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From Brian McCallister <>
Subject Re: java.util.concurrent
Date Thu, 01 Jun 2006 01:45:54 GMT

On May 31, 2006, at 6:36 PM, Abe White wrote:

> To that end, I spent a little time recently investigating  
> concurrency in the Kodo codebase.  I've only gone over the "lib"  
> code (basically the stuff that's checked into OpenJPA), but it  
> turns out that with a few of the java.util.concurrent classes, we  
> could get rid of almost all synchronization.  Unfortunately, the  
> java.util.concurrent package is 1.5-only, and even the available  
> backport is 1.4 code ( 
> util-concurrent/).  The backport is public domain, and it would be  
> trivial to alter the few classes we need (ConcurrentHashMap,  
> CopyOnWriteArrayList, CopyOnWriteArraySet) to be 1.4-compatible and  
> check them in as OpenJPA utils (well actually Kodo utils, but  
> OpenJPA utils when we synch the codebases).  Before I do that,  
> however, I'm wondering if  anyone has other suggestions.  Perhaps  
> there is already code out there I don't know about.

Doug Lea's original concurrency utils ( 
classes/EDU/oswego/cs/dl/util/concurrent/intro.html ) are very good  
in jdk 1.4/1.3.


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