test/tck/SynchronousQueueTest.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/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.SynchronousQueue;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

public class SynchronousQueueTest extends JSR166TestCase {

    public static class Fair extends BlockingQueueTest {
        protected BlockingQueue emptyCollection() {
            return new SynchronousQueue(true);
        }
    }

    public static class NonFair extends BlockingQueueTest {
        protected BlockingQueue emptyCollection() {
            return new SynchronousQueue(false);
        }
    }

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }

    public static Test suite() {
        return newTestSuite(SynchronousQueueTest.class,
                            new Fair().testSuite(),
                            new NonFair().testSuite());
    }

    /**
     * Any SynchronousQueue is both empty and full
     */
    public void testEmptyFull()      { testEmptyFull(false); }
    public void testEmptyFull_fair() { testEmptyFull(true); }
    public void testEmptyFull(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        assertEquals(0, q.remainingCapacity());
        assertFalse(q.offer(zero));
    }

    /**
     * offer fails if no active taker
     */
    public void testOffer()      { testOffer(false); }
    public void testOffer_fair() { testOffer(true); }
    public void testOffer(boolean fair) {
        SynchronousQueue q = new SynchronousQueue(fair);
        assertFalse(q.offer(one));
    }

    /**
     * add throws IllegalStateException if no active taker
     */
    public void testAdd()      { testAdd(false); }
    public void testAdd_fair() { testAdd(true); }
    public void testAdd(boolean fair) {
        SynchronousQueue q = new SynchronousQueue(fair);
        assertEquals(0, q.remainingCapacity());
        try {
            q.add(one);
            shouldThrow();
        } catch (IllegalStateException success) {}
    }

    /**
     * addAll(this) throws IllegalArgumentException
     */
    public void testAddAll_self()      { testAddAll_self(false); }
    public void testAddAll_self_fair() { testAddAll_self(true); }
    public void testAddAll_self(boolean fair) {
        SynchronousQueue q = new SynchronousQueue(fair);
        try {
            q.addAll(q);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * addAll throws ISE if no active taker
     */
    public void testAddAll_ISE()      { testAddAll_ISE(false); }
    public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
    public void testAddAll_ISE(boolean fair) {
        SynchronousQueue q = new SynchronousQueue(fair);
        Integer[] ints = new Integer[1];
        for (int i = 0; i < ints.length; i++)
            ints[i] = i;
        Collection<Integer> coll = Arrays.asList(ints);
        try {
            q.addAll(coll);
            shouldThrow();
        } catch (IllegalStateException success) {}
    }

    /**
     * put blocks interruptibly if no active taker
     */
    public void testBlockingPut()      { testBlockingPut(false); }
    public void testBlockingPut_fair() { testBlockingPut(true); }
    public void testBlockingPut(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                Thread.currentThread().interrupt();
                try {
                    q.put(99);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());

                pleaseInterrupt.countDown();
                try {
                    q.put(99);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());
            }});

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
        assertEquals(0, q.remainingCapacity());
    }

    /**
     * put blocks interruptibly waiting for take
     */
    public void testPutWithTake()      { testPutWithTake(false); }
    public void testPutWithTake_fair() { testPutWithTake(true); }
    public void testPutWithTake(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        final CountDownLatch pleaseTake = new CountDownLatch(1);
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                pleaseTake.countDown();
                q.put(one);

                pleaseInterrupt.countDown();
                try {
                    q.put(99);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());
            }});

        await(pleaseTake);
        assertEquals(0, q.remainingCapacity());
        try { assertSame(one, q.take()); }
        catch (InterruptedException e) { threadUnexpectedException(e); }

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
        assertEquals(0, q.remainingCapacity());
    }

    /**
     * timed offer times out if elements not taken
     */
    public void testTimedOffer()      { testTimedOffer(false); }
    public void testTimedOffer_fair() { testTimedOffer(true); }
    public void testTimedOffer(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                long startTime = System.nanoTime();
                assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
                pleaseInterrupt.countDown();
                try {
                    q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {}
            }});

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
    }

    /**
     * poll return null if no active putter
     */
    public void testPoll()      { testPoll(false); }
    public void testPoll_fair() { testPoll(true); }
    public void testPoll(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        assertNull(q.poll());
    }

    /**
     * timed poll with zero timeout times out if no active putter
     */
    public void testTimedPoll0()      { testTimedPoll0(false); }
    public void testTimedPoll0_fair() { testTimedPoll0(true); }
    public void testTimedPoll0(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        try { assertNull(q.poll(0, MILLISECONDS)); }
        catch (InterruptedException e) { threadUnexpectedException(e); }
    }

    /**
     * timed poll with nonzero timeout times out if no active putter
     */
    public void testTimedPoll()      { testTimedPoll(false); }
    public void testTimedPoll_fair() { testTimedPoll(true); }
    public void testTimedPoll(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        long startTime = System.nanoTime();
        try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
        catch (InterruptedException e) { threadUnexpectedException(e); }
        assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
    }

    /**
     * timed poll before a delayed offer times out, returning null;
     * after offer succeeds; on interruption throws
     */
    public void testTimedPollWithOffer()      { testTimedPollWithOffer(false); }
    public void testTimedPollWithOffer_fair() { testTimedPollWithOffer(true); }
    public void testTimedPollWithOffer(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        final CountDownLatch pleaseOffer = new CountDownLatch(1);
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                long startTime = System.nanoTime();
                assertNull(q.poll(timeoutMillis(), MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) >= timeoutMillis());

                pleaseOffer.countDown();
                startTime = System.nanoTime();
                assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS);

                Thread.currentThread().interrupt();
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());

                pleaseInterrupt.countDown();
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());
            }});

        await(pleaseOffer);
        long startTime = System.nanoTime();
        try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
        catch (InterruptedException e) { threadUnexpectedException(e); }
        assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS);

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
    }

    /**
     * peek() returns null if no active putter
     */
    public void testPeek()      { testPeek(false); }
    public void testPeek_fair() { testPeek(true); }
    public void testPeek(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        assertNull(q.peek());
    }

    /**
     * element() throws NoSuchElementException if no active putter
     */
    public void testElement()      { testElement(false); }
    public void testElement_fair() { testElement(true); }
    public void testElement(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        try {
            q.element();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * remove() throws NoSuchElementException if no active putter
     */
    public void testRemove()      { testRemove(false); }
    public void testRemove_fair() { testRemove(true); }
    public void testRemove(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        try {
            q.remove();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * contains returns false
     */
    public void testContains()      { testContains(false); }
    public void testContains_fair() { testContains(true); }
    public void testContains(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        assertFalse(q.contains(zero));
    }

    /**
     * clear ensures isEmpty
     */
    public void testClear()      { testClear(false); }
    public void testClear_fair() { testClear(true); }
    public void testClear(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        q.clear();
        assertTrue(q.isEmpty());
    }

    /**
     * containsAll returns false unless empty
     */
    public void testContainsAll()      { testContainsAll(false); }
    public void testContainsAll_fair() { testContainsAll(true); }
    public void testContainsAll(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        Integer[] empty = new Integer[0];
        assertTrue(q.containsAll(Arrays.asList(empty)));
        Integer[] ints = new Integer[1]; ints[0] = zero;
        assertFalse(q.containsAll(Arrays.asList(ints)));
    }

    /**
     * retainAll returns false
     */
    public void testRetainAll()      { testRetainAll(false); }
    public void testRetainAll_fair() { testRetainAll(true); }
    public void testRetainAll(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        Integer[] empty = new Integer[0];
        assertFalse(q.retainAll(Arrays.asList(empty)));
        Integer[] ints = new Integer[1]; ints[0] = zero;
        assertFalse(q.retainAll(Arrays.asList(ints)));
    }

    /**
     * removeAll returns false
     */
    public void testRemoveAll()      { testRemoveAll(false); }
    public void testRemoveAll_fair() { testRemoveAll(true); }
    public void testRemoveAll(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        Integer[] empty = new Integer[0];
        assertFalse(q.removeAll(Arrays.asList(empty)));
        Integer[] ints = new Integer[1]; ints[0] = zero;
        assertFalse(q.containsAll(Arrays.asList(ints)));
    }

    /**
     * toArray is empty
     */
    public void testToArray()      { testToArray(false); }
    public void testToArray_fair() { testToArray(true); }
    public void testToArray(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        Object[] o = q.toArray();
        assertEquals(0, o.length);
    }

    /**
     * toArray(Integer array) returns its argument with the first
     * element (if present) nulled out
     */
    public void testToArray2()      { testToArray2(false); }
    public void testToArray2_fair() { testToArray2(true); }
    public void testToArray2(boolean fair) {
        final SynchronousQueue<Integer> q
            = new SynchronousQueue<Integer>(fair);
        Integer[] a;

        a = new Integer[0];
        assertSame(a, q.toArray(a));

        a = new Integer[3];
        Arrays.fill(a, 42);
        assertSame(a, q.toArray(a));
        assertNull(a[0]);
        for (int i = 1; i < a.length; i++)
            assertEquals(42, (int) a[i]);
    }

    /**
     * toArray(null) throws NPE
     */
    public void testToArray_null()      { testToArray_null(false); }
    public void testToArray_null_fair() { testToArray_null(true); }
    public void testToArray_null(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        try {
            Object o[] = q.toArray(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * iterator does not traverse any elements
     */
    public void testIterator()      { testIterator(false); }
    public void testIterator_fair() { testIterator(true); }
    public void testIterator(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        Iterator it = q.iterator();
        assertFalse(it.hasNext());
        try {
            Object x = it.next();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * iterator remove throws ISE
     */
    public void testIteratorRemove()      { testIteratorRemove(false); }
    public void testIteratorRemove_fair() { testIteratorRemove(true); }
    public void testIteratorRemove(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        Iterator it = q.iterator();
        try {
            it.remove();
            shouldThrow();
        } catch (IllegalStateException success) {}
    }

    /**
     * toString returns a non-null string
     */
    public void testToString()      { testToString(false); }
    public void testToString_fair() { testToString(true); }
    public void testToString(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        String s = q.toString();
        assertNotNull(s);
    }

    /**
     * offer transfers elements across Executor tasks
     */
    public void testOfferInExecutor()      { testOfferInExecutor(false); }
    public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
    public void testOfferInExecutor(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        ExecutorService executor = Executors.newFixedThreadPool(2);
        final CheckedBarrier threadsStarted = new CheckedBarrier(2);

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                assertFalse(q.offer(one));
                threadsStarted.await();
                assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
                assertEquals(0, q.remainingCapacity());
            }});

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                threadsStarted.await();
                assertSame(one, q.take());
            }});

        joinPool(executor);
    }

    /**
     * timed poll retrieves elements across Executor threads
     */
    public void testPollInExecutor()      { testPollInExecutor(false); }
    public void testPollInExecutor_fair() { testPollInExecutor(true); }
    public void testPollInExecutor(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        final CheckedBarrier threadsStarted = new CheckedBarrier(2);
        ExecutorService executor = Executors.newFixedThreadPool(2);
        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                assertNull(q.poll());
                threadsStarted.await();
                assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
                assertTrue(q.isEmpty());
            }});

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                threadsStarted.await();
                q.put(one);
            }});

        joinPool(executor);
    }

    /**
     * a deserialized serialized queue is usable
     */
    public void testSerialization() {
        final SynchronousQueue x = new SynchronousQueue();
        final SynchronousQueue y = new SynchronousQueue(false);
        final SynchronousQueue z = new SynchronousQueue(true);
        assertSerialEquals(x, y);
        assertNotSerialEquals(x, z);
        SynchronousQueue[] qs = { x, y, z };
        for (SynchronousQueue q : qs) {
            SynchronousQueue clone = serialClone(q);
            assertNotSame(q, clone);
            assertSerialEquals(q, clone);
            assertTrue(clone.isEmpty());
            assertEquals(0, clone.size());
            assertEquals(0, clone.remainingCapacity());
            assertFalse(clone.offer(zero));
        }
    }

    /**
     * drainTo(c) of empty queue doesn't transfer elements
     */
    public void testDrainTo()      { testDrainTo(false); }
    public void testDrainTo_fair() { testDrainTo(true); }
    public void testDrainTo(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        ArrayList l = new ArrayList();
        q.drainTo(l);
        assertEquals(0, q.size());
        assertEquals(0, l.size());
    }

    /**
     * drainTo empties queue, unblocking a waiting put.
     */
    public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
    public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
    public void testDrainToWithActivePut(boolean fair) {
        final SynchronousQueue q = new SynchronousQueue(fair);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                q.put(one);
            }});

        ArrayList l = new ArrayList();
        long startTime = System.nanoTime();
        while (l.isEmpty()) {
            q.drainTo(l);
            if (millisElapsedSince(startTime) > LONG_DELAY_MS)
                fail("timed out");
            Thread.yield();
        }
        assertTrue(l.size() == 1);
        assertSame(one, l.get(0));
        awaitTermination(t);
    }

    /**
     * drainTo(c, n) empties up to n elements of queue into c
     */
    public void testDrainToN() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t1 = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                q.put(one);
            }});

        Thread t2 = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                q.put(two);
            }});

        ArrayList l = new ArrayList();
        delay(SHORT_DELAY_MS);
        q.drainTo(l, 1);
        assertEquals(1, l.size());
        q.drainTo(l, 1);
        assertEquals(2, l.size());
        assertTrue(l.contains(one));
        assertTrue(l.contains(two));
        awaitTermination(t1);
        awaitTermination(t2);
    }

    /**
     * remove(null), contains(null) always return false
     */
    public void testNeverContainsNull() {
        Collection<?> q = new SynchronousQueue();
        assertFalse(q.contains(null));
        assertFalse(q.remove(null));
    }

}
Revision:	1.43
Committed:	Wed Dec 31 16:44:02 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.42:	+0 -1 lines
Log Message:	remove unused imports
#	Content
1	/*
2	* Written by Doug Lea with assistance from members of JCP JSR-166
3	* Expert Group and released to the public domain, as explained at
4	* http://creativecommons.org/publicdomain/zero/1.0/
5	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import junit.framework.*;
10	import java.util.Arrays;
11	import java.util.ArrayList;
12	import java.util.Collection;
13	import java.util.Iterator;
14	import java.util.NoSuchElementException;
15	import java.util.concurrent.BlockingQueue;
16	import java.util.concurrent.CountDownLatch;
17	import java.util.concurrent.Executors;
18	import java.util.concurrent.ExecutorService;
19	import java.util.concurrent.SynchronousQueue;
20	import static java.util.concurrent.TimeUnit.MILLISECONDS;
21
22	public class SynchronousQueueTest extends JSR166TestCase {
23
24	public static class Fair extends BlockingQueueTest {
25	protected BlockingQueue emptyCollection() {
26	return new SynchronousQueue(true);
27	}
28	}
29
30	public static class NonFair extends BlockingQueueTest {
31	protected BlockingQueue emptyCollection() {
32	return new SynchronousQueue(false);
33	}
34	}
35
36	public static void main(String[] args) {
37	junit.textui.TestRunner.run(suite());
38	}
39
40	public static Test suite() {
41	return newTestSuite(SynchronousQueueTest.class,
42	new Fair().testSuite(),
43	new NonFair().testSuite());
44	}
45
46	/**
47	* Any SynchronousQueue is both empty and full
48	*/
49	public void testEmptyFull() { testEmptyFull(false); }
50	public void testEmptyFull_fair() { testEmptyFull(true); }
51	public void testEmptyFull(boolean fair) {
52	final SynchronousQueue q = new SynchronousQueue(fair);
53	assertTrue(q.isEmpty());
54	assertEquals(0, q.size());
55	assertEquals(0, q.remainingCapacity());
56	assertFalse(q.offer(zero));
57	}
58
59	/**
60	* offer fails if no active taker
61	*/
62	public void testOffer() { testOffer(false); }
63	public void testOffer_fair() { testOffer(true); }
64	public void testOffer(boolean fair) {
65	SynchronousQueue q = new SynchronousQueue(fair);
66	assertFalse(q.offer(one));
67	}
68
69	/**
70	* add throws IllegalStateException if no active taker
71	*/
72	public void testAdd() { testAdd(false); }
73	public void testAdd_fair() { testAdd(true); }
74	public void testAdd(boolean fair) {
75	SynchronousQueue q = new SynchronousQueue(fair);
76	assertEquals(0, q.remainingCapacity());
77	try {
78	q.add(one);
79	shouldThrow();
80	} catch (IllegalStateException success) {}
81	}
82
83	/**
84	* addAll(this) throws IllegalArgumentException
85	*/
86	public void testAddAll_self() { testAddAll_self(false); }
87	public void testAddAll_self_fair() { testAddAll_self(true); }
88	public void testAddAll_self(boolean fair) {
89	SynchronousQueue q = new SynchronousQueue(fair);
90	try {
91	q.addAll(q);
92	shouldThrow();
93	} catch (IllegalArgumentException success) {}
94	}
95
96	/**
97	* addAll throws ISE if no active taker
98	*/
99	public void testAddAll_ISE() { testAddAll_ISE(false); }
100	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
101	public void testAddAll_ISE(boolean fair) {
102	SynchronousQueue q = new SynchronousQueue(fair);
103	Integer[] ints = new Integer[1];
104	for (int i = 0; i < ints.length; i++)
105	ints[i] = i;
106	Collection<Integer> coll = Arrays.asList(ints);
107	try {
108	q.addAll(coll);
109	shouldThrow();
110	} catch (IllegalStateException success) {}
111	}
112
113	/**
114	* put blocks interruptibly if no active taker
115	*/
116	public void testBlockingPut() { testBlockingPut(false); }
117	public void testBlockingPut_fair() { testBlockingPut(true); }
118	public void testBlockingPut(boolean fair) {
119	final SynchronousQueue q = new SynchronousQueue(fair);
120	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
121	Thread t = newStartedThread(new CheckedRunnable() {
122	public void realRun() throws InterruptedException {
123	Thread.currentThread().interrupt();
124	try {
125	q.put(99);
126	shouldThrow();
127	} catch (InterruptedException success) {}
128	assertFalse(Thread.interrupted());
129
130	pleaseInterrupt.countDown();
131	try {
132	q.put(99);
133	shouldThrow();
134	} catch (InterruptedException success) {}
135	assertFalse(Thread.interrupted());
136	}});
137
138	await(pleaseInterrupt);
139	assertThreadStaysAlive(t);
140	t.interrupt();
141	awaitTermination(t);
142	assertEquals(0, q.remainingCapacity());
143	}
144
145	/**
146	* put blocks interruptibly waiting for take
147	*/
148	public void testPutWithTake() { testPutWithTake(false); }
149	public void testPutWithTake_fair() { testPutWithTake(true); }
150	public void testPutWithTake(boolean fair) {
151	final SynchronousQueue q = new SynchronousQueue(fair);
152	final CountDownLatch pleaseTake = new CountDownLatch(1);
153	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
154	Thread t = newStartedThread(new CheckedRunnable() {
155	public void realRun() throws InterruptedException {
156	pleaseTake.countDown();
157	q.put(one);
158
159	pleaseInterrupt.countDown();
160	try {
161	q.put(99);
162	shouldThrow();
163	} catch (InterruptedException success) {}
164	assertFalse(Thread.interrupted());
165	}});
166
167	await(pleaseTake);
168	assertEquals(0, q.remainingCapacity());
169	try { assertSame(one, q.take()); }
170	catch (InterruptedException e) { threadUnexpectedException(e); }
171
172	await(pleaseInterrupt);
173	assertThreadStaysAlive(t);
174	t.interrupt();
175	awaitTermination(t);
176	assertEquals(0, q.remainingCapacity());
177	}
178
179	/**
180	* timed offer times out if elements not taken
181	*/
182	public void testTimedOffer() { testTimedOffer(false); }
183	public void testTimedOffer_fair() { testTimedOffer(true); }
184	public void testTimedOffer(boolean fair) {
185	final SynchronousQueue q = new SynchronousQueue(fair);
186	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
187	Thread t = newStartedThread(new CheckedRunnable() {
188	public void realRun() throws InterruptedException {
189	long startTime = System.nanoTime();
190	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
191	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
192	pleaseInterrupt.countDown();
193	try {
194	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
195	shouldThrow();
196	} catch (InterruptedException success) {}
197	}});
198
199	await(pleaseInterrupt);
200	assertThreadStaysAlive(t);
201	t.interrupt();
202	awaitTermination(t);
203	}
204
205	/**
206	* poll return null if no active putter
207	*/
208	public void testPoll() { testPoll(false); }
209	public void testPoll_fair() { testPoll(true); }
210	public void testPoll(boolean fair) {
211	final SynchronousQueue q = new SynchronousQueue(fair);
212	assertNull(q.poll());
213	}
214
215	/**
216	* timed poll with zero timeout times out if no active putter
217	*/
218	public void testTimedPoll0() { testTimedPoll0(false); }
219	public void testTimedPoll0_fair() { testTimedPoll0(true); }
220	public void testTimedPoll0(boolean fair) {
221	final SynchronousQueue q = new SynchronousQueue(fair);
222	try { assertNull(q.poll(0, MILLISECONDS)); }
223	catch (InterruptedException e) { threadUnexpectedException(e); }
224	}
225
226	/**
227	* timed poll with nonzero timeout times out if no active putter
228	*/
229	public void testTimedPoll() { testTimedPoll(false); }
230	public void testTimedPoll_fair() { testTimedPoll(true); }
231	public void testTimedPoll(boolean fair) {
232	final SynchronousQueue q = new SynchronousQueue(fair);
233	long startTime = System.nanoTime();
234	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
235	catch (InterruptedException e) { threadUnexpectedException(e); }
236	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
237	}
238
239	/**
240	* timed poll before a delayed offer times out, returning null;
241	* after offer succeeds; on interruption throws
242	*/
243	public void testTimedPollWithOffer() { testTimedPollWithOffer(false); }
244	public void testTimedPollWithOffer_fair() { testTimedPollWithOffer(true); }
245	public void testTimedPollWithOffer(boolean fair) {
246	final SynchronousQueue q = new SynchronousQueue(fair);
247	final CountDownLatch pleaseOffer = new CountDownLatch(1);
248	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
249	Thread t = newStartedThread(new CheckedRunnable() {
250	public void realRun() throws InterruptedException {
251	long startTime = System.nanoTime();
252	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
253	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
254
255	pleaseOffer.countDown();
256	startTime = System.nanoTime();
257	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
258	assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS);
259
260	Thread.currentThread().interrupt();
261	try {
262	q.poll(LONG_DELAY_MS, MILLISECONDS);
263	shouldThrow();
264	} catch (InterruptedException success) {}
265	assertFalse(Thread.interrupted());
266
267	pleaseInterrupt.countDown();
268	try {
269	q.poll(LONG_DELAY_MS, MILLISECONDS);
270	shouldThrow();
271	} catch (InterruptedException success) {}
272	assertFalse(Thread.interrupted());
273	}});
274
275	await(pleaseOffer);
276	long startTime = System.nanoTime();
277	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
278	catch (InterruptedException e) { threadUnexpectedException(e); }
279	assertTrue(millisElapsedSince(startTime) < MEDIUM_DELAY_MS);
280
281	await(pleaseInterrupt);
282	assertThreadStaysAlive(t);
283	t.interrupt();
284	awaitTermination(t);
285	}
286
287	/**
288	* peek() returns null if no active putter
289	*/
290	public void testPeek() { testPeek(false); }
291	public void testPeek_fair() { testPeek(true); }
292	public void testPeek(boolean fair) {
293	final SynchronousQueue q = new SynchronousQueue(fair);
294	assertNull(q.peek());
295	}
296
297	/**
298	* element() throws NoSuchElementException if no active putter
299	*/
300	public void testElement() { testElement(false); }
301	public void testElement_fair() { testElement(true); }
302	public void testElement(boolean fair) {
303	final SynchronousQueue q = new SynchronousQueue(fair);
304	try {
305	q.element();
306	shouldThrow();
307	} catch (NoSuchElementException success) {}
308	}
309
310	/**
311	* remove() throws NoSuchElementException if no active putter
312	*/
313	public void testRemove() { testRemove(false); }
314	public void testRemove_fair() { testRemove(true); }
315	public void testRemove(boolean fair) {
316	final SynchronousQueue q = new SynchronousQueue(fair);
317	try {
318	q.remove();
319	shouldThrow();
320	} catch (NoSuchElementException success) {}
321	}
322
323	/**
324	* contains returns false
325	*/
326	public void testContains() { testContains(false); }
327	public void testContains_fair() { testContains(true); }
328	public void testContains(boolean fair) {
329	final SynchronousQueue q = new SynchronousQueue(fair);
330	assertFalse(q.contains(zero));
331	}
332
333	/**
334	* clear ensures isEmpty
335	*/
336	public void testClear() { testClear(false); }
337	public void testClear_fair() { testClear(true); }
338	public void testClear(boolean fair) {
339	final SynchronousQueue q = new SynchronousQueue(fair);
340	q.clear();
341	assertTrue(q.isEmpty());
342	}
343
344	/**
345	* containsAll returns false unless empty
346	*/
347	public void testContainsAll() { testContainsAll(false); }
348	public void testContainsAll_fair() { testContainsAll(true); }
349	public void testContainsAll(boolean fair) {
350	final SynchronousQueue q = new SynchronousQueue(fair);
351	Integer[] empty = new Integer[0];
352	assertTrue(q.containsAll(Arrays.asList(empty)));
353	Integer[] ints = new Integer[1]; ints[0] = zero;
354	assertFalse(q.containsAll(Arrays.asList(ints)));
355	}
356
357	/**
358	* retainAll returns false
359	*/
360	public void testRetainAll() { testRetainAll(false); }
361	public void testRetainAll_fair() { testRetainAll(true); }
362	public void testRetainAll(boolean fair) {
363	final SynchronousQueue q = new SynchronousQueue(fair);
364	Integer[] empty = new Integer[0];
365	assertFalse(q.retainAll(Arrays.asList(empty)));
366	Integer[] ints = new Integer[1]; ints[0] = zero;
367	assertFalse(q.retainAll(Arrays.asList(ints)));
368	}
369
370	/**
371	* removeAll returns false
372	*/
373	public void testRemoveAll() { testRemoveAll(false); }
374	public void testRemoveAll_fair() { testRemoveAll(true); }
375	public void testRemoveAll(boolean fair) {
376	final SynchronousQueue q = new SynchronousQueue(fair);
377	Integer[] empty = new Integer[0];
378	assertFalse(q.removeAll(Arrays.asList(empty)));
379	Integer[] ints = new Integer[1]; ints[0] = zero;
380	assertFalse(q.containsAll(Arrays.asList(ints)));
381	}
382
383	/**
384	* toArray is empty
385	*/
386	public void testToArray() { testToArray(false); }
387	public void testToArray_fair() { testToArray(true); }
388	public void testToArray(boolean fair) {
389	final SynchronousQueue q = new SynchronousQueue(fair);
390	Object[] o = q.toArray();
391	assertEquals(0, o.length);
392	}
393
394	/**
395	* toArray(Integer array) returns its argument with the first
396	* element (if present) nulled out
397	*/
398	public void testToArray2() { testToArray2(false); }
399	public void testToArray2_fair() { testToArray2(true); }
400	public void testToArray2(boolean fair) {
401	final SynchronousQueue<Integer> q
402	= new SynchronousQueue<Integer>(fair);
403	Integer[] a;
404
405	a = new Integer[0];
406	assertSame(a, q.toArray(a));
407
408	a = new Integer[3];
409	Arrays.fill(a, 42);
410	assertSame(a, q.toArray(a));
411	assertNull(a[0]);
412	for (int i = 1; i < a.length; i++)
413	assertEquals(42, (int) a[i]);
414	}
415
416	/**
417	* toArray(null) throws NPE
418	*/
419	public void testToArray_null() { testToArray_null(false); }
420	public void testToArray_null_fair() { testToArray_null(true); }
421	public void testToArray_null(boolean fair) {
422	final SynchronousQueue q = new SynchronousQueue(fair);
423	try {
424	Object o[] = q.toArray(null);
425	shouldThrow();
426	} catch (NullPointerException success) {}
427	}
428
429	/**
430	* iterator does not traverse any elements
431	*/
432	public void testIterator() { testIterator(false); }
433	public void testIterator_fair() { testIterator(true); }
434	public void testIterator(boolean fair) {
435	final SynchronousQueue q = new SynchronousQueue(fair);
436	Iterator it = q.iterator();
437	assertFalse(it.hasNext());
438	try {
439	Object x = it.next();
440	shouldThrow();
441	} catch (NoSuchElementException success) {}
442	}
443
444	/**
445	* iterator remove throws ISE
446	*/
447	public void testIteratorRemove() { testIteratorRemove(false); }
448	public void testIteratorRemove_fair() { testIteratorRemove(true); }
449	public void testIteratorRemove(boolean fair) {
450	final SynchronousQueue q = new SynchronousQueue(fair);
451	Iterator it = q.iterator();
452	try {
453	it.remove();
454	shouldThrow();
455	} catch (IllegalStateException success) {}
456	}
457
458	/**
459	* toString returns a non-null string
460	*/
461	public void testToString() { testToString(false); }
462	public void testToString_fair() { testToString(true); }
463	public void testToString(boolean fair) {
464	final SynchronousQueue q = new SynchronousQueue(fair);
465	String s = q.toString();
466	assertNotNull(s);
467	}
468
469	/**
470	* offer transfers elements across Executor tasks
471	*/
472	public void testOfferInExecutor() { testOfferInExecutor(false); }
473	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
474	public void testOfferInExecutor(boolean fair) {
475	final SynchronousQueue q = new SynchronousQueue(fair);
476	ExecutorService executor = Executors.newFixedThreadPool(2);
477	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
478
479	executor.execute(new CheckedRunnable() {
480	public void realRun() throws InterruptedException {
481	assertFalse(q.offer(one));
482	threadsStarted.await();
483	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
484	assertEquals(0, q.remainingCapacity());
485	}});
486
487	executor.execute(new CheckedRunnable() {
488	public void realRun() throws InterruptedException {
489	threadsStarted.await();
490	assertSame(one, q.take());
491	}});
492
493	joinPool(executor);
494	}
495
496	/**
497	* timed poll retrieves elements across Executor threads
498	*/
499	public void testPollInExecutor() { testPollInExecutor(false); }
500	public void testPollInExecutor_fair() { testPollInExecutor(true); }
501	public void testPollInExecutor(boolean fair) {
502	final SynchronousQueue q = new SynchronousQueue(fair);
503	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
504	ExecutorService executor = Executors.newFixedThreadPool(2);
505	executor.execute(new CheckedRunnable() {
506	public void realRun() throws InterruptedException {
507	assertNull(q.poll());
508	threadsStarted.await();
509	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
510	assertTrue(q.isEmpty());
511	}});
512
513	executor.execute(new CheckedRunnable() {
514	public void realRun() throws InterruptedException {
515	threadsStarted.await();
516	q.put(one);
517	}});
518
519	joinPool(executor);
520	}
521
522	/**
523	* a deserialized serialized queue is usable
524	*/
525	public void testSerialization() {
526	final SynchronousQueue x = new SynchronousQueue();
527	final SynchronousQueue y = new SynchronousQueue(false);
528	final SynchronousQueue z = new SynchronousQueue(true);
529	assertSerialEquals(x, y);
530	assertNotSerialEquals(x, z);
531	SynchronousQueue[] qs = { x, y, z };
532	for (SynchronousQueue q : qs) {
533	SynchronousQueue clone = serialClone(q);
534	assertNotSame(q, clone);
535	assertSerialEquals(q, clone);
536	assertTrue(clone.isEmpty());
537	assertEquals(0, clone.size());
538	assertEquals(0, clone.remainingCapacity());
539	assertFalse(clone.offer(zero));
540	}
541	}
542
543	/**
544	* drainTo(c) of empty queue doesn't transfer elements
545	*/
546	public void testDrainTo() { testDrainTo(false); }
547	public void testDrainTo_fair() { testDrainTo(true); }
548	public void testDrainTo(boolean fair) {
549	final SynchronousQueue q = new SynchronousQueue(fair);
550	ArrayList l = new ArrayList();
551	q.drainTo(l);
552	assertEquals(0, q.size());
553	assertEquals(0, l.size());
554	}
555
556	/**
557	* drainTo empties queue, unblocking a waiting put.
558	*/
559	public void testDrainToWithActivePut() { testDrainToWithActivePut(false); }
560	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
561	public void testDrainToWithActivePut(boolean fair) {
562	final SynchronousQueue q = new SynchronousQueue(fair);
563	Thread t = newStartedThread(new CheckedRunnable() {
564	public void realRun() throws InterruptedException {
565	q.put(one);
566	}});
567
568	ArrayList l = new ArrayList();
569	long startTime = System.nanoTime();
570	while (l.isEmpty()) {
571	q.drainTo(l);
572	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
573	fail("timed out");
574	Thread.yield();
575	}
576	assertTrue(l.size() == 1);
577	assertSame(one, l.get(0));
578	awaitTermination(t);
579	}
580
581	/**
582	* drainTo(c, n) empties up to n elements of queue into c
583	*/
584	public void testDrainToN() throws InterruptedException {
585	final SynchronousQueue q = new SynchronousQueue();
586	Thread t1 = newStartedThread(new CheckedRunnable() {
587	public void realRun() throws InterruptedException {
588	q.put(one);
589	}});
590
591	Thread t2 = newStartedThread(new CheckedRunnable() {
592	public void realRun() throws InterruptedException {
593	q.put(two);
594	}});
595
596	ArrayList l = new ArrayList();
597	delay(SHORT_DELAY_MS);
598	q.drainTo(l, 1);
599	assertEquals(1, l.size());
600	q.drainTo(l, 1);
601	assertEquals(2, l.size());
602	assertTrue(l.contains(one));
603	assertTrue(l.contains(two));
604	awaitTermination(t1);
605	awaitTermination(t2);
606	}
607
608	/**
609	* remove(null), contains(null) always return false
610	*/
611	public void testNeverContainsNull() {
612	Collection<?> q = new SynchronousQueue();
613	assertFalse(q.contains(null));
614	assertFalse(q.remove(null));
615	}
616
617	}