Apparently I did something dumb. The fix that I'm really confident
about isn't in either CVS or SVN and also isn't in the last patch I
sent out.
But does it even exist, or did I dream the whole thing? It does exist!
I'm attaching 3 patches that should apply to the
latest CSV and should also fix the memory leak in a very simple and
non-intrusive way so as not to break Maven.
Over the weekend, I'll figure out how these changes relate to what's
in SVN, the patches may apply properly.
Hans
Index: 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
--- JellyContext.java 27 Jan 2005 05:52:27 -0000 1.66
+++ JellyContext.java 24 Mar 2005 05:31:20 -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: 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
--- TagScript.java 20 Jan 2005 05:18:56 -0000 1.50
+++ TagScript.java 24 Mar 2005 05:31:52 -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 +106,10 @@
/** the url of the script when parsed */
private URL scriptURL = null;
+
+ /** A synchronized WeakHashMap from the current Thread (key) to a Tag
object (value).
+ */
+ private Map threadLocalTagCache = Collections.synchronizedMap(new
WeakHashMap());
/**
* @return a new TagScript based on whether
@@ -286,11 +292,12 @@
* @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 +521,8 @@
* 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: 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
--- BaseMemoryLeakTest.java 20 Jan 2005 05:19:04 -0000 1.3
+++ BaseMemoryLeakTest.java 24 Mar 2005 05:32:27 -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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