Hi everybody, I'm not quite sure whether InheritableThreadLocal works for PooledExecutors with pre-forked Threads. Because afai understand InheritableThreadLocal shares the context with the creating thread but that must not be the thread that issues a runnable into a PoolExecutor. But as I said, I'm not quite sure. --- Ceki Gulcu <listid@qos.ch> schrieb:
Hi Peter,
Java offers the notion of "inheritable thread local" data which would take conveying MDC data to child threads. There is even a bug report on this issue:
http://bugzilla.qos.ch/show_bug.cgi?id=64
Would the solution described in bug 64 (above) work for you?
Cheers,
peter huber wrote:
Hi LogBack-Team,
just want to tell you that MDC lacks thread support. But I'm quite sure that you know that. As soon as you "leave" a thread the MDC conext (ThreadLocal) will be lost. I had implemented something similar to MDC a while ago and I accompanied my impl with a ContextPreservingRunnable after a while.
Works like this
CTOR (Source Thread): ContextPreservingRunnable(Runnable inSubject) { myMemento = MDC.getMemento(); mySubject = inSubject; }
RUN-Method (Target Thread): void run() { MDC.setMemento(myMemento); mySubject.run(); MDC.clear(); }
Even though it works for me, it's rather bad that you have to wrap all Runnables and Callables respectively.
Maybe a ExecutorFacade might server the purpose?
BTW: Does MDC include support for a Subjects Principals (JAAS)...Please forgive me my showing off at dev list;-)
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