Examples with ScheduledExecutorService java.util.concurrent.ScheduledExecutorService used on opensource projects

Example 1 with ScheduledExecutorService

use of java.util.concurrent.ScheduledExecutorService in project hive by apache.

the class ReplChangeManager method scheduleCMClearer.

// Schedule CMClearer thread. Will be invoked by metastore
public static void scheduleCMClearer(HiveConf hiveConf) {
    if (HiveConf.getBoolVar(hiveConf, HiveConf.ConfVars.REPLCMENABLED)) {
        ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor(new BasicThreadFactory.Builder().namingPattern("cmclearer-%d").daemon(true).build());
        executor.scheduleAtFixedRate(new CMClearer(hiveConf.get(HiveConf.ConfVars.REPLCMDIR.varname), hiveConf.getTimeVar(ConfVars.REPLCMRETIAN, TimeUnit.SECONDS), hiveConf), 0, hiveConf.getTimeVar(ConfVars.REPLCMINTERVAL, TimeUnit.SECONDS), TimeUnit.SECONDS);
    }
}

Example 2 with ScheduledExecutorService

use of java.util.concurrent.ScheduledExecutorService in project elasticsearch by elastic.

the class CacheTests method testDependentKeyDeadlock.

public void testDependentKeyDeadlock() throws BrokenBarrierException, InterruptedException {
    class Key {

        private final int key;

        Key(int key) {
            this.key = key;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o)
                return true;
            if (o == null || getClass() != o.getClass())
                return false;
            Key key1 = (Key) o;
            return key == key1.key;
        }

        @Override
        public int hashCode() {
            return key % 2;
        }
    }
    int numberOfThreads = randomIntBetween(2, 32);
    final Cache<Key, Integer> cache = CacheBuilder.<Key, Integer>builder().build();
    CopyOnWriteArrayList<ExecutionException> failures = new CopyOnWriteArrayList<>();
    CyclicBarrier barrier = new CyclicBarrier(1 + numberOfThreads);
    CountDownLatch deadlockLatch = new CountDownLatch(numberOfThreads);
    List<Thread> threads = new ArrayList<>();
    for (int i = 0; i < numberOfThreads; i++) {
        Thread thread = new Thread(() -> {
            try {
                try {
                    barrier.await();
                } catch (BrokenBarrierException | InterruptedException e) {
                    throw new AssertionError(e);
                }
                Random random = new Random(random().nextLong());
                for (int j = 0; j < numberOfEntries; j++) {
                    Key key = new Key(random.nextInt(numberOfEntries));
                    try {
                        cache.computeIfAbsent(key, k -> {
                            if (k.key == 0) {
                                return 0;
                            } else {
                                Integer value = cache.get(new Key(k.key / 2));
                                return value != null ? value : 0;
                            }
                        });
                    } catch (ExecutionException e) {
                        failures.add(e);
                        break;
                    }
                }
            } finally {
                // successfully avoided deadlock, release the main thread
                deadlockLatch.countDown();
            }
        });
        threads.add(thread);
        thread.start();
    }
    AtomicBoolean deadlock = new AtomicBoolean();
    assert !deadlock.get();
    // start a watchdog service
    ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
    scheduler.scheduleAtFixedRate(() -> {
        Set<Long> ids = threads.stream().map(t -> t.getId()).collect(Collectors.toSet());
        ThreadMXBean mxBean = ManagementFactory.getThreadMXBean();
        long[] deadlockedThreads = mxBean.findDeadlockedThreads();
        if (!deadlock.get() && deadlockedThreads != null) {
            for (long deadlockedThread : deadlockedThreads) {
                // ensure that we detected deadlock on our threads
                if (ids.contains(deadlockedThread)) {
                    deadlock.set(true);
                    // release the main test thread to fail the test
                    for (int i = 0; i < numberOfThreads; i++) {
                        deadlockLatch.countDown();
                    }
                    break;
                }
            }
        }
    }, 1, 1, TimeUnit.SECONDS);
    // everything is setup, release the hounds
    barrier.await();
    // wait for either deadlock to be detected or the threads to terminate
    deadlockLatch.await();
    // shutdown the watchdog service
    scheduler.shutdown();
    assertThat(failures, is(empty()));
    assertFalse("deadlock", deadlock.get());
}

Example 3 with ScheduledExecutorService

use of java.util.concurrent.ScheduledExecutorService in project mongo-java-driver by mongodb.

the class Mongo method createCursorCleaningService.

private ExecutorService createCursorCleaningService() {
    ScheduledExecutorService newTimer = Executors.newSingleThreadScheduledExecutor(new DaemonThreadFactory("CleanCursors"));
    newTimer.scheduleAtFixedRate(new Runnable() {

        @Override
        public void run() {
            cleanCursors();
        }
    }, 1, 1, SECONDS);
    return newTimer;
}

Example 4 with ScheduledExecutorService

use of java.util.concurrent.ScheduledExecutorService in project failsafe by jhalterman.

the class Java8Example method main.

@SuppressWarnings("unused")
public static void main(String... args) {
    ScheduledExecutorService executor = Executors.newScheduledThreadPool(2);
    RetryPolicy retryPolicy = new RetryPolicy();
    // Create a retryable functional interface
    Function<String, String> bar = value -> Failsafe.with(retryPolicy).get(() -> value + "bar");
    // Create a retryable runnable Stream
    Failsafe.with(retryPolicy).run(() -> Stream.of("foo").map(value -> value + "bar").forEach(System.out::println));
    // Create a retryable callable Stream
    Failsafe.with(retryPolicy).get(() -> Stream.of("foo").map(value -> Failsafe.with(retryPolicy).get(() -> value + "bar")).collect(Collectors.toList()));
    // Create a individual retryable Stream operation
    Stream.of("foo").map(value -> Failsafe.with(retryPolicy).get(() -> value + "bar")).forEach(System.out::println);
    // Create a retryable CompletableFuture
    Failsafe.with(retryPolicy).with(executor).future(() -> CompletableFuture.supplyAsync(() -> "foo").thenApplyAsync(value -> value + "bar").thenAccept(System.out::println));
    // Create an individual retryable CompletableFuture stages
    CompletableFuture.supplyAsync(() -> Failsafe.with(retryPolicy).get(() -> "foo")).thenApplyAsync(value -> Failsafe.with(retryPolicy).get(() -> value + "bar")).thenAccept(System.out::println);
}

Example 5 with ScheduledExecutorService

use of java.util.concurrent.ScheduledExecutorService in project failsafe by jhalterman.

the class AsyncFailsafeTest method shouldHandleInitialSchedulingFailure.

/**
   * Asserts that Failsafe handles an initial scheduling failure.
   */
public void shouldHandleInitialSchedulingFailure() throws Throwable {
    // Given
    ScheduledExecutorService executor = Executors.newScheduledThreadPool(0);
    executor.shutdownNow();
    Waiter waiter = new Waiter();
    // When
    @SuppressWarnings("unchecked") FailsafeFuture<Void> future = Failsafe.with(new RetryPolicy().retryWhen(null).retryOn(Exception.class)).with(executor).run(() -> waiter.fail("Should not execute callable since executor has been shutdown"));
    assertThrows(() -> future.get(), ExecutionException.class, RejectedExecutionException.class);
}