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https://issues.apache.org/jira/browse/TAP5-2546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948475#comment-15948475
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Jochen Kemnade commented on TAP5-2546:
--------------------------------------
The fix should work, but I wonder why the methods are synchronized at all. It
was done for TAP5-1650, I'm trying to find out what the actual issue was.
> Parallel class loading
> ----------------------
>
> Key: TAP5-2546
> URL: https://issues.apache.org/jira/browse/TAP5-2546
> Project: Tapestry 5
> Issue Type: Sub-task
> Components: plastic
> Reporter: Michael Mikhulya
>
> I would like to improve page loading time by improving its concurrent
> execution.
> Here is a first patch related to it: TAP5-2545
> Now the worst place from lock contention point of view is synchronization on
> {{PlasticClassLoader}}. Actually there are two kind of synchronization:
> {{synchronized}} methods in {{PlasticClassLoader}} and {{synchronized
> (loader)}} sections in {{PlasticClassPool}}.
> Recently most class loaders added support for parallel class loading:
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=464442
> https://bz.apache.org/bugzilla/show_bug.cgi?id=57681
> If we would like to split global lock, then we can use following trick for it.
> We can substitute code like this:
> {code:title=PlasticClassLoader.java}
> public synchronized Class<?> defineClassWithBytecode(String className,
> byte[] bytecode)
> {
> return defineClass(className, bytecode, 0, bytecode.length);
> }
> {code}
> with following one:
> {code:java}
> public Class<?> defineClassWithBytecode(String className, byte[] bytecode)
> {
> synchronized (className.intern())
> {
> return defineClass(className, bytecode, 0, bytecode.length);
> }
> }
> {code}
> It is just an idea to quickly check solution.
> Can anybody check and discuss idea? Or even better to fix issue. :-)
> I'm not an expert in concurrency and afraid making changes in such a critical
> place at least before somebody reviewed my idea. So any feedback would be
> appreciated.
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