arrayblockingqueuetest.java

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/*
 * 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.io.*;
import java.util.*;

public class ArrayBlockingQueueTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run (suite());
    }
    public static Test suite() {
        return new TestSuite(ArrayBlockingQueueTest.class);
    }

    /**
     * Create a queue of given size containing consecutive
     * Integers 0 ... n.
     */
    private ArrayBlockingQueue populatedQueue(int n) {
        ArrayBlockingQueue q = new ArrayBlockingQueue(n);
        assertTrue(q.isEmpty());
        for(int i = 0; i < n; i++)
            assertTrue(q.offer(new Integer(i)));
        assertFalse(q.isEmpty());
        assertEquals(0, q.remainingCapacity());
        assertEquals(n, q.size());
        return q;
    }

    /**
     * A new queue has the indicated capacity
     */
    public void testConstructor1() {
        assertEquals(SIZE, new ArrayBlockingQueue(SIZE).remainingCapacity());
    }

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

    /**
     * Initializing from null Collection throws NPE
     */
    public void testConstructor3() {
        try {
            ArrayBlockingQueue q = new ArrayBlockingQueue(1, true, null);
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

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

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

    /**
     * Initializing from too large collection throws IAE
     */
    public void testConstructor6() {
        try {
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE; ++i)
                ints[i] = new Integer(i);
            ArrayBlockingQueue q = new ArrayBlockingQueue(1, false, Arrays.asList(ints));
            shouldThrow();
        }
        catch (IllegalArgumentException success) {}
    }

    /**
     * Queue contains all elements of collection used to initialize
     */
    public void testConstructor7() {
        try {
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE; ++i)
                ints[i] = new Integer(i);
            ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE, true, Arrays.asList(ints));
            for (int i = 0; i < SIZE; ++i)
                assertEquals(ints[i], q.poll());
        }
        finally {}
    }

    /**
     * Queue transitions from empty to full when elements added
     */
    public void testEmptyFull() {
        ArrayBlockingQueue q = new ArrayBlockingQueue(2);
        assertTrue(q.isEmpty());
        assertEquals(2, q.remainingCapacity());
        q.add(one);
        assertFalse(q.isEmpty());
        q.add(two);
        assertFalse(q.isEmpty());
        assertEquals(0, q.remainingCapacity());
        assertFalse(q.offer(three));
    }

    /**
     * remainingCapacity decreases on add, increases on remove
     */
    public void testRemainingCapacity() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.remainingCapacity());
            assertEquals(SIZE-i, q.size());
            q.remove();
        }
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(SIZE-i, q.remainingCapacity());
            assertEquals(i, q.size());
            q.add(new Integer(i));
        }
    }

    /**
     *  offer(null) throws NPE
     */
    public void testOfferNull() {
        try {
            ArrayBlockingQueue q = new ArrayBlockingQueue(1);
            q.offer(null);
            shouldThrow();
        } catch (NullPointerException success) { }
    }

    /**
     *  add(null) throws NPE
     */
    public void testAddNull() {
        try {
            ArrayBlockingQueue q = new ArrayBlockingQueue(1);
            q.add(null);
            shouldThrow();
        } catch (NullPointerException success) { }
    }

    /**
     * Offer succeeds if not full; fails if full
     */
    public void testOffer() {
        ArrayBlockingQueue q = new ArrayBlockingQueue(1);
        assertTrue(q.offer(zero));
        assertFalse(q.offer(one));
    }

    /**
     * add succeeds if not full; throws ISE if full
     */
    public void testAdd() {
        try {
            ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE);
            for (int i = 0; i < SIZE; ++i) {
                assertTrue(q.add(new Integer(i)));
            }
            assertEquals(0, q.remainingCapacity());
            q.add(new Integer(SIZE));
        } catch (IllegalStateException success){
        }
    }

    /**
     *  addAll(null) throws NPE
     */
    public void testAddAll1() {
        try {
            ArrayBlockingQueue q = new ArrayBlockingQueue(1);
            q.addAll(null);
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

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


    /**
     *  addAll of a collection with null elements throws NPE
     */
    public void testAddAll2() {
        try {
            ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE);
            Integer[] ints = new Integer[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 {
            ArrayBlockingQueue q = new ArrayBlockingQueue(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) {}
    }
    /**
     * addAll throws ISE if not enough room
     */
    public void testAddAll4() {
        try {
            ArrayBlockingQueue q = new ArrayBlockingQueue(1);
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE; ++i)
                ints[i] = new Integer(i);
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        }
        catch (IllegalStateException success) {}
    }
    /**
     * Queue contains all elements, in traversal order, of successful addAll
     */
    public void testAddAll5() {
        try {
            Integer[] empty = new Integer[0];
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE; ++i)
                ints[i] = new Integer(i);
            ArrayBlockingQueue q = new ArrayBlockingQueue(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());
        }
        finally {}
    }

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

    /**
     * all elements successfully put are contained
     */
     public void testPut() {
         try {
             ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE);
             for (int i = 0; i < SIZE; ++i) {
                 Integer I = new Integer(i);
                 q.put(I);
                 assertTrue(q.contains(I));
             }
             assertEquals(0, q.remainingCapacity());
         }
        catch (InterruptedException ie) {
            unexpectedException();
        }
    }

    /**
     * put blocks interruptibly if full
     */
    public void testBlockingPut() {
        final ArrayBlockingQueue q = new ArrayBlockingQueue(SIZE);
        Thread t = new Thread(new Runnable() {
                public void run() {
                    int added = 0;
                    try {
                        for (int i = 0; i < SIZE; ++i) {
                            q.put(new Integer(i));
                            ++added;
                        }
                        q.put(new Integer(SIZE));
                        threadShouldThrow();
                    } catch (InterruptedException ie){
                        threadAssertEquals(added, SIZE);
                    }
                }});
        try {
            t.start();
           Thread.sleep(MEDIUM_DELAY_MS);
           t.interrupt();
           t.join();
        }
        catch (InterruptedException ie) {
            unexpectedException();
        }
    }

    /**
     * put blocks waiting for take when full
     */
    public void testPutWithTake() {
        final ArrayBlockingQueue q = new ArrayBlockingQueue(2);
        Thread t = new Thread(new Runnable() {