/** * Cancels and clears the queue of all tasks that should not be run due to shutdown policy. * Invoked within super.shutdown. */ @Override void onShutdown() { BlockingQueue<Runnable> q = super.getQueue(); boolean keepDelayed = getExecuteExistingDelayedTasksAfterShutdownPolicy(); boolean keepPeriodic = getContinueExistingPeriodicTasksAfterShutdownPolicy(); if (!keepDelayed && !keepPeriodic) { for (Object e : q.toArray()) if (e instanceof RunnableScheduledFuture<?>) ((RunnableScheduledFuture<?>) e).cancel(false); q.clear(); } else { // Traverse snapshot to avoid iterator exceptions for (Object e : q.toArray()) { if (e instanceof RunnableScheduledFuture) { RunnableScheduledFuture<?> t = (RunnableScheduledFuture<?>) e; if ((t.isPeriodic() ? !keepPeriodic : !keepDelayed) || t.isCancelled()) { // also remove if already cancelled if (q.remove(t)) t.cancel(false); } } } } tryTerminate(); }