test/tck/RecursiveTaskTest.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/licenses/publicdomain
 */

import junit.framework.*;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveTask;
import java.util.concurrent.TimeUnit;
import java.util.HashSet;

public class RecursiveTaskTest extends JSR166TestCase {

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(RecursiveTaskTest.class);
    }

    private static ForkJoinPool mainPool() {
        return new ForkJoinPool();
    }

    private static ForkJoinPool singletonPool() {
        return new ForkJoinPool(1);
    }

    private static ForkJoinPool asyncSingletonPool() {
        return new ForkJoinPool(1,
                                ForkJoinPool.defaultForkJoinWorkerThreadFactory,
                                null, true);
    }

    private <T> T testInvokeOnPool(ForkJoinPool pool, RecursiveTask<T> a) {
        try {
            assertFalse(a.isDone());
            assertFalse(a.isCompletedNormally());
            assertFalse(a.isCompletedAbnormally());
            assertFalse(a.isCancelled());

            T result = pool.invoke(a);

            assertTrue(a.isDone());
            assertTrue(a.isCompletedNormally());
            assertFalse(a.isCompletedAbnormally());
            assertFalse(a.isCancelled());
            assertNull(a.getException());
            return result;
        } finally {
            joinPool(pool);
        }
    }

    static final class FJException extends RuntimeException {
        FJException() { super(); }
    }

    // An invalid return value for Fib
    static final Integer NoResult = Integer.valueOf(-17);

    // A simple recursive task for testing
    final class FibTask extends CheckedRecursiveTask<Integer> {
        final int number;
        FibTask(int n) { number = n; }
        public Integer realCompute() {
            int n = number;
            if (n <= 1)
                return n;
            FibTask f1 = new FibTask(n - 1);
            f1.fork();
            return (new FibTask(n - 2)).compute() + f1.join();
        }
    }

    // A recursive action failing in base case
    final class FailingFibTask extends RecursiveTask<Integer> {
        final int number;
        int result;
        FailingFibTask(int n) { number = n; }
        public Integer compute() {
            int n = number;
            if (n <= 1)
                throw new FJException();
            FailingFibTask f1 = new FailingFibTask(n - 1);
            f1.fork();
            return (new FibTask(n - 2)).compute() + f1.join();
        }
    }

    /**
     * invoke returns value when task completes normally.
     * isCompletedAbnormally and isCancelled return false for normally
     * completed tasks. getRawResult of a completed non-null task
     * returns value;
     */
    public void testInvoke() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                Integer r = f.invoke();
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                assertFalse(f.isCancelled());
                assertFalse(f.isCompletedAbnormally());
                assertEquals(21, (int) f.getRawResult());
                return r;
            }};
        assertEquals(21, (int) testInvokeOnPool(mainPool(), a));
    }

    /**
     * quietlyInvoke task returns when task completes normally.
     * isCompletedAbnormally and isCancelled return false for normally
     * completed tasks
     */
    public void testQuietlyInvoke() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                f.quietlyInvoke();
                Integer r = f.getRawResult();
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                assertFalse(f.isCancelled());
                assertFalse(f.isCompletedAbnormally());
                return r;
            }};
        assertEquals(21, (int) testInvokeOnPool(mainPool(), a));
    }

    /**
     * join of a forked task returns when task completes
     */
    public void testForkJoin() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                Integer r = f.join();
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                return r;
            }};
        assertEquals(21, (int) testInvokeOnPool(mainPool(), a));
    }

    /**
     * get of a forked task returns when task completes
     */
    public void testForkGet() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() throws Exception {
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                Integer r = f.get();
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                return r;
            }};
        assertEquals(21, (int) testInvokeOnPool(mainPool(), a));
    }

    /**
     * timed get of a forked task returns when task completes
     */
    public void testForkTimedGet() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() throws Exception {
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                Integer r = f.get(5L, TimeUnit.SECONDS);
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                return r;
            }};
        assertEquals(21, (int) testInvokeOnPool(mainPool(), a));
    }

    /**
     * quietlyJoin of a forked task returns when task completes
     */
    public void testForkQuietlyJoin() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                f.quietlyJoin();
                Integer r = f.getRawResult();
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                return r;
            }};
        assertEquals(21, (int) testInvokeOnPool(mainPool(), a));
    }


    /**
     * helpQuiesce returns when tasks are complete.
     * getQueuedTaskCount returns 0 when quiescent
     */
    public void testForkHelpQuiesce() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                f.helpQuiesce();
                Integer r = f.getRawResult();
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                assertEquals(0, getQueuedTaskCount());
                return r;
            }};
        assertEquals(21, (int) testInvokeOnPool(mainPool(), a));
    }


    /**
     * invoke task throws exception when task completes abnormally
     */
    public void testAbnormalInvoke() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FailingFibTask f = new FailingFibTask(8);
                try {
                    f.invoke();
                    shouldThrow();
                    return NoResult;
                } catch (FJException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * quietlyInvoke task returns when task completes abnormally
     */
    public void testAbnormalQuietlyInvoke() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FailingFibTask f = new FailingFibTask(8);
                f.quietlyInvoke();
                assertTrue(f.isDone());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * join of a forked task throws exception when task completes abnormally
     */
    public void testAbnormalForkJoin() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FailingFibTask f = new FailingFibTask(8);
                assertSame(f, f.fork());
                try {
                    Integer r = f.join();
                    shouldThrow();
                    return r;
                } catch (FJException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * get of a forked task throws exception when task completes abnormally
     */
    public void testAbnormalForkGet() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() throws Exception {
                FailingFibTask f = new FailingFibTask(8);
                assertSame(f, f.fork());
                try {
                    Integer r = f.get();
                    shouldThrow();
                    return r;
                } catch (ExecutionException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * timed get of a forked task throws exception when task completes abnormally
     */
    public void testAbnormalForkTimedGet() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() throws Exception {
                FailingFibTask f = new FailingFibTask(8);
                assertSame(f, f.fork());
                try {
                    Integer r = f.get(5L, TimeUnit.SECONDS);
                    shouldThrow();
                    return r;
                } catch (ExecutionException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * quietlyJoin of a forked task returns when task completes abnormally
     */
    public void testAbnormalForkQuietlyJoin() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FailingFibTask f = new FailingFibTask(8);
                assertSame(f, f.fork());
                f.quietlyJoin();
                assertTrue(f.isDone());
                assertTrue(f.isCompletedAbnormally());
                assertTrue(f.getException() instanceof FJException);
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invoke task throws exception when task cancelled
     */
    public void testCancelledInvoke() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                assertTrue(f.cancel(true));
                try {
                    Integer r = f.invoke();
                    shouldThrow();
                    return r;
                } catch (CancellationException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * join of a forked task throws exception when task cancelled
     */
    public void testCancelledForkJoin() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                assertTrue(f.cancel(true));
                assertSame(f, f.fork());
                try {
                    Integer r = f.join();
                    shouldThrow();
                    return r;
                } catch (CancellationException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * get of a forked task throws exception when task cancelled
     */
    public void testCancelledForkGet() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() throws Exception {
                FibTask f = new FibTask(8);
                assertTrue(f.cancel(true));
                assertSame(f, f.fork());
                try {
                    Integer r = f.get();
                    shouldThrow();
                    return r;
                } catch (CancellationException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * timed get of a forked task throws exception when task cancelled
     */
    public void testCancelledForkTimedGet() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() throws Exception {
                FibTask f = new FibTask(8);
                assertTrue(f.cancel(true));
                assertSame(f, f.fork());
                try {
                    Integer r = f.get(5L, TimeUnit.SECONDS);
                    shouldThrow();
                    return r;
                } catch (CancellationException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * quietlyJoin of a forked task returns when task cancelled
     */
    public void testCancelledForkQuietlyJoin() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                assertTrue(f.cancel(true));
                assertSame(f, f.fork());
                f.quietlyJoin();
                assertTrue(f.isDone());
                assertTrue(f.isCompletedAbnormally());
                assertTrue(f.isCancelled());
                assertTrue(f.getException() instanceof CancellationException);
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * getPool of executing task returns its pool
     */
    public void testGetPool() {
        final ForkJoinPool mainPool = mainPool();
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                assertSame(mainPool, getPool());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool, a));
    }

    /**
     * getPool of non-FJ task returns null
     */
    public void testGetPool2() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                assertNull(getPool());
                return NoResult;
            }};
        assertSame(NoResult, a.invoke());
    }

    /**
     * inForkJoinPool of executing task returns true
     */
    public void testInForkJoinPool() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                assertTrue(inForkJoinPool());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * inForkJoinPool of non-FJ task returns false
     */
    public void testInForkJoinPool2() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                assertTrue(!inForkJoinPool());
                return NoResult;
            }};
        assertSame(NoResult, a.invoke());
    }

    /**
     * The value set by setRawResult is returned by getRawResult
     */
    public void testSetRawResult() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                setRawResult(NoResult);
                assertSame(NoResult, getRawResult());
                return NoResult;
            }
        };
        a.invoke();
    }

    /**
     * A reinitialized task may be re-invoked
     */
    public void testReinitialize() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                Integer r = f.invoke();
                assertEquals(21, (int) r);
                assertTrue(f.isDone());
                assertFalse(f.isCancelled());
                assertFalse(f.isCompletedAbnormally());
                f.reinitialize();
                r = f.invoke();
                assertEquals(21, (int) r);
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invoke task throws exception after invoking completeExceptionally
     */
    public void testCompleteExceptionally() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                f.completeExceptionally(new FJException());
                try {
                    Integer r = f.invoke();
                    shouldThrow();
                    return r;
                } catch (FJException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invoke task suppresses execution invoking complete
     */
    public void testComplete() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                f.complete(NoResult);
                Integer r = f.invoke();
                assertTrue(f.isDone());
                assertSame(NoResult, r);
                return r;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invokeAll(t1, t2) invokes all task arguments
     */
    public void testInvokeAll2() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                FibTask g = new FibTask(9);
                invokeAll(f, g);
                assertTrue(f.isDone());
                assertEquals(21, (int) f.join());
                assertTrue(g.isDone());
                assertEquals(34, (int) g.join());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invokeAll(tasks) with 1 argument invokes task
     */
    public void testInvokeAll1() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                invokeAll(f);
                assertTrue(f.isDone());
                assertEquals(21, (int) f.join());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invokeAll(tasks) with > 2 argument invokes tasks
     */
    public void testInvokeAll3() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                FibTask g = new FibTask(9);
                FibTask h = new FibTask(7);
                invokeAll(f, g, h);
                assertTrue(f.isDone());
                assertEquals(21, (int) f.join());
                assertTrue(g.isDone());
                assertEquals(34, (int) g.join());
                assertTrue(h.isDone());
                assertEquals(13, (int) h.join());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invokeAll(collection) invokes all tasks in the collection
     */
    public void testInvokeAllCollection() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                FibTask g = new FibTask(9);
                FibTask h = new FibTask(7);
                HashSet set = new HashSet();
                set.add(f);
                set.add(g);
                set.add(h);
                invokeAll(set);
                assertTrue(f.isDone());
                assertEquals(21, (int) f.join());
                assertTrue(g.isDone());
                assertEquals(34, (int) g.join());
                assertTrue(h.isDone());
                assertEquals(13, (int) h.join());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }


    /**
     * invokeAll(t1, t2) throw exception if any task does
     */
    public void testAbnormalInvokeAll2() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                FailingFibTask g = new FailingFibTask(9);
                try {
                    invokeAll(f, g);
                    shouldThrow();
                    return NoResult;
                } catch (FJException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invokeAll(tasks) with 1 argument throws exception if task does
     */
    public void testAbnormalInvokeAll1() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FailingFibTask g = new FailingFibTask(9);
                try {
                    invokeAll(g);
                    shouldThrow();
                    return NoResult;
                } catch (FJException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invokeAll(tasks) with > 2 argument throws exception if any task does
     */
    public void testAbnormalInvokeAll3() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask f = new FibTask(8);
                FailingFibTask g = new FailingFibTask(9);
                FibTask h = new FibTask(7);
                try {
                    invokeAll(f, g, h);
                    shouldThrow();
                    return NoResult;
                } catch (FJException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * invokeAll(collection) throws exception if any task does
     */
    public void testAbnormalInvokeAllCollection() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FailingFibTask f = new FailingFibTask(8);
                FibTask g = new FibTask(9);
                FibTask h = new FibTask(7);
                HashSet set = new HashSet();
                set.add(f);
                set.add(g);
                set.add(h);
                try {
                    invokeAll(set);
                    shouldThrow();
                    return NoResult;
                } catch (FJException success) {}
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(mainPool(), a));
    }

    /**
     * tryUnfork returns true for most recent unexecuted task,
     * and suppresses execution
     */
    public void testTryUnfork() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertTrue(f.tryUnfork());
                helpQuiesce();
                assertFalse(f.isDone());
                assertTrue(g.isDone());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(singletonPool(), a));
    }

    /**
     * getSurplusQueuedTaskCount returns > 0 when
     * there are more tasks than threads
     */
    public void testGetSurplusQueuedTaskCount() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask h = new FibTask(7);
                assertSame(h, h.fork());
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertTrue(getSurplusQueuedTaskCount() > 0);
                helpQuiesce();
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(singletonPool(), a));
    }

    /**
     * peekNextLocalTask returns most recent unexecuted task.
     */
    public void testPeekNextLocalTask() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertSame(f, peekNextLocalTask());
                assertEquals(21, (int) f.join());
                assertTrue(f.isDone());
                helpQuiesce();
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(singletonPool(), a));
    }

    /**
     * pollNextLocalTask returns most recent unexecuted task
     * without executing it
     */
    public void testPollNextLocalTask() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertSame(f, pollNextLocalTask());
                helpQuiesce();
                assertFalse(f.isDone());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(singletonPool(), a));
    }

    /**
     * pollTask returns an unexecuted task without executing it
     */
    public void testPollTask() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertSame(f, pollTask());
                helpQuiesce();
                assertFalse(f.isDone());
                assertTrue(g.isDone());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(singletonPool(), a));
    }

    /**
     * peekNextLocalTask returns least recent unexecuted task in async mode
     */
    public void testPeekNextLocalTaskAsync() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertSame(g, peekNextLocalTask());
                assertEquals(21, (int) f.join());
                helpQuiesce();
                assertTrue(f.isDone());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(asyncSingletonPool(), a));
    }

    /**
     * pollNextLocalTask returns least recent unexecuted task
     * without executing it, in async mode
     */
    public void testPollNextLocalTaskAsync() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertSame(g, pollNextLocalTask());
                helpQuiesce();
                assertTrue(f.isDone());
                assertFalse(g.isDone());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(asyncSingletonPool(), a));
    }

    /**
     * pollTask returns an unexecuted task
     * without executing it, in async mode
     */
    public void testPollTaskAsync() {
        RecursiveTask<Integer> a = new CheckedRecursiveTask<Integer>() {
            public Integer realCompute() {
                FibTask g = new FibTask(9);
                assertSame(g, g.fork());
                FibTask f = new FibTask(8);
                assertSame(f, f.fork());
                assertSame(g, pollTask());
                helpQuiesce();
                assertTrue(f.isDone());
                assertFalse(g.isDone());
                return NoResult;
            }};
        assertSame(NoResult, testInvokeOnPool(asyncSingletonPool(), a));
    }

}
Revision:	1.19
Committed:	Thu Sep 16 00:52:49 2010 UTC (13 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.18:	+297 -356 lines
Log Message:	testcase hygiene: introduce CheckedRecursiveAction and CheckedRecursiveTask; eliminate almost all threadAssertXXX; use preferred junit conventions;narrow the scope of exception checking code; make sure test failures in non-junit threads produce proper stacktraces