Examples of org.menagerie.latches.spi.ZkSemaphore.acquire()

Class org.menagerie.latches.spi.ZkSemaphore

Examples of org.menagerie.latches.spi.ZkSemaphore.acquire()

org.menagerie.latches.spi.ZkSemaphore.acquire()
Acquires a permit from this semaphore, blocking until one is available or this thread is interrupted.
If a permit is immediately available, this method returns immediately, reducing the number of available permits in the semaphore by one.
If no permit is available, then the current thread becomes disabled and lies dormant until one of the following occurs:
- Some other party invokes the {@link #release()} method for this semaphore and the current partyis the next to be assigned a permit
- Some other party leaves the Semaphore abruptly, as in a node failure scenario.
- Some other thread interrupts the current thread
If the current thread:
- has its interrupted status set on entry to this method or
- is interrupted while waiting for a permit
then an InterruptedException is thrown and the current thread's interrupted status is cleared. @throws InterruptedException if the current thread is interrupted

    @Test(timeout = 1000l)
    public void testAcquireSucceedsOneThread() throws Exception{
        int numPermits = 1;
        DistributedSemaphore semaphore = new ZkSemaphore(numPermits, basePath,zkSessionManager);


        semaphore.acquire();


        //check that the available permits are zero
        assertEquals("semaphore does not report fewer permits!",numPermits-1,semaphore.availablePermits());
        semaphore.release();
        assertEquals("semaphore does not report releasing a permit!",numPermits,semaphore.availablePermits());

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        testService.submit(new Runnable() {
            @Override
            public void run() {
                try {
                    semaphore.acquire();
                    latch.countDown();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }

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                    throw new RuntimeException(e);
                }
            }
        });


        semaphore.acquire();
        latch.await();
    }


    @Test(timeout = 1000l)
    public void testTwoClientsCanAccessSempahore() throws Exception{

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    @Test(timeout = 1000l)
    public void testTwoClientsCanAccessSempahore() throws Exception{
        final CountDownLatch latch = new CountDownLatch(1);
        final DistributedSemaphore semaphore = new ZkSemaphore(2,basePath,zkSessionManager);


        semaphore.acquire();
        Future<Void> errorFuture = testService.submit(new Callable<Void>() {
            @Override
            public Void call() throws Exception {
                ZooKeeper zk = newZooKeeper();
                try {

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            public Void call() throws Exception {
                ZooKeeper zk = newZooKeeper();
                try {


                    DistributedSemaphore semaphore2 = new ZkSemaphore(2, basePath, new BaseZkSessionManager(zk));
                    semaphore2.acquire();
                    latch.countDown();
                } finally {
                    zk.close();
                }
                return null;

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    @Test(timeout = 1500l)
    public void testRunOutOfPermitsTwoThreads() throws Exception{
        final CountDownLatch latch = new CountDownLatch(1);
        final DistributedSemaphore semaphore = new ZkSemaphore(1,basePath,zkSessionManager);
        semaphore.acquire();
        Future<?> errorFuture = testService.submit(new Runnable() {
            @Override
            public void run() {
                try {
                    semaphore.acquire();

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        semaphore.acquire();
        Future<?> errorFuture = testService.submit(new Runnable() {
            @Override
            public void run() {
                try {
                    semaphore.acquire();
                    latch.countDown();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }

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    @Test(timeout = 1500l)
    public void testRunOutOfPermitsTwoClients() throws Exception{
        final CountDownLatch latch = new CountDownLatch(1);
        final DistributedSemaphore semaphore = new ZkSemaphore(1,basePath,zkSessionManager);
        semaphore.acquire();
        Future<Void> errorFuture = testService.submit(new Callable<Void>() {
            @Override
            public Void call() throws Exception {
                ZooKeeper zk = newZooKeeper();
                try {

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            @Override
            public Void call() throws Exception {
                ZooKeeper zk = newZooKeeper();
                try {
                    DistributedSemaphore semaphore2 = new ZkSemaphore(1, basePath, new BaseZkSessionManager(zk));
                    semaphore2.acquire();
                    latch.countDown();
                } finally {
                    zk.close();
                }
                return null;

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    @Test(timeout = 1000l)
    public void testAcquireMultiplePermits() throws Exception{
        DistributedSemaphore semaphore = new ZkSemaphore(2,basePath,zkSessionManager);


        semaphore.acquire(2);
        assertEquals("Incorrect number of permits reported!",0,semaphore.availablePermits());


        semaphore.release();
        assertEquals("Incorrect number of permits reported",1,semaphore.availablePermits());

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