/**
* Cancels any construction threads. If background threads had been started for graph
* construction, they will be stopped and the construction abandoned. Note that this will also
* reset the number of additional threads to zero to prevent further threads from being started by
* the existing ones before they terminate. If a thread is already blocked in a call to {@link
* #getDependencyGraph} it will receive a {@link CancellationException} unless the graph
* construction completes before the cancellation is noted by that or other background threads.
* The cancellation is temporary, the additional threads can be reset afterwards for continued
* background building or a subsequent call to getDependencyGraph can finish the work.
*
* @param mayInterruptIfRunning ignored
* @return true if the build was cancelled
*/
@Override
public boolean cancel(final boolean mayInterruptIfRunning) {
setMaxAdditionalThreads(0);
synchronized (_activeJobs) {
_cancelled = true;
for (final Job job : _activeJobs) {
job.cancel(true);
}
_activeJobs.clear();
}
return true;
}
private static <T> boolean invokeConcurrentlyForAll(
@NotNull final List<? extends T> things,
boolean failFastOnAcquireReadAction,
@NotNull final Processor<T> thingProcessor)
throws ProcessCanceledException {
final Job<String> job = new JobImpl<String>(Job.DEFAULT_PRIORITY, failFastOnAcquireReadAction);
final int chunkSize = Math.max(1, things.size() / JobSchedulerImpl.CORES_COUNT / 20);
for (int i = 0; i < things.size(); i += chunkSize) {
// this job chunk is i..i+chunkSize-1
final int finalI = i;
job.addTask(
new Runnable() {
public void run() {
try {
for (int k = finalI; k < finalI + chunkSize && k < things.size(); k++) {
T thing = things.get(k);
if (!thingProcessor.process(thing)) {
job.cancel();
break;
}
}
} catch (ProcessCanceledException e) {
job.cancel();
throw e;
}
}
});
}
try {
job.scheduleAndWaitForResults();
} catch (RuntimeException e) {
job.cancel();
throw e;
} catch (Throwable throwable) {
job.cancel();
throw new ProcessCanceledException(throwable);
}
return !job.isCanceled();
}