Examples of java.util.concurrent.BlockingQueue.remainingCapacity()

Class java.util.concurrent.BlockingQueue

Examples of java.util.concurrent.BlockingQueue.remainingCapacity()

java.util.concurrent.BlockingQueue.remainingCapacity()
Returns the number of additional elements that this queue can ideally (in the absence of memory or resource constraints) accept without blocking, or {@code Integer.MAX_VALUE} if there is no intrinsiclimit.
Note that you cannot always tell if an attempt to insert an element will succeed by inspecting {@code remainingCapacity}because it may be the case that another thread is about to insert or remove an element. @return the remaining capacity

     * remove(x) removes x and returns true if present
     * TODO: move to superclass CollectionTest.java
     */
    public void testRemoveElement() {
        final BlockingQueue q = emptyCollection();
        final int size = Math.min(q.remainingCapacity(), SIZE);
        final Object[] elts = new Object[size];
        assertFalse(q.contains(makeElement(99)));
        assertFalse(q.remove(makeElement(99)));
        checkEmpty(q);
        for (int i = 0; i < size; i++)

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        for (int i = 0; i < SIZE; ++i) {
            Integer I = new Integer(i);
            q.put(I);
            assertTrue(q.contains(I));
        }
        assertEquals(0, q.remainingCapacity());
    }


    /**
     * put blocks interruptibly if full
     */

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        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                for (int i = 0; i < SIZE; ++i)
                    q.put(i);
                assertEquals(SIZE, q.size());
                assertEquals(0, q.remainingCapacity());


                Thread.currentThread().interrupt();
                try {
                    q.put(99);
                    shouldThrow();

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        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
        assertEquals(SIZE, q.size());
        assertEquals(0, q.remainingCapacity());
    }


    /**
     * put blocks interruptibly waiting for take when full
     */

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                assertFalse(Thread.interrupted());
            }
        });


        await(pleaseTake);
        assertEquals(0, q.remainingCapacity());
        assertEquals(0, q.take());


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

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        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
        assertEquals(0, q.remainingCapacity());
    }


    /**
     * timed offer times out if full and elements not taken
     */

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    public void testClear() {
        BlockingQueue q = populatedQueue(SIZE);
        q.clear();
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        assertEquals(SIZE, q.remainingCapacity());
        q.add(one);
        assertFalse(q.isEmpty());
        assertTrue(q.contains(one));
        q.clear();
        assertTrue(q.isEmpty());

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                assertFalse(Thread.interrupted());
            }
        });


        await(pleaseTake);
        assertEquals(0, q.remainingCapacity());
        assertEquals(0, q.take());


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

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        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
        assertEquals(0, q.remainingCapacity());
    }


    /**
     * timed offer times out if full and elements not taken
     */

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        BlockingQueue q = new LocalConcurrentBlockingObjectQueue(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;
    }


    /**

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