[jboss-user] [JBoss Cache: Core Edition] - Failure to configure a cache with a TimeToLive expiration
Using JBoss Cache 3.0.3-GA, I have not been able to configure a simple cache with a
"TimeToLive" expiration.
Firstly, whenever the eviction thread wakes up, a warning is logged:
anonymous wrote : WARN org.jboss.cache.eviction.ExpirationAlgorithm - No expiration key
'expiration' for Node: /
Secondly, no eviction is being performed.
The configuration is reproduced in this unit-test code (the production code has the cache
wired up using a Spring IOC context configuration):
| import static org.junit.Assert.assertEquals;
|
| import org.apache.log4j.Logger;
| import org.jboss.cache.Cache;
| import org.jboss.cache.DefaultCacheFactory;
| import org.jboss.cache.Node;
| import org.jboss.cache.config.Configuration;
| import org.jboss.cache.config.EvictionConfig;
| import org.jboss.cache.config.EvictionRegionConfig;
| import org.jboss.cache.eviction.ExpirationAlgorithmConfig;
| import org.junit.Test;
|
|
| public class TestJbossCacheConfig {
| private static final Logger logger =
Logger.getLogger(TestJbossCacheConfig.class);
| final Cache<String, String> cache;
| private final long TIME_TO_LIVE = 1000;
| private Node<String, String> root;
|
| public TestJbossCacheConfig() {
| ExpirationAlgorithmConfig eac = new ExpirationAlgorithmConfig();
| eac.setTimeToLive(TIME_TO_LIVE);
|
| EvictionRegionConfig erc = new EvictionRegionConfig();
| erc.setRegionName("/");
| erc.setEvictionAlgorithmConfig(eac);
|
| EvictionConfig ec = new EvictionConfig();
| ec.setWakeupInterval(TIME_TO_LIVE / 2); //msec
| ec.setDefaultEvictionRegionConfig(erc);
|
| Configuration config = new Configuration();
| config.setEvictionConfig(ec);
|
| cache = new DefaultCacheFactory<String, String>().createCache(config);
| root = cache.getRoot();
| }
|
|
| @Test
| //@Ignore
| public void testEviction() throws InterruptedException {
|
| root.put("1", "one");
| root.put("2", "two");
|
| assertEquals("one", root.get("1"));
|
| assertEquals(2, root.dataSize());
|
| logger.info("Sleeps while eviction kicks in");
| Thread.sleep(TIME_TO_LIVE * 2);
| /*
| * During sleep:
| * "WARN org.jboss.cache.eviction.ExpirationAlgorithm - No expiration
key 'expiration' for Node: /"
| */
|
| /*
| * java.lang.AssertionError: expected:<0> but was:<2>
| */
| assertEquals(0, root.dataSize());
| }
| }
What am I doing wrong here?
Another point: Although I know that JBoss cache is typically configured using an XML, or
an IOC framework, it seems a little excessive to require four levels of nested
configuration objects to configure a simple cache:
| configuration = new Configuration(new EvictionConfig(new EvictionRegionConfig(new
ExpirationAlgorithmConfig())))
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