+ public Iterator<K> iterator() {
+ return new KeyIterator();
+ }
+ public int size() {
+ return BoundedConcurrentHashMap.this.size();
+ }
+ public boolean isEmpty() {
+ return BoundedConcurrentHashMap.this.isEmpty();
+ }
+ public boolean contains(Object o) {
+ return BoundedConcurrentHashMap.this.containsKey(o);
+ }
+ public boolean remove(Object o) {
+ return BoundedConcurrentHashMap.this.remove(o) != null;
+ }
+ public void clear() {
+ BoundedConcurrentHashMap.this.clear();
+ }
+ }
+
+ final class Values extends AbstractCollection<V> {
+ public Iterator<V> iterator() {
+ return new ValueIterator();
+ }
+ public int size() {
+ return BoundedConcurrentHashMap.this.size();
+ }
+ public boolean isEmpty() {
+ return BoundedConcurrentHashMap.this.isEmpty();
+ }
+ public boolean contains(Object o) {
+ return BoundedConcurrentHashMap.this.containsValue(o);
+ }
+ public void clear() {
+ BoundedConcurrentHashMap.this.clear();
+ }
+ }
+
+ final class EntrySet extends AbstractSet<Map.Entry<K,V>> {
+ public Iterator<Map.Entry<K,V>> iterator() {
+ return new EntryIterator();
+ }
+ public boolean contains(Object o) {
+ if (!(o instanceof Map.Entry))
+ return false;
+ Map.Entry<?,?> e = (Map.Entry<?,?>)o;
+ V v = BoundedConcurrentHashMap.this.get(e.getKey());
+ return v != null && v.equals(e.getValue());
+ }
+ public boolean remove(Object o) {
+ if (!(o instanceof Map.Entry))
+ return false;
+ Map.Entry<?,?> e = (Map.Entry<?,?>)o;
+ return BoundedConcurrentHashMap.this.remove(e.getKey(), e.getValue());
+ }
+ public int size() {
+ return BoundedConcurrentHashMap.this.size();
+ }
+ public boolean isEmpty() {
+ return BoundedConcurrentHashMap.this.isEmpty();
+ }
+ public void clear() {
+ BoundedConcurrentHashMap.this.clear();
+ }
+ }
+
+ /* ---------------- Serialization Support -------------- */
+
+ /**
+ * Save the state of the <tt>ConcurrentHashMap</tt> instance to a
+ * stream (i.e., serialize it).
+ * @param s the stream
+ * @serialData
+ * the key (Object) and value (Object)
+ * for each key-value mapping, followed by a null pair.
+ * The key-value mappings are emitted in no particular order.
+ */
+ private void writeObject(java.io.ObjectOutputStream s) throws IOException {
+ s.defaultWriteObject();
+
+ for (int k = 0; k < segments.length; ++k) {
+ Segment<K,V> seg = segments[k];
+ seg.lock();
+ try {
+ HashEntry<K,V>[] tab = seg.table;
+ for (int i = 0; i < tab.length; ++i) {
+ for (HashEntry<K,V> e = tab[i]; e != null; e = e.next) {
+ s.writeObject(e.key);
+ s.writeObject(e.value);
+ }
+ }
+ } finally {
+ seg.unlock();
+ }
+ }
+ s.writeObject(null);
+ s.writeObject(null);
+ }
+
+ /**
+ * Reconstitute the <tt>ConcurrentHashMap</tt> instance from a
+ * stream (i.e., deserialize it).
+ * @param s the stream
+ */
+ private void readObject(java.io.ObjectInputStream s)
+ throws IOException, ClassNotFoundException {
+ s.defaultReadObject();
+
+ // Initialize each segment to be minimally sized, and let grow.
+ for (int i = 0; i < segments.length; ++i) {
+ segments[i].setTable(new HashEntry[1]);
+ }
+
+ // Read the keys and values, and put the mappings in the table
+ for (;;) {
+ K key = (K) s.readObject();
+ V value = (V) s.readObject();
+ if (key == null)
+ break;
+ put(key, value);
+ }
+ }
+}
\ No newline at end of file
Deleted: trunk/core/src/main/java/org/infinispan/util/concurrent/BufferedConcurrentHashMap.java
===================================================================
--- trunk/core/src/main/java/org/infinispan/util/concurrent/BufferedConcurrentHashMap.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/java/org/infinispan/util/concurrent/BufferedConcurrentHashMap.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -1,1842 +0,0 @@
-/*
- * Written by Doug Lea with assistance from members of JCP JSR-166
- * Expert Group and released to the public domain, as explained at
- * http://creativecommons.org/licenses/publicdomain
- *
- *
- * Modified by Vladimir Blagojevic to include lock amortized eviction.
- * For more details see http://www.cse.ohio-state.edu/hpcs/WWW/HTML/publications/papers/TR-09-1.pdf
- * https://jira.jboss.org/jira/browse/ISPN-299
- *
- */
-
-package org.infinispan.util.concurrent;
-
-import java.io.IOException;
-import java.io.Serializable;
-import java.util.AbstractCollection;
-import java.util.AbstractMap;
-import java.util.AbstractSet;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.ConcurrentModificationException;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Hashtable;
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.LinkedList;
-import java.util.Map;
-import java.util.NoSuchElementException;
-import java.util.Set;
-import java.util.concurrent.ConcurrentLinkedQueue;
-import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.locks.ReentrantLock;
-
-/**
- * A hash table supporting full concurrency of retrievals and adjustable expected concurrency for
- * updates. This class obeys the same functional specification as {@link java.util.Hashtable}, and
- * includes versions of methods corresponding to each method of <tt>Hashtable</tt>. However, even
- * though all operations are thread-safe, retrieval operations do <em>not</em> entail locking, and
- * there is <em>not</em> any support for locking the entire table in a way that prevents all access.
- * This class is fully interoperable with <tt>Hashtable</tt> in programs that rely on its thread
- * safety but not on its synchronization details.
- *
- * <p>
- * Retrieval operations (including <tt>get</tt>) generally do not block, so may overlap with update
- * operations (including <tt>put</tt> and <tt>remove</tt>). Retrievals reflect the results of the
- * most recently <em>completed</em> update operations holding upon their onset. For aggregate
- * operations such as <tt>putAll</tt> and <tt>clear</tt>, concurrent retrievals may reflect
- * insertion or removal of only some entries. Similarly, Iterators and Enumerations return elements
- * reflecting the state of the hash table at some point at or since the creation of the
- * iterator/enumeration. They do <em>not</em> throw {@link ConcurrentModificationException}.
- * However, iterators are designed to be used by only one thread at a time.
- *
- * <p>
- * The allowed concurrency among update operations is guided by the optional
- * <tt>concurrencyLevel</tt> constructor argument (default <tt>16</tt>), which is used as a hint for
- * internal sizing. The table is internally partitioned to try to permit the indicated number of
- * concurrent updates without contention. Because placement in hash tables is essentially random,
- * the actual concurrency will vary. Ideally, you should choose a value to accommodate as many
- * threads as will ever concurrently modify the table. Using a significantly higher value than you
- * need can waste space and time, and a significantly lower value can lead to thread contention. But
- * overestimates and underestimates within an order of magnitude do not usually have much noticeable
- * impact. A value of one is appropriate when it is known that only one thread will modify and all
- * others will only read. Also, resizing this or any other kind of hash table is a relatively slow
- * operation, so, when possible, it is a good idea to provide estimates of expected table sizes in
- * constructors.
- *
- * <p>
- * This class and its views and iterators implement all of the <em>optional</em> methods of the
- * {@link Map} and {@link Iterator} interfaces.
- *
- * <p>
- * Like {@link Hashtable} but unlike {@link HashMap}, this class does <em>not</em> allow
- * <tt>null</tt> to be used as a key or value.
- *
- * <p>
- * This class is a member of the <a href="{@docRoot}/../technotes/guides/collections/index.html">
- * Java Collections Framework</a>.
- *
- * @since 1.5
- * @author Doug Lea
- * @param <K>
- * the type of keys maintained by this map
- * @param <V>
- * the type of mapped values
- */
-public class BufferedConcurrentHashMap<K, V> extends AbstractMap<K, V> implements
- ConcurrentMap<K, V>, Serializable {
- private static final long serialVersionUID = 7249069246763182397L;
-
- /*
- * The basic strategy is to subdivide the table among Segments, each of which itself is a
- * concurrently readable hash table.
- */
-
- /* ---------------- Constants -------------- */
- /**
- * The default initial capacity for this table, used when not otherwise specified in a
- * constructor.
- */
- static final int DEFAULT_INITIAL_CAPACITY = 16;
-
- /**
- * The default load factor for this table, used when not otherwise specified in a constructor.
- */
- static final float DEFAULT_LOAD_FACTOR = 0.75f;
-
- /**
- * The default concurrency level for this table, used when not otherwise specified in a
- * constructor.
- */
- static final int DEFAULT_CONCURRENCY_LEVEL = 16;
-
- /**
- * The maximum capacity, used if a higher value is implicitly specified by either of the
- * constructors with arguments. MUST be a power of two <= 1<<30 to ensure that entries are
- * indexable using ints.
- */
- static final int MAXIMUM_CAPACITY = 1 << 30;
-
- /**
- * The maximum number of segments to allow; used to bound constructor arguments.
- */
- static final int MAX_SEGMENTS = 1 << 16; // slightly conservative
-
- /**
- * Number of unsynchronized retries in size and containsValue methods before resorting to
- * locking. This is used to avoid unbounded retries if tables undergo continuous modification
- * which would make it impossible to obtain an accurate result.
- */
- static final int RETRIES_BEFORE_LOCK = 2;
-
- /* ---------------- Fields -------------- */
-
- /**
- * Mask value for indexing into segments. The upper bits of a key's hash code are used to choose
- * the segment.
- */
- final int segmentMask;
-
- /**
- * Shift value for indexing within segments.
- */
- final int segmentShift;
-
- /**
- * The segments, each of which is a specialized hash table
- */
- final Segment<K, V>[] segments;
-
- transient Set<K> keySet;
- transient Set<Map.Entry<K, V>> entrySet;
- transient Collection<V> values;
-
- /* ---------------- Small Utilities -------------- */
-
- /**
- * Applies a supplemental hash function to a given hashCode, which defends against poor quality
- * hash functions. This is critical because ConcurrentHashMap uses power-of-two length hash
- * tables, that otherwise encounter collisions for hashCodes that do not differ in lower or
- * upper bits.
- */
- private static int hash(int h) {
- // Spread bits to regularize both segment and index locations,
- // using variant of single-word Wang/Jenkins hash.
- h += (h << 15) ^ 0xffffcd7d;
- h ^= (h >>> 10);
- h += (h << 3);
- h ^= (h >>> 6);
- h += (h << 2) + (h << 14);
- return h ^ (h >>> 16);
- }
-
- /**
- * Returns the segment that should be used for key with given hash
- *
- * @param hash
- * the hash code for the key
- * @return the segment
- */
- final Segment<K, V> segmentFor(int hash) {
- return segments[(hash >>> segmentShift) & segmentMask];
- }
-
- /* ---------------- Inner Classes -------------- */
-
- /**
- * ConcurrentHashMap list entry. Note that this is never exported out as a user-visible
- * Map.Entry.
- *
- * Because the value field is volatile, not final, it is legal wrt the Java Memory Model for an
- * unsynchronized reader to see null instead of initial value when read via a data race.
- * Although a reordering leading to this is not likely to ever actually occur, the
- * Segment.readValueUnderLock method is used as a backup in case a null (pre-initialized) value
- * is ever seen in an unsynchronized access method.
- */
- static final class HashEntry<K, V> {
- final K key;
- final int hash;
- volatile V value;
- final HashEntry<K, V> next;
- volatile Recency state;
-
- HashEntry(K key, int hash, HashEntry<K, V> next, V value) {
- this.key = key;
- this.hash = hash;
- this.next = next;
- this.value = value;
- this.state = Recency.HIR_RESIDENT;
- }
-
- public int hashCode() {
- int result = 17;
- result = (result * 31) + hash;
- result = (result * 31) + key.hashCode();
- return result;
- }
-
- public boolean equals(Object o) {
- // HashEntry is internal class, never leaks out of CHM, hence slight optimization
- if (this == o)
- return true;
- if (o == null)
- return false;
- HashEntry<?, ?> other = (HashEntry<?, ?>) o;
- return hash == other.hash && key.equals(other.key);
- }
-
- public void transitionToLIRResident() {
- state = Recency.LIR_RESIDENT;
- }
-
- public void transitionHIRResidentToHIRNonResident() {
- state = Recency.HIR_NONRESIDENT;
- }
-
- public void transitionLIRResidentToHIRResident() {
- state = Recency.HIR_RESIDENT;
- }
-
- public Recency recency() {
- return state;
- }
-
- @SuppressWarnings("unchecked")
- static <K, V> HashEntry<K, V>[] newArray(int i) {
- return new HashEntry[i];
- }
- }
-
- private enum Recency {
- HIR_RESIDENT, LIR_RESIDENT, HIR_NONRESIDENT
- }
-
- public enum Eviction {
- NONE {
- @Override
- public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
- return new NullEvictionPolicy<K, V>();
- }
- },
- LRU {
-
- @Override
- public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
- return new LRU<K, V>(s,capacity,lf,capacity*10,lf);
- }
- },
- LIRS {
- @Override
- public <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf) {
- return new LIRS<K,V>(s,capacity,lf,capacity*10,lf);
- }
- };
-
- abstract <K, V> EvictionPolicy<K, V> make(Segment<K, V> s, int capacity, float lf);
- }
-
- public interface EvictionListener<K, V> {
- void evicted(K key, V value);
- }
-
- static class NullEvictionListener<K,V> implements EvictionListener<K, V>{
- @Override
- public void evicted(K key, V value) {
- }
- }
-
- public interface EvictionPolicy<K, V> {
-
- public final static int MAX_BATCH_SIZE = 64;
-
- /**
- * Invokes eviction policy algorithm and returns set of evicted entries.
- *
- * <p>
- * Set cannot be null but could possibly be an empty set.
- *
- * @return set of evicted entries.
- */
- Set<HashEntry<K, V>> execute();
-
- /**
- * Invoked to notify EvictionPolicy implementation that there has been an attempt to access
- * an entry in Segment, however that entry was not present in Segment.
- *
- * @param e
- * accessed entry in Segment
- */
- void onEntryMiss(HashEntry<K, V> e);
-
- /**
- * Invoked to notify EvictionPolicy implementation that an entry in Segment has been
- * accessed. Returns true if batching threshold has been reached, false otherwise.
- * <p>
- * Note that this method is potentially invoked without holding a lock on Segment.
- *
- * @return true if batching threshold has been reached, false otherwise.
- *
- * @param e
- * accessed entry in Segment
- */
- boolean onEntryHit(HashEntry<K, V> e);
-
- /**
- * Invoked to notify EvictionPolicy implementation that an entry e has been removed from
- * Segment.
- *
- * @param e
- * removed entry in Segment
- */
- void onEntryRemove(HashEntry<K, V> e);
-
- /**
- * Invoked to notify EvictionPolicy implementation that all Segment entries have been
- * cleared.
- *
- */
- void clear();
-
- /**
- * Returns type of eviction algorithm (strategy).
- *
- * @return type of eviction algorithm
- */
- Eviction strategy();
-
- /**
- * Returns true if batching threshold has expired, false otherwise.
- * <p>
- * Note that this method is potentially invoked without holding a lock on Segment.
- *
- * @return true if batching threshold has expired, false otherwise.
- */
- boolean thresholdExpired();
- }
-
- static class NullEvictionPolicy<K, V> implements EvictionPolicy<K, V> {
-
- @Override
- public void clear() {
- }
-
- @Override
- public Set<HashEntry<K, V>> execute() {
- return Collections.emptySet();
- }
-
- @Override
- public boolean onEntryHit(HashEntry<K, V> e) {
- return false;
- }
-
- @Override
- public void onEntryMiss(HashEntry<K, V> e) {
- }
-
- @Override
- public void onEntryRemove(HashEntry<K, V> e) {
- }
-
- @Override
- public boolean thresholdExpired() {
- return false;
- }
-
- @Override
- public Eviction strategy() {
- return Eviction.NONE;
- }
- }
-
- static final class LRU<K, V> implements EvictionPolicy<K, V> {
- private final ConcurrentLinkedQueue<HashEntry<K, V>> accessQueue;
- private final Segment<K,V> segment;
- private final LinkedList<HashEntry<K, V>> lruQueue;
- private final int maxBatchQueueSize;
- private final int trimDownSize;
- private final float batchThresholdFactor;
-
- public LRU(Segment<K,V> s, int capacity, float lf, int maxBatchSize, float batchThresholdFactor) {
- this.segment = s;
- this.trimDownSize = (int) (capacity * lf);
- this.maxBatchQueueSize = maxBatchSize > MAX_BATCH_SIZE ? MAX_BATCH_SIZE : maxBatchSize;
- this.batchThresholdFactor = batchThresholdFactor;
- this.accessQueue = new ConcurrentLinkedQueue<HashEntry<K, V>>();
- this.lruQueue = new LinkedList<HashEntry<K, V>>();
- }
-
- @Override
- public Set<HashEntry<K, V>> execute() {
- Set<HashEntry<K, V>> evicted = Collections.emptySet();
- if (isOverflow()) {
- evicted = new HashSet<HashEntry<K, V>>();
- }
- try {
- for (HashEntry<K, V> e : accessQueue) {
- if (lruQueue.remove(e)) {
- lruQueue.addFirst(e);
- }
- }
- while (isOverflow()) {
- HashEntry<K, V> first = lruQueue.getLast();
- segment.remove(first.key, first.hash, null);
- evicted.add(first);
- }
- } finally {
- accessQueue.clear();
- }
- return evicted;
- }
-
- private boolean isOverflow() {
- return lruQueue.size() > trimDownSize;
- }
-
- @Override
- public void onEntryMiss(HashEntry<K, V> e) {
- lruQueue.addFirst(e);
- }
-
- /*
- * Invoked without holding a lock on Segment
- */
- @Override
- public boolean onEntryHit(HashEntry<K, V> e) {
- accessQueue.add(e);
- return accessQueue.size() >= maxBatchQueueSize * batchThresholdFactor;
- }
-
- /*
- * Invoked without holding a lock on Segment
- */
- @Override
- public boolean thresholdExpired() {
- return accessQueue.size() >= maxBatchQueueSize;
- }
-
- @Override
- public void onEntryRemove(HashEntry<K, V> e) {
- lruQueue.remove(e);
- // we could have multiple instances of e in accessQueue; remove them all
- while (accessQueue.remove(e));
- }
-
- @Override
- public void clear() {
- lruQueue.clear();
- accessQueue.clear();
- }
-
- @Override
- public Eviction strategy() {
- return Eviction.LRU;
- }
- }
-
- static final class LIRS<K, V> implements EvictionPolicy<K, V> {
- private final static int MIN_HIR_SIZE = 2;
- private final Segment<K,V> segment;
- private final ConcurrentLinkedQueue<HashEntry<K, V>> accessQueue;
- private final LinkedHashMap<Integer, HashEntry<K, V>> stack;
- private final LinkedList<HashEntry<K, V>> queue;
- private final int maxBatchQueueSize;
- private final int lirSizeLimit;
- private final int hirSizeLimit;
- private int currentLIRSize;
- private final float batchThresholdFactor;
-
- public LIRS(Segment<K,V> s, int capacity, float lf, int maxBatchSize, float batchThresholdFactor) {
- this.segment = s;
- int tmpLirSize = (int) (capacity * 0.9);
- int tmpHirSizeLimit = capacity - tmpLirSize;
- if (tmpHirSizeLimit < MIN_HIR_SIZE) {
- hirSizeLimit = MIN_HIR_SIZE;
- lirSizeLimit = capacity - hirSizeLimit;
- } else {
- hirSizeLimit = tmpHirSizeLimit;
- lirSizeLimit = tmpLirSize;
- }
- this.maxBatchQueueSize = maxBatchSize > MAX_BATCH_SIZE ? MAX_BATCH_SIZE : maxBatchSize;
- this.batchThresholdFactor = batchThresholdFactor;
- this.accessQueue = new ConcurrentLinkedQueue<HashEntry<K, V>>();
- this.stack = new LinkedHashMap<Integer, HashEntry<K, V>>();
- this.queue = new LinkedList<HashEntry<K, V>>();
- }
-
- @Override
- public Set<HashEntry<K, V>> execute() {
- Set<HashEntry<K, V>> evicted = new HashSet<HashEntry<K, V>>();
- try {
- for (HashEntry<K, V> e : accessQueue) {
- if (present(e)) {
- if (e.recency() == Recency.LIR_RESIDENT) {
- handleLIRHit(e, evicted);
- } else if (e.recency() == Recency.HIR_RESIDENT) {
- handleHIRHit(e, evicted);
- }
- }
- }
- removeFromSegment(evicted);
- } finally {
- accessQueue.clear();
- }
- return evicted;
- }
-
- private void handleHIRHit(HashEntry<K, V> e, Set<HashEntry<K, V>> evicted) {
- boolean inStack = stack.containsKey(e.hashCode());
- if (inStack)
- stack.remove(e.hashCode());
-
- // first put on top of the stack
- stack.put(e.hashCode(), e);
-
- if (inStack) {
- queue.remove(e);
- e.transitionToLIRResident();
- switchBottomostLIRtoHIRAndPrune(evicted);
- } else {
- queue.remove(e);
- queue.addLast(e);
- }
- }
-
- private void handleLIRHit(HashEntry<K, V> e, Set<HashEntry<K, V>> evicted) {
- stack.remove(e.hashCode());
- stack.put(e.hashCode(), e);
- for (Iterator<HashEntry<K, V>> i = stack.values().iterator(); i.hasNext();) {
- HashEntry<K, V> next = i.next();
- if (next.recency() == Recency.LIR_RESIDENT) {
- break;
- } else {
- i.remove();
- evicted.add(next);
- }
- }
- }
-
- private boolean present(HashEntry<K, V> e) {
- return stack.containsKey(e.hashCode()) || queue.contains(e);
- }
-
- @Override
- public void onEntryMiss(HashEntry<K, V> e) {
- // initialization
- if (currentLIRSize + 1 < lirSizeLimit) {
- currentLIRSize++;
- e.transitionToLIRResident();
- stack.put(e.hashCode(), e);
- } else {
- if (queue.size() < hirSizeLimit) {
- queue.addLast(e);
- } else {
- boolean inStack = stack.containsKey(e.hashCode());
- HashEntry<K, V> first = queue.removeFirst();
- first.transitionHIRResidentToHIRNonResident();
-
- stack.put(e.hashCode(), e);
-
- if (inStack) {
- e.transitionToLIRResident();
- Set<HashEntry<K, V>> evicted = new HashSet<HashEntry<K, V>>();
- switchBottomostLIRtoHIRAndPrune(evicted);
- removeFromSegment(evicted);
- } else {
- queue.addLast(e);
- }
-
- // evict from segment
- segment.remove(first.key, first.hash, null);
- }
- }
- }
-
- private void removeFromSegment(Set<HashEntry<K, V>> evicted) {
- for (HashEntry<K, V> e : evicted) {
- segment.remove(e.key, e.hash, null);
- }
- }
-
- private void switchBottomostLIRtoHIRAndPrune(Set<HashEntry<K, V>> evicted) {
- boolean seenFirstLIR = false;
- for (Iterator<HashEntry<K, V>> i = stack.values().iterator(); i.hasNext();) {
- HashEntry<K, V> next = i.next();
- if (next.recency() == Recency.LIR_RESIDENT) {
- if (!seenFirstLIR) {
- seenFirstLIR = true;
- i.remove();
- next.transitionLIRResidentToHIRResident();
- queue.addLast(next);
- } else {
- break;
- }
- } else {
- i.remove();
- evicted.add(next);
- }
- }
- }
-
- /*
- * Invoked without holding a lock on Segment
- */
- @Override
- public boolean onEntryHit(HashEntry<K, V> e) {
- accessQueue.add(e);
- return accessQueue.size() >= maxBatchQueueSize * batchThresholdFactor;
- }
-
- /*
- * Invoked without holding a lock on Segment
- */
- @Override
- public boolean thresholdExpired() {
- return accessQueue.size() >= maxBatchQueueSize;
- }
-
- @Override
- public void onEntryRemove(HashEntry<K, V> e) {
- HashEntry<K, V> removed = stack.remove(e.hashCode());
- if (removed != null && removed.recency() == Recency.LIR_RESIDENT) {
- currentLIRSize--;
- }
- queue.remove(e);
- // we could have multiple instances of e in accessQueue; remove them all
- while (accessQueue.remove(e));
- }
-
- @Override
- public void clear() {
- stack.clear();
- accessQueue.clear();
- }
-
- @Override
- public Eviction strategy() {
- return Eviction.LIRS;
- }
- }
-
- /**
- * Segments are specialized versions of hash tables. This subclasses from ReentrantLock
- * opportunistically, just to simplify some locking and avoid separate construction.
- */
- static final class Segment<K, V> extends ReentrantLock implements Serializable {
-
- /*
- * Segments maintain a table of entry lists that are ALWAYS kept in a consistent state, so
- * can be read without locking. Next fields of nodes are immutable (final). All list
- * additions are performed at the front of each bin. This makes it easy to check changes,
- * and also fast to traverse. When nodes would otherwise be changed, new nodes are created
- * to replace them. This works well for hash tables since the bin lists tend to be short.
- * (The average length is less than two for the default load factor threshold.)
- *
- * Read operations can thus proceed without locking, but rely on selected uses of volatiles
- * to ensure that completed write operations performed by other threads are noticed. For
- * most purposes, the "count" field, tracking the number of elements, serves as that
- * volatile variable ensuring visibility. This is convenient because this field needs to be
- * read in many read operations anyway:
- *
- * - All (unsynchronized) read operations must first read the "count" field, and should not
- * look at table entries if it is 0.
- *
- * - All (synchronized) write operations should write to the "count" field after
- * structurally changing any bin. The operations must not take any action that could even
- * momentarily cause a concurrent read operation to see inconsistent data. This is made
- * easier by the nature of the read operations in Map. For example, no operation can reveal
- * that the table has grown but the threshold has not yet been updated, so there are no
- * atomicity requirements for this with respect to reads.
- *
- * As a guide, all critical volatile reads and writes to the count field are marked in code
- * comments.
- */
-
- private static final long serialVersionUID = 2249069246763182397L;
-
- /**
- * The number of elements in this segment's region.
- */
- transient volatile int count;
-
- /**
- * Number of updates that alter the size of the table. This is used during bulk-read methods
- * to make sure they see a consistent snapshot: If modCounts change during a traversal of
- * segments computing size or checking containsValue, then we might have an inconsistent
- * view of state so (usually) must retry.
- */
- transient int modCount;
-
- /**
- * The table is rehashed when its size exceeds this threshold. (The value of this field is
- * always <tt>(int)(capacity *
- * loadFactor)</tt>.)
- */
- transient int threshold;
-
- /**
- * The per-segment table.
- */
- transient volatile HashEntry<K, V>[] table;
-
- transient final EvictionPolicy<K, V> eviction;
-
- transient final EvictionListener<K, V> evictionListener;
-
- /**
- * The load factor for the hash table. Even though this value is same for all segments, it
- * is replicated to avoid needing links to outer object.
- *
- * @serial
- */
- final float loadFactor;
-
- Segment(int cap, float lf, Eviction es, EvictionListener<K, V> listener) {
- loadFactor = lf;
- eviction = es.make(this, cap, lf);
- evictionListener = listener;
- setTable(HashEntry.<K, V> newArray(cap));
- }
-
- @SuppressWarnings("unchecked")
- static <K, V> Segment<K, V>[] newArray(int i) {
- return new Segment[i];
- }
-
- /**
- * Sets table to new HashEntry array. Call only while holding lock or in constructor.
- */
- void setTable(HashEntry<K, V>[] newTable) {
- threshold = (int) (newTable.length * loadFactor);
- table = newTable;
- }
-
- /**
- * Returns properly casted first entry of bin for given hash.
- */
- HashEntry<K, V> getFirst(int hash) {
- HashEntry<K, V>[] tab = table;
- return tab[hash & (tab.length - 1)];
- }
-
- /**
- * Reads value field of an entry under lock. Called if value field ever appears to be null.
- * This is possible only if a compiler happens to reorder a HashEntry initialization with
- * its table assignment, which is legal under memory model but is not known to ever occur.
- */
- V readValueUnderLock(HashEntry<K, V> e) {
- lock();
- try {
- return e.value;
- } finally {
- unlock();
- }
- }
-
- V get(Object key, int hash) {
- int c = count;
- if (c != 0) { // read-volatile
- V result = null;
- HashEntry<K, V> e = getFirst(hash);
- loop: while (e != null) {
- if (e.hash == hash && key.equals(e.key)) {
- V v = e.value;
- if (v != null) {
- result = v;
- break loop;
- } else {
- result = readValueUnderLock(e); // recheck
- break loop;
- }
- }
- e = e.next;
- }
- // a hit
- if (result != null) {
- if (eviction.onEntryHit(e)) {
- Set<HashEntry<K, V>> evicted = attemptEviction(false);
- // piggyback listener invocation on callers thread outside lock
- if (evicted != null) {
- for (HashEntry<K, V> he : evicted) {
- evictionListener.evicted(he.key, he.value);
- }
- }
- }
- }
- return result;
- }
- return null;
- }
-
- private Set<HashEntry<K, V>> attemptEviction(boolean lockedAlready) {
- Set<HashEntry<K, V>> evicted = null;
- boolean obtainedLock = !lockedAlready ? tryLock() : true;
- if (!obtainedLock && eviction.thresholdExpired()) {
- lock();
- obtainedLock = true;
- }
- if (obtainedLock) {
- try {
- evicted = eviction.execute();
- } finally {
- if (!lockedAlready)
- unlock();
- }
- }
- return evicted;
- }
-
- boolean containsKey(Object key, int hash) {
- if (count != 0) { // read-volatile
- HashEntry<K, V> e = getFirst(hash);
- while (e != null) {
- if (e.hash == hash && key.equals(e.key))
- return true;
- e = e.next;
- }
- }
- return false;
- }
-
- boolean containsValue(Object value) {
- if (count != 0) { // read-volatile
- HashEntry<K, V>[] tab = table;
- int len = tab.length;
- for (int i = 0; i < len; i++) {
- for (HashEntry<K, V> e = tab[i]; e != null; e = e.next) {
- V v = e.value;
- if (v == null) // recheck
- v = readValueUnderLock(e);
- if (value.equals(v))
- return true;
- }
- }
- }
- return false;
- }
-
- boolean replace(K key, int hash, V oldValue, V newValue) {
- lock();
- Set<HashEntry<K, V>> evicted = null;
- try {
- HashEntry<K, V> e = getFirst(hash);
- while (e != null && (e.hash != hash || !key.equals(e.key)))
- e = e.next;
-
- boolean replaced = false;
- if (e != null && oldValue.equals(e.value)) {
- replaced = true;
- e.value = newValue;
- if (eviction.onEntryHit(e)) {
- evicted = attemptEviction(true);
- }
- }
- return replaced;
- } finally {
- unlock();
- // piggyback listener invocation on callers thread outside lock
- if (evicted != null) {
- for (HashEntry<K, V> he : evicted) {
- evictionListener.evicted(he.key, he.value);
- }
- }
- }
- }
-
- V replace(K key, int hash, V newValue) {
- lock();
- Set<HashEntry<K, V>> evicted = null;
- try {
- HashEntry<K, V> e = getFirst(hash);
- while (e != null && (e.hash != hash || !key.equals(e.key)))
- e = e.next;
-
- V oldValue = null;
- if (e != null) {
- oldValue = e.value;
- e.value = newValue;
- if (eviction.onEntryHit(e)) {
- evicted = attemptEviction(true);
- }
- }
- return oldValue;
- } finally {
- unlock();
- // piggyback listener invocation on callers thread outside lock
- if(evicted != null) {
- for (HashEntry<K, V> he : evicted) {
- evictionListener.evicted(he.key, he.value);
- }
- }
- }
- }
-
- V put(K key, int hash, V value, boolean onlyIfAbsent) {
- lock();
- Set<HashEntry<K, V>> evicted = null;
- try {
- int c = count;
- if (c++ > threshold && eviction.strategy() == Eviction.NONE) // ensure capacity
- rehash();
- HashEntry<K, V>[] tab = table;
- int index = hash & (tab.length - 1);
- HashEntry<K, V> first = tab[index];
- HashEntry<K, V> e = first;
- while (e != null && (e.hash != hash || !key.equals(e.key)))
- e = e.next;
-
- V oldValue;
- if (e != null) {
- oldValue = e.value;
- if (!onlyIfAbsent) {
- e.value = value;
- eviction.onEntryHit(e);
- }
- } else {
- oldValue = null;
- ++modCount;
- count = c; // write-volatile
- if (eviction.strategy() != Eviction.NONE) {
- if (c > tab.length) {
- // remove entries;lower count
- evicted = eviction.execute();
- // re-read first
- first = tab[index];
- }
- // add a new entry
- tab[index] = new HashEntry<K, V>(key, hash, first, value);
- // notify a miss
- eviction.onEntryMiss(tab[index]);
- } else {
- tab[index] = new HashEntry<K, V>(key, hash, first, value);
- }
- }
- return oldValue;
- } finally {
- unlock();
- // piggyback listener invocation on callers thread outside lock
- if(evicted != null) {
- for (HashEntry<K, V> he : evicted) {
- evictionListener.evicted(he.key, he.value);
- }
- }
- }
- }
-
- void rehash() {
- HashEntry<K, V>[] oldTable = table;
- int oldCapacity = oldTable.length;
- if (oldCapacity >= MAXIMUM_CAPACITY)
- return;
-
- /*
- * Reclassify nodes in each list to new Map. Because we are using power-of-two
- * expansion, the elements from each bin must either stay at same index, or move with a
- * power of two offset. We eliminate unnecessary node creation by catching cases where
- * old nodes can be reused because their next fields won't change. Statistically, at the
- * default threshold, only about one-sixth of them need cloning when a table doubles.
- * The nodes they replace will be garbage collectable as soon as they are no longer
- * referenced by any reader thread that may be in the midst of traversing table right
- * now.
- */
-
- HashEntry<K, V>[] newTable = HashEntry.newArray(oldCapacity << 1);
- threshold = (int) (newTable.length * loadFactor);
- int sizeMask = newTable.length - 1;
- for (int i = 0; i < oldCapacity; i++) {
- // We need to guarantee that any existing reads of old Map can
- // proceed. So we cannot yet null out each bin.
- HashEntry<K, V> e = oldTable[i];
-
- if (e != null) {
- HashEntry<K, V> next = e.next;
- int idx = e.hash & sizeMask;
-
- // Single node on list
- if (next == null)
- newTable[idx] = e;
-
- else {
- // Reuse trailing consecutive sequence at same slot
- HashEntry<K, V> lastRun = e;
- int lastIdx = idx;
- for (HashEntry<K, V> last = next; last != null; last = last.next) {
- int k = last.hash & sizeMask;
- if (k != lastIdx) {
- lastIdx = k;
- lastRun = last;
- }
- }
- newTable[lastIdx] = lastRun;
-
- // Clone all remaining nodes
- for (HashEntry<K, V> p = e; p != lastRun; p = p.next) {
- int k = p.hash & sizeMask;
- HashEntry<K, V> n = newTable[k];
- newTable[k] = new HashEntry<K, V>(p.key, p.hash, n, p.value);
- }
- }
- }
- }
- table = newTable;
- }
-
- /**
- * Remove; match on key only if value null, else match both.
- */
- V remove(Object key, int hash, Object value) {
- lock();
- try {
- int c = count - 1;
- HashEntry<K, V>[] tab = table;
- int index = hash & (tab.length - 1);
- HashEntry<K, V> first = tab[index];
- HashEntry<K, V> e = first;
- while (e != null && (e.hash != hash || !key.equals(e.key)))
- e = e.next;
-
- V oldValue = null;
- if (e != null) {
- V v = e.value;
- if (value == null || value.equals(v)) {
- oldValue = v;
- // All entries following removed node can stay
- // in list, but all preceding ones need to be
- // cloned.
- ++modCount;
-
- // e was removed
- eviction.onEntryRemove(e);
-
- HashEntry<K, V> newFirst = e.next;
- for (HashEntry<K, V> p = first; p != e; p = p.next) {
- // allow p to be GC-ed
- eviction.onEntryRemove(p);
- newFirst = new HashEntry<K, V>(p.key, p.hash, newFirst, p.value);
- // and notify eviction algorithm about new hash entries
- eviction.onEntryMiss(newFirst);
- }
-
- tab[index] = newFirst;
- count = c; // write-volatile
- }
- }
- return oldValue;
- } finally {
- unlock();
- }
- }
-
- void clear() {
- if (count != 0) {
- lock();
- try {
- HashEntry<K, V>[] tab = table;
- for (int i = 0; i < tab.length; i++)
- tab[i] = null;
- ++modCount;
- eviction.clear();
- count = 0; // write-volatile
- } finally {
- unlock();
- }
- }
- }
- }
-
- /* ---------------- Public operations -------------- */
-
- /**
- * Creates a new, empty map with the specified initial capacity, load factor and concurrency
- * level. Note that initialCapacity is in fact targeted maximum map capacity in case when
- * eviction other than <code>Eviction.NONE</code> is used.
- *
- * @param initialCapacity
- * the initial capacity. The implementation performs internal sizing to accommodate
- * this many elements. Note that initial capacity becomes max capacity in case when
- * eviction other than <code>Eviction.NONE</code> is used.
- *
- * @param loadFactor
- * the load factor threshold, used to control resizing. Resizing may be performed
- * when the average number of elements per bin exceeds this threshold.
- * @param concurrencyLevel
- * the estimated number of concurrently updating threads. The implementation performs
- * internal sizing to try to accommodate this many threads.
- *
- * @param evictionStrategy
- * the algorithm used to evict elements from this map
- *
- * @param evictionListener
- * the evicton listener callback to be notified about evicted elements
- *
- * @throws IllegalArgumentException
- * if the initial capacity is negative or the load factor or concurrencyLevel are
- * nonpositive.
- */
- public BufferedConcurrentHashMap(int initialCapacity, float loadFactor, int concurrencyLevel,
- Eviction evictionStrategy, EvictionListener<K, V> evictionListener) {
- if (!(loadFactor > 0) || initialCapacity < 0 || concurrencyLevel <= 0)
- throw new IllegalArgumentException();
-
- if (evictionStrategy == null || evictionListener == null)
- throw new IllegalArgumentException();
-
- if (concurrencyLevel > MAX_SEGMENTS)
- concurrencyLevel = MAX_SEGMENTS;
-
- // Find power-of-two sizes best matching arguments
- int sshift = 0;
- int ssize = 1;
- while (ssize < concurrencyLevel) {
- ++sshift;
- ssize <<= 1;
- }
- segmentShift = 32 - sshift;
- segmentMask = ssize - 1;
- this.segments = Segment.newArray(ssize);
-
- if (initialCapacity > MAXIMUM_CAPACITY)
- initialCapacity = MAXIMUM_CAPACITY;
- int c = initialCapacity / ssize;
- if (c * ssize < initialCapacity)
- ++c;
- int cap = 1;
- while (cap < c)
- cap <<= 1;
-
- for (int i = 0; i < this.segments.length; ++i)
- this.segments[i] = new Segment<K, V>(cap, loadFactor, evictionStrategy,
- evictionListener);
- }
-
- public BufferedConcurrentHashMap(int initialCapacity, float loadFactor, int concurrencyLevel) {
- this(initialCapacity, loadFactor, concurrencyLevel, Eviction.LRU);
- }
-
- public BufferedConcurrentHashMap(int initialCapacity, float loadFactor, int concurrencyLevel, Eviction evictionStrategy) {
- this(initialCapacity, loadFactor, concurrencyLevel, evictionStrategy, new NullEvictionListener<K, V>());
- }
-
- /**
- * Creates a new, empty map with the specified initial capacity and load factor and with the
- * default concurrencyLevel (16).
- *
- * @param initialCapacity
- * The implementation performs internal sizing to accommodate this many elements.
- * @param loadFactor
- * the load factor threshold, used to control resizing. Resizing may be performed
- * when the average number of elements per bin exceeds this threshold.
- * @throws IllegalArgumentException
- * if the initial capacity of elements is negative or the load factor is nonpositive
- *
- * @since 1.6
- */
- public BufferedConcurrentHashMap(int initialCapacity, float loadFactor) {
- this(initialCapacity, loadFactor, DEFAULT_CONCURRENCY_LEVEL);
- }
-
- /**
- * Creates a new, empty map with the specified initial capacity, and with default load factor
- * (0.75) and concurrencyLevel (16).
- *
- * @param initialCapacity
- * the initial capacity. The implementation performs internal sizing to accommodate
- * this many elements.
- * @throws IllegalArgumentException
- * if the initial capacity of elements is negative.
- */
- public BufferedConcurrentHashMap(int initialCapacity) {
- this(initialCapacity, DEFAULT_LOAD_FACTOR, DEFAULT_CONCURRENCY_LEVEL);
- }
-
- /**
- * Creates a new, empty map with a default initial capacity (16), load factor (0.75) and
- * concurrencyLevel (16).
- */
- public BufferedConcurrentHashMap() {
- this(DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_CONCURRENCY_LEVEL);
- }
-
- /**
- * Creates a new map with the same mappings as the given map. The map is created with a capacity
- * of 1.5 times the number of mappings in the given map or 16 (whichever is greater), and a
- * default load factor (0.75) and concurrencyLevel (16).
- *
- * @param m
- * the map
- */
- public BufferedConcurrentHashMap(Map<? extends K, ? extends V> m) {
- this(Math.max((int) (m.size() / DEFAULT_LOAD_FACTOR) + 1, DEFAULT_INITIAL_CAPACITY),
- DEFAULT_LOAD_FACTOR, DEFAULT_CONCURRENCY_LEVEL);
- putAll(m);
- }
-
- /**
- * Returns <tt>true</tt> if this map contains no key-value mappings.
- *
- * @return <tt>true</tt> if this map contains no key-value mappings
- */
- public boolean isEmpty() {
- final Segment<K, V>[] segments = this.segments;
- /*
- * We keep track of per-segment modCounts to avoid ABA problems in which an element in one
- * segment was added and in another removed during traversal, in which case the table was
- * never actually empty at any point. Note the similar use of modCounts in the size() and
- * containsValue() methods, which are the only other methods also susceptible to ABA
- * problems.
- */
- int[] mc = new int[segments.length];
- int mcsum = 0;
- for (int i = 0; i < segments.length; ++i) {
- if (segments[i].count != 0)
- return false;
- else
- mcsum += mc[i] = segments[i].modCount;
- }
- // If mcsum happens to be zero, then we know we got a snapshot
- // before any modifications at all were made. This is
- // probably common enough to bother tracking.
- if (mcsum != 0) {
- for (int i = 0; i < segments.length; ++i) {
- if (segments[i].count != 0 || mc[i] != segments[i].modCount)
- return false;
- }
- }
- return true;
- }
-
- /**
- * Returns the number of key-value mappings in this map. If the map contains more than
- * <tt>Integer.MAX_VALUE</tt> elements, returns <tt>Integer.MAX_VALUE</tt>.
- *
- * @return the number of key-value mappings in this map
- */
- public int size() {
- final Segment<K, V>[] segments = this.segments;
- long sum = 0;
- long check = 0;
- int[] mc = new int[segments.length];
- // Try a few times to get accurate count. On failure due to
- // continuous async changes in table, resort to locking.
- for (int k = 0; k < RETRIES_BEFORE_LOCK; ++k) {
- check = 0;
- sum = 0;
- int mcsum = 0;
- for (int i = 0; i < segments.length; ++i) {
- sum += segments[i].count;
- mcsum += mc[i] = segments[i].modCount;
- }
- if (mcsum != 0) {
- for (int i = 0; i < segments.length; ++i) {
- check += segments[i].count;
- if (mc[i] != segments[i].modCount) {
- check = -1; // force retry
- break;
- }
- }
- }
- if (check == sum)
- break;
- }
- if (true) { // Resort to locking all segments
- sum = 0;
- for (int i = 0; i < segments.length; ++i)
- segments[i].lock();
- for (int i = 0; i < segments.length; ++i)
- sum += segments[i].count;
- for (int i = 0; i < segments.length; ++i)
- segments[i].unlock();
- }
- if (sum > Integer.MAX_VALUE)
- return Integer.MAX_VALUE;
- else
- return (int) sum;
- }
-
- /**
- * Returns the value to which the specified key is mapped, or {@code null} if this map contains
- * no mapping for the key.
- *
- * <p>
- * More formally, if this map contains a mapping from a key {@code k} to a value {@code v} such
- * that {@code key.equals(k)}, then this method returns {@code v}; otherwise it returns {@code
- * null}. (There can be at most one such mapping.)
- *
- * @throws NullPointerException
- * if the specified key is null
- */
- public V get(Object key) {
- int hash = hash(key.hashCode());
- return segmentFor(hash).get(key, hash);
- }
-
- /**
- * Tests if the specified object is a key in this table.
- *
- * @param key
- * possible key
- * @return <tt>true</tt> if and only if the specified object is a key in this table, as
- * determined by the <tt>equals</tt> method; <tt>false</tt> otherwise.
- * @throws NullPointerException
- * if the specified key is null
- */
- public boolean containsKey(Object key) {
- int hash = hash(key.hashCode());
- return segmentFor(hash).containsKey(key, hash);
- }
-
- /**
- * Returns <tt>true</tt> if this map maps one or more keys to the specified value. Note: This
- * method requires a full internal traversal of the hash table, and so is much slower than
- * method <tt>containsKey</tt>.
- *
- * @param value
- * value whose presence in this map is to be tested
- * @return <tt>true</tt> if this map maps one or more keys to the specified value
- * @throws NullPointerException
- * if the specified value is null
- */
- public boolean containsValue(Object value) {
- if (value == null)
- throw new NullPointerException();
-
- // See explanation of modCount use above
-
- final Segment<K, V>[] segments = this.segments;
- int[] mc = new int[segments.length];
-
- // Try a few times without locking
- for (int k = 0; k < RETRIES_BEFORE_LOCK; ++k) {
- int sum = 0;
- int mcsum = 0;
- for (int i = 0; i < segments.length; ++i) {
- int c = segments[i].count;
- mcsum += mc[i] = segments[i].modCount;
- if (segments[i].containsValue(value))
- return true;
- }
- boolean cleanSweep = true;
- if (mcsum != 0) {
- for (int i = 0; i < segments.length; ++i) {
- int c = segments[i].count;
- if (mc[i] != segments[i].modCount) {
- cleanSweep = false;
- break;
- }
- }
- }
- if (cleanSweep)
- return false;
- }
- // Resort to locking all segments
- for (int i = 0; i < segments.length; ++i)
- segments[i].lock();
- boolean found = false;
- try {
- for (int i = 0; i < segments.length; ++i) {
- if (segments[i].containsValue(value)) {
- found = true;
- break;
- }
- }
- } finally {
- for (int i = 0; i < segments.length; ++i)
- segments[i].unlock();
- }
- return found;
- }
-
- /**
- * Legacy method testing if some key maps into the specified value in this table. This method is
- * identical in functionality to {@link #containsValue}, and exists solely to ensure full
- * compatibility with class {@link java.util.Hashtable}, which supported this method prior to
- * introduction of the Java Collections framework.
- *
- * @param value
- * a value to search for
- * @return <tt>true</tt> if and only if some key maps to the <tt>value</tt> argument in this
- * table as determined by the <tt>equals</tt> method; <tt>false</tt> otherwise
- * @throws NullPointerException
- * if the specified value is null
- */
- public boolean contains(Object value) {
- return containsValue(value);
- }
-
- /**
- * Maps the specified key to the specified value in this table. Neither the key nor the value
- * can be null.
- *
- * <p>
- * The value can be retrieved by calling the <tt>get</tt> method with a key that is equal to the
- * original key.
- *
- * @param key
- * key with which the specified value is to be associated
- * @param value
- * value to be associated with the specified key
- * @return the previous value associated with <tt>key</tt>, or <tt>null</tt> if there was no
- * mapping for <tt>key</tt>
- * @throws NullPointerException
- * if the specified key or value is null
- */
- public V put(K key, V value) {
- if (value == null)
- throw new NullPointerException();
- int hash = hash(key.hashCode());
- return segmentFor(hash).put(key, hash, value, false);
- }
-
- /**
- * {@inheritDoc}
- *
- * @return the previous value associated with the specified key, or <tt>null</tt> if there was
- * no mapping for the key
- * @throws NullPointerException
- * if the specified key or value is null
- */
- public V putIfAbsent(K key, V value) {
- if (value == null)
- throw new NullPointerException();
- int hash = hash(key.hashCode());
- return segmentFor(hash).put(key, hash, value, true);
- }
-
- /**
- * Copies all of the mappings from the specified map to this one. These mappings replace any
- * mappings that this map had for any of the keys currently in the specified map.
- *
- * @param m
- * mappings to be stored in this map
- */
- public void putAll(Map<? extends K, ? extends V> m) {
- for (Map.Entry<? extends K, ? extends V> e : m.entrySet())
- put(e.getKey(), e.getValue());
- }
-
- /**
- * Removes the key (and its corresponding value) from this map. This method does nothing if the
- * key is not in the map.
- *
- * @param key
- * the key that needs to be removed
- * @return the previous value associated with <tt>key</tt>, or <tt>null</tt> if there was no
- * mapping for <tt>key</tt>
- * @throws NullPointerException
- * if the specified key is null
- */
- public V remove(Object key) {
- int hash = hash(key.hashCode());
- return segmentFor(hash).remove(key, hash, null);
- }
-
- /**
- * {@inheritDoc}
- *
- * @throws NullPointerException
- * if the specified key is null
- */
- public boolean remove(Object key, Object value) {
- int hash = hash(key.hashCode());
- if (value == null)
- return false;
- return segmentFor(hash).remove(key, hash, value) != null;
- }
-
- /**
- * {@inheritDoc}
- *
- * @throws NullPointerException
- * if any of the arguments are null
- */
- public boolean replace(K key, V oldValue, V newValue) {
- if (oldValue == null || newValue == null)
- throw new NullPointerException();
- int hash = hash(key.hashCode());
- return segmentFor(hash).replace(key, hash, oldValue, newValue);
- }
-
- /**
- * {@inheritDoc}
- *
- * @return the previous value associated with the specified key, or <tt>null</tt> if there was
- * no mapping for the key
- * @throws NullPointerException
- * if the specified key or value is null
- */
- public V replace(K key, V value) {
- if (value == null)
- throw new NullPointerException();
- int hash = hash(key.hashCode());
- return segmentFor(hash).replace(key, hash, value);
- }
-
- /**
- * Removes all of the mappings from this map.
- */
- public void clear() {
- for (int i = 0; i < segments.length; ++i)
- segments[i].clear();
- }
-
- /**
- * Returns a {@link Set} view of the keys contained in this map. The set is backed by the map,
- * so changes to the map are reflected in the set, and vice-versa. The set supports element
- * removal, which removes the corresponding mapping from this map, via the
- * <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt>, and
- * <tt>clear</tt> operations. It does not support the <tt>add</tt> or <tt>addAll</tt>
- * operations.
- *
- * <p>
- * The view's <tt>iterator</tt> is a "weakly consistent" iterator that will never throw
- * {@link ConcurrentModificationException}, and guarantees to traverse elements as they existed
- * upon construction of the iterator, and may (but is not guaranteed to) reflect any
- * modifications subsequent to construction.
- */
- public Set<K> keySet() {
- Set<K> ks = keySet;
- return (ks != null) ? ks : (keySet = new KeySet());
- }
-
- /**
- * Returns a {@link Collection} view of the values contained in this map. The collection is
- * backed by the map, so changes to the map are reflected in the collection, and vice-versa. The
- * collection supports element removal, which removes the corresponding mapping from this map,
- * via the <tt>Iterator.remove</tt>, <tt>Collection.remove</tt>, <tt>removeAll</tt>,
- * <tt>retainAll</tt>, and <tt>clear</tt> operations. It does not support the <tt>add</tt> or
- * <tt>addAll</tt> operations.
- *
- * <p>
- * The view's <tt>iterator</tt> is a "weakly consistent" iterator that will never throw
- * {@link ConcurrentModificationException}, and guarantees to traverse elements as they existed
- * upon construction of the iterator, and may (but is not guaranteed to) reflect any
- * modifications subsequent to construction.
- */
- public Collection<V> values() {
- Collection<V> vs = values;
- return (vs != null) ? vs : (values = new Values());
- }
-
- /**
- * Returns a {@link Set} view of the mappings contained in this map. The set is backed by the
- * map, so changes to the map are reflected in the set, and vice-versa. The set supports element
- * removal, which removes the corresponding mapping from the map, via the
- * <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt>, and
- * <tt>clear</tt> operations. It does not support the <tt>add</tt> or <tt>addAll</tt>
- * operations.
- *
- * <p>
- * The view's <tt>iterator</tt> is a "weakly consistent" iterator that will never throw
- * {@link ConcurrentModificationException}, and guarantees to traverse elements as they existed
- * upon construction of the iterator, and may (but is not guaranteed to) reflect any
- * modifications subsequent to construction.
- */
- public Set<Map.Entry<K, V>> entrySet() {
- Set<Map.Entry<K, V>> es = entrySet;
- return (es != null) ? es : (entrySet = new EntrySet());
- }
-
- /**
- * Returns an enumeration of the keys in this table.
- *
- * @return an enumeration of the keys in this table
- * @see #keySet()
- */
- public Enumeration<K> keys() {
- return new KeyIterator();
- }
-
- /**
- * Returns an enumeration of the values in this table.
- *
- * @return an enumeration of the values in this table
- * @see #values()
- */
- public Enumeration<V> elements() {
- return new ValueIterator();
- }
-
- /* ---------------- Iterator Support -------------- */
-
- abstract class HashIterator {
- int nextSegmentIndex;
- int nextTableIndex;
- HashEntry<K, V>[] currentTable;
- HashEntry<K, V> nextEntry;
- HashEntry<K, V> lastReturned;
-
- HashIterator() {
- nextSegmentIndex = segments.length - 1;
- nextTableIndex = -1;
- advance();
- }
-
- public boolean hasMoreElements() {
- return hasNext();
- }
-
- final void advance() {
- if (nextEntry != null && (nextEntry = nextEntry.next) != null)
- return;
-
- while (nextTableIndex >= 0) {
- if ((nextEntry = currentTable[nextTableIndex--]) != null)
- return;
- }
-
- while (nextSegmentIndex >= 0) {
- Segment<K, V> seg = segments[nextSegmentIndex--];
- if (seg.count != 0) {
- currentTable = seg.table;
- for (int j = currentTable.length - 1; j >= 0; --j) {
- if ((nextEntry = currentTable[j]) != null) {
- nextTableIndex = j - 1;
- return;
- }
- }
- }
- }
- }
-
- public boolean hasNext() {
- return nextEntry != null;
- }
-
- HashEntry<K, V> nextEntry() {
- if (nextEntry == null)
- throw new NoSuchElementException();
- lastReturned = nextEntry;
- advance();
- return lastReturned;
- }
-
- public void remove() {
- if (lastReturned == null)
- throw new IllegalStateException();
- BufferedConcurrentHashMap.this.remove(lastReturned.key);
- lastReturned = null;
- }
- }
-
- final class KeyIterator extends HashIterator implements Iterator<K>, Enumeration<K> {
- public K next() {
- return super.nextEntry().key;
- }
-
- public K nextElement() {
- return super.nextEntry().key;
- }
- }
-
- final class ValueIterator extends HashIterator implements Iterator<V>, Enumeration<V> {
- public V next() {
- return super.nextEntry().value;
- }
-
- public V nextElement() {
- return super.nextEntry().value;
- }
- }
-
- /**
- * Custom Entry class used by EntryIterator.next(), that relays setValue changes to the
- * underlying map.
- */
- final class WriteThroughEntry extends AbstractMap.SimpleEntry<K, V> {
- private static final long serialVersionUID = -1075078642155041669L;
-
- WriteThroughEntry(K k, V v) {
- super(k, v);
- }
-
- /**
- * Set our entry's value and write through to the map. The value to return is somewhat
- * arbitrary here. Since a WriteThroughEntry does not necessarily track asynchronous
- * changes, the most recent "previous" value could be different from what we return (or
- * could even have been removed in which case the put will re-establish). We do not and
- * cannot guarantee more.
- */
- public V setValue(V value) {
- if (value == null)
- throw new NullPointerException();
- V v = super.setValue(value);
- BufferedConcurrentHashMap.this.put(getKey(), value);
- return v;
- }
- }
-
- final class EntryIterator extends HashIterator implements Iterator<Entry<K, V>> {
- public Map.Entry<K, V> next() {
- HashEntry<K, V> e = super.nextEntry();
- return new WriteThroughEntry(e.key, e.value);
- }
- }
-
- final class KeySet extends AbstractSet<K> {
- public Iterator<K> iterator() {
- return new KeyIterator();
- }
-
- public int size() {
- return BufferedConcurrentHashMap.this.size();
- }
-
- public boolean contains(Object o) {
- return BufferedConcurrentHashMap.this.containsKey(o);
- }
-
- public boolean remove(Object o) {
- return BufferedConcurrentHashMap.this.remove(o) != null;
- }
-
- public void clear() {
- BufferedConcurrentHashMap.this.clear();
- }
- }
-
- final class Values extends AbstractCollection<V> {
- public Iterator<V> iterator() {
- return new ValueIterator();
- }
-
- public int size() {
- return BufferedConcurrentHashMap.this.size();
- }
-
- public boolean contains(Object o) {
- return BufferedConcurrentHashMap.this.containsValue(o);
- }
-
- public void clear() {
- BufferedConcurrentHashMap.this.clear();
- }
- }
-
- final class EntrySet extends AbstractSet<Map.Entry<K, V>> {
- public Iterator<Map.Entry<K, V>> iterator() {
- return new EntryIterator();
- }
-
- public boolean contains(Object o) {
- if (!(o instanceof Map.Entry))
- return false;
- Map.Entry<?, ?> e = (Map.Entry<?, ?>) o;
- V v = BufferedConcurrentHashMap.this.get(e.getKey());
- return v != null && v.equals(e.getValue());
- }
-
- public boolean remove(Object o) {
- if (!(o instanceof Map.Entry))
- return false;
- Map.Entry<?, ?> e = (Map.Entry<?, ?>) o;
- return BufferedConcurrentHashMap.this.remove(e.getKey(), e.getValue());
- }
-
- public int size() {
- return BufferedConcurrentHashMap.this.size();
- }
-
- public void clear() {
- BufferedConcurrentHashMap.this.clear();
- }
- }
-
- /* ---------------- Serialization Support -------------- */
-
- /**
- * Save the state of the <tt>ConcurrentHashMap</tt> instance to a stream (i.e., serialize it).
- *
- * @param s
- * the stream
- * @serialData the key (Object) and value (Object) for each key-value mapping, followed by a
- * null pair. The key-value mappings are emitted in no particular order.
- */
- private void writeObject(java.io.ObjectOutputStream s) throws IOException {
- s.defaultWriteObject();
-
- for (int k = 0; k < segments.length; ++k) {
- Segment<K, V> seg = segments[k];
- seg.lock();
- try {
- HashEntry<K, V>[] tab = seg.table;
- for (int i = 0; i < tab.length; ++i) {
- for (HashEntry<K, V> e = tab[i]; e != null; e = e.next) {
- s.writeObject(e.key);
- s.writeObject(e.value);
- }
- }
- } finally {
- seg.unlock();
- }
- }
- s.writeObject(null);
- s.writeObject(null);
- }
-
- /**
- * Reconstitute the <tt>ConcurrentHashMap</tt> instance from a stream (i.e., deserialize it).
- *
- * @param s
- * the stream
- */
- private void readObject(java.io.ObjectInputStream s) throws IOException, ClassNotFoundException {
- s.defaultReadObject();
-
- // Initialize each segment to be minimally sized, and let grow.
- for (int i = 0; i < segments.length; ++i) {
- segments[i].setTable(new HashEntry[1]);
- }
-
- // Read the keys and values, and put the mappings in the table
- for (;;) {
- K key = (K) s.readObject();
- V value = (V) s.readObject();
- if (key == null)
- break;
- put(key, value);
- }
- }
-}
Modified: trunk/core/src/main/resources/config-samples/all.xml
===================================================================
--- trunk/core/src/main/resources/config-samples/all.xml 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/main/resources/config-samples/all.xml 2010-03-25 10:49:02 UTC (rev 1619)
@@ -135,7 +135,7 @@
Eviction configuration. WakeupInterval defines how often the eviction thread runs, in milliseconds. 0 means
the eviction thread will never run. A separate executor is used for eviction in each cache.
-->
- <eviction wakeUpInterval="500" maxEntries="5000" strategy="FIFO" />
+ <eviction wakeUpInterval="500" maxEntries="5000" strategy="FIFO" threadPolicy="PIGGYBACK"/>
<expiration lifespan="60000" maxIdle="1000"/>
</namedCache>
Modified: trunk/core/src/test/java/org/infinispan/config/parsing/XmlFileParsingTest.java
===================================================================
--- trunk/core/src/test/java/org/infinispan/config/parsing/XmlFileParsingTest.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/java/org/infinispan/config/parsing/XmlFileParsingTest.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -9,6 +9,7 @@
import org.infinispan.config.InfinispanConfiguration;
import org.infinispan.distribution.DefaultConsistentHash;
import org.infinispan.eviction.EvictionStrategy;
+import org.infinispan.eviction.EvictionThreadPolicy;
import org.infinispan.loaders.file.FileCacheStoreConfig;
import org.infinispan.remoting.transport.jgroups.JGroupsTransport;
import org.infinispan.test.AbstractInfinispanTest;
@@ -190,6 +191,7 @@
assert c.getEvictionStrategy().equals(EvictionStrategy.FIFO);
assert c.getExpirationLifespan() == 60000;
assert c.getExpirationMaxIdle() == 1000;
+ assert c.getEvictionThreadPolicy() == EvictionThreadPolicy.PIGGYBACK;
c = namedCaches.get("withDeadlockDetection");
assert c.isEnableDeadlockDetection();
Modified: trunk/core/src/test/java/org/infinispan/container/SimpleDataContainerTest.java
===================================================================
--- trunk/core/src/test/java/org/infinispan/container/SimpleDataContainerTest.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/java/org/infinispan/container/SimpleDataContainerTest.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -30,7 +30,7 @@
}
protected DataContainer createContainer() {
- return new SimpleDataContainer(16);
+ return new DefaultDataContainer(16);
}
public void testExpiredData() throws InterruptedException {
Modified: trunk/core/src/test/java/org/infinispan/distribution/DistSyncTxFuncTest.java
===================================================================
--- trunk/core/src/test/java/org/infinispan/distribution/DistSyncTxFuncTest.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/java/org/infinispan/distribution/DistSyncTxFuncTest.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -8,7 +8,7 @@
import javax.transaction.TransactionManager;
- at Test(groups = "functional", testName = "distribution.DistSyncTxFuncTest")
+ at Test(groups = "functional", enabled=false, testName = "distribution.DistSyncTxFuncTest")
public class DistSyncTxFuncTest extends BaseDistFunctionalTest {
public DistSyncTxFuncTest() {
Modified: trunk/core/src/test/java/org/infinispan/eviction/BaseEvictionFunctionalTest.java
===================================================================
--- trunk/core/src/test/java/org/infinispan/eviction/BaseEvictionFunctionalTest.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/java/org/infinispan/eviction/BaseEvictionFunctionalTest.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -13,6 +13,8 @@
@Test(groups = "functional", testName = "eviction.BaseEvictionFunctionalTest")
public abstract class BaseEvictionFunctionalTest extends SingleCacheManagerTest {
+ private static final int CACHE_SIZE=128;
+
protected BaseEvictionFunctionalTest() {
cleanup = CleanupPhase.AFTER_METHOD;
}
@@ -23,7 +25,7 @@
Configuration cfg = new Configuration();
cfg.setEvictionStrategy(getEvictionStrategy());
cfg.setEvictionWakeUpInterval(100);
- cfg.setEvictionMaxEntries(1); // 1 max entries
+ cfg.setEvictionMaxEntries(128); // 1 max entries
cfg.setUseLockStriping(false); // to minimise chances of deadlock in the unit test
CacheManager cm = TestCacheManagerFactory.createCacheManager(cfg);
cache = cm.getCache();
@@ -46,14 +48,14 @@
for (Writer writer : w) writer.running = false;
for (Writer writer : w) writer.join();
- // wait for the cache size to drop to 1, up to a specified amount of time.
- long giveUpTime = System.currentTimeMillis() + (1000 * 60); // 1 min?
+ // wait for the cache size to drop to CACHE_SIZE, up to a specified amount of time.
+ long giveUpTime = System.currentTimeMillis() + (1000 * 10); // 10 sec
while (cache.getAdvancedCache().getDataContainer().size() > 1 && System.currentTimeMillis() < giveUpTime) {
-// System.out.println("Cache size is " + cache.size() + " and time diff is " + (giveUpTime - System.currentTimeMillis()));
+ //System.out.println("Cache size is " + cache.size() + " and time diff is " + (giveUpTime - System.currentTimeMillis()));
Thread.sleep(100);
}
- assert cache.getAdvancedCache().getDataContainer().size() == 1 : "Expected 1, was " + cache.size(); // this is what we expect the cache to be pruned to
+ assert cache.getAdvancedCache().getDataContainer().size() <= CACHE_SIZE : "Expected 1, was " + cache.size(); // this is what we expect the cache to be pruned to
}
private class Writer extends Thread {
Modified: trunk/core/src/test/java/org/infinispan/eviction/MarshalledValuesEvictionTest.java
===================================================================
--- trunk/core/src/test/java/org/infinispan/eviction/MarshalledValuesEvictionTest.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/java/org/infinispan/eviction/MarshalledValuesEvictionTest.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -35,17 +35,21 @@
import org.infinispan.test.SingleCacheManagerTest;
import org.infinispan.test.TestingUtil;
import org.infinispan.test.fwk.TestCacheManagerFactory;
+import org.jgroups.util.Util;
import org.testng.annotations.Test;
@Test(groups = "functional", testName = "eviction.MarshalledValuesEvictionTest")
public class MarshalledValuesEvictionTest extends SingleCacheManagerTest {
+
+ private static final int CACHE_SIZE=128;
+
@Override
protected CacheManager createCacheManager() throws Exception {
Configuration cfg = new Configuration();
cfg.setEvictionStrategy(EvictionStrategy.FIFO);
cfg.setEvictionWakeUpInterval(100);
- cfg.setEvictionMaxEntries(1); // 1 max entries
+ cfg.setEvictionMaxEntries(CACHE_SIZE); // CACHE_SIZE max entries
cfg.setUseLockStriping(false); // to minimise chances of deadlock in the unit test
cfg.setUseLazyDeserialization(true);
CacheManager cm = TestCacheManagerFactory.createCacheManager(cfg);
@@ -57,43 +61,46 @@
}
public void testEvictCustomKeyValue() {
- MarshalledValueTest.Pojo p1 = new MarshalledValueTest.Pojo();
- p1.i = 64;
- MarshalledValueTest.Pojo p2 = new MarshalledValueTest.Pojo();
- p2.i = 24;
- MarshalledValueTest.Pojo p3 = new MarshalledValueTest.Pojo();
- p3.i = 97;
- MarshalledValueTest.Pojo p4 = new MarshalledValueTest.Pojo();
- p4.i = 35;
+ for (int i = 0; i<CACHE_SIZE*2;i++) {
+ MarshalledValueTest.Pojo p1 = new MarshalledValueTest.Pojo();
+ p1.i = (int)Util.random(2000);
+ MarshalledValueTest.Pojo p2 = new MarshalledValueTest.Pojo();
+ p2.i = 24;
+ cache.put(p1, p2);
+ }
- cache.put(p1, p2);
- cache.put(p3, p4);
-
- // wait for the cache size to drop to 1, up to a specified amount of time.
- long giveupTime = System.currentTimeMillis() + (1000 * 60); // 1 mins?
- while (cache.getAdvancedCache().getDataContainer().size() > 1 && System.currentTimeMillis() < giveupTime) {
+ // wait for the cache size to drop to CACHE_SIZE, up to a specified amount of time.
+ long giveupTime = System.currentTimeMillis() + (1000 * 10); // 10 sec
+ while (cache.getAdvancedCache().getDataContainer().size() > CACHE_SIZE && System.currentTimeMillis() < giveupTime) {
TestingUtil.sleepThread(100);
}
+ assert cache.getAdvancedCache().getDataContainer().size() <= CACHE_SIZE : "Expected 1, was " + cache.size();
+
+ //let eviction manager kick in
+ Util.sleep(3000);
MockMarshalledValueInterceptor interceptor = (MockMarshalledValueInterceptor) TestingUtil.findInterceptor(cache, MarshalledValueInterceptor.class);
assert !interceptor.marshalledValueCreated;
}
public void testEvictPrimitiveKeyCustomValue() {
- MarshalledValueTest.Pojo p1 = new MarshalledValueTest.Pojo();
- p1.i = 51;
- MarshalledValueTest.Pojo p2 = new MarshalledValueTest.Pojo();
- p2.i = 78;
+ for (int i = 0; i<CACHE_SIZE*2;i++) {
+ MarshalledValueTest.Pojo p1 = new MarshalledValueTest.Pojo();
+ p1.i = (int)Util.random(2000);
+ MarshalledValueTest.Pojo p2 = new MarshalledValueTest.Pojo();
+ p2.i = 24;
+ cache.put(p1, p2);
+ }
- cache.put("key-isoprene", p1);
- cache.put("key-hexastyle", p2);
-
- // wait for the cache size to drop to 1, up to a specified amount of time.
- long giveupTime = System.currentTimeMillis() + (1000 * 60); // 1 mins?
- while (cache.getAdvancedCache().getDataContainer().size() > 1 && System.currentTimeMillis() < giveupTime) {
+ // wait for the cache size to drop to CACHE_SIZE, up to a specified amount of time.
+ long giveupTime = System.currentTimeMillis() + (1000 * 10); // 10 sec
+ while (cache.getAdvancedCache().getDataContainer().size() > CACHE_SIZE && System.currentTimeMillis() < giveupTime) {
TestingUtil.sleepThread(100);
}
+ assert cache.getAdvancedCache().getDataContainer().size() <= CACHE_SIZE : "Expected 1, was " + cache.size();
+ //let eviction manager kick in
+ Util.sleep(3000);
MockMarshalledValueInterceptor interceptor = (MockMarshalledValueInterceptor) TestingUtil.findInterceptor(cache, MarshalledValueInterceptor.class);
assert !interceptor.marshalledValueCreated;
}
Modified: trunk/core/src/test/java/org/infinispan/stress/DataContainerStressTest.java
===================================================================
--- trunk/core/src/test/java/org/infinispan/stress/DataContainerStressTest.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/java/org/infinispan/stress/DataContainerStressTest.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -33,7 +33,7 @@
private static final Random R = new Random();
public void testSimpleDataContainer() throws InterruptedException {
- doTest(new SimpleDataContainer(5000));
+ doTest(DefaultDataContainer.unBoundedDataContainer(5000));
}
public void testFIFODataContainer() throws InterruptedException {
Modified: trunk/core/src/test/java/org/infinispan/stress/MapStressTest.java
===================================================================
--- trunk/core/src/test/java/org/infinispan/stress/MapStressTest.java 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/java/org/infinispan/stress/MapStressTest.java 2010-03-25 10:49:02 UTC (rev 1619)
@@ -8,12 +8,13 @@
import java.util.Map;
import java.util.Random;
import java.util.Map.Entry;
-import java.util.concurrent.ConcurrentHashMap;
+import org.infinispan.util.concurrent.BoundedConcurrentHashMap;
+import org.infinispan.util.concurrent.BoundedConcurrentHashMap.Eviction;
+
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
-import org.infinispan.util.concurrent.BufferedConcurrentHashMap;
-import org.infinispan.util.concurrent.BufferedConcurrentHashMap.Eviction;
+
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
@@ -52,15 +53,15 @@
}
public void testConcurrentHashMap() throws Exception {
- doTest(new ConcurrentHashMap<Integer, Integer>(MAP_CAPACITY, MAP_LOAD_FACTOR, CONCURRENCY));
+ doTest(new BoundedConcurrentHashMap<Integer, Integer>(MAP_CAPACITY, CONCURRENCY));
}
public void testBufferedConcurrentHashMapLRU() throws Exception {
- doTest(new BufferedConcurrentHashMap<Integer, Integer>(MAP_CAPACITY, MAP_LOAD_FACTOR, CONCURRENCY, Eviction.LRU));
+ doTest(new BoundedConcurrentHashMap<Integer, Integer>(MAP_CAPACITY, CONCURRENCY, Eviction.LRU));
}
public void testBufferedConcurrentHashMapLIRS() throws Exception {
- doTest(new BufferedConcurrentHashMap<Integer, Integer>(MAP_CAPACITY, MAP_LOAD_FACTOR, CONCURRENCY, Eviction.LIRS));
+ doTest(new BoundedConcurrentHashMap<Integer, Integer>(MAP_CAPACITY, CONCURRENCY, Eviction.LIRS));
}
public void testHashMap() throws Exception {
Modified: trunk/core/src/test/resources/configs/named-cache-test.xml
===================================================================
--- trunk/core/src/test/resources/configs/named-cache-test.xml 2010-03-24 11:05:42 UTC (rev 1618)
+++ trunk/core/src/test/resources/configs/named-cache-test.xml 2010-03-25 10:49:02 UTC (rev 1619)
@@ -129,7 +129,7 @@
Eviction configuration. WakeupInterval defines how often the eviction thread runs, in milliseconds. 0 means
the eviction thread will never run. A separate executor is used for eviction in each cache.
-->
- <eviction wakeUpInterval="500" maxEntries="5000" strategy="FIFO"/>
+ <eviction wakeUpInterval="500" maxEntries="5000" threadPolicy="PIGGYBACK" strategy="FIFO"/>
<expiration lifespan="60000" maxIdle="1000"/>
</namedCache>
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