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/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.*;
import java.util.concurrent.*;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.io.*;

public class SynchronousQueueTest extends JSR166TestCase {

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

    public static Test suite() {
        return new TestSuite(SynchronousQueueTest.class);
    }

    /**
     * A SynchronousQueue is both empty and full
     */
    public void testEmptyFull() {
        SynchronousQueue q = new SynchronousQueue();
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        assertEquals(0, q.remainingCapacity());
        assertFalse(q.offer(zero));
    }

    /**
     * A fair SynchronousQueue is both empty and full
     */
    public void testFairEmptyFull() {
        SynchronousQueue q = new SynchronousQueue(true);
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        assertEquals(0, q.remainingCapacity());
        assertFalse(q.offer(zero));
    }

    /**
     * offer(null) throws NPE
     */
    public void testOfferNull() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.offer(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * add(null) throws NPE
     */
    public void testAddNull() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.add(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

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

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

    /**
     * addAll(null) throws NPE
     */
    public void testAddAll1() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.addAll(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * addAll(this) throws IAE
     */
    public void testAddAllSelf() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.addAll(q);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * addAll of a collection with null elements throws NPE
     */
    public void testAddAll2() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            Integer[] ints = new Integer[1];
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        } catch (NullPointerException success) {}
    }
    /**
     * addAll throws ISE if no active taker
     */
    public void testAddAll4() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            Integer[] ints = new Integer[1];
            for (int i = 0; i < 1; ++i)
                ints[i] = new Integer(i);
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        } catch (IllegalStateException success) {}
    }

    /**
     * put(null) throws NPE
     */
    public void testPutNull() throws InterruptedException {
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.put(null);
            shouldThrow();
        } catch (NullPointerException success) {}
     }

    /**
     * put blocks interruptibly if no active taker
     */
    public void testBlockingPut() throws InterruptedException {
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                SynchronousQueue q = new SynchronousQueue();
                q.put(zero);
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }

    /**
     * put blocks waiting for take
     */
    public void testPutWithTake() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                int added = 0;
                try {
                    q.put(new Object());
                    ++added;
                    q.put(new Object());
                    ++added;
                    q.put(new Object());
                    ++added;
                    q.put(new Object());
                    ++added;
                    threadShouldThrow();
                } catch (InterruptedException success) {
                    assertTrue(added >= 1);
                }
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        q.take();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }

    /**
     * timed offer times out if elements not taken
     */
    public void testTimedOffer() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
                q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
            }});

        t.start();
        Thread.sleep(SMALL_DELAY_MS);
        t.interrupt();
        t.join();
    }


    /**
     * take blocks interruptibly when empty
     */
    public void testTakeFromEmpty() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                q.take();
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }


    /**
     * put blocks interruptibly if no active taker
     */
    public void testFairBlockingPut() throws InterruptedException {
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                SynchronousQueue q = new SynchronousQueue(true);
                q.put(zero);
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }

    /**
     * put blocks waiting for take
     */
    public void testFairPutWithTake() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue(true);
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                int added = 0;
                try {
                    q.put(new Object());
                    ++added;
                    q.put(new Object());
                    ++added;
                    q.put(new Object());
                    ++added;
                    q.put(new Object());
                    ++added;
                    threadShouldThrow();
                } catch (InterruptedException success) {
                    assertTrue(added >= 1);
                }
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        q.take();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }

    /**
     * timed offer times out if elements not taken
     */
    public void testFairTimedOffer() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue(true);
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
                q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
            }});

        t.start();
        Thread.sleep(SMALL_DELAY_MS);
        t.interrupt();
        t.join();
    }


    /**
     * take blocks interruptibly when empty
     */
    public void testFairTakeFromEmpty() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue(true);
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                q.take();
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }

    /**
     * poll fails unless active taker
     */
    public void testPoll() {
        SynchronousQueue q = new SynchronousQueue();
        assertNull(q.poll());
    }

    /**
     * timed pool with zero timeout times out if no active taker
     */
    public void testTimedPoll0() throws InterruptedException {
        SynchronousQueue q = new SynchronousQueue();
        assertNull(q.poll(0, MILLISECONDS));
    }

    /**
     * timed pool with nonzero timeout times out if no active taker
     */
    public void testTimedPoll() throws InterruptedException {
        SynchronousQueue q = new SynchronousQueue();
        assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
    }

    /**
     * Interrupted timed poll throws InterruptedException instead of
     * returning timeout status
     */
    public void testInterruptedTimedPoll() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                q.poll(SMALL_DELAY_MS, MILLISECONDS);
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }

    /**
     *  timed poll before a delayed offer fails; after offer succeeds;
     *  on interruption throws
     */
    public void testTimedPollWithOffer() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
                assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {}
            }});

        t.start();
        Thread.sleep(SMALL_DELAY_MS);
        assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
        t.interrupt();
        t.join();
    }

    /**
     * Interrupted timed poll throws InterruptedException instead of
     * returning timeout status
     */
    public void testFairInterruptedTimedPoll() throws InterruptedException {
        Thread t = new Thread(new CheckedInterruptedRunnable() {
            public void realRun() throws InterruptedException {
                SynchronousQueue q = new SynchronousQueue(true);
                q.poll(SMALL_DELAY_MS, MILLISECONDS);
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        t.interrupt();
        t.join();
    }

    /**
     *  timed poll before a delayed offer fails; after offer succeeds;
     *  on interruption throws
     */
    public void testFairTimedPollWithOffer() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue(true);
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
                assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    threadShouldThrow();
                } catch (InterruptedException success) {}
            }});

        t.start();
        Thread.sleep(SMALL_DELAY_MS);
        assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
        t.interrupt();
        t.join();
    }


    /**
     * peek returns null
     */
    public void testPeek() {
        SynchronousQueue q = new SynchronousQueue();
        assertNull(q.peek());
    }

    /**
     * element throws NSEE
     */
    public void testElement() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.element();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * remove throws NSEE if no active taker
     */
    public void testRemove() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.remove();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * remove(x) returns false
     */
    public void testRemoveElement() {
        SynchronousQueue q = new SynchronousQueue();
        assertFalse(q.remove(zero));
        assertTrue(q.isEmpty());
    }

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

    /**
     * clear ensures isEmpty
     */
    public void testClear() {
        SynchronousQueue q = new SynchronousQueue();
        q.clear();
        assertTrue(q.isEmpty());
    }

    /**
     * containsAll returns false unless empty
     */
    public void testContainsAll() {
        SynchronousQueue q = new SynchronousQueue();
        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() {
        SynchronousQueue q = new SynchronousQueue();
        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() {
        SynchronousQueue q = new SynchronousQueue();
        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() {
        SynchronousQueue q = new SynchronousQueue();
        Object[] o = q.toArray();
        assertEquals(o.length, 0);
    }

    /**
     * toArray(a) is nulled at position 0
     */
    public void testToArray2() {
        SynchronousQueue q = new SynchronousQueue();
        Integer[] ints = new Integer[1];
        assertNull(ints[0]);
    }

    /**
     * toArray(null) throws NPE
     */
    public void testToArray_BadArg() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            Object o[] = q.toArray(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }


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

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

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


    /**
     * offer transfers elements across Executor tasks
     */
    public void testOfferInExecutor() {
        final SynchronousQueue q = new SynchronousQueue();
        ExecutorService executor = Executors.newFixedThreadPool(2);
        final Integer one = new Integer(1);

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                threadAssertFalse(q.offer(one));
                threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS));
                threadAssertEquals(0, q.remainingCapacity());
            }});

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                Thread.sleep(SMALL_DELAY_MS);
                threadAssertEquals(one, q.take());
            }});

        joinPool(executor);

    }

    /**
     * poll retrieves elements across Executor threads
     */
    public void testPollInExecutor() {
        final SynchronousQueue q = new SynchronousQueue();
        ExecutorService executor = Executors.newFixedThreadPool(2);
        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                threadAssertNull(q.poll());
                threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
                threadAssertTrue(q.isEmpty());
            }});

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                Thread.sleep(SMALL_DELAY_MS);
                q.put(new Integer(1));
            }});

        joinPool(executor);
    }

    /**
     * a deserialized serialized queue is usable
     */
    public void testSerialization() throws Exception {
        SynchronousQueue q = new SynchronousQueue();
        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
        out.writeObject(q);
        out.close();

        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
        SynchronousQueue r = (SynchronousQueue)in.readObject();
        assertEquals(q.size(), r.size());
        while (!q.isEmpty())
            assertEquals(q.remove(), r.remove());
    }

    /**
     * drainTo(null) throws NPE
     */
    public void testDrainToNull() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.drainTo(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * drainTo(this) throws IAE
     */
    public void testDrainToSelf() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.drainTo(q);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

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

    /**
     * drainTo empties queue, unblocking a waiting put.
     */
    public void testDrainToWithActivePut() throws InterruptedException {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                q.put(new Integer(1));
            }});

        t.start();
        ArrayList l = new ArrayList();
        Thread.sleep(SHORT_DELAY_MS);
        q.drainTo(l);
        assertTrue(l.size() <= 1);
        if (l.size() > 0)
            assertEquals(l.get(0), new Integer(1));
        t.join();
        assertTrue(l.size() <= 1);
    }

    /**
     * drainTo(null, n) throws NPE
     */
    public void testDrainToNullN() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.drainTo(null, 0);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * drainTo(this, n) throws IAE
     */
    public void testDrainToSelfN() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.drainTo(q, 0);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

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

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

        t1.start();
        t2.start();
        ArrayList l = new ArrayList();
        Thread.sleep(SHORT_DELAY_MS);
        q.drainTo(l, 1);
        assertTrue(l.size() == 1);
        q.drainTo(l, 1);
        assertTrue(l.size() == 2);
        assertTrue(l.contains(one));
        assertTrue(l.contains(two));
        t1.join();
        t2.join();
    }

}
Revision:	1.16
Committed:	Sat Nov 21 21:00:34 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.15:	+5 -7 lines
Log Message:	reduce scope of check for IE in testWithOffer
#	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/licenses/publicdomain
5	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import junit.framework.*;
10	import java.util.*;
11	import java.util.concurrent.*;
12	import static java.util.concurrent.TimeUnit.MILLISECONDS;
13	import java.io.*;
14
15	public class SynchronousQueueTest extends JSR166TestCase {
16
17	public static void main(String[] args) {
18	junit.textui.TestRunner.run (suite());
19	}
20
21	public static Test suite() {
22	return new TestSuite(SynchronousQueueTest.class);
23	}
24
25	/**
26	* A SynchronousQueue is both empty and full
27	*/
28	public void testEmptyFull() {
29	SynchronousQueue q = new SynchronousQueue();
30	assertTrue(q.isEmpty());
31	assertEquals(0, q.size());
32	assertEquals(0, q.remainingCapacity());
33	assertFalse(q.offer(zero));
34	}
35
36	/**
37	* A fair SynchronousQueue is both empty and full
38	*/
39	public void testFairEmptyFull() {
40	SynchronousQueue q = new SynchronousQueue(true);
41	assertTrue(q.isEmpty());
42	assertEquals(0, q.size());
43	assertEquals(0, q.remainingCapacity());
44	assertFalse(q.offer(zero));
45	}
46
47	/**
48	* offer(null) throws NPE
49	*/
50	public void testOfferNull() {
51	try {
52	SynchronousQueue q = new SynchronousQueue();
53	q.offer(null);
54	shouldThrow();
55	} catch (NullPointerException success) {}
56	}
57
58	/**
59	* add(null) throws NPE
60	*/
61	public void testAddNull() {
62	try {
63	SynchronousQueue q = new SynchronousQueue();
64	q.add(null);
65	shouldThrow();
66	} catch (NullPointerException success) {}
67	}
68
69	/**
70	* offer fails if no active taker
71	*/
72	public void testOffer() {
73	SynchronousQueue q = new SynchronousQueue();
74	assertFalse(q.offer(one));
75	}
76
77	/**
78	* add throws ISE if no active taker
79	*/
80	public void testAdd() {
81	try {
82	SynchronousQueue q = new SynchronousQueue();
83	assertEquals(0, q.remainingCapacity());
84	q.add(one);
85	shouldThrow();
86	} catch (IllegalStateException success) {}
87	}
88
89	/**
90	* addAll(null) throws NPE
91	*/
92	public void testAddAll1() {
93	try {
94	SynchronousQueue q = new SynchronousQueue();
95	q.addAll(null);
96	shouldThrow();
97	} catch (NullPointerException success) {}
98	}
99
100	/**
101	* addAll(this) throws IAE
102	*/
103	public void testAddAllSelf() {
104	try {
105	SynchronousQueue q = new SynchronousQueue();
106	q.addAll(q);
107	shouldThrow();
108	} catch (IllegalArgumentException success) {}
109	}
110
111	/**
112	* addAll of a collection with null elements throws NPE
113	*/
114	public void testAddAll2() {
115	try {
116	SynchronousQueue q = new SynchronousQueue();
117	Integer[] ints = new Integer[1];
118	q.addAll(Arrays.asList(ints));
119	shouldThrow();
120	} catch (NullPointerException success) {}
121	}
122	/**
123	* addAll throws ISE if no active taker
124	*/
125	public void testAddAll4() {
126	try {
127	SynchronousQueue q = new SynchronousQueue();
128	Integer[] ints = new Integer[1];
129	for (int i = 0; i < 1; ++i)
130	ints[i] = new Integer(i);
131	q.addAll(Arrays.asList(ints));
132	shouldThrow();
133	} catch (IllegalStateException success) {}
134	}
135
136	/**
137	* put(null) throws NPE
138	*/
139	public void testPutNull() throws InterruptedException {
140	try {
141	SynchronousQueue q = new SynchronousQueue();
142	q.put(null);
143	shouldThrow();
144	} catch (NullPointerException success) {}
145	}
146
147	/**
148	* put blocks interruptibly if no active taker
149	*/
150	public void testBlockingPut() throws InterruptedException {
151	Thread t = new Thread(new CheckedInterruptedRunnable() {
152	public void realRun() throws InterruptedException {
153	SynchronousQueue q = new SynchronousQueue();
154	q.put(zero);
155	}});
156
157	t.start();
158	Thread.sleep(SHORT_DELAY_MS);
159	t.interrupt();
160	t.join();
161	}
162
163	/**
164	* put blocks waiting for take
165	*/
166	public void testPutWithTake() throws InterruptedException {
167	final SynchronousQueue q = new SynchronousQueue();
168	Thread t = new Thread(new CheckedRunnable() {
169	public void realRun() throws InterruptedException {
170	int added = 0;
171	try {
172	q.put(new Object());
173	++added;
174	q.put(new Object());
175	++added;
176	q.put(new Object());
177	++added;
178	q.put(new Object());
179	++added;
180	threadShouldThrow();
181	} catch (InterruptedException success) {
182	assertTrue(added >= 1);
183	}
184	}});
185
186	t.start();
187	Thread.sleep(SHORT_DELAY_MS);
188	q.take();
189	Thread.sleep(SHORT_DELAY_MS);
190	t.interrupt();
191	t.join();
192	}
193
194	/**
195	* timed offer times out if elements not taken
196	*/
197	public void testTimedOffer() throws InterruptedException {
198	final SynchronousQueue q = new SynchronousQueue();
199	Thread t = new Thread(new CheckedInterruptedRunnable() {
200	public void realRun() throws InterruptedException {
201	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
202	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
203	}});
204
205	t.start();
206	Thread.sleep(SMALL_DELAY_MS);
207	t.interrupt();
208	t.join();
209	}
210
211
212	/**
213	* take blocks interruptibly when empty
214	*/
215	public void testTakeFromEmpty() throws InterruptedException {
216	final SynchronousQueue q = new SynchronousQueue();
217	Thread t = new Thread(new CheckedInterruptedRunnable() {
218	public void realRun() throws InterruptedException {
219	q.take();
220	}});
221
222	t.start();
223	Thread.sleep(SHORT_DELAY_MS);
224	t.interrupt();
225	t.join();
226	}
227
228
229	/**
230	* put blocks interruptibly if no active taker
231	*/
232	public void testFairBlockingPut() throws InterruptedException {
233	Thread t = new Thread(new CheckedInterruptedRunnable() {
234	public void realRun() throws InterruptedException {
235	SynchronousQueue q = new SynchronousQueue(true);
236	q.put(zero);
237	}});
238
239	t.start();
240	Thread.sleep(SHORT_DELAY_MS);
241	t.interrupt();
242	t.join();
243	}
244
245	/**
246	* put blocks waiting for take
247	*/
248	public void testFairPutWithTake() throws InterruptedException {
249	final SynchronousQueue q = new SynchronousQueue(true);
250	Thread t = new Thread(new CheckedRunnable() {
251	public void realRun() throws InterruptedException {
252	int added = 0;
253	try {
254	q.put(new Object());
255	++added;
256	q.put(new Object());
257	++added;
258	q.put(new Object());
259	++added;
260	q.put(new Object());
261	++added;
262	threadShouldThrow();
263	} catch (InterruptedException success) {
264	assertTrue(added >= 1);
265	}
266	}});
267
268	t.start();
269	Thread.sleep(SHORT_DELAY_MS);
270	q.take();
271	Thread.sleep(SHORT_DELAY_MS);
272	t.interrupt();
273	t.join();
274	}
275
276	/**
277	* timed offer times out if elements not taken
278	*/
279	public void testFairTimedOffer() throws InterruptedException {
280	final SynchronousQueue q = new SynchronousQueue(true);
281	Thread t = new Thread(new CheckedInterruptedRunnable() {
282	public void realRun() throws InterruptedException {
283	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
284	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
285	}});
286
287	t.start();
288	Thread.sleep(SMALL_DELAY_MS);
289	t.interrupt();
290	t.join();
291	}
292
293
294	/**
295	* take blocks interruptibly when empty
296	*/
297	public void testFairTakeFromEmpty() throws InterruptedException {
298	final SynchronousQueue q = new SynchronousQueue(true);
299	Thread t = new Thread(new CheckedInterruptedRunnable() {
300	public void realRun() throws InterruptedException {
301	q.take();
302	}});
303
304	t.start();
305	Thread.sleep(SHORT_DELAY_MS);
306	t.interrupt();
307	t.join();
308	}
309
310	/**
311	* poll fails unless active taker
312	*/
313	public void testPoll() {
314	SynchronousQueue q = new SynchronousQueue();
315	assertNull(q.poll());
316	}
317
318	/**
319	* timed pool with zero timeout times out if no active taker
320	*/
321	public void testTimedPoll0() throws InterruptedException {
322	SynchronousQueue q = new SynchronousQueue();
323	assertNull(q.poll(0, MILLISECONDS));
324	}
325
326	/**
327	* timed pool with nonzero timeout times out if no active taker
328	*/
329	public void testTimedPoll() throws InterruptedException {
330	SynchronousQueue q = new SynchronousQueue();
331	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
332	}
333
334	/**
335	* Interrupted timed poll throws InterruptedException instead of
336	* returning timeout status
337	*/
338	public void testInterruptedTimedPoll() throws InterruptedException {
339	final SynchronousQueue q = new SynchronousQueue();
340	Thread t = new Thread(new CheckedInterruptedRunnable() {
341	public void realRun() throws InterruptedException {
342	q.poll(SMALL_DELAY_MS, MILLISECONDS);
343	}});
344
345	t.start();
346	Thread.sleep(SHORT_DELAY_MS);
347	t.interrupt();
348	t.join();
349	}
350
351	/**
352	* timed poll before a delayed offer fails; after offer succeeds;
353	* on interruption throws
354	*/
355	public void testTimedPollWithOffer() throws InterruptedException {
356	final SynchronousQueue q = new SynchronousQueue();
357	Thread t = new Thread(new CheckedRunnable() {
358	public void realRun() throws InterruptedException {
359	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
360	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
361	try {
362	q.poll(LONG_DELAY_MS, MILLISECONDS);
363	shouldThrow();
364	} catch (InterruptedException success) {}
365	}});
366
367	t.start();
368	Thread.sleep(SMALL_DELAY_MS);
369	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
370	t.interrupt();
371	t.join();
372	}
373
374	/**
375	* Interrupted timed poll throws InterruptedException instead of
376	* returning timeout status
377	*/
378	public void testFairInterruptedTimedPoll() throws InterruptedException {
379	Thread t = new Thread(new CheckedInterruptedRunnable() {
380	public void realRun() throws InterruptedException {
381	SynchronousQueue q = new SynchronousQueue(true);
382	q.poll(SMALL_DELAY_MS, MILLISECONDS);
383	}});
384
385	t.start();
386	Thread.sleep(SHORT_DELAY_MS);
387	t.interrupt();
388	t.join();
389	}
390
391	/**
392	* timed poll before a delayed offer fails; after offer succeeds;
393	* on interruption throws
394	*/
395	public void testFairTimedPollWithOffer() throws InterruptedException {
396	final SynchronousQueue q = new SynchronousQueue(true);
397	Thread t = new Thread(new CheckedRunnable() {
398	public void realRun() throws InterruptedException {
399	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
400	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
401	try {
402	q.poll(LONG_DELAY_MS, MILLISECONDS);
403	threadShouldThrow();
404	} catch (InterruptedException success) {}
405	}});
406
407	t.start();
408	Thread.sleep(SMALL_DELAY_MS);
409	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
410	t.interrupt();
411	t.join();
412	}
413
414
415	/**
416	* peek returns null
417	*/
418	public void testPeek() {
419	SynchronousQueue q = new SynchronousQueue();
420	assertNull(q.peek());
421	}
422
423	/**
424	* element throws NSEE
425	*/
426	public void testElement() {
427	SynchronousQueue q = new SynchronousQueue();
428	try {
429	q.element();
430	shouldThrow();
431	} catch (NoSuchElementException success) {}
432	}
433
434	/**
435	* remove throws NSEE if no active taker
436	*/
437	public void testRemove() {
438	SynchronousQueue q = new SynchronousQueue();
439	try {
440	q.remove();
441	shouldThrow();
442	} catch (NoSuchElementException success) {}
443	}
444
445	/**
446	* remove(x) returns false
447	*/
448	public void testRemoveElement() {
449	SynchronousQueue q = new SynchronousQueue();
450	assertFalse(q.remove(zero));
451	assertTrue(q.isEmpty());
452	}
453
454	/**
455	* contains returns false
456	*/
457	public void testContains() {
458	SynchronousQueue q = new SynchronousQueue();
459	assertFalse(q.contains(zero));
460	}
461
462	/**
463	* clear ensures isEmpty
464	*/
465	public void testClear() {
466	SynchronousQueue q = new SynchronousQueue();
467	q.clear();
468	assertTrue(q.isEmpty());
469	}
470
471	/**
472	* containsAll returns false unless empty
473	*/
474	public void testContainsAll() {
475	SynchronousQueue q = new SynchronousQueue();
476	Integer[] empty = new Integer[0];
477	assertTrue(q.containsAll(Arrays.asList(empty)));
478	Integer[] ints = new Integer[1]; ints[0] = zero;
479	assertFalse(q.containsAll(Arrays.asList(ints)));
480	}
481
482	/**
483	* retainAll returns false
484	*/
485	public void testRetainAll() {
486	SynchronousQueue q = new SynchronousQueue();
487	Integer[] empty = new Integer[0];
488	assertFalse(q.retainAll(Arrays.asList(empty)));
489	Integer[] ints = new Integer[1]; ints[0] = zero;
490	assertFalse(q.retainAll(Arrays.asList(ints)));
491	}
492
493	/**
494	* removeAll returns false
495	*/
496	public void testRemoveAll() {
497	SynchronousQueue q = new SynchronousQueue();
498	Integer[] empty = new Integer[0];
499	assertFalse(q.removeAll(Arrays.asList(empty)));
500	Integer[] ints = new Integer[1]; ints[0] = zero;
501	assertFalse(q.containsAll(Arrays.asList(ints)));
502	}
503
504
505	/**
506	* toArray is empty
507	*/
508	public void testToArray() {
509	SynchronousQueue q = new SynchronousQueue();
510	Object[] o = q.toArray();
511	assertEquals(o.length, 0);
512	}
513
514	/**
515	* toArray(a) is nulled at position 0
516	*/
517	public void testToArray2() {
518	SynchronousQueue q = new SynchronousQueue();
519	Integer[] ints = new Integer[1];
520	assertNull(ints[0]);
521	}
522
523	/**
524	* toArray(null) throws NPE
525	*/
526	public void testToArray_BadArg() {
527	try {
528	SynchronousQueue q = new SynchronousQueue();
529	Object o[] = q.toArray(null);
530	shouldThrow();
531	} catch (NullPointerException success) {}
532	}
533
534
535	/**
536	* iterator does not traverse any elements
537	*/
538	public void testIterator() {
539	SynchronousQueue q = new SynchronousQueue();
540	Iterator it = q.iterator();
541	assertFalse(it.hasNext());
542	try {
543	Object x = it.next();
544	shouldThrow();
545	} catch (NoSuchElementException success) {}
546	}
547
548	/**
549	* iterator remove throws ISE
550	*/
551	public void testIteratorRemove() {
552	SynchronousQueue q = new SynchronousQueue();
553	Iterator it = q.iterator();
554	try {
555	it.remove();
556	shouldThrow();
557	} catch (IllegalStateException success) {}
558	}
559
560	/**
561	* toString returns a non-null string
562	*/
563	public void testToString() {
564	SynchronousQueue q = new SynchronousQueue();
565	String s = q.toString();
566	assertNotNull(s);
567	}
568
569
570	/**
571	* offer transfers elements across Executor tasks
572	*/
573	public void testOfferInExecutor() {
574	final SynchronousQueue q = new SynchronousQueue();
575	ExecutorService executor = Executors.newFixedThreadPool(2);
576	final Integer one = new Integer(1);
577
578	executor.execute(new CheckedRunnable() {
579	public void realRun() throws InterruptedException {
580	threadAssertFalse(q.offer(one));
581	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS));
582	threadAssertEquals(0, q.remainingCapacity());
583	}});
584
585	executor.execute(new CheckedRunnable() {
586	public void realRun() throws InterruptedException {
587	Thread.sleep(SMALL_DELAY_MS);
588	threadAssertEquals(one, q.take());
589	}});
590
591	joinPool(executor);
592
593	}
594
595	/**
596	* poll retrieves elements across Executor threads
597	*/
598	public void testPollInExecutor() {
599	final SynchronousQueue q = new SynchronousQueue();
600	ExecutorService executor = Executors.newFixedThreadPool(2);
601	executor.execute(new CheckedRunnable() {
602	public void realRun() throws InterruptedException {
603	threadAssertNull(q.poll());
604	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
605	threadAssertTrue(q.isEmpty());
606	}});
607
608	executor.execute(new CheckedRunnable() {
609	public void realRun() throws InterruptedException {
610	Thread.sleep(SMALL_DELAY_MS);
611	q.put(new Integer(1));
612	}});
613
614	joinPool(executor);
615	}
616
617	/**
618	* a deserialized serialized queue is usable
619	*/
620	public void testSerialization() throws Exception {
621	SynchronousQueue q = new SynchronousQueue();
622	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
623	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
624	out.writeObject(q);
625	out.close();
626
627	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
628	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
629	SynchronousQueue r = (SynchronousQueue)in.readObject();
630	assertEquals(q.size(), r.size());
631	while (!q.isEmpty())
632	assertEquals(q.remove(), r.remove());
633	}
634
635	/**
636	* drainTo(null) throws NPE
637	*/
638	public void testDrainToNull() {
639	SynchronousQueue q = new SynchronousQueue();
640	try {
641	q.drainTo(null);
642	shouldThrow();
643	} catch (NullPointerException success) {}
644	}
645
646	/**
647	* drainTo(this) throws IAE
648	*/
649	public void testDrainToSelf() {
650	SynchronousQueue q = new SynchronousQueue();
651	try {
652	q.drainTo(q);
653	shouldThrow();
654	} catch (IllegalArgumentException success) {}
655	}
656
657	/**
658	* drainTo(c) of empty queue doesn't transfer elements
659	*/
660	public void testDrainTo() {
661	SynchronousQueue q = new SynchronousQueue();
662	ArrayList l = new ArrayList();
663	q.drainTo(l);
664	assertEquals(q.size(), 0);
665	assertEquals(l.size(), 0);
666	}
667
668	/**
669	* drainTo empties queue, unblocking a waiting put.
670	*/
671	public void testDrainToWithActivePut() throws InterruptedException {
672	final SynchronousQueue q = new SynchronousQueue();
673	Thread t = new Thread(new CheckedRunnable() {
674	public void realRun() throws InterruptedException {
675	q.put(new Integer(1));
676	}});
677
678	t.start();
679	ArrayList l = new ArrayList();
680	Thread.sleep(SHORT_DELAY_MS);
681	q.drainTo(l);
682	assertTrue(l.size() <= 1);
683	if (l.size() > 0)
684	assertEquals(l.get(0), new Integer(1));
685	t.join();
686	assertTrue(l.size() <= 1);
687	}
688
689	/**
690	* drainTo(null, n) throws NPE
691	*/
692	public void testDrainToNullN() {
693	SynchronousQueue q = new SynchronousQueue();
694	try {
695	q.drainTo(null, 0);
696	shouldThrow();
697	} catch (NullPointerException success) {}
698	}
699
700	/**
701	* drainTo(this, n) throws IAE
702	*/
703	public void testDrainToSelfN() {
704	SynchronousQueue q = new SynchronousQueue();
705	try {
706	q.drainTo(q, 0);
707	shouldThrow();
708	} catch (IllegalArgumentException success) {}
709	}
710
711	/**
712	* drainTo(c, n) empties up to n elements of queue into c
713	*/
714	public void testDrainToN() throws InterruptedException {
715	final SynchronousQueue q = new SynchronousQueue();
716	Thread t1 = new Thread(new CheckedRunnable() {
717	public void realRun() throws InterruptedException {
718	q.put(one);
719	}});
720
721	Thread t2 = new Thread(new CheckedRunnable() {
722	public void realRun() throws InterruptedException {
723	q.put(two);
724	}});
725
726	t1.start();
727	t2.start();
728	ArrayList l = new ArrayList();
729	Thread.sleep(SHORT_DELAY_MS);
730	q.drainTo(l, 1);
731	assertTrue(l.size() == 1);
732	q.drainTo(l, 1);
733	assertTrue(l.size() == 2);
734	assertTrue(l.contains(one));
735	assertTrue(l.contains(two));
736	t1.join();
737	t2.join();
738	}
739
740	}