java - How to find the number of runnables waiting to be executed -

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is there way know @ given point in time how many runnables waiting executed executorservice. example, assuming loop invoking execute method faster runnable can complete , surplus accumulates, there anyway running count of accumulated runnables?

executorservice es = executors.newfixedthreadpool(50);  while (test) {     es.execute(new myrunnable()); }

is there way know @ given point in time how many runnables waiting executed executorservice.

yes. instead of using executors... calls, should instantiate own threadpoolexecutor. below executors.newfixedthreadpool(50) returning:

threadpoolexecutor threadpool = new threadpoolexecutor(50, 50,            0l, timeunit.milliseconds, new linkedblockingqueue<runnable>());

once have threadpoolexecutor, has number of getter methods give data on pool. number of outstanding jobs should be:

threadpool.getqueue().getsize();

also available threadpoolexecutor are:

  • getactivecount()
  • getcompletedtaskcount()
  • getcorepoolsize()
  • getlargestpoolsize()
  • getmaximumpoolsize()
  • getpoolsize()
  • gettaskcount()

if want throttle number of jobs in queue don't far ahead, should use bounded blockingqueue , rejectedexecutionhandler. see answer here: process large file http calls in java


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