[jboss-dev-forums] [Design the new POJO MicroContainer] - Missing element in WeakRefVFSCache
Just something I noticed, which I didn't expect.
I'm running JBossAS with WeakRefVFSCache:
-Djboss.vfs.cache=org.jboss.virtual.plugins.cache.WeakRefVFSCache
Hence every VFSContext that doesn't have strong ref should be GCed.
In order to prevent some of them from being GCed too soon,
I've added the following bean:
| public class PreInitializeVFSContexts
| {
| private Logger log = Logger.getLogger(PreInitializeVFSContexts.class);
| private List<URL> initializedVFSContexts;
| private boolean holdReference;
| private List<VFS> references;
|
| /**
| * Start initializer.
| *
| * @throws Exception for any exception
| */
| public void start() throws Exception
| {
| if (initializedVFSContexts != null && initializedVFSContexts.isEmpty()
== false)
| {
| if (holdReference)
| references = new ArrayList<VFS>();
|
| for (URL url : initializedVFSContexts)
| {
| VFS vfs = VFS.getVFS(url);
| log.debug("Initialized Virtual File: " + vfs.getRoot());
| if (holdReference)
| {
| references.add(vfs);
| }
| }
| }
| }
|
| /**
| * Clear possible references.
| */
| public void stop()
| {
| if (references != null)
| references.clear();
| }
|
| /**
| * Get VFS references.
| *
| * @return the VFS references
| */
| public List<VFS> getReferences()
| {
| return references;
| }
|
| /**
| * Set URLs that need to be initialized before anything else.
| *
| * @param initializedVFSContexts the URLs to be initialized
| */
| public void setInitializedVFSContexts(List<URL> initializedVFSContexts)
| {
| this.initializedVFSContexts = initializedVFSContexts;
| }
|
| /**
| * Should we hold the reference to initialized VFSs.
| *
| * @param holdReference the hold reference flag
| */
| public void setHoldReference(boolean holdReference)
| {
| this.holdReference = holdReference;
| }
| }
|
So, if you mark this bean as holdReference, it's gonna put VFS into List,
hence keeping the strong ref; VFS --> VFSContext
See JBossAS/initialize.xml:
| <bean name="JBossVFSInitializer"
class="org.jboss.virtual.plugins.cache.PreInitializeVFSContexts">
| <property name="initializedVFSContexts">
| <list elementClass="java.net.URL">
| <value>${jboss.lib.url}</value>
| <value>${jboss.shared.lib.url}</value>
| <value>${jboss.server.lib.url}</value>
| </list>
| </property>
| <property name="holdReference">true</property>
| </bean>
|
But when inspecting jmx-console VFSCacheStatistics,
I'm missing jboss.server.lib.url (it's real value) in VFSContext list.
Where did I go wrong? :-)
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