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https://issues.apache.org/jira/browse/FELIX-338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12519986
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Felix Meschberger commented on FELIX-338:
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I have to admit, that I never touched ThreadLocals myself upto now. But It
seems to be the best of all possibilities to fix the issues.
On the other hand, looking at the code, it seems like the Evaluator basically
just ist a single method whose only data modified during evaluation is the
operand stack. So, I assume, the Evaluator.evaluate(Mapper) method might just
as well be copied to the FilterImpl class and the operand stack a variable
local to the method - this stack would be recreated on each call (instead of
the Evaluator) and need not be cleared at the end, as this is left to the GC.
The other object - the mapper - is just a facade to the actual data being used
for filter matching.
So besides just not reusing the instances, I would also redo the implementation.
> Framework FilterImpl is not thread safe on execution
> ----------------------------------------------------
>
> Key: FELIX-338
> URL: https://issues.apache.org/jira/browse/FELIX-338
> Project: Felix
> Issue Type: Bug
> Components: Framework
> Affects Versions: 0.8.0, 1.0.0
> Reporter: Felix Meschberger
> Attachments: filter.patch
>
>
> Executing a Filter implemented by the Felix Framework FilterImpl class is not
> thread safe, as the Filter.Implmatch() methods are not synchronized but use a
> Mapper and Evaluator instance fields which are modified while matching the
> filter.
> Two options seem to exist:
> 1. Make the match() methods synchronized
> 2. Create Mapper and Evaluator instances on each match() call
> My assumption is that the second method tends to be better because of the
> synchronization needed with the first approach.
> Reported by Tom Remoleur, thanks. The full mail thread leading to this issue
> may be found at [1].
> [1] http://www.mail-archive.com/[EMAIL PROTECTED]/msg00145.html
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