Examples with ZKSessionLock com.twitter.distributedlog.lock.ZKSessionLock used on opensource projects

Example 6 with ZKSessionLock

use of com.twitter.distributedlog.lock.ZKSessionLock in project distributedlog by twitter.

the class TestZKSessionLock method testLockListenerOnExpired.

/**
     * Test session expired after claimed the lock: lock state should be changed to expired and notify
     * the lock listener about expiry.
     *
     * @throws Exception
     */
@Test(timeout = 60000)
public void testLockListenerOnExpired() throws Exception {
    String lockPath = "/test-lock-listener-on-expired";
    String clientId = "test-lock-listener-on-expired-" + System.currentTimeMillis();
    createLockPath(zkc.get(), lockPath);
    final CountDownLatch expiredLatch = new CountDownLatch(1);
    LockListener listener = new LockListener() {

        @Override
        public void onExpired() {
            expiredLatch.countDown();
        }
    };
    final ZKSessionLock lock = new ZKSessionLock(zkc, lockPath, clientId, lockStateExecutor).setLockListener(listener);
    lock.tryLock(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
    // verification after lock
    assertEquals(State.CLAIMED, lock.getLockState());
    List<String> children = getLockWaiters(zkc, lockPath);
    assertEquals(1, children.size());
    assertEquals(lock.getLockId(), Await.result(asyncParseClientID(zkc.get(), lockPath, children.get(0))));
    ZooKeeperClientUtils.expireSession(zkc, zkServers, sessionTimeoutMs);
    expiredLatch.await();
    assertEquals(State.EXPIRED, lock.getLockState());
    children = getLockWaiters(zkc, lockPath);
    assertEquals(0, children.size());
    try {
        lock.tryLock(0, TimeUnit.MILLISECONDS);
        fail("Should fail on tryLock since lock state has changed.");
    } catch (LockStateChangedException lsce) {
    // expected
    }
    lock.unlock();
}

Example 7 with ZKSessionLock

use of com.twitter.distributedlog.lock.ZKSessionLock in project distributedlog by twitter.

the class TestZKSessionLock method testLockOnNonExistedLock.

/**
     * Test lock on non existed lock.
     *
     * - lock should fail on a non existed lock.
     *
     * @throws Exception
     */
@Test(timeout = 60000)
public void testLockOnNonExistedLock() throws Exception {
    String lockPath = "/test-lock-on-non-existed-lock";
    String clientId = "test-lock-on-non-existed-lock";
    ZKSessionLock lock = new ZKSessionLock(zkc, lockPath, clientId, lockStateExecutor);
    // lock
    try {
        lock.tryLock(0, TimeUnit.MILLISECONDS);
        fail("Should fail on locking a non-existed lock.");
    } catch (LockingException le) {
        Throwable cause = le.getCause();
        assertTrue(cause instanceof KeeperException);
        assertEquals(KeeperException.Code.NONODE, ((KeeperException) cause).code());
    }
    assertEquals(State.CLOSED, lock.getLockState());
    // lock should failed on a failure lock
    try {
        lock.tryLock(0, TimeUnit.MILLISECONDS);
        fail("Should fail on locking a failure lock.");
    } catch (LockStateChangedException lsce) {
    // expected
    }
    assertEquals(State.CLOSED, lock.getLockState());
}

Example 8 with ZKSessionLock

use of com.twitter.distributedlog.lock.ZKSessionLock in project distributedlog by twitter.

the class TestZKSessionLock method testUnlockTimeout.

/**
     * Test unlock timeout.
     *
     * @throws Exception
     */
@Test(timeout = 60000)
public void testUnlockTimeout() throws Exception {
    String name = testNames.getMethodName();
    String lockPath = "/" + name;
    String clientId = name;
    createLockPath(zkc.get(), lockPath);
    ZKSessionLock lock = new ZKSessionLock(zkc, lockPath, clientId, lockStateExecutor, 1 * 1000, /* op timeout */
    NullStatsLogger.INSTANCE, new DistributedLockContext());
    lock.tryLock(0, TimeUnit.MILLISECONDS);
    assertEquals(State.CLAIMED, lock.getLockState());
    try {
        FailpointUtils.setFailpoint(FailpointUtils.FailPointName.FP_LockUnlockCleanup, new DelayFailpointAction(60 * 60 * 1000));
        lock.unlock();
        assertEquals(State.CLOSING, lock.getLockState());
    } finally {
        FailpointUtils.removeFailpoint(FailpointUtils.FailPointName.FP_LockUnlockCleanup);
    }
}

Example 9 with ZKSessionLock

use of com.twitter.distributedlog.lock.ZKSessionLock in project distributedlog by twitter.

the class TestZKSessionLock method testExecuteLockAction.

@Test(timeout = 60000)
public void testExecuteLockAction() throws Exception {
    String lockPath = "/test-execute-lock-action";
    String clientId = "test-execute-lock-action-" + System.currentTimeMillis();
    ZKSessionLock lock = new ZKSessionLock(zkc, lockPath, clientId, lockStateExecutor);
    final AtomicInteger counter = new AtomicInteger(0);
    // lock action would be executed in same epoch
    final CountDownLatch latch1 = new CountDownLatch(1);
    lock.executeLockAction(lock.getEpoch().get(), new LockAction() {

        @Override
        public void execute() {
            counter.incrementAndGet();
            latch1.countDown();
        }

        @Override
        public String getActionName() {
            return "increment1";
        }
    });
    latch1.await();
    assertEquals("counter should be increased in same epoch", 1, counter.get());
    // lock action would not be executed in same epoch
    final CountDownLatch latch2 = new CountDownLatch(1);
    lock.executeLockAction(lock.getEpoch().get() + 1, new LockAction() {

        @Override
        public void execute() {
            counter.incrementAndGet();
        }

        @Override
        public String getActionName() {
            return "increment2";
        }
    });
    lock.executeLockAction(lock.getEpoch().get(), new LockAction() {

        @Override
        public void execute() {
            latch2.countDown();
        }

        @Override
        public String getActionName() {
            return "countdown";
        }
    });
    latch2.await();
    assertEquals("counter should not be increased in different epochs", 1, counter.get());
    // lock action would not be executed in same epoch and promise would be satisfied with exception
    Promise<BoxedUnit> promise = new Promise<BoxedUnit>();
    lock.executeLockAction(lock.getEpoch().get() + 1, new LockAction() {

        @Override
        public void execute() {
            counter.incrementAndGet();
        }

        @Override
        public String getActionName() {
            return "increment3";
        }
    }, promise);
    try {
        Await.result(promise);
        fail("Should satisfy promise with epoch changed exception.");
    } catch (EpochChangedException ece) {
    // expected
    }
    assertEquals("counter should not be increased in different epochs", 1, counter.get());
    lockStateExecutor.shutdown();
}

Example 10 with ZKSessionLock

use of com.twitter.distributedlog.lock.ZKSessionLock in project distributedlog by twitter.

the class TestZKSessionLock method testTryCloseRaceCondition.

/**
     * Test try-create after close race condition.
     *
     * @throws Exception
     */
@Test(timeout = 60000)
public void testTryCloseRaceCondition() throws Exception {
    String name = testNames.getMethodName();
    String lockPath = "/" + name;
    String clientId = name;
    createLockPath(zkc.get(), lockPath);
    ZKSessionLock lock = new ZKSessionLock(zkc, lockPath, clientId, lockStateExecutor, 1 * 1000, /* op timeout */
    NullStatsLogger.INSTANCE, new DistributedLockContext());
    try {
        FailpointUtils.setFailpoint(FailpointUtils.FailPointName.FP_LockTryCloseRaceCondition, FailpointUtils.DEFAULT_ACTION);
        lock.tryLock(0, TimeUnit.MILLISECONDS);
    } catch (LockClosedException ex) {
        ;
    } finally {
        FailpointUtils.removeFailpoint(FailpointUtils.FailPointName.FP_LockTryCloseRaceCondition);
    }
    assertEquals(State.CLOSED, lock.getLockState());
    List<String> children = getLockWaiters(zkc, lockPath);
    assertEquals(0, children.size());
}