How to use

ExecutorAllCompletionService

in

org.infinispan.executors

@Override
public void process(final KeyFilter filter, final CacheLoaderTask task, Executor executor, boolean fetchValue, boolean fetchMetadata) {
 scanForUnknownDirectories();
 ExecutorAllCompletionService eacs = new ExecutorAllCompletionService(executor);
   eacs.submit(new Callable<Void>() {
    @Override
    public Void call() throws Exception {
 eacs.waitUntilAllCompleted();
 if (eacs.isExceptionThrown()) {
   throw new PersistenceException("Execution exception!", eacs.getFirstException());

public void testExceptions() {
 ExecutorAllCompletionService service = createService(1);
 service.submit(new WaitRunnable(1), null);
 service.submit(new ExceptionRunnable("second"), null);
 service.submit(new WaitRunnable(1), null);
 service.submit(new ExceptionRunnable("third"), null);
 service.waitUntilAllCompleted();
 assertTrue(service.isAllCompleted());
 assertTrue(service.isExceptionThrown());
 assertEquals("second", findCause(service.getFirstException()).getMessage());
}

private ExecutorAllCompletionService createService(int maxThreads) {
 if (lastExecutorService != null) {
   lastExecutorService.shutdownNow();
 }
 lastExecutorService = Executors.newFixedThreadPool(maxThreads, getTestThreadFactory("Worker"));
 return new ExecutorAllCompletionService(lastExecutorService);
}

eacs.submit(new Runnable() {
  @Override
  public void run() {

@Override
public void process(final KeyFilter filter, final CacheLoaderTask task, Executor executor, boolean fetchValue, boolean fetchMetadata) {
 scanForUnknownDirectories();
 ExecutorAllCompletionService eacs = new ExecutorAllCompletionService(executor);
   eacs.submit(new Callable<Void>() {
    @Override
    public Void call() throws Exception {
 eacs.waitUntilAllCompleted();
 if (eacs.isExceptionThrown()) {
   throw new PersistenceException("Execution exception!", eacs.getFirstException());

public void testWaitForAll() {
 ExecutorAllCompletionService service = createService(1);
 long before = System.currentTimeMillis();
 service.submit(new WaitRunnable(500), null);
 service.submit(new WaitRunnable(500), null);
 service.waitUntilAllCompleted();
 long after = System.currentTimeMillis();
 assertTrue(after - before >= 1000);
 assertTrue(service.isAllCompleted());
 assertFalse(service.isExceptionThrown());
}

  return;
ExecutorAllCompletionService eacs = new ExecutorAllCompletionService(threadPool);
EntityManager emStream = emf.createEntityManager();
try {
  emStream.close();
eacs.waitUntilAllCompleted();
if (eacs.isExceptionThrown()) {
  throw new JpaStoreException(eacs.getFirstException());

public void testParallelWait() throws InterruptedException {
 final ExecutorAllCompletionService service = createService(2);
 for (int i = 0; i < 300; ++i) {
   service.submit(new WaitRunnable(10), null);
 }
 List<Thread> threads = new ArrayList<>(10);
 for (int i = 0; i < 10; ++i) {
   Thread t = new Thread(() -> {
    service.waitUntilAllCompleted();
    assertTrue(service.isAllCompleted());
    assertFalse(service.isExceptionThrown());
   });
   threads.add(t);
   t.start();
 }
 for (Thread t : threads) {
   t.join();
 }
 assertTrue(service.isAllCompleted());
 assertFalse(service.isExceptionThrown());
}

public void testParallelException() throws InterruptedException {
 final ExecutorAllCompletionService service = createService(2);
 for (int i = 0; i < 150; ++i) {
   service.submit(new WaitRunnable(10), null);
 }
 service.submit(new ExceptionRunnable("foobar"), null);
 for (int i = 0; i < 150; ++i) {
   service.submit(new WaitRunnable(10), null);
 }
 List<Thread> threads = new ArrayList<>(10);
 for (int i = 0; i < 10; ++i) {
   Thread t = new Thread(() -> {
    service.waitUntilAllCompleted();
    assertTrue(service.isAllCompleted());
    assertTrue(service.isExceptionThrown());
   });
   threads.add(t);
   t.start();
 }
 for (Thread t : threads) {
   t.join();
 }
 assertTrue(service.isAllCompleted());
 assertTrue(service.isExceptionThrown());
}