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 {
                    while (true) {
                        q.put(added);
                        ++added;
                    }
                } catch (InterruptedException success) {
                    assertTrue(added == 1);
                }
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        assertEquals(0, 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 {
                assertFalse(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 {
                    while (true) {
                        q.put(added);
                        ++added;
                    }
                } catch (InterruptedException success) {
                    assertTrue(added == 1);
                }
            }});

        t.start();
        Thread.sleep(SHORT_DELAY_MS);
        assertEquals(0, 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 {
                assertFalse(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() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            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);

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

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                Thread.sleep(SMALL_DELAY_MS);
                assertSame(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 {
                assertNull(q.poll());
                assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
                assertTrue(q.isEmpty());
            }});

        executor.execute(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                Thread.sleep(SHORT_DELAY_MS);
                q.put(one);
            }});

        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:	1.22
Committed:	Wed Aug 25 01:44:48 2010 UTC (13 years, 8 months ago) by jsr166
Branch:	MAIN
Changes since 1.21:	+1 -0 lines
Log Message:	whitespace
#	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	/**
124	* addAll throws ISE if no active taker
125	*/
126	public void testAddAll4() {
127	try {
128	SynchronousQueue q = new SynchronousQueue();
129	Integer[] ints = new Integer[1];
130	for (int i = 0; i < 1; ++i)
131	ints[i] = new Integer(i);
132	q.addAll(Arrays.asList(ints));
133	shouldThrow();
134	} catch (IllegalStateException success) {}
135	}
136
137	/**
138	* put(null) throws NPE
139	*/
140	public void testPutNull() throws InterruptedException {
141	try {
142	SynchronousQueue q = new SynchronousQueue();
143	q.put(null);
144	shouldThrow();
145	} catch (NullPointerException success) {}
146	}
147
148	/**
149	* put blocks interruptibly if no active taker
150	*/
151	public void testBlockingPut() throws InterruptedException {
152	Thread t = new Thread(new CheckedInterruptedRunnable() {
153	public void realRun() throws InterruptedException {
154	SynchronousQueue q = new SynchronousQueue();
155	q.put(zero);
156	}});
157
158	t.start();
159	Thread.sleep(SHORT_DELAY_MS);
160	t.interrupt();
161	t.join();
162	}
163
164	/**
165	* put blocks waiting for take
166	*/
167	public void testPutWithTake() throws InterruptedException {
168	final SynchronousQueue q = new SynchronousQueue();
169	Thread t = new Thread(new CheckedRunnable() {
170	public void realRun() throws InterruptedException {
171	int added = 0;
172	try {
173	while (true) {
174	q.put(added);
175	++added;
176	}
177	} catch (InterruptedException success) {
178	assertTrue(added == 1);
179	}
180	}});
181
182	t.start();
183	Thread.sleep(SHORT_DELAY_MS);
184	assertEquals(0, q.take());
185	Thread.sleep(SHORT_DELAY_MS);
186	t.interrupt();
187	t.join();
188	}
189
190	/**
191	* timed offer times out if elements not taken
192	*/
193	public void testTimedOffer() throws InterruptedException {
194	final SynchronousQueue q = new SynchronousQueue();
195	Thread t = new Thread(new CheckedInterruptedRunnable() {
196	public void realRun() throws InterruptedException {
197	assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
198	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
199	}});
200
201	t.start();
202	Thread.sleep(SMALL_DELAY_MS);
203	t.interrupt();
204	t.join();
205	}
206
207
208	/**
209	* take blocks interruptibly when empty
210	*/
211	public void testTakeFromEmpty() throws InterruptedException {
212	final SynchronousQueue q = new SynchronousQueue();
213	Thread t = new Thread(new CheckedInterruptedRunnable() {
214	public void realRun() throws InterruptedException {
215	q.take();
216	}});
217
218	t.start();
219	Thread.sleep(SHORT_DELAY_MS);
220	t.interrupt();
221	t.join();
222	}
223
224
225	/**
226	* put blocks interruptibly if no active taker
227	*/
228	public void testFairBlockingPut() throws InterruptedException {
229	Thread t = new Thread(new CheckedInterruptedRunnable() {
230	public void realRun() throws InterruptedException {
231	SynchronousQueue q = new SynchronousQueue(true);
232	q.put(zero);
233	}});
234
235	t.start();
236	Thread.sleep(SHORT_DELAY_MS);
237	t.interrupt();
238	t.join();
239	}
240
241	/**
242	* put blocks waiting for take
243	*/
244	public void testFairPutWithTake() throws InterruptedException {
245	final SynchronousQueue q = new SynchronousQueue(true);
246	Thread t = new Thread(new CheckedRunnable() {
247	public void realRun() throws InterruptedException {
248	int added = 0;
249	try {
250	while (true) {
251	q.put(added);
252	++added;
253	}
254	} catch (InterruptedException success) {
255	assertTrue(added == 1);
256	}
257	}});
258
259	t.start();
260	Thread.sleep(SHORT_DELAY_MS);
261	assertEquals(0, q.take());
262	Thread.sleep(SHORT_DELAY_MS);
263	t.interrupt();
264	t.join();
265	}
266
267	/**
268	* timed offer times out if elements not taken
269	*/
270	public void testFairTimedOffer() throws InterruptedException {
271	final SynchronousQueue q = new SynchronousQueue(true);
272	Thread t = new Thread(new CheckedInterruptedRunnable() {
273	public void realRun() throws InterruptedException {
274	assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
275	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
276	}});
277
278	t.start();
279	Thread.sleep(SMALL_DELAY_MS);
280	t.interrupt();
281	t.join();
282	}
283
284
285	/**
286	* take blocks interruptibly when empty
287	*/
288	public void testFairTakeFromEmpty() throws InterruptedException {
289	final SynchronousQueue q = new SynchronousQueue(true);
290	Thread t = new Thread(new CheckedInterruptedRunnable() {
291	public void realRun() throws InterruptedException {
292	q.take();
293	}});
294
295	t.start();
296	Thread.sleep(SHORT_DELAY_MS);
297	t.interrupt();
298	t.join();
299	}
300
301	/**
302	* poll fails unless active taker
303	*/
304	public void testPoll() {
305	SynchronousQueue q = new SynchronousQueue();
306	assertNull(q.poll());
307	}
308
309	/**
310	* timed pool with zero timeout times out if no active taker
311	*/
312	public void testTimedPoll0() throws InterruptedException {
313	SynchronousQueue q = new SynchronousQueue();
314	assertNull(q.poll(0, MILLISECONDS));
315	}
316
317	/**
318	* timed pool with nonzero timeout times out if no active taker
319	*/
320	public void testTimedPoll() throws InterruptedException {
321	SynchronousQueue q = new SynchronousQueue();
322	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
323	}
324
325	/**
326	* Interrupted timed poll throws InterruptedException instead of
327	* returning timeout status
328	*/
329	public void testInterruptedTimedPoll() throws InterruptedException {
330	final SynchronousQueue q = new SynchronousQueue();
331	Thread t = new Thread(new CheckedInterruptedRunnable() {
332	public void realRun() throws InterruptedException {
333	q.poll(SMALL_DELAY_MS, MILLISECONDS);
334	}});
335
336	t.start();
337	Thread.sleep(SHORT_DELAY_MS);
338	t.interrupt();
339	t.join();
340	}
341
342	/**
343	* timed poll before a delayed offer fails; after offer succeeds;
344	* on interruption throws
345	*/
346	public void testTimedPollWithOffer() throws InterruptedException {
347	final SynchronousQueue q = new SynchronousQueue();
348	Thread t = new Thread(new CheckedRunnable() {
349	public void realRun() throws InterruptedException {
350	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
351	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
352	try {
353	q.poll(LONG_DELAY_MS, MILLISECONDS);
354	shouldThrow();
355	} catch (InterruptedException success) {}
356	}});
357
358	t.start();
359	Thread.sleep(SMALL_DELAY_MS);
360	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
361	t.interrupt();
362	t.join();
363	}
364
365	/**
366	* Interrupted timed poll throws InterruptedException instead of
367	* returning timeout status
368	*/
369	public void testFairInterruptedTimedPoll() throws InterruptedException {
370	Thread t = new Thread(new CheckedInterruptedRunnable() {
371	public void realRun() throws InterruptedException {
372	SynchronousQueue q = new SynchronousQueue(true);
373	q.poll(SMALL_DELAY_MS, MILLISECONDS);
374	}});
375
376	t.start();
377	Thread.sleep(SHORT_DELAY_MS);
378	t.interrupt();
379	t.join();
380	}
381
382	/**
383	* timed poll before a delayed offer fails; after offer succeeds;
384	* on interruption throws
385	*/
386	public void testFairTimedPollWithOffer() throws InterruptedException {
387	final SynchronousQueue q = new SynchronousQueue(true);
388	Thread t = new Thread(new CheckedRunnable() {
389	public void realRun() throws InterruptedException {
390	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
391	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
392	try {
393	q.poll(LONG_DELAY_MS, MILLISECONDS);
394	threadShouldThrow();
395	} catch (InterruptedException success) {}
396	}});
397
398	t.start();
399	Thread.sleep(SMALL_DELAY_MS);
400	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
401	t.interrupt();
402	t.join();
403	}
404
405
406	/**
407	* peek returns null
408	*/
409	public void testPeek() {
410	SynchronousQueue q = new SynchronousQueue();
411	assertNull(q.peek());
412	}
413
414	/**
415	* element throws NSEE
416	*/
417	public void testElement() {
418	SynchronousQueue q = new SynchronousQueue();
419	try {
420	q.element();
421	shouldThrow();
422	} catch (NoSuchElementException success) {}
423	}
424
425	/**
426	* remove throws NSEE if no active taker
427	*/
428	public void testRemove() {
429	SynchronousQueue q = new SynchronousQueue();
430	try {
431	q.remove();
432	shouldThrow();
433	} catch (NoSuchElementException success) {}
434	}
435
436	/**
437	* remove(x) returns false
438	*/
439	public void testRemoveElement() {
440	SynchronousQueue q = new SynchronousQueue();
441	assertFalse(q.remove(zero));
442	assertTrue(q.isEmpty());
443	}
444
445	/**
446	* contains returns false
447	*/
448	public void testContains() {
449	SynchronousQueue q = new SynchronousQueue();
450	assertFalse(q.contains(zero));
451	}
452
453	/**
454	* clear ensures isEmpty
455	*/
456	public void testClear() {
457	SynchronousQueue q = new SynchronousQueue();
458	q.clear();
459	assertTrue(q.isEmpty());
460	}
461
462	/**
463	* containsAll returns false unless empty
464	*/
465	public void testContainsAll() {
466	SynchronousQueue q = new SynchronousQueue();
467	Integer[] empty = new Integer[0];
468	assertTrue(q.containsAll(Arrays.asList(empty)));
469	Integer[] ints = new Integer[1]; ints[0] = zero;
470	assertFalse(q.containsAll(Arrays.asList(ints)));
471	}
472
473	/**
474	* retainAll returns false
475	*/
476	public void testRetainAll() {
477	SynchronousQueue q = new SynchronousQueue();
478	Integer[] empty = new Integer[0];
479	assertFalse(q.retainAll(Arrays.asList(empty)));
480	Integer[] ints = new Integer[1]; ints[0] = zero;
481	assertFalse(q.retainAll(Arrays.asList(ints)));
482	}
483
484	/**
485	* removeAll returns false
486	*/
487	public void testRemoveAll() {
488	SynchronousQueue q = new SynchronousQueue();
489	Integer[] empty = new Integer[0];
490	assertFalse(q.removeAll(Arrays.asList(empty)));
491	Integer[] ints = new Integer[1]; ints[0] = zero;
492	assertFalse(q.containsAll(Arrays.asList(ints)));
493	}
494
495
496	/**
497	* toArray is empty
498	*/
499	public void testToArray() {
500	SynchronousQueue q = new SynchronousQueue();
501	Object[] o = q.toArray();
502	assertEquals(o.length, 0);
503	}
504
505	/**
506	* toArray(a) is nulled at position 0
507	*/
508	public void testToArray2() {
509	SynchronousQueue q = new SynchronousQueue();
510	Integer[] ints = new Integer[1];
511	assertNull(ints[0]);
512	}
513
514	/**
515	* toArray(null) throws NPE
516	*/
517	public void testToArray_BadArg() {
518	SynchronousQueue q = new SynchronousQueue();
519	try {
520	Object o[] = q.toArray(null);
521	shouldThrow();
522	} catch (NullPointerException success) {}
523	}
524
525
526	/**
527	* iterator does not traverse any elements
528	*/
529	public void testIterator() {
530	SynchronousQueue q = new SynchronousQueue();
531	Iterator it = q.iterator();
532	assertFalse(it.hasNext());
533	try {
534	Object x = it.next();
535	shouldThrow();
536	} catch (NoSuchElementException success) {}
537	}
538
539	/**
540	* iterator remove throws ISE
541	*/
542	public void testIteratorRemove() {
543	SynchronousQueue q = new SynchronousQueue();
544	Iterator it = q.iterator();
545	try {
546	it.remove();
547	shouldThrow();
548	} catch (IllegalStateException success) {}
549	}
550
551	/**
552	* toString returns a non-null string
553	*/
554	public void testToString() {
555	SynchronousQueue q = new SynchronousQueue();
556	String s = q.toString();
557	assertNotNull(s);
558	}
559
560
561	/**
562	* offer transfers elements across Executor tasks
563	*/
564	public void testOfferInExecutor() {
565	final SynchronousQueue q = new SynchronousQueue();
566	ExecutorService executor = Executors.newFixedThreadPool(2);
567
568	executor.execute(new CheckedRunnable() {
569	public void realRun() throws InterruptedException {
570	assertFalse(q.offer(one));
571	assertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS));
572	assertEquals(0, q.remainingCapacity());
573	}});
574
575	executor.execute(new CheckedRunnable() {
576	public void realRun() throws InterruptedException {
577	Thread.sleep(SMALL_DELAY_MS);
578	assertSame(one, q.take());
579	}});
580
581	joinPool(executor);
582	}
583
584	/**
585	* poll retrieves elements across Executor threads
586	*/
587	public void testPollInExecutor() {
588	final SynchronousQueue q = new SynchronousQueue();
589	ExecutorService executor = Executors.newFixedThreadPool(2);
590	executor.execute(new CheckedRunnable() {
591	public void realRun() throws InterruptedException {
592	assertNull(q.poll());
593	assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
594	assertTrue(q.isEmpty());
595	}});
596
597	executor.execute(new CheckedRunnable() {
598	public void realRun() throws InterruptedException {
599	Thread.sleep(SHORT_DELAY_MS);
600	q.put(one);
601	}});
602
603	joinPool(executor);
604	}
605
606	/**
607	* a deserialized serialized queue is usable
608	*/
609	public void testSerialization() throws Exception {
610	SynchronousQueue q = new SynchronousQueue();
611	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
612	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
613	out.writeObject(q);
614	out.close();
615
616	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
617	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
618	SynchronousQueue r = (SynchronousQueue)in.readObject();
619	assertEquals(q.size(), r.size());
620	while (!q.isEmpty())
621	assertEquals(q.remove(), r.remove());
622	}
623
624	/**
625	* drainTo(null) throws NPE
626	*/
627	public void testDrainToNull() {
628	SynchronousQueue q = new SynchronousQueue();
629	try {
630	q.drainTo(null);
631	shouldThrow();
632	} catch (NullPointerException success) {}
633	}
634
635	/**
636	* drainTo(this) throws IAE
637	*/
638	public void testDrainToSelf() {
639	SynchronousQueue q = new SynchronousQueue();
640	try {
641	q.drainTo(q);
642	shouldThrow();
643	} catch (IllegalArgumentException success) {}
644	}
645
646	/**
647	* drainTo(c) of empty queue doesn't transfer elements
648	*/
649	public void testDrainTo() {
650	SynchronousQueue q = new SynchronousQueue();
651	ArrayList l = new ArrayList();
652	q.drainTo(l);
653	assertEquals(q.size(), 0);
654	assertEquals(l.size(), 0);
655	}
656
657	/**
658	* drainTo empties queue, unblocking a waiting put.
659	*/
660	public void testDrainToWithActivePut() throws InterruptedException {
661	final SynchronousQueue q = new SynchronousQueue();
662	Thread t = new Thread(new CheckedRunnable() {
663	public void realRun() throws InterruptedException {
664	q.put(new Integer(1));
665	}});
666
667	t.start();
668	ArrayList l = new ArrayList();
669	Thread.sleep(SHORT_DELAY_MS);
670	q.drainTo(l);
671	assertTrue(l.size() <= 1);
672	if (l.size() > 0)
673	assertEquals(l.get(0), new Integer(1));
674	t.join();
675	assertTrue(l.size() <= 1);
676	}
677
678	/**
679	* drainTo(null, n) throws NPE
680	*/
681	public void testDrainToNullN() {
682	SynchronousQueue q = new SynchronousQueue();
683	try {
684	q.drainTo(null, 0);
685	shouldThrow();
686	} catch (NullPointerException success) {}
687	}
688
689	/**
690	* drainTo(this, n) throws IAE
691	*/
692	public void testDrainToSelfN() {
693	SynchronousQueue q = new SynchronousQueue();
694	try {
695	q.drainTo(q, 0);
696	shouldThrow();
697	} catch (IllegalArgumentException success) {}
698	}
699
700	/**
701	* drainTo(c, n) empties up to n elements of queue into c
702	*/
703	public void testDrainToN() throws InterruptedException {
704	final SynchronousQueue q = new SynchronousQueue();
705	Thread t1 = new Thread(new CheckedRunnable() {
706	public void realRun() throws InterruptedException {
707	q.put(one);
708	}});
709
710	Thread t2 = new Thread(new CheckedRunnable() {
711	public void realRun() throws InterruptedException {
712	q.put(two);
713	}});
714
715	t1.start();
716	t2.start();
717	ArrayList l = new ArrayList();
718	Thread.sleep(SHORT_DELAY_MS);
719	q.drainTo(l, 1);
720	assertTrue(l.size() == 1);
721	q.drainTo(l, 1);
722	assertTrue(l.size() == 2);
723	assertTrue(l.contains(one));
724	assertTrue(l.contains(two));
725	t1.join();
726	t2.join();
727	}
728
729	}