arrayblockingqueuetest.java

来自「SRI international 发布的OAA框架软件」· Java 代码 · 共 1,061 行 · 第 1/3 页

     *  toArray contains all elements
     */
    public void testToArray() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        Object[] o = q.toArray();
        try {
        for(int i = 0; i < o.length; i++)
            assertEquals(o[i], q.take());
        } catch (InterruptedException e){
            unexpectedException();
        }
    }

    /**
     * toArray(a) contains all elements
     */
    public void testToArray2() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        Integer[] ints = new Integer[SIZE];
        ints = (Integer[])q.toArray(ints);
        try {
            for(int i = 0; i < ints.length; i++)
                assertEquals(ints[i], q.take());
        } catch (InterruptedException e){
            unexpectedException();
        }
    }

    /**
     * toArray(null) throws NPE
     */
    public void testToArray_BadArg() {
        try {
            ArrayBlockingQueue q = populatedQueue(SIZE);
            Object o[] = q.toArray(null);
            shouldThrow();
        } catch(NullPointerException success){}
    }

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


    /**
     * iterator iterates through all elements
     */
    public void testIterator() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        Iterator it = q.iterator();
        try {
            while(it.hasNext()){
                assertEquals(it.next(), q.take());
            }
        } catch (InterruptedException e){
            unexpectedException();
        }
    }

    /**
     * iterator.remove removes current element
     */
    public void testIteratorRemove () {
        final ArrayBlockingQueue q = new ArrayBlockingQueue(3);
        q.add(two);
        q.add(one);
        q.add(three);

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

        it = q.iterator();
        assertEquals(it.next(), one);
        assertEquals(it.next(), three);
        assertFalse(it.hasNext());
    }

    /**
     * iterator ordering is FIFO
     */
    public void testIteratorOrdering() {
        final ArrayBlockingQueue q = new ArrayBlockingQueue(3);
        q.add(one);
        q.add(two);
        q.add(three);

        assertEquals("queue should be full", 0, q.remainingCapacity());

        int k = 0;
        for (Iterator it = q.iterator(); it.hasNext();) {
            int i = ((Integer)(it.next())).intValue();
            assertEquals(++k, i);
        }
        assertEquals(3, k);
    }

    /**
     * Modifications do not cause iterators to fail
     */
    public void testWeaklyConsistentIteration () {
        final ArrayBlockingQueue q = new ArrayBlockingQueue(3);
        q.add(one);
        q.add(two);
        q.add(three);
        try {
            for (Iterator it = q.iterator(); it.hasNext();) {
                q.remove();
                it.next();
            }
        }
        catch (ConcurrentModificationException e) {
            unexpectedException();
        }
        assertEquals(0, q.size());
    }


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


    /**
     * offer transfers elements across Executor tasks
     */
    public void testOfferInExecutor() {
        final ArrayBlockingQueue q = new ArrayBlockingQueue(2);
        q.add(one);
        q.add(two);
        ExecutorService executor = Executors.newFixedThreadPool(2);
        executor.execute(new Runnable() {
            public void run() {
                threadAssertFalse(q.offer(three));
                try {
                    threadAssertTrue(q.offer(three, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
                    threadAssertEquals(0, q.remainingCapacity());
                }
                catch (InterruptedException e) {
                    threadUnexpectedException();
                }
            }
        });

        executor.execute(new Runnable() {
            public void run() {
                try {
                    Thread.sleep(SMALL_DELAY_MS);
                    threadAssertEquals(one, q.take());
                }
                catch (InterruptedException e) {
                    threadUnexpectedException();
                }
            }
        });

        joinPool(executor);

    }

    /**
     * poll retrieves elements across Executor threads
     */
    public void testPollInExecutor() {
        final ArrayBlockingQueue q = new ArrayBlockingQueue(2);
        ExecutorService executor = Executors.newFixedThreadPool(2);
        executor.execute(new Runnable() {
            public void run() {
                threadAssertNull(q.poll());
                try {
                    threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
                    threadAssertTrue(q.isEmpty());
                }
                catch (InterruptedException e) {
                    threadUnexpectedException();
                }
            }
        });

        executor.execute(new Runnable() {
            public void run() {
                try {
                    Thread.sleep(SMALL_DELAY_MS);
                    q.put(one);
                }
                catch (InterruptedException e) {
                    threadUnexpectedException();
                }
            }
        });

        joinPool(executor);
    }

    /**
     * A deserialized serialized queue has same elements in same order
     */
    public void testSerialization() {
        ArrayBlockingQueue q = populatedQueue(SIZE);

        try {
            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));
            ArrayBlockingQueue r = (ArrayBlockingQueue)in.readObject();
            assertEquals(q.size(), r.size());
            while (!q.isEmpty())
                assertEquals(q.remove(), r.remove());
        } catch(Exception e){
            e.printStackTrace();
            unexpectedException();
        }
    }

    /**
     * drainTo(null) throws NPE
     */
    public void testDrainToNull() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        try {
            q.drainTo(null);
            shouldThrow();
        } catch(NullPointerException success) {
        }
    }

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

    /**
     * drainTo(c) empties queue into another collection c
     */
    public void testDrainTo() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        ArrayList l = new ArrayList();
        q.drainTo(l);
        assertEquals(q.size(), 0);
        assertEquals(l.size(), 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(q.size(), 0);
        assertEquals(l.size(), 2);
        for (int i = 0; i < 2; ++i)
            assertEquals(l.get(i), new Integer(i));
    }

    /**
     * drainTo empties full queue, unblocking a waiting put.
     */
    public void testDrainToWithActivePut() {
        final ArrayBlockingQueue q = populatedQueue(SIZE);
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        q.put(new Integer(SIZE+1));
                    } catch (InterruptedException ie){
                        threadUnexpectedException();
                    }
                }
            });
        try {
            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);
        } catch(Exception e){
            unexpectedException();
        }
    }

    /**
     * drainTo(null, n) throws NPE
     */
    public void testDrainToNullN() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        try {
            q.drainTo(null, 0);
            shouldThrow();
        } catch(NullPointerException success) {
        }
    }

    /**
     * drainTo(this, n) throws IAE
     */
    public void testDrainToSelfN() {
        ArrayBlockingQueue q = populatedQueue(SIZE);
        try {
            q.drainTo(q, 0);
            shouldThrow();
        } catch(IllegalArgumentException success) {
        }
    }

    /**
     * drainTo(c, n) empties first max {n, size} elements of queue into c
     */
    public void testDrainToN() {
        ArrayBlockingQueue q = new ArrayBlockingQueue(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(l.size(), k);
            assertEquals(q.size(), SIZE-k);
            for (int j = 0; j < k; ++j)
                assertEquals(l.get(j), new Integer(j));
            while (q.poll() != null) ;
        }
    }

}