delayqueuetest.java

SRI international 发布的OAA框架软件

/*
 * 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 edu.emory.mathcs.backport.java.util.*;
import edu.emory.mathcs.backport.java.util.concurrent.*;
import java.util.*;
import edu.emory.mathcs.backport.java.util.concurrent.helpers.*;

public class DelayQueueTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run (suite());
    }

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

    private static final int NOCAP = Integer.MAX_VALUE;

    /**
     * A delayed implementation for testing.
     * Most  tests use Pseudodelays, where delays are all elapsed
     * (so, no blocking solely for delays) but are still ordered
     */
    static class PDelay implements Delayed {
        int pseudodelay;
        PDelay(int i) { pseudodelay = Integer.MIN_VALUE + i; }
        public int compareTo(Object y) {
            int i = pseudodelay;
            int j = ((PDelay)y).pseudodelay;
            if (i < j) return -1;
            if (i > j) return 1;
            return 0;
        }

        public int compareTo(Delayed y) {
            int i = pseudodelay;
            int j = ((PDelay)y).pseudodelay;
            if (i < j) return -1;
            if (i > j) return 1;
            return 0;
        }

        public boolean equals(Object other) {
            return ((PDelay)other).pseudodelay == pseudodelay;
        }
        public boolean equals(PDelay other) {
            return ((PDelay)other).pseudodelay == pseudodelay;
        }


        public long getDelay(TimeUnit ignore) {
            return pseudodelay;
        }
        public int intValue() {
            return pseudodelay;
        }

        public String toString() {
            return String.valueOf(pseudodelay);
        }
    }


    /**
     * Delayed implementation that actually delays
     */
    static class NanoDelay implements Delayed {
        long trigger;
        NanoDelay(long i) {
            trigger = Utils.nanoTime() + i;
        }
        public int compareTo(Object y) {
            long i = trigger;
            long j = ((NanoDelay)y).trigger;
            if (i < j) return -1;
            if (i > j) return 1;
            return 0;
        }

        public int compareTo(Delayed y) {
            long i = trigger;
            long j = ((NanoDelay)y).trigger;
            if (i < j) return -1;
            if (i > j) return 1;
            return 0;
        }

        public boolean equals(Object other) {
            return ((NanoDelay)other).trigger == trigger;
        }
        public boolean equals(NanoDelay other) {
            return ((NanoDelay)other).trigger == trigger;
        }

        public long getDelay(TimeUnit unit) {
            long n = trigger - Utils.nanoTime();
            return unit.convert(n, TimeUnit.NANOSECONDS);
        }

        public long getTriggerTime() {
            return trigger;
        }

        public String toString() {
            return String.valueOf(trigger);
        }
    }


    /**
     * Create a queue of given size containing consecutive
     * PDelays 0 ... n.
     */
    private DelayQueue populatedQueue(int n) {
        DelayQueue q = new DelayQueue();
        assertTrue(q.isEmpty());
        for(int i = n-1; i >= 0; i-=2)
            assertTrue(q.offer(new PDelay(i)));
        for(int i = (n & 1); i < n; i+=2)
            assertTrue(q.offer(new PDelay(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 DelayQueue().remainingCapacity());
    }

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

    /**
     * Initializing from Collection of null elements throws NPE
     */
    public void testConstructor4() {
        try {
            PDelay[] ints = new PDelay[SIZE];
            DelayQueue q = new DelayQueue(Arrays.asList(ints));
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

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

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

    /**
     * isEmpty is true before add, false after
     */
    public void testEmpty() {
        DelayQueue q = new DelayQueue();
        assertTrue(q.isEmpty());
        assertEquals(NOCAP, q.remainingCapacity());
        q.add(new PDelay(1));
        assertFalse(q.isEmpty());
        q.add(new PDelay(2));
        q.remove();
        q.remove();
        assertTrue(q.isEmpty());
    }

    /**
     * remainingCapacity does not change when elementa added or removed,
     * but size does
     */
    public void testRemainingCapacity() {
        DelayQueue 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 PDelay(i));
        }
    }

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

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

    /**
     * offer non-null succeeds
     */
    public void testOffer() {
        DelayQueue q = new DelayQueue();
        assertTrue(q.offer(new PDelay(0)));
        assertTrue(q.offer(new PDelay(1)));
    }

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

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


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

    /**
     * addAll of a collection with null elements throws NPE
     */
    public void testAddAll2() {
        try {
            DelayQueue q = new DelayQueue();
            PDelay[] ints = new PDelay[SIZE];
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }
    /**
     * addAll of a collection with any null elements throws NPE after
     * possibly adding some elements
     */
    public void testAddAll3() {
        try {
            DelayQueue q = new DelayQueue();
            PDelay[] ints = new PDelay[SIZE];
            for (int i = 0; i < SIZE-1; ++i)
                ints[i] = new PDelay(i);
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

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

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

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

    /**
     * put doesn't block waiting for take
     */
    public void testPutWithTake() {
        final DelayQueue q = new DelayQueue();
        Thread t = new Thread(new Runnable() {
                public void run() {
                    int added = 0;
                    try {
                        q.put(new PDelay(0));
                        ++added;
                        q.put(new PDelay(0));
                        ++added;
                        q.put(new PDelay(0));
                        ++added;
                        q.put(new PDelay(0));
                        ++added;
                        threadAssertTrue(added == 4);
                    } finally {
                    }
                }
            });
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            q.take();
            t.interrupt();
            t.join();
        } catch (Exception e){
            unexpectedException();
        }
    }

    /**
     * timed offer does not time out
     */
    public void testTimedOffer() {
        final DelayQueue q = new DelayQueue();
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        q.put(new PDelay(0));
                        q.put(new PDelay(0));
                        threadAssertTrue(q.offer(new PDelay(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
                        threadAssertTrue(q.offer(new PDelay(0), LONG_DELAY_MS, TimeUnit.MILLISECONDS));
                    } finally { }
                }
            });

        try {
            t.start();
            Thread.sleep(SMALL_DELAY_MS);
            t.interrupt();
            t.join();
        } catch (Exception e){
            unexpectedException();
        }
    }

    /**
     * take retrieves elements in priority order
     */
    public void testTake() {
        try {
            DelayQueue q = populatedQueue(SIZE);
            for (int i = 0; i < SIZE; ++i) {
                assertEquals(new PDelay(i), ((PDelay)q.take()));
            }
        } catch (InterruptedException e){
            unexpectedException();
        }
    }

    /**
     * take blocks interruptibly when empty
     */
    public void testTakeFromEmpty() {
        final DelayQueue q = new DelayQueue();
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        q.take();
                        threadShouldThrow();
                    } catch (InterruptedException success){ }
                }
            });
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            t.interrupt();
            t.join();
        } catch (Exception e){
            unexpectedException();
        }
    }

    /**
     * Take removes existing elements until empty, then blocks interruptibly
     */
    public void testBlockingTake() {
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        DelayQueue q = populatedQueue(SIZE);
                        for (int i = 0; i < SIZE; ++i) {
                            threadAssertEquals(new PDelay(i), ((PDelay)q.take()));
                        }
                        q.take();
                        threadShouldThrow();
                    } catch (InterruptedException success){
                    }
                }});
        t.start();
        try {
           Thread.sleep(SHORT_DELAY_MS);
           t.interrupt();
           t.join();
        }
        catch (InterruptedException ie) {
            unexpectedException();
        }
    }


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