test/tck/PriorityBlockingQueueTest.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.Comparator;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.concurrent.PriorityBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

public class PriorityBlockingQueueTest extends JSR166TestCase {

    public static class Generic extends BlockingQueueTest {
        protected BlockingQueue emptyCollection() {
            return new PriorityBlockingQueue();
        }
    }

    public static class InitialCapacity extends BlockingQueueTest {
        protected BlockingQueue emptyCollection() {
            return new PriorityBlockingQueue(SIZE);
        }
    }

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

    public static Test suite() {
        return newTestSuite(PriorityBlockingQueueTest.class,
                            new Generic().testSuite(),
                            new InitialCapacity().testSuite());
    }

    private static final int NOCAP = Integer.MAX_VALUE;

    /** Sample Comparator */
    static class MyReverseComparator implements Comparator {
        public int compare(Object x, Object y) {
            return ((Comparable)y).compareTo(x);
        }
    }

    /**
     * Returns a new queue of given size containing consecutive
     * Integers 0 ... n.
     */
    private PriorityBlockingQueue<Integer> populatedQueue(int n) {
        PriorityBlockingQueue<Integer> q =
            new PriorityBlockingQueue<Integer>(n);
        assertTrue(q.isEmpty());
        for (int i = n-1; i >= 0; i-=2)
            assertTrue(q.offer(new Integer(i)));
        for (int i = (n & 1); i < n; i+=2)
            assertTrue(q.offer(new Integer(i)));
        assertFalse(q.isEmpty());
        assertEquals(NOCAP, q.remainingCapacity());
        assertEquals(n, q.size());
        return q;
    }

    /**
     * A new queue has unbounded capacity
     */
    public void testConstructor1() {
        assertEquals(NOCAP, new PriorityBlockingQueue(SIZE).remainingCapacity());
    }

    /**
     * Constructor throws IAE if capacity argument nonpositive
     */
    public void testConstructor2() {
        try {
            new PriorityBlockingQueue(0);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * Initializing from null Collection throws NPE
     */
    public void testConstructor3() {
        try {
            new PriorityBlockingQueue(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Initializing from Collection of null elements throws NPE
     */
    public void testConstructor4() {
        Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
        try {
            new PriorityBlockingQueue(elements);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Initializing from Collection with some null elements throws NPE
     */
    public void testConstructor5() {
        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE-1; ++i)
            ints[i] = i;
        Collection<Integer> elements = Arrays.asList(ints);
        try {
            new PriorityBlockingQueue(elements);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Queue contains all elements of collection used to initialize
     */
    public void testConstructor6() {
        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE; ++i)
            ints[i] = i;
        PriorityBlockingQueue q = new PriorityBlockingQueue(Arrays.asList(ints));
        for (int i = 0; i < SIZE; ++i)
            assertEquals(ints[i], q.poll());
    }

    /**
     * The comparator used in constructor is used
     */
    public void testConstructor7() {
        MyReverseComparator cmp = new MyReverseComparator();
        PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE, cmp);
        assertEquals(cmp, q.comparator());
        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE; ++i)
            ints[i] = new Integer(i);
        q.addAll(Arrays.asList(ints));
        for (int i = SIZE-1; i >= 0; --i)
            assertEquals(ints[i], q.poll());
    }

    /**
     * isEmpty is true before add, false after
     */
    public void testEmpty() {
        PriorityBlockingQueue q = new PriorityBlockingQueue(2);
        assertTrue(q.isEmpty());
        assertEquals(NOCAP, q.remainingCapacity());
        q.add(one);
        assertFalse(q.isEmpty());
        q.add(two);
        q.remove();
        q.remove();
        assertTrue(q.isEmpty());
    }

    /**
     * remainingCapacity does not change when elements added or removed,
     * but size does
     */
    public void testRemainingCapacity() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(NOCAP, q.remainingCapacity());
            assertEquals(SIZE-i, q.size());
            q.remove();
        }
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(NOCAP, q.remainingCapacity());
            assertEquals(i, q.size());
            q.add(new Integer(i));
        }
    }

    /**
     * Offer of comparable element succeeds
     */
    public void testOffer() {
        PriorityBlockingQueue q = new PriorityBlockingQueue(1);
        assertTrue(q.offer(zero));
        assertTrue(q.offer(one));
    }

    /**
     * Offer of non-Comparable throws CCE
     */
    public void testOfferNonComparable() {
        try {
            PriorityBlockingQueue q = new PriorityBlockingQueue(1);
            q.offer(new Object());
            q.offer(new Object());
            q.offer(new Object());
            shouldThrow();
        } catch (ClassCastException success) {}
    }

    /**
     * add of comparable succeeds
     */
    public void testAdd() {
        PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.size());
            assertTrue(q.add(new Integer(i)));
        }
    }

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

    /**
     * addAll of a collection with any null elements throws NPE after
     * possibly adding some elements
     */
    public void testAddAll3() {
        try {
            PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE-1; ++i)
                ints[i] = new Integer(i);
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Queue contains all elements of successful addAll
     */
    public void testAddAll5() {
        Integer[] empty = new Integer[0];
        Integer[] ints = new Integer[SIZE];
        for (int i = SIZE-1; i >= 0; --i)
            ints[i] = new Integer(i);
        PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
        assertFalse(q.addAll(Arrays.asList(empty)));
        assertTrue(q.addAll(Arrays.asList(ints)));
        for (int i = 0; i < SIZE; ++i)
            assertEquals(ints[i], q.poll());
    }

    /**
     * all elements successfully put are contained
     */
    public void testPut() {
        PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            Integer I = new Integer(i);
            q.put(I);
            assertTrue(q.contains(I));
        }
        assertEquals(SIZE, q.size());
    }

    /**
     * put doesn't block waiting for take
     */
    public void testPutWithTake() throws InterruptedException {
        final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
        final int size = 4;
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                for (int i = 0; i < size; i++)
                    q.put(new Integer(0));
            }});

        awaitTermination(t);
        assertEquals(size, q.size());
        q.take();
    }

    /**
     * timed offer does not time out
     */
    public void testTimedOffer() throws InterruptedException {
        final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                q.put(new Integer(0));
                q.put(new Integer(0));
                assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, MILLISECONDS));
                assertTrue(q.offer(new Integer(0), LONG_DELAY_MS, MILLISECONDS));
            }});

        awaitTermination(t);
    }

    /**
     * take retrieves elements in priority order
     */
    public void testTake() throws InterruptedException {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.take());
        }
    }

    /**
     * Take removes existing elements until empty, then blocks interruptibly
     */
    public void testBlockingTake() throws InterruptedException {
        final PriorityBlockingQueue q = populatedQueue(SIZE);
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                for (int i = 0; i < SIZE; ++i) {
                    assertEquals(i, q.take());
                }

                Thread.currentThread().interrupt();
                try {
                    q.take();
                    shouldThrow();
                } catch (InterruptedException success) {}
                assertFalse(Thread.interrupted());

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

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

    /**
     * poll succeeds unless empty
     */
    public void testPoll() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.poll());
        }
        assertNull(q.poll());
    }

    /**
     * timed poll with zero timeout succeeds when non-empty, else times out
     */
    public void testTimedPoll0() throws InterruptedException {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.poll(0, MILLISECONDS));
        }
        assertNull(q.poll(0, MILLISECONDS));
    }

    /**
     * timed poll with nonzero timeout succeeds when non-empty, else times out
     */
    public void testTimedPoll() throws InterruptedException {
        PriorityBlockingQueue<Integer> q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            long startTime = System.nanoTime();
            assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
            assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
        }
        long startTime = System.nanoTime();
        assertNull(q.poll(timeoutMillis(), MILLISECONDS));
        assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
        checkEmpty(q);
    }

    /**
     * Interrupted timed poll throws InterruptedException instead of
     * returning timeout status
     */
    public void testInterruptedTimedPoll() throws InterruptedException {
        final BlockingQueue<Integer> q = populatedQueue(SIZE);
        final CountDownLatch aboutToWait = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                for (int i = 0; i < SIZE; ++i) {
                    long t0 = System.nanoTime();
                    assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
                    assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
                }
                long t0 = System.nanoTime();
                aboutToWait.countDown();
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {
                    assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
                }
            }});

        aboutToWait.await();
        waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
        t.interrupt();
        awaitTermination(t, MEDIUM_DELAY_MS);
    }

    /**
     * peek returns next element, or null if empty
     */
    public void testPeek() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.peek());
            assertEquals(i, q.poll());
            assertTrue(q.peek() == null ||
                       !q.peek().equals(i));
        }
        assertNull(q.peek());
    }

    /**
     * element returns next element, or throws NSEE if empty
     */
    public void testElement() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.element());
            assertEquals(i, q.poll());
        }
        try {
            q.element();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * remove removes next element, or throws NSEE if empty
     */
    public void testRemove() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.remove());
        }
        try {
            q.remove();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * contains(x) reports true when elements added but not yet removed
     */
    public void testContains() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(q.contains(new Integer(i)));
            q.poll();
            assertFalse(q.contains(new Integer(i)));
        }
    }

    /**
     * clear removes all elements
     */
    public void testClear() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        q.clear();
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        q.add(one);
        assertFalse(q.isEmpty());
        assertTrue(q.contains(one));
        q.clear();
        assertTrue(q.isEmpty());
    }

    /**
     * containsAll(c) is true when c contains a subset of elements
     */
    public void testContainsAll() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        PriorityBlockingQueue p = new PriorityBlockingQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(q.containsAll(p));
            assertFalse(p.containsAll(q));
            p.add(new Integer(i));
        }
        assertTrue(p.containsAll(q));
    }

    /**
     * retainAll(c) retains only those elements of c and reports true if changed
     */
    public void testRetainAll() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        PriorityBlockingQueue p = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            boolean changed = q.retainAll(p);
            if (i == 0)
                assertFalse(changed);
            else
                assertTrue(changed);

            assertTrue(q.containsAll(p));
            assertEquals(SIZE-i, q.size());
            p.remove();
        }
    }

    /**
     * removeAll(c) removes only those elements of c and reports true if changed
     */
    public void testRemoveAll() {
        for (int i = 1; i < SIZE; ++i) {
            PriorityBlockingQueue q = populatedQueue(SIZE);
            PriorityBlockingQueue p = populatedQueue(i);
            assertTrue(q.removeAll(p));
            assertEquals(SIZE-i, q.size());
            for (int j = 0; j < i; ++j) {
                Integer I = (Integer)(p.remove());
                assertFalse(q.contains(I));
            }
        }
    }

    /**
     * toArray contains all elements
     */
    public void testToArray() throws InterruptedException {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        Object[] o = q.toArray();
        Arrays.sort(o);
        for (int i = 0; i < o.length; i++)
            assertSame(o[i], q.take());
    }

    /**
     * toArray(a) contains all elements
     */
    public void testToArray2() throws InterruptedException {
        PriorityBlockingQueue<Integer> q = populatedQueue(SIZE);
        Integer[] ints = new Integer[SIZE];
        Integer[] array = q.toArray(ints);
        assertSame(ints, array);
        Arrays.sort(ints);
        for (int i = 0; i < ints.length; i++)
            assertSame(ints[i], q.take());
    }

    /**
     * toArray(incompatible array type) throws ArrayStoreException
     */
    public void testToArray1_BadArg() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        try {
            q.toArray(new String[10]);
            shouldThrow();
        } catch (ArrayStoreException success) {}
    }

    /**
     * iterator iterates through all elements
     */
    public void testIterator() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        int i = 0;
        Iterator it = q.iterator();
        while (it.hasNext()) {
            assertTrue(q.contains(it.next()));
            ++i;
        }
        assertEquals(i, SIZE);
    }

    /**
     * iterator.remove removes current element
     */
    public void testIteratorRemove() {
        final PriorityBlockingQueue q = new PriorityBlockingQueue(3);
        q.add(new Integer(2));
        q.add(new Integer(1));
        q.add(new Integer(3));

        Iterator it = q.iterator();
        it.next();
        it.remove();

        it = q.iterator();
        assertEquals(it.next(), new Integer(2));
        assertEquals(it.next(), new Integer(3));
        assertFalse(it.hasNext());
    }

    /**
     * toString contains toStrings of elements
     */
    public void testToString() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        String s = q.toString();
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(s.contains(String.valueOf(i)));
        }
    }

    /**
     * timed poll transfers elements across Executor tasks
     */
    public void testPollInExecutor() {
        final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
        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));
                checkEmpty(q);
            }});

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

        joinPool(executor);
    }

    /**
     * A deserialized serialized queue has same elements
     */
    public void testSerialization() throws Exception {
        Queue x = populatedQueue(SIZE);
        Queue y = serialClone(x);

        assertNotSame(x, y);
        assertEquals(x.size(), y.size());
        while (!x.isEmpty()) {
            assertFalse(y.isEmpty());
            assertEquals(x.remove(), y.remove());
        }
        assertTrue(y.isEmpty());
    }

    /**
     * drainTo(c) empties queue into another collection c
     */
    public void testDrainTo() {
        PriorityBlockingQueue q = populatedQueue(SIZE);
        ArrayList l = new ArrayList();
        q.drainTo(l);
        assertEquals(0, q.size());
        assertEquals(SIZE, l.size());
        for (int i = 0; i < SIZE; ++i)
            assertEquals(l.get(i), new Integer(i));
        q.add(zero);
        q.add(one);
        assertFalse(q.isEmpty());
        assertTrue(q.contains(zero));
        assertTrue(q.contains(one));
        l.clear();
        q.drainTo(l);
        assertEquals(0, q.size());
        assertEquals(2, l.size());
        for (int i = 0; i < 2; ++i)
            assertEquals(l.get(i), new Integer(i));
    }

    /**
     * drainTo empties queue
     */
    public void testDrainToWithActivePut() throws InterruptedException {
        final PriorityBlockingQueue q = populatedQueue(SIZE);
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                q.put(new Integer(SIZE+1));
            }});

        t.start();
        ArrayList l = new ArrayList();
        q.drainTo(l);
        assertTrue(l.size() >= SIZE);
        for (int i = 0; i < SIZE; ++i)
            assertEquals(l.get(i), new Integer(i));
        t.join();
        assertTrue(q.size() + l.size() >= SIZE);
    }

    /**
     * drainTo(c, n) empties first min(n, size) elements of queue into c
     */
    public void testDrainToN() {
        PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE*2);
        for (int i = 0; i < SIZE + 2; ++i) {
            for (int j = 0; j < SIZE; j++)
                assertTrue(q.offer(new Integer(j)));
            ArrayList l = new ArrayList();
            q.drainTo(l, i);
            int k = (i < SIZE) ? i : SIZE;
            assertEquals(k, l.size());
            assertEquals(SIZE-k, q.size());
            for (int j = 0; j < k; ++j)
                assertEquals(l.get(j), new Integer(j));
            while (q.poll() != null) ;
        }
    }

    /**
     * remove(null), contains(null) always return false
     */
    public void testNeverContainsNull() {
        Collection<?>[] qs = {
            new PriorityBlockingQueue<Object>(),
            populatedQueue(2),
        };

        for (Collection<?> q : qs) {
            assertFalse(q.contains(null));
            assertFalse(q.remove(null));
        }
    }

}
Revision:	1.53
Committed:	Sun Nov 23 22:27:06 2014 UTC (9 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.52:	+15 -0 lines
Log Message:	add tests for contains(null), remove(null)
#	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.Comparator;
14	import java.util.Iterator;
15	import java.util.NoSuchElementException;
16	import java.util.Queue;
17	import java.util.concurrent.PriorityBlockingQueue;
18	import java.util.concurrent.BlockingQueue;
19	import java.util.concurrent.CountDownLatch;
20	import java.util.concurrent.Executors;
21	import java.util.concurrent.ExecutorService;
22	import static java.util.concurrent.TimeUnit.MILLISECONDS;
23
24	public class PriorityBlockingQueueTest extends JSR166TestCase {
25
26	public static class Generic extends BlockingQueueTest {
27	protected BlockingQueue emptyCollection() {
28	return new PriorityBlockingQueue();
29	}
30	}
31
32	public static class InitialCapacity extends BlockingQueueTest {
33	protected BlockingQueue emptyCollection() {
34	return new PriorityBlockingQueue(SIZE);
35	}
36	}
37
38	public static void main(String[] args) {
39	junit.textui.TestRunner.run(suite());
40	}
41
42	public static Test suite() {
43	return newTestSuite(PriorityBlockingQueueTest.class,
44	new Generic().testSuite(),
45	new InitialCapacity().testSuite());
46	}
47
48	private static final int NOCAP = Integer.MAX_VALUE;
49
50	/** Sample Comparator */
51	static class MyReverseComparator implements Comparator {
52	public int compare(Object x, Object y) {
53	return ((Comparable)y).compareTo(x);
54	}
55	}
56
57	/**
58	* Returns a new queue of given size containing consecutive
59	* Integers 0 ... n.
60	*/
61	private PriorityBlockingQueue<Integer> populatedQueue(int n) {
62	PriorityBlockingQueue<Integer> q =
63	new PriorityBlockingQueue<Integer>(n);
64	assertTrue(q.isEmpty());
65	for (int i = n-1; i >= 0; i-=2)
66	assertTrue(q.offer(new Integer(i)));
67	for (int i = (n & 1); i < n; i+=2)
68	assertTrue(q.offer(new Integer(i)));
69	assertFalse(q.isEmpty());
70	assertEquals(NOCAP, q.remainingCapacity());
71	assertEquals(n, q.size());
72	return q;
73	}
74
75	/**
76	* A new queue has unbounded capacity
77	*/
78	public void testConstructor1() {
79	assertEquals(NOCAP, new PriorityBlockingQueue(SIZE).remainingCapacity());
80	}
81
82	/**
83	* Constructor throws IAE if capacity argument nonpositive
84	*/
85	public void testConstructor2() {
86	try {
87	new PriorityBlockingQueue(0);
88	shouldThrow();
89	} catch (IllegalArgumentException success) {}
90	}
91
92	/**
93	* Initializing from null Collection throws NPE
94	*/
95	public void testConstructor3() {
96	try {
97	new PriorityBlockingQueue(null);
98	shouldThrow();
99	} catch (NullPointerException success) {}
100	}
101
102	/**
103	* Initializing from Collection of null elements throws NPE
104	*/
105	public void testConstructor4() {
106	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
107	try {
108	new PriorityBlockingQueue(elements);
109	shouldThrow();
110	} catch (NullPointerException success) {}
111	}
112
113	/**
114	* Initializing from Collection with some null elements throws NPE
115	*/
116	public void testConstructor5() {
117	Integer[] ints = new Integer[SIZE];
118	for (int i = 0; i < SIZE-1; ++i)
119	ints[i] = i;
120	Collection<Integer> elements = Arrays.asList(ints);
121	try {
122	new PriorityBlockingQueue(elements);
123	shouldThrow();
124	} catch (NullPointerException success) {}
125	}
126
127	/**
128	* Queue contains all elements of collection used to initialize
129	*/
130	public void testConstructor6() {
131	Integer[] ints = new Integer[SIZE];
132	for (int i = 0; i < SIZE; ++i)
133	ints[i] = i;
134	PriorityBlockingQueue q = new PriorityBlockingQueue(Arrays.asList(ints));
135	for (int i = 0; i < SIZE; ++i)
136	assertEquals(ints[i], q.poll());
137	}
138
139	/**
140	* The comparator used in constructor is used
141	*/
142	public void testConstructor7() {
143	MyReverseComparator cmp = new MyReverseComparator();
144	PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE, cmp);
145	assertEquals(cmp, q.comparator());
146	Integer[] ints = new Integer[SIZE];
147	for (int i = 0; i < SIZE; ++i)
148	ints[i] = new Integer(i);
149	q.addAll(Arrays.asList(ints));
150	for (int i = SIZE-1; i >= 0; --i)
151	assertEquals(ints[i], q.poll());
152	}
153
154	/**
155	* isEmpty is true before add, false after
156	*/
157	public void testEmpty() {
158	PriorityBlockingQueue q = new PriorityBlockingQueue(2);
159	assertTrue(q.isEmpty());
160	assertEquals(NOCAP, q.remainingCapacity());
161	q.add(one);
162	assertFalse(q.isEmpty());
163	q.add(two);
164	q.remove();
165	q.remove();
166	assertTrue(q.isEmpty());
167	}
168
169	/**
170	* remainingCapacity does not change when elements added or removed,
171	* but size does
172	*/
173	public void testRemainingCapacity() {
174	PriorityBlockingQueue q = populatedQueue(SIZE);
175	for (int i = 0; i < SIZE; ++i) {
176	assertEquals(NOCAP, q.remainingCapacity());
177	assertEquals(SIZE-i, q.size());
178	q.remove();
179	}
180	for (int i = 0; i < SIZE; ++i) {
181	assertEquals(NOCAP, q.remainingCapacity());
182	assertEquals(i, q.size());
183	q.add(new Integer(i));
184	}
185	}
186
187	/**
188	* Offer of comparable element succeeds
189	*/
190	public void testOffer() {
191	PriorityBlockingQueue q = new PriorityBlockingQueue(1);
192	assertTrue(q.offer(zero));
193	assertTrue(q.offer(one));
194	}
195
196	/**
197	* Offer of non-Comparable throws CCE
198	*/
199	public void testOfferNonComparable() {
200	try {
201	PriorityBlockingQueue q = new PriorityBlockingQueue(1);
202	q.offer(new Object());
203	q.offer(new Object());
204	q.offer(new Object());
205	shouldThrow();
206	} catch (ClassCastException success) {}
207	}
208
209	/**
210	* add of comparable succeeds
211	*/
212	public void testAdd() {
213	PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
214	for (int i = 0; i < SIZE; ++i) {
215	assertEquals(i, q.size());
216	assertTrue(q.add(new Integer(i)));
217	}
218	}
219
220	/**
221	* addAll(this) throws IAE
222	*/
223	public void testAddAllSelf() {
224	try {
225	PriorityBlockingQueue q = populatedQueue(SIZE);
226	q.addAll(q);
227	shouldThrow();
228	} catch (IllegalArgumentException success) {}
229	}
230
231	/**
232	* addAll of a collection with any null elements throws NPE after
233	* possibly adding some elements
234	*/
235	public void testAddAll3() {
236	try {
237	PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
238	Integer[] ints = new Integer[SIZE];
239	for (int i = 0; i < SIZE-1; ++i)
240	ints[i] = new Integer(i);
241	q.addAll(Arrays.asList(ints));
242	shouldThrow();
243	} catch (NullPointerException success) {}
244	}
245
246	/**
247	* Queue contains all elements of successful addAll
248	*/
249	public void testAddAll5() {
250	Integer[] empty = new Integer[0];
251	Integer[] ints = new Integer[SIZE];
252	for (int i = SIZE-1; i >= 0; --i)
253	ints[i] = new Integer(i);
254	PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
255	assertFalse(q.addAll(Arrays.asList(empty)));
256	assertTrue(q.addAll(Arrays.asList(ints)));
257	for (int i = 0; i < SIZE; ++i)
258	assertEquals(ints[i], q.poll());
259	}
260
261	/**
262	* all elements successfully put are contained
263	*/
264	public void testPut() {
265	PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE);
266	for (int i = 0; i < SIZE; ++i) {
267	Integer I = new Integer(i);
268	q.put(I);
269	assertTrue(q.contains(I));
270	}
271	assertEquals(SIZE, q.size());
272	}
273
274	/**
275	* put doesn't block waiting for take
276	*/
277	public void testPutWithTake() throws InterruptedException {
278	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
279	final int size = 4;
280	Thread t = newStartedThread(new CheckedRunnable() {
281	public void realRun() {
282	for (int i = 0; i < size; i++)
283	q.put(new Integer(0));
284	}});
285
286	awaitTermination(t);
287	assertEquals(size, q.size());
288	q.take();
289	}
290
291	/**
292	* timed offer does not time out
293	*/
294	public void testTimedOffer() throws InterruptedException {
295	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
296	Thread t = newStartedThread(new CheckedRunnable() {
297	public void realRun() {
298	q.put(new Integer(0));
299	q.put(new Integer(0));
300	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, MILLISECONDS));
301	assertTrue(q.offer(new Integer(0), LONG_DELAY_MS, MILLISECONDS));
302	}});
303
304	awaitTermination(t);
305	}
306
307	/**
308	* take retrieves elements in priority order
309	*/
310	public void testTake() throws InterruptedException {
311	PriorityBlockingQueue q = populatedQueue(SIZE);
312	for (int i = 0; i < SIZE; ++i) {
313	assertEquals(i, q.take());
314	}
315	}
316
317	/**
318	* Take removes existing elements until empty, then blocks interruptibly
319	*/
320	public void testBlockingTake() throws InterruptedException {
321	final PriorityBlockingQueue q = populatedQueue(SIZE);
322	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
323	Thread t = newStartedThread(new CheckedRunnable() {
324	public void realRun() throws InterruptedException {
325	for (int i = 0; i < SIZE; ++i) {
326	assertEquals(i, q.take());
327	}
328
329	Thread.currentThread().interrupt();
330	try {
331	q.take();
332	shouldThrow();
333	} catch (InterruptedException success) {}
334	assertFalse(Thread.interrupted());
335
336	pleaseInterrupt.countDown();
337	try {
338	q.take();
339	shouldThrow();
340	} catch (InterruptedException success) {}
341	assertFalse(Thread.interrupted());
342	}});
343
344	await(pleaseInterrupt);
345	assertThreadStaysAlive(t);
346	t.interrupt();
347	awaitTermination(t);
348	}
349
350	/**
351	* poll succeeds unless empty
352	*/
353	public void testPoll() {
354	PriorityBlockingQueue q = populatedQueue(SIZE);
355	for (int i = 0; i < SIZE; ++i) {
356	assertEquals(i, q.poll());
357	}
358	assertNull(q.poll());
359	}
360
361	/**
362	* timed poll with zero timeout succeeds when non-empty, else times out
363	*/
364	public void testTimedPoll0() throws InterruptedException {
365	PriorityBlockingQueue q = populatedQueue(SIZE);
366	for (int i = 0; i < SIZE; ++i) {
367	assertEquals(i, q.poll(0, MILLISECONDS));
368	}
369	assertNull(q.poll(0, MILLISECONDS));
370	}
371
372	/**
373	* timed poll with nonzero timeout succeeds when non-empty, else times out
374	*/
375	public void testTimedPoll() throws InterruptedException {
376	PriorityBlockingQueue<Integer> q = populatedQueue(SIZE);
377	for (int i = 0; i < SIZE; ++i) {
378	long startTime = System.nanoTime();
379	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
380	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
381	}
382	long startTime = System.nanoTime();
383	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
384	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
385	checkEmpty(q);
386	}
387
388	/**
389	* Interrupted timed poll throws InterruptedException instead of
390	* returning timeout status
391	*/
392	public void testInterruptedTimedPoll() throws InterruptedException {
393	final BlockingQueue<Integer> q = populatedQueue(SIZE);
394	final CountDownLatch aboutToWait = new CountDownLatch(1);
395	Thread t = newStartedThread(new CheckedRunnable() {
396	public void realRun() throws InterruptedException {
397	for (int i = 0; i < SIZE; ++i) {
398	long t0 = System.nanoTime();
399	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
400	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
401	}
402	long t0 = System.nanoTime();
403	aboutToWait.countDown();
404	try {
405	q.poll(LONG_DELAY_MS, MILLISECONDS);
406	shouldThrow();
407	} catch (InterruptedException success) {
408	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
409	}
410	}});
411
412	aboutToWait.await();
413	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
414	t.interrupt();
415	awaitTermination(t, MEDIUM_DELAY_MS);
416	}
417
418	/**
419	* peek returns next element, or null if empty
420	*/
421	public void testPeek() {
422	PriorityBlockingQueue q = populatedQueue(SIZE);
423	for (int i = 0; i < SIZE; ++i) {
424	assertEquals(i, q.peek());
425	assertEquals(i, q.poll());
426	assertTrue(q.peek() == null \|\|
427	!q.peek().equals(i));
428	}
429	assertNull(q.peek());
430	}
431
432	/**
433	* element returns next element, or throws NSEE if empty
434	*/
435	public void testElement() {
436	PriorityBlockingQueue q = populatedQueue(SIZE);
437	for (int i = 0; i < SIZE; ++i) {
438	assertEquals(i, q.element());
439	assertEquals(i, q.poll());
440	}
441	try {
442	q.element();
443	shouldThrow();
444	} catch (NoSuchElementException success) {}
445	}
446
447	/**
448	* remove removes next element, or throws NSEE if empty
449	*/
450	public void testRemove() {
451	PriorityBlockingQueue q = populatedQueue(SIZE);
452	for (int i = 0; i < SIZE; ++i) {
453	assertEquals(i, q.remove());
454	}
455	try {
456	q.remove();
457	shouldThrow();
458	} catch (NoSuchElementException success) {}
459	}
460
461	/**
462	* contains(x) reports true when elements added but not yet removed
463	*/
464	public void testContains() {
465	PriorityBlockingQueue q = populatedQueue(SIZE);
466	for (int i = 0; i < SIZE; ++i) {
467	assertTrue(q.contains(new Integer(i)));
468	q.poll();
469	assertFalse(q.contains(new Integer(i)));
470	}
471	}
472
473	/**
474	* clear removes all elements
475	*/
476	public void testClear() {
477	PriorityBlockingQueue q = populatedQueue(SIZE);
478	q.clear();
479	assertTrue(q.isEmpty());
480	assertEquals(0, q.size());
481	q.add(one);
482	assertFalse(q.isEmpty());
483	assertTrue(q.contains(one));
484	q.clear();
485	assertTrue(q.isEmpty());
486	}
487
488	/**
489	* containsAll(c) is true when c contains a subset of elements
490	*/
491	public void testContainsAll() {
492	PriorityBlockingQueue q = populatedQueue(SIZE);
493	PriorityBlockingQueue p = new PriorityBlockingQueue(SIZE);
494	for (int i = 0; i < SIZE; ++i) {
495	assertTrue(q.containsAll(p));
496	assertFalse(p.containsAll(q));
497	p.add(new Integer(i));
498	}
499	assertTrue(p.containsAll(q));
500	}
501
502	/**
503	* retainAll(c) retains only those elements of c and reports true if changed
504	*/
505	public void testRetainAll() {
506	PriorityBlockingQueue q = populatedQueue(SIZE);
507	PriorityBlockingQueue p = populatedQueue(SIZE);
508	for (int i = 0; i < SIZE; ++i) {
509	boolean changed = q.retainAll(p);
510	if (i == 0)
511	assertFalse(changed);
512	else
513	assertTrue(changed);
514
515	assertTrue(q.containsAll(p));
516	assertEquals(SIZE-i, q.size());
517	p.remove();
518	}
519	}
520
521	/**
522	* removeAll(c) removes only those elements of c and reports true if changed
523	*/
524	public void testRemoveAll() {
525	for (int i = 1; i < SIZE; ++i) {
526	PriorityBlockingQueue q = populatedQueue(SIZE);
527	PriorityBlockingQueue p = populatedQueue(i);
528	assertTrue(q.removeAll(p));
529	assertEquals(SIZE-i, q.size());
530	for (int j = 0; j < i; ++j) {
531	Integer I = (Integer)(p.remove());
532	assertFalse(q.contains(I));
533	}
534	}
535	}
536
537	/**
538	* toArray contains all elements
539	*/
540	public void testToArray() throws InterruptedException {
541	PriorityBlockingQueue q = populatedQueue(SIZE);
542	Object[] o = q.toArray();
543	Arrays.sort(o);
544	for (int i = 0; i < o.length; i++)
545	assertSame(o[i], q.take());
546	}
547
548	/**
549	* toArray(a) contains all elements
550	*/
551	public void testToArray2() throws InterruptedException {
552	PriorityBlockingQueue<Integer> q = populatedQueue(SIZE);
553	Integer[] ints = new Integer[SIZE];
554	Integer[] array = q.toArray(ints);
555	assertSame(ints, array);
556	Arrays.sort(ints);
557	for (int i = 0; i < ints.length; i++)
558	assertSame(ints[i], q.take());
559	}
560
561	/**
562	* toArray(incompatible array type) throws ArrayStoreException
563	*/
564	public void testToArray1_BadArg() {
565	PriorityBlockingQueue q = populatedQueue(SIZE);
566	try {
567	q.toArray(new String[10]);
568	shouldThrow();
569	} catch (ArrayStoreException success) {}
570	}
571
572	/**
573	* iterator iterates through all elements
574	*/
575	public void testIterator() {
576	PriorityBlockingQueue q = populatedQueue(SIZE);
577	int i = 0;
578	Iterator it = q.iterator();
579	while (it.hasNext()) {
580	assertTrue(q.contains(it.next()));
581	++i;
582	}
583	assertEquals(i, SIZE);
584	}
585
586	/**
587	* iterator.remove removes current element
588	*/
589	public void testIteratorRemove() {
590	final PriorityBlockingQueue q = new PriorityBlockingQueue(3);
591	q.add(new Integer(2));
592	q.add(new Integer(1));
593	q.add(new Integer(3));
594
595	Iterator it = q.iterator();
596	it.next();
597	it.remove();
598
599	it = q.iterator();
600	assertEquals(it.next(), new Integer(2));
601	assertEquals(it.next(), new Integer(3));
602	assertFalse(it.hasNext());
603	}
604
605	/**
606	* toString contains toStrings of elements
607	*/
608	public void testToString() {
609	PriorityBlockingQueue q = populatedQueue(SIZE);
610	String s = q.toString();
611	for (int i = 0; i < SIZE; ++i) {
612	assertTrue(s.contains(String.valueOf(i)));
613	}
614	}
615
616	/**
617	* timed poll transfers elements across Executor tasks
618	*/
619	public void testPollInExecutor() {
620	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
621	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
622	ExecutorService executor = Executors.newFixedThreadPool(2);
623	executor.execute(new CheckedRunnable() {
624	public void realRun() throws InterruptedException {
625	assertNull(q.poll());
626	threadsStarted.await();
627	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
628	checkEmpty(q);
629	}});
630
631	executor.execute(new CheckedRunnable() {
632	public void realRun() throws InterruptedException {
633	threadsStarted.await();
634	q.put(one);
635	}});
636
637	joinPool(executor);
638	}
639
640	/**
641	* A deserialized serialized queue has same elements
642	*/
643	public void testSerialization() throws Exception {
644	Queue x = populatedQueue(SIZE);
645	Queue y = serialClone(x);
646
647	assertNotSame(x, y);
648	assertEquals(x.size(), y.size());
649	while (!x.isEmpty()) {
650	assertFalse(y.isEmpty());
651	assertEquals(x.remove(), y.remove());
652	}
653	assertTrue(y.isEmpty());
654	}
655
656	/**
657	* drainTo(c) empties queue into another collection c
658	*/
659	public void testDrainTo() {
660	PriorityBlockingQueue q = populatedQueue(SIZE);
661	ArrayList l = new ArrayList();
662	q.drainTo(l);
663	assertEquals(0, q.size());
664	assertEquals(SIZE, l.size());
665	for (int i = 0; i < SIZE; ++i)
666	assertEquals(l.get(i), new Integer(i));
667	q.add(zero);
668	q.add(one);
669	assertFalse(q.isEmpty());
670	assertTrue(q.contains(zero));
671	assertTrue(q.contains(one));
672	l.clear();
673	q.drainTo(l);
674	assertEquals(0, q.size());
675	assertEquals(2, l.size());
676	for (int i = 0; i < 2; ++i)
677	assertEquals(l.get(i), new Integer(i));
678	}
679
680	/**
681	* drainTo empties queue
682	*/
683	public void testDrainToWithActivePut() throws InterruptedException {
684	final PriorityBlockingQueue q = populatedQueue(SIZE);
685	Thread t = new Thread(new CheckedRunnable() {
686	public void realRun() {
687	q.put(new Integer(SIZE+1));
688	}});
689
690	t.start();
691	ArrayList l = new ArrayList();
692	q.drainTo(l);
693	assertTrue(l.size() >= SIZE);
694	for (int i = 0; i < SIZE; ++i)
695	assertEquals(l.get(i), new Integer(i));
696	t.join();
697	assertTrue(q.size() + l.size() >= SIZE);
698	}
699
700	/**
701	* drainTo(c, n) empties first min(n, size) elements of queue into c
702	*/
703	public void testDrainToN() {
704	PriorityBlockingQueue q = new PriorityBlockingQueue(SIZE*2);
705	for (int i = 0; i < SIZE + 2; ++i) {
706	for (int j = 0; j < SIZE; j++)
707	assertTrue(q.offer(new Integer(j)));
708	ArrayList l = new ArrayList();
709	q.drainTo(l, i);
710	int k = (i < SIZE) ? i : SIZE;
711	assertEquals(k, l.size());
712	assertEquals(SIZE-k, q.size());
713	for (int j = 0; j < k; ++j)
714	assertEquals(l.get(j), new Integer(j));
715	while (q.poll() != null) ;
716	}
717	}
718
719	/**
720	* remove(null), contains(null) always return false
721	*/
722	public void testNeverContainsNull() {
723	Collection<?>[] qs = {
724	new PriorityBlockingQueue<Object>(),
725	populatedQueue(2),
726	};
727
728	for (Collection<?> q : qs) {
729	assertFalse(q.contains(null));
730	assertFalse(q.remove(null));
731	}
732	}
733
734	}