Examples with ForkJoinTask java8.util.concurrent.ForkJoinTask used on opensource projects

Example 6 with ForkJoinTask

use of java8.util.concurrent.ForkJoinTask in project streamsupport by stefan-zobel.

the class ForkJoinTaskTest method testAbnormalInvokeAllCollectionSingleton.

/**
 * invokeAll(collection) throws exception if any task does
 */
public void testAbnormalInvokeAllCollectionSingleton() {
    @SuppressWarnings("serial") RecursiveAction a = new CheckedRecursiveAction() {

        protected void realCompute() {
            FailingAsyncFib f = new FailingAsyncFib(8);
            AsyncFib g = new AsyncFib(9);
            AsyncFib h = new AsyncFib(7);
            ForkJoinTask<?>[] tasks = { f, g, h };
            shuffle(tasks);
            try {
                invokeAll(Arrays.asList(tasks));
                shouldThrow();
            } catch (FJException success) {
                checkCompletedAbnormally(f, success);
            }
        }
    };
    testInvokeOnPool(singletonPool(), a);
}

Example 7 with ForkJoinTask

use of java8.util.concurrent.ForkJoinTask in project streamsupport by stefan-zobel.

the class ForkJoinTaskTest method testAbnormalInvokeAll3Singleton.

/**
 * invokeAll(tasks) with > 2 argument throws exception if any task does
 */
public void testAbnormalInvokeAll3Singleton() {
    @SuppressWarnings("serial") RecursiveAction a = new CheckedRecursiveAction() {

        protected void realCompute() {
            AsyncFib f = new AsyncFib(8);
            FailingAsyncFib g = new FailingAsyncFib(9);
            AsyncFib h = new AsyncFib(7);
            ForkJoinTask<?>[] tasks = { f, g, h };
            shuffle(tasks);
            try {
                invokeAll(tasks);
                shouldThrow();
            } catch (FJException success) {
                checkCompletedAbnormally(g, success);
            }
        }
    };
    testInvokeOnPool(singletonPool(), a);
}

Example 8 with ForkJoinTask

use of java8.util.concurrent.ForkJoinTask in project streamsupport by stefan-zobel.

the class ForkJoinPool8Test method testAwaitQuiescence2.

/**
 * awaitQuiescence returns when pool isQuiescent() or the indicated
 * timeout elapsed
 */
public void testAwaitQuiescence2() throws Exception {
    /**
     * """It is possible to disable or limit the use of threads in the
     * common pool by setting the parallelism property to zero. However
     * doing so may cause unjoined tasks to never be executed."""
     */
    if ("0".equals(System.getProperty("java.util.concurrent.ForkJoinPool.common.parallelism")))
        return;
    final ForkJoinPool p = new ForkJoinPool();
    PoolCleaner cleaner = null;
    try {
        cleaner = cleaner(p);
        assertTrue(p.isQuiescent());
        final long startTime = System.nanoTime();
        @SuppressWarnings("serial") ForkJoinTask<?> a = new CheckedRecursiveAction() {

            protected void realCompute() {
                FibAction f = new FibAction(8);
                assertSame(f, f.fork());
                while (!f.isDone() && millisElapsedSince(startTime) < LONG_DELAY_MS) {
                    assertFalse(p.getAsyncMode());
                    assertFalse(p.isShutdown());
                    assertFalse(p.isTerminating());
                    assertFalse(p.isTerminated());
                    Thread.yield();
                }
                assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
                assertEquals(0, ForkJoinTask.getQueuedTaskCount());
                assertEquals(21, f.result);
            }
        };
        p.execute(a);
        assertTrue(p.awaitQuiescence(LONG_DELAY_MS, MILLISECONDS));
        assertTrue(p.isQuiescent());
        assertTrue(a.isDone());
        assertEquals(0, p.getQueuedTaskCount());
        assertFalse(p.getAsyncMode());
        assertEquals(0, p.getQueuedSubmissionCount());
        assertFalse(p.hasQueuedSubmissions());
        while (p.getActiveThreadCount() != 0 && millisElapsedSince(startTime) < LONG_DELAY_MS) Thread.yield();
        assertFalse(p.isShutdown());
        assertFalse(p.isTerminating());
        assertFalse(p.isTerminated());
        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
    } finally {
        if (cleaner != null) {
            cleaner.close();
        }
    }
}

Example 9 with ForkJoinTask

use of java8.util.concurrent.ForkJoinTask in project streamsupport by stefan-zobel.

the class ForkJoinPool8Test method testAwaitQuiescence1.

/**
 * awaitQuiescence by a worker is equivalent in effect to
 * ForkJoinTask.helpQuiesce()
 */
public void testAwaitQuiescence1() throws Exception {
    final ForkJoinPool p = new ForkJoinPool();
    PoolCleaner cleaner = null;
    try {
        cleaner = cleaner(p);
        final long startTime = System.nanoTime();
        assertTrue(p.isQuiescent());
        @SuppressWarnings("serial") ForkJoinTask<?> a = new CheckedRecursiveAction() {

            protected void realCompute() {
                FibAction f = new FibAction(8);
                assertSame(f, f.fork());
                assertSame(p, ForkJoinTask.getPool());
                boolean quiescent = p.awaitQuiescence(LONG_DELAY_MS, MILLISECONDS);
                assertTrue(quiescent);
                assertFalse(p.isQuiescent());
                while (!f.isDone()) {
                    assertFalse(p.getAsyncMode());
                    assertFalse(p.isShutdown());
                    assertFalse(p.isTerminating());
                    assertFalse(p.isTerminated());
                    Thread.yield();
                }
                assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
                assertFalse(p.isQuiescent());
                assertEquals(0, ForkJoinTask.getQueuedTaskCount());
                assertEquals(21, f.result);
            }
        };
        p.execute(a);
        while (!a.isDone() || !p.isQuiescent()) {
            assertFalse(p.getAsyncMode());
            assertFalse(p.isShutdown());
            assertFalse(p.isTerminating());
            assertFalse(p.isTerminated());
            Thread.yield();
        }
        assertEquals(0, p.getQueuedTaskCount());
        assertFalse(p.getAsyncMode());
        assertEquals(0, p.getQueuedSubmissionCount());
        assertFalse(p.hasQueuedSubmissions());
        while (p.getActiveThreadCount() != 0 && millisElapsedSince(startTime) < LONG_DELAY_MS) Thread.yield();
        assertFalse(p.isShutdown());
        assertFalse(p.isTerminating());
        assertFalse(p.isTerminated());
        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
    } finally {
        if (cleaner != null) {
            cleaner.close();
        }
    }
}

Example 10 with ForkJoinTask

use of java8.util.concurrent.ForkJoinTask in project streamsupport by stefan-zobel.

the class ForkJoinPoolTest method testBlockingForkJoinTask.

/**
 * Pool maintains parallelism when using ManagedBlocker
 */
public void testBlockingForkJoinTask() throws Throwable {
    ForkJoinPool p = new ForkJoinPool(4);
    try {
        ReentrantLock lock = new ReentrantLock();
        ManagedLocker locker = new ManagedLocker(lock);
        ForkJoinTask<Integer> f = new LockingFibTask(20, locker, lock);
        p.execute(f);
        assertEquals(6765, (int) f.get());
    } finally {
        // don't wait out shutdown
        p.shutdownNow();
    }
}