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From "Garrett Rooney" <roo...@electricjellyfish.net>
Subject Re: svn commit: r532373 - /incubator/abdera/java/trunk/core/src/main/java/org/apache/abdera/factory/ExtensionFactoryMap.java
Date Wed, 25 Apr 2007 15:07:12 GMT
On 4/25/07, jmsnell@apache.org <jmsnell@apache.org> wrote:
> Author: jmsnell
> Date: Wed Apr 25 07:46:17 2007
> New Revision: 532373
> URL: http://svn.apache.org/viewvc?view=rev&rev=532373
> Log:
> Second attempt at improving thread safety on ExtensionFactoryMap.  Wrap the weakhashmap
with a synchronized map and synchronize the
> iterations over the factories list

Other potential issues in this code WRT thread safety:

We don't make a defensive copy of the factories list when we're
created, so potentially someone else can synchronize on it, resulting
in deadlock.  Alternatively it could be modified without
synchronization after we're created, defeating the purpose of the
other locking we do.  Similarly, we return a reference to it in
getFactories(), with identical potential badness.

The first case can be dealt with via documentation if we don't want to
make a copy, but the second really seems like it should be dealt with
by making a copy of the list before returning it.


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