Here’s a patch for HEAD with a thread-safe cache that’s
got no JellyContext tag cache, no memory leak and no dumb WeakReferences. And
it even passes the unit tests. It’s so simple that it was invisible; it’s less
than 10 lines of change from the pre-RC1 TagScript. Sigh. Anyway, I didn’t want to commit it because we already have
consensus on the tag cache. Could everyone test with this one too? If it works, I’ll
commit it. Hans |
Index: src/java/org/apache/commons/jelly/JellyContext.java =================================================================== RCS file: /home/cvs/jakarta-commons/jelly/src/java/org/apache/commons/jelly/JellyContext.java,v retrieving revision 1.66 diff -u -r1.66 JellyContext.java --- src/java/org/apache/commons/jelly/JellyContext.java 27 Jan 2005 05:52:27 -0000 1.66 +++ src/java/org/apache/commons/jelly/JellyContext.java 27 Jan 2005 06:11:11 -0000 @@ -92,20 +92,6 @@ /** Should we export tag libraries to our parents context */ private boolean exportLibraries = true; - /** Maps a Thread to its local Script data cache. It's - * like a ThreadLocal, but it reclaims memory better - * when the JellyCointext goes out of scope. - * This isn't a ThreadLocal because of the typical usage scenario of - * JellyContext. ThreadLocal is meant to be sued as a static variable, - * we were using it as a local variable. - * [EMAIL PROTECTED] #setThreadLocalScriptData(Script,Object)} - */ - private Map threadLocalScriptData = Collections.synchronizedMap(new WeakHashMap()); - // THINKME: Script objects are like Object (for equals and hashCode) I think. - // It should be asy to optimize hash-map distribution, e.g. by - // shifting the hashcode return value (presuming Object.hashcode() - // is something like an address) - /** * Create a new context with the currentURL set to the rootURL */ @@ -390,93 +376,20 @@ return createChildContext(); } - - /** Gets the Script data item that may have previously been stored - * by the script, in this context, for the current thread. - * - * @return the tag associated with the current context and thread - */ - public Object getThreadScriptData(Script script) { - if( script == null ) - return null; - Tag tag = (Tag) getThreadScriptDataMap().get(script); - if( tag == null && getParent() != null) { - return getParent().getThreadScriptData(script); - } else { - return tag; - } - } - - /** Gets a per-thread (thread local) Map of data for use by - * Scripts. - * @return the thread local Map of Script data */ - public Map getThreadScriptDataMap() { - Map rv; - Thread t = Thread.currentThread(); - Map data = (Map) threadLocalScriptData.get(t); - if (data == null) { - rv = new HashMap(); - threadLocalScriptData.put(t, rv); - } else { - rv = data; - } - return rv; - } - - /** Stores an object that lasts for the life of this context - * and is local to the current thread. This method is - * mainly intended to store Tag instances. However, any - * Script that wants to cache data can use this - * method. - */ - public void setThreadScriptData(Script script, Object data) { - getThreadScriptDataMap().put(script,data); - } - - /** Clears variables set by Tags (basically, variables set in a Jelly script) - * and data stored by [EMAIL PROTECTED] Script} instances. + /** Clears variables set by Tags. * @see #clearVariables() - * @see #clearThreadScriptData() - * @see #clearScriptData() */ public void clear() { - clearScriptData(); clearVariables(); } /** Clears variables set by Tags (variables set while running a Jelly script) * @see #clear() - * @see #clearThreadScriptData() - * @see #clearScriptData() */ - public void clearVariables() { + protected void clearVariables() { variables.clear(); } - /** Clears data cached by [EMAIL PROTECTED] Script} instances, - * for this context, <strong>for the current thread</strong>. - * The data cleared could be cached Tag instances or other data - * saved by Script classes. - * @see #clear() - * @see #clearVariables() - * @see #clearScriptData() - */ - public void clearThreadScriptData() { - getThreadScriptDataMap().clear(); - } - - /** Clears data cached by [EMAIL PROTECTED] Script} instances, - * for this context, <strong>for all threads</strong>. - * The data cleared could be cached Tag instances or other data - * saved by Script classes. - * @see #clear() - * @see #clearThreadScriptData() - * @see #clearVariables() - */ - public void clearScriptData() { - threadLocalScriptData.clear(); - } - /** Registers the given tag library against the given namespace URI. * This should be called before the parser is used. */ Index: src/java/org/apache/commons/jelly/impl/TagScript.java =================================================================== RCS file: /home/cvs/jakarta-commons/jelly/src/java/org/apache/commons/jelly/impl/TagScript.java,v retrieving revision 1.50 diff -u -r1.50 TagScript.java --- src/java/org/apache/commons/jelly/impl/TagScript.java 20 Jan 2005 05:18:56 -0000 1.50 +++ src/java/org/apache/commons/jelly/impl/TagScript.java 27 Jan 2005 06:11:11 -0000 @@ -19,9 +19,11 @@ import java.lang.reflect.InvocationTargetException; import java.net.MalformedURLException; import java.net.URL; +import java.util.Collections; import java.util.Hashtable; import java.util.Iterator; import java.util.Map; +import java.util.WeakHashMap; import org.apache.commons.beanutils.ConvertingWrapDynaBean; import org.apache.commons.beanutils.ConvertUtils; @@ -104,6 +106,8 @@ /** the url of the script when parsed */ private URL scriptURL = null; + + private Map threadLocalTagCache = Collections.synchronizedMap(new WeakHashMap()); /** * @return a new TagScript based on whether @@ -286,11 +290,12 @@ * @return the tag to be evaluated, creating it lazily if required. */ public Tag getTag(JellyContext context) throws JellyException { - Tag tag = (Tag) context.getThreadScriptData(this); + Thread t = Thread.currentThread(); + Tag tag = (Tag) threadLocalTagCache.get(t); if ( tag == null ) { tag = createTag(); if ( tag != null ) { - context.setThreadScriptData(this,tag); + threadLocalTagCache.put(t,tag); configureTag(tag,context); } } @@ -514,7 +519,8 @@ * when a StaticTag is switched with a DynamicTag */ protected void setTag(Tag tag, JellyContext context) { - context.setThreadScriptData(this,tag); + Thread t = Thread.currentThread(); + threadLocalTagCache.put(t,tag); } /** Index: src/test/org/apache/commons/jelly/core/BaseMemoryLeakTest.java =================================================================== RCS file: /home/cvs/jakarta-commons/jelly/src/test/org/apache/commons/jelly/core/BaseMemoryLeakTest.java,v retrieving revision 1.3 diff -u -r1.3 BaseMemoryLeakTest.java --- src/test/org/apache/commons/jelly/core/BaseMemoryLeakTest.java 20 Jan 2005 05:19:04 -0000 1.3 +++ src/test/org/apache/commons/jelly/core/BaseMemoryLeakTest.java 27 Jan 2005 06:11:11 -0000 @@ -130,7 +130,6 @@ rt.runFinalization(); rt.gc(); long middle = rt.totalMemory() - rt.freeMemory(); - log.info("TagHolderMap has " + jc.getThreadScriptDataMap().size() + " entries."); log.info("Memory test after " + i + " runs: " + (middle - start)); }
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