+
+ public Future<Void> tryFinishProcessing() {
+ executorService = Executors.newSingleThreadScheduledExecutor();
+ final SettableFuture<Void> settableFuture = SettableFuture.create();
+
+ scheduledFuture = executorService.scheduleAtFixedRate(new CheckFinishedTask(settableFuture), 0, 1, TimeUnit.SECONDS);
+ return settableFuture;
+ }
+
+ private class CheckFinishedTask implements Runnable {
+
+ private final SettableFuture<Void> future;
+
+ public CheckFinishedTask(final SettableFuture<Void> future) {
+ this.future = future;
+ }
+
+ @Override
+ public void run() {
+ if (System.nanoTime() - lastNotifTimestamp.get() > SECOND_AS_NANO * 4) {
+ scheduledFuture.cancel(false);
+ future.set(null);
+
+ executorService.shutdown();
+ }
+ }
+ }