Package org.apache.curator.test

Examples of org.apache.curator.test.Timing

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    @Test
    public void testInterruptLeadership() throws Exception
    {
        LeaderSelector selector = null;
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();

            final CountDownLatch isLeaderLatch = new CountDownLatch(1);
            final CountDownLatch losingLeaderLatch = new CountDownLatch(1);
            LeaderSelectorListener listener = new LeaderSelectorListener()
            {
                @Override
                public void takeLeadership(CuratorFramework client) throws Exception
                {
                    isLeaderLatch.countDown();
                    try
                    {
                        Thread.currentThread().join();
                    }
                    finally
                    {
                        losingLeaderLatch.countDown();
                    }
                }

                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                }
            };

            selector = new LeaderSelector(client, "/leader", listener);
            selector.start();

            Assert.assertTrue(timing.awaitLatch(isLeaderLatch));
            selector.interruptLeadership();
            Assert.assertTrue(timing.awaitLatch(losingLeaderLatch));
        }
        finally
        {
            CloseableUtils.closeQuietly(selector);
            CloseableUtils.closeQuietly(client);
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    @Test
    public void testRaceAtStateChanged() throws Exception
    {
        LeaderSelector selector = null;
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();

            final CountDownLatch takeLeadershipLatch = new CountDownLatch(1);
            final CountDownLatch lostLatch = new CountDownLatch(1);
            final CountDownLatch reconnectedLatch = new CountDownLatch(1);
            LeaderSelectorListener listener = new LeaderSelectorListener()
            {
                @Override
                public void takeLeadership(CuratorFramework client) throws Exception
                {
                    takeLeadershipLatch.countDown();  // should never get here
                }

                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                    if ( newState == ConnectionState.RECONNECTED )
                    {
                        reconnectedLatch.countDown();
                    }
                    else if ( newState == ConnectionState.LOST )
                    {
                        lostLatch.countDown();
                        throw new CancelLeadershipException();
                    }
                }
            };

            selector = new LeaderSelector(client, "/leader", listener);
            CountDownLatch debugLeadershipLatch = new CountDownLatch(1);
            CountDownLatch debugLeadershipWaitLatch = new CountDownLatch(1);
            selector.debugLeadershipLatch = debugLeadershipLatch;
            selector.debugLeadershipWaitLatch = debugLeadershipWaitLatch;

            selector.start();

            Assert.assertTrue(timing.awaitLatch(debugLeadershipLatch));
            server.stop();
            Assert.assertTrue(timing.awaitLatch(lostLatch));
            timing.sleepABit();
            debugLeadershipWaitLatch.countDown();

            server = new TestingServer(server.getPort(), server.getTempDirectory());
            Assert.assertTrue(timing.awaitLatch(reconnectedLatch));

            Assert.assertFalse(takeLeadershipLatch.await(3, TimeUnit.SECONDS));
        }
        finally
        {
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    }

    @Test
    public void testAutoRequeue() throws Exception
    {
        Timing timing = new Timing();
        LeaderSelector selector = null;
        CuratorFramework client = CuratorFrameworkFactory.builder().connectString(server.getConnectString()).retryPolicy(new RetryOneTime(1)).sessionTimeoutMs(timing.session()).build();
        try
        {
            client.start();

            final Semaphore semaphore = new Semaphore(0);
            LeaderSelectorListener listener = new LeaderSelectorListener()
            {
                @Override
                public void takeLeadership(CuratorFramework client) throws Exception
                {
                    Thread.sleep(10);
                    semaphore.release();
                }

                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                }
            };
            selector = new LeaderSelector(client, "/leader", listener);
            selector.autoRequeue();
            selector.start();

            Assert.assertTrue(timing.acquireSemaphore(semaphore, 2));
        }
        finally
        {
            CloseableUtils.closeQuietly(selector);
            CloseableUtils.closeQuietly(client);
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    }

    @Test
    public void testServerDying() throws Exception
    {
        Timing timing = new Timing();
        LeaderSelector selector = null;
        CuratorFramework client = CuratorFrameworkFactory.builder().connectionTimeoutMs(timing.connection()).connectString(server.getConnectString()).retryPolicy(new RetryOneTime(1)).sessionTimeoutMs(timing.session()).build();
        client.start();
        try
        {
            final Semaphore semaphore = new Semaphore(0);
            LeaderSelectorListener listener = new LeaderSelectorListener()
            {
                @Override
                public void takeLeadership(CuratorFramework client) throws Exception
                {
                    semaphore.release();
                    Thread.sleep(Integer.MAX_VALUE);
                }

                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                    if ( newState == ConnectionState.LOST )
                    {
                        semaphore.release();
                    }
                }
            };
            selector = new LeaderSelector(client, "/leader", listener);
            selector.start();

            timing.acquireSemaphore(semaphore);

            server.close();

            timing.acquireSemaphore(semaphore);
        }
        finally
        {
            CloseableUtils.closeQuietly(selector);
            CloseableUtils.closeQuietly(client);
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    protected abstract InterProcessLock makeLock(CuratorFramework client);

    @Test
    public void testWaitingProcessKilledServer() throws Exception
    {
        final Timing timing = new Timing();
        final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new ExponentialBackoffRetry(100, 3));
        try
        {
            client.start();

            final CountDownLatch latch = new CountDownLatch(1);
            ConnectionStateListener listener = new ConnectionStateListener()
            {
                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                    if ( newState == ConnectionState.LOST )
                    {
                        latch.countDown();
                    }
                }
            };
            client.getConnectionStateListenable().addListener(listener);

            final AtomicBoolean isFirst = new AtomicBoolean(true);
            ExecutorCompletionService<Object> service = new ExecutorCompletionService<Object>(Executors.newFixedThreadPool(2));
            for ( int i = 0; i < 2; ++i )
            {
                service.submit
                (
                    new Callable<Object>()
                    {
                        @Override
                        public Object call() throws Exception
                        {
                            InterProcessLock lock = makeLock(client);
                            lock.acquire();
                            try
                            {
                                if ( isFirst.compareAndSet(true, false) )
                                {
                                    timing.sleepABit();

                                    server.stop();
                                    Assert.assertTrue(timing.awaitLatch(latch));
                                    server = new TestingServer(server.getPort(), server.getTempDirectory());
                                }
                            }
                            finally
                            {
                                try
                                {
                                    lock.release();
                                }
                                catch ( Exception e )
                                {
                                    // ignore
                                }
                            }
                            return null;
                        }
                    }
                );
            }

            for ( int i = 0; i < 2; ++i )
            {
                service.take().get(timing.forWaiting().milliseconds(), TimeUnit.MILLISECONDS);
            }
        }
        finally
        {
            CloseableUtils.closeQuietly(client);
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    }

    @Test
    public void testKilledSession() throws Exception
    {
        final Timing timing = new Timing();

        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new ExponentialBackoffRetry(100, 3));
        client.start();
        try
        {
            final InterProcessLock mutex1 = makeLock(client);
            final InterProcessLock mutex2 = makeLock(client);

            final Semaphore semaphore = new Semaphore(0);
            ExecutorCompletionService<Object> service = new ExecutorCompletionService<Object>(Executors.newFixedThreadPool(2));
            service.submit
                (
                    new Callable<Object>()
                    {
                        @Override
                        public Object call() throws Exception
                        {
                            mutex1.acquire();
                            semaphore.release();
                            Thread.sleep(1000000);
                            return null;
                        }
                    }
                );

            service.submit
                (
                    new Callable<Object>()
                    {
                        @Override
                        public Object call() throws Exception
                        {
                            mutex2.acquire();
                            semaphore.release();
                            Thread.sleep(1000000);
                            return null;
                        }
                    }
                );

            Assert.assertTrue(timing.acquireSemaphore(semaphore, 1));
            KillSession.kill(client.getZookeeperClient().getZooKeeper(), server.getConnectString());
            Assert.assertTrue(timing.acquireSemaphore(semaphore, 1));
        }
        finally
        {
            client.close();
        }
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    private static final int MAX_LOOPS = 5;

    @Test
    public void testResetRace() throws Exception
    {
        Timing timing = new Timing();
        LeaderLatch latch = null;
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();
            latch = new LeaderLatch(client, PATH_NAME);

            latch.debugResetWaitLatch = new CountDownLatch(1);
            latch.start();  // will call reset()
            latch.reset();  // should not result in two nodes

            timing.sleepABit();

            latch.debugResetWaitLatch.countDown();

            timing.sleepABit();

            Assert.assertEquals(client.getChildren().forPath(PATH_NAME).size(), 1);
        }
        finally
        {
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    }

    @Test
    public void testCreateDeleteRace() throws Exception
    {
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();
            LeaderLatch latch = new LeaderLatch(client, PATH_NAME);

            latch.debugResetWaitLatch = new CountDownLatch(1);

            latch.start();
            latch.close();

            timing.sleepABit();

            latch.debugResetWaitLatch.countDown();

            timing.sleepABit();

            Assert.assertEquals(client.getChildren().forPath(PATH_NAME).size(), 0);

        }
        finally
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    {
        final int PARTICIPANT_QTY = 10;

        List<LeaderLatch> latches = Lists.newArrayList();

        final Timing timing = new Timing();
        final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();

            final CountDownLatch countDownLatch = new CountDownLatch(1);
            client.getConnectionStateListenable().addListener(new ConnectionStateListener()
            {
                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                    if ( newState == ConnectionState.LOST )
                    {
                        countDownLatch.countDown();
                    }
                }
            });

            for ( int i = 0; i < PARTICIPANT_QTY; ++i )
            {
                LeaderLatch latch = new LeaderLatch(client, PATH_NAME);
                latch.start();
                latches.add(latch);
            }

            waitForALeader(latches, timing);

            server.stop();
            Assert.assertTrue(timing.awaitLatch(countDownLatch));

            timing.forWaiting().sleepABit();

            Assert.assertEquals(getLeaders(latches).size(), 0);

            server = new TestingServer(server.getPort(), server.getTempDirectory());
            Assert.assertEquals(waitForALeader(latches, timing).size(), 1); // should reconnect
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        final int PARTICIPANT_QTY = 10;
        final int PARTICIPANT_ID = 2;

        List<LeaderLatch> latches = Lists.newArrayList();

        final Timing timing = new Timing();
        final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();

            for ( int i = 0; i < PARTICIPANT_QTY; ++i )
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