I think I've alread fixed this in trunk - when dealing with add/removing
stuff I now do a block syncronisation on the pkgs instance. If that test
is clean, we should add it to the list of integration tests, to track
regressions.
Mark
Edson Tirelli wrote:
Dean
Thanks, we will investigate that asap.
[]s
Edson
2007/7/12, Dean Jones <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>:
Hi Edson,
On 7/12/07, Edson Tirelli <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
>
> Is it possible for you to provide a test case capable of
reproducing the
> problem?
>
I've written a quick test case, which is attached. When
numberOfThreads==1,
everything compiles okay. When numberOfThreads==100, I get function
compilation errors and CompileExceptions from mvel. Clearly there is
nothing shared between these threads as a new test class is created
per thread. If you synchronise the calls to addPackage() and
getPackage() using the class monitor i.e.
synchronized (DroolsLoadTest.class) {
builder.addPackage(packageDescr);
builder.getPackage();
}
then the problems go away. Hope this helps.
> At the same time, I would suggest you to not follow such
approach in your
> application. Compilation is an extremely heavy process and
should not be
> done for each request. The ideal approach is to pre-compile (for
instance,
> we have a contributed ant-task for that) and serialize your
rulebase to your
> database or filesystem, or at least, compile it only once and
cache it at
> runtime.
>
That's very sensible advice. Our situation is slightly different as
users are allowed to change the rules used by a running service,
so we
need to reflect any changes when a new request comes in. We are
planning to apply caching if performance is an issue, but we were
trying to assess performance of application under load when this
thread safety issue arose.
Thanks for your help,
Dean.
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Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
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