linkedblockingdequetest.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
 */

import junit.framework.*;
import java.util.*;
import edu.emory.mathcs.backport.java.util.concurrent.*;
import java.io.*;

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

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

    /**
     * Create a deque of given size containing consecutive
     * Integers 0 ... n.
     */
    private LinkedBlockingDeque populatedDeque(int n) {
        LinkedBlockingDeque q = new LinkedBlockingDeque(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;
    }

    /**
     * isEmpty is true before add, false after
     */
    public void testEmpty() {
        LinkedBlockingDeque q = new LinkedBlockingDeque();
        assertTrue(q.isEmpty());
        q.add(new Integer(1));
        assertFalse(q.isEmpty());
        q.add(new Integer(2));
        q.removeFirst();
        q.removeFirst();
        assertTrue(q.isEmpty());
    }

    /**
     * size changes when elements added and removed
     */
    public void testSize() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(SIZE-i, q.size());
            q.removeFirst();
        }
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.size());
            q.add(new Integer(i));
        }
    }

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

    /**
     * OfferFirst succeeds
     */
    public void testOfferFirst() {
        LinkedBlockingDeque q = new LinkedBlockingDeque();
        assertTrue(q.offerFirst(new Integer(0)));
        assertTrue(q.offerFirst(new Integer(1)));
    }

    /**
     * OfferLast succeeds
     */
    public void testOfferLast() {
        LinkedBlockingDeque q = new LinkedBlockingDeque();
        assertTrue(q.offerLast(new Integer(0)));
        assertTrue(q.offerLast(new Integer(1)));
    }

    /**
     *  pollFirst succeeds unless empty
     */
    public void testPollFirst() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.pollFirst()).intValue());
        }
        assertNull(q.pollFirst());
    }

    /**
     *  pollLast succeeds unless empty
     */
    public void testPollLast() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = SIZE-1; i >= 0; --i) {
            assertEquals(i, ((Integer)q.pollLast()).intValue());
        }
        assertNull(q.pollLast());
    }

    /**
     *  peekFirst returns next element, or null if empty
     */
    public void testPeekFirst() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.peekFirst()).intValue());
            q.pollFirst();
            assertTrue(q.peekFirst() == null ||
                       i != ((Integer)q.peekFirst()).intValue());
        }
        assertNull(q.peekFirst());
    }

    /**
     *  peek returns next element, or null if empty
     */
    public void testPeek() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.peek()).intValue());
            q.pollFirst();
            assertTrue(q.peek() == null ||
                       i != ((Integer)q.peek()).intValue());
        }
        assertNull(q.peek());
    }

    /**
     *  peekLast returns next element, or null if empty
     */
    public void testPeekLast() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = SIZE-1; i >= 0; --i) {
            assertEquals(i, ((Integer)q.peekLast()).intValue());
            q.pollLast();
            assertTrue(q.peekLast() == null ||
                       i != ((Integer)q.peekLast()).intValue());
        }
        assertNull(q.peekLast());
    }

    /**
     * getFirst returns next getFirst, or throws NSEE if empty
     */
    public void testFirstElement() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.getFirst()).intValue());
            q.pollFirst();
        }
        try {
            q.getFirst();
            shouldThrow();
        }
        catch (NoSuchElementException success) {}
    }

    /**
     *  getLast returns next element, or throws NSEE if empty
     */
    public void testLastElement() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = SIZE-1; i >= 0; --i) {
            assertEquals(i, ((Integer)q.getLast()).intValue());
            q.pollLast();
        }
        try {
            q.getLast();
            shouldThrow();
        }
        catch (NoSuchElementException success) {}
        assertNull(q.peekLast());
    }

    /**
     *  removeFirst removes next element, or throws NSEE if empty
     */
    public void testRemoveFirst() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.removeFirst()).intValue());
        }
        try {
            q.removeFirst();
            shouldThrow();
        } catch (NoSuchElementException success){
        }
    }

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

    /**
     * removeFirstOccurrence(x) removes x and returns true if present
     */
    public void testRemoveFirstOccurrence() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 1; i < SIZE; i+=2) {
            assertTrue(q.removeFirstOccurrence(new Integer(i)));
        }
        for (int i = 0; i < SIZE; i+=2) {
            assertTrue(q.removeFirstOccurrence(new Integer(i)));
            assertFalse(q.removeFirstOccurrence(new Integer(i+1)));
        }
        assertTrue(q.isEmpty());
    }

    /**
     * removeLastOccurrence(x) removes x and returns true if present
     */
    public void testRemoveLastOccurrence() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 1; i < SIZE; i+=2) {
            assertTrue(q.removeLastOccurrence(new Integer(i)));
        }
        for (int i = 0; i < SIZE; i+=2) {
            assertTrue(q.removeLastOccurrence(new Integer(i)));
            assertFalse(q.removeLastOccurrence(new Integer(i+1)));
        }
        assertTrue(q.isEmpty());
    }

    /**
     * peekFirst returns element inserted with addFirst
     */
    public void testAddFirst() {
        LinkedBlockingDeque q = populatedDeque(3);
        q.pollLast();
        q.addFirst(four);
        assertEquals(four,q.peekFirst());
    }

    /**
     * peekLast returns element inserted with addLast
     */
    public void testAddLast() {
        LinkedBlockingDeque q = populatedDeque(3);
        q.pollLast();
        q.addLast(four);
        assertEquals(four,q.peekLast());
    }


    /**
     * A new deque has the indicated capacity, or Integer.MAX_VALUE if
     * none given
     */
    public void testConstructor1() {
        assertEquals(SIZE, new LinkedBlockingDeque(SIZE).remainingCapacity());
        assertEquals(Integer.MAX_VALUE, new LinkedBlockingDeque().remainingCapacity());
    }

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

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

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

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

    /**
     * Deque transitions from empty to full when elements added
     */
    public void testEmptyFull() {
        LinkedBlockingDeque q = new LinkedBlockingDeque(2);
        assertTrue(q.isEmpty());
        assertEquals("should have room for 2", 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() {
        LinkedBlockingDeque q = populatedDeque(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 {
            LinkedBlockingDeque q = new LinkedBlockingDeque(1);
            q.offer(null);
            shouldThrow();
        } catch (NullPointerException success) { }
    }

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

    /**
     * push(null) throws NPE
     */
    public void testPushNull() {
        try {
            LinkedBlockingDeque q = new LinkedBlockingDeque(1);
            q.push(null);
            shouldThrow();
        } catch (NullPointerException success) { }
    }

    /**
     * push succeeds if not full; throws ISE if full
     */
    public void testPush() {
        try {
            LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
            for (int i = 0; i < SIZE; ++i) {
                Integer I = new Integer(i);
                q.push(I);
                assertEquals(I, q.peek());
            }
            assertEquals(0, q.remainingCapacity());
            q.push(new Integer(SIZE));
        } catch (IllegalStateException success){
        }
    }

    /**
     * peekFirst returns element inserted with push
     */
    public void testPushWithPeek() {
        LinkedBlockingDeque q = populatedDeque(3);
        q.pollLast();
        q.push(four);
        assertEquals(four,q.peekFirst());
    }


    /**
     *  pop removes next element, or throws NSEE if empty
     */
    public void testPop() {
        LinkedBlockingDeque q = populatedDeque(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.pop()).intValue());
        }
        try {
            q.pop();
            shouldThrow();
        } catch (NoSuchElementException success){
        }
    }


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

    /**
     * add succeeds if not full; throws ISE if full