Package org.apache.curator.framework

Examples of org.apache.curator.framework.CuratorFramework

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    {
        final int SLEEP = 1000;
        final int TIMES = 5;

        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryNTimes(TIMES, SLEEP));
        try
        {
            client.start();
            client.getZookeeperClient().blockUntilConnectedOrTimedOut();

            final CountDownLatch latch = new CountDownLatch(TIMES);
            final List<Long> times = Lists.newArrayList();
            final AtomicLong start = new AtomicLong(System.currentTimeMillis());
            ((CuratorFrameworkImpl)client).debugListener = new CuratorFrameworkImpl.DebugBackgroundListener()
            {
                @Override
                public void listen(OperationAndData<?> data)
                {
                    if ( data.getOperation().getClass().getName().contains("CreateBuilderImpl") )
                    {
                        long now = System.currentTimeMillis();
                        times.add(now - start.get());
                        start.set(now);
                        latch.countDown();
                    }
                }
            };

            server.stop();
            client.create().inBackground().forPath("/one");

            latch.await();

            for ( long elapsed : times.subList(1, times.size()) )   // first one isn't a retry
            {
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    @Test
    public void testBasic() throws Exception
    {
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();

            final CountDownLatch latch = new CountDownLatch(3);
            final List<String> paths = Lists.newArrayList();
            BackgroundCallback callback = new BackgroundCallback()
            {
                @Override
                public void processResult(CuratorFramework client, CuratorEvent event) throws Exception
                {
                    paths.add(event.getPath());
                    latch.countDown();
                }
            };
            client.create().inBackground(callback).forPath("/one");
            client.create().inBackground(callback).forPath("/one/two");
            client.create().inBackground(callback).forPath("/one/two/three");

            latch.await();

            Assert.assertEquals(paths, Arrays.asList("/one", "/one/two", "/one/two/three"));
        }
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     */
    @Test
    public void testCuratorCallbackOnError() throws Exception
    {
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.builder().connectString(server.getConnectString()).sessionTimeoutMs(timing.session()).connectionTimeoutMs(timing.connection()).retryPolicy(new RetryOneTime(1000)).build();
        final CountDownLatch latch = new CountDownLatch(1);
        try
        {
            client.start();
            BackgroundCallback curatorCallback = new BackgroundCallback()
            {

                @Override
                public void processResult(CuratorFramework client, CuratorEvent event) throws Exception
                {
                    if ( event.getResultCode() == Code.CONNECTIONLOSS.intValue() )
                    {
                        latch.countDown();
                    }
                }
            };
            // Stop the Zookeeper server
            server.stop();
            // Attempt to retrieve children list
            client.getChildren().inBackground(curatorCallback).forPath("/");
            // Check if the callback has been called with a correct return code
            Assert.assertTrue(timing.awaitLatch(latch), "Callback has not been called by curator !");
        }
        finally
        {
            client.close();
        }

    }
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     */
    @Test
    public void testShutdown() throws Exception
    {
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory
            .builder()
            .connectString(server.getConnectString())
            .sessionTimeoutMs(timing.session())
            .connectionTimeoutMs(timing.connection()).retryPolicy(new RetryOneTime(1))
            .maxCloseWaitMs(timing.forWaiting().milliseconds())
            .build();
        try
        {
            final AtomicBoolean hadIllegalStateException = new AtomicBoolean(false);
            ((CuratorFrameworkImpl)client).debugUnhandledErrorListener = new UnhandledErrorListener()
            {
                @Override
                public void unhandledError(String message, Throwable e)
                {
                    if ( e instanceof IllegalStateException )
                    {
                        hadIllegalStateException.set(true);
                    }
                }
            };
            client.start();

            final CountDownLatch operationReadyLatch = new CountDownLatch(1);
            ((CuratorFrameworkImpl)client).debugListener = new CuratorFrameworkImpl.DebugBackgroundListener()
            {
                @Override
                public void listen(OperationAndData<?> data)
                {
                    try
                    {
                        operationReadyLatch.await();
                    }
                    catch ( InterruptedException e )
                    {
                        Thread.currentThread().interrupt();
                    }
                }
            };

            // queue a background operation that will block due to the debugListener
            client.create().inBackground().forPath("/hey");
            timing.sleepABit();

            // close the client while the background is still blocked
            client.close();

            // unblock the background
            operationReadyLatch.countDown();
            timing.sleepABit();

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

            client.create().forPath("/test-me");

            final CountDownLatch            latch = new CountDownLatch(1);
            final Semaphore                 semaphore = new Semaphore(0);
            ConnectionStateListener         listener = new ConnectionStateListener()
            {
                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                    if ( (newState == ConnectionState.LOST) || (newState == ConnectionState.SUSPENDED) )
                    {
                        semaphore.release();
                    }
                    else if ( newState == ConnectionState.RECONNECTED )
                    {
                        latch.countDown();
                    }
                }
            };
            client.getConnectionStateListenable().addListener(listener);
            server.stop();

            Assert.assertTrue(timing.acquireSemaphore(semaphore));
            try
            {
                client.delete().guaranteed().forPath("/test-me");
                Assert.fail();
            }
            catch ( KeeperException.ConnectionLossException e )
            {
                // expected
            }
            Assert.assertTrue(timing.acquireSemaphore(semaphore));

            timing.sleepABit();

            server.restart();
            Assert.assertTrue(timing.awaitLatch(latch));

            timing.sleepABit();

            Assert.assertNull(client.checkExists().forPath("/test-me"));
        }
        finally
        {
            CloseableUtils.closeQuietly(client);
        }
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    @Test
    public void     testWithNamespaceAndLostSession() throws Exception
    {
        Timing                  timing = new Timing();
        CuratorFramework        client = CuratorFrameworkFactory.builder().connectString(server.getConnectString())
            .sessionTimeoutMs(timing.session())
            .connectionTimeoutMs(timing.connection())
            .retryPolicy(new ExponentialBackoffRetry(100, 3))
            .namespace("aisa")
            .build();
        try
        {
            client.start();

            client.create().forPath("/test-me");

            final CountDownLatch            latch = new CountDownLatch(1);
            final Semaphore                 semaphore = new Semaphore(0);
            ConnectionStateListener         listener = new ConnectionStateListener()
            {
                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                    if ( (newState == ConnectionState.LOST) || (newState == ConnectionState.SUSPENDED) )
                    {
                        semaphore.release();
                    }
                    else if ( newState == ConnectionState.RECONNECTED )
                    {
                        latch.countDown();
                    }
                }
            };
            client.getConnectionStateListenable().addListener(listener);
            server.stop();

            Assert.assertTrue(timing.acquireSemaphore(semaphore));
            try
            {
                client.delete().guaranteed().forPath("/test-me");
                Assert.fail();
            }
            catch ( KeeperException.ConnectionLossException e )
            {
                // expected
            }
            Assert.assertTrue(timing.acquireSemaphore(semaphore));

            timing.sleepABit();

            server.restart();
            Assert.assertTrue(timing.awaitLatch(latch));

            timing.sleepABit();

            Assert.assertNull(client.checkExists().forPath("/test-me"));
        }
        finally
        {
            CloseableUtils.closeQuietly(client);
        }
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    @Test
    public void     testWithNamespaceAndLostSessionAlt() throws Exception
    {
        Timing                  timing = new Timing();
        CuratorFramework        client = CuratorFrameworkFactory.builder().connectString(server.getConnectString())
            .sessionTimeoutMs(timing.session())
            .connectionTimeoutMs(timing.connection())
            .retryPolicy(new ExponentialBackoffRetry(100, 3))
            .build();
        try
        {
            client.start();

            CuratorFramework        namespaceClient = client.usingNamespace("foo");
            namespaceClient.create().forPath("/test-me");

            final CountDownLatch            latch = new CountDownLatch(1);
            final Semaphore                 semaphore = new Semaphore(0);
            ConnectionStateListener         listener = new ConnectionStateListener()
            {
                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState)
                {
                    if ( (newState == ConnectionState.LOST) || (newState == ConnectionState.SUSPENDED) )
                    {
                        semaphore.release();
                    }
                    else if ( newState == ConnectionState.RECONNECTED )
                    {
                        latch.countDown();
                    }
                }
            };
            namespaceClient.getConnectionStateListenable().addListener(listener);
            server.stop();

            Assert.assertTrue(timing.acquireSemaphore(semaphore));
            try
            {
                namespaceClient.delete().guaranteed().forPath("/test-me");
                Assert.fail();
            }
            catch ( KeeperException.ConnectionLossException e )
            {
                // expected
            }
            Assert.assertTrue(timing.acquireSemaphore(semaphore));

            timing.sleepABit();

            server.restart();
            Assert.assertTrue(timing.awaitLatch(latch));

            timing.sleepABit();

            Assert.assertNull(namespaceClient.checkExists().forPath("/test-me"));
        }
        finally
        {
            CloseableUtils.closeQuietly(client);
        }
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    }
   
    @Test
    public void testGuaranteedDeleteOnNonExistentNodeInForeground() throws Exception
    {
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
       
        final AtomicBoolean pathAdded = new AtomicBoolean(false);
       
        ((CuratorFrameworkImpl)client).getFailedDeleteManager().debugListener = new FailedDeleteManagerListener()
        {
           
            @Override
            public void pathAddedForDelete(String path)
            {
                pathAdded.set(true);
            }
        };
       
        try
        {
            client.delete().guaranteed().forPath("/nonexistent");
            Assert.fail();
        }
        catch(NoNodeException e)
        {
            //Exception is expected, the delete should not be retried
            Assert.assertFalse(pathAdded.get());
        }
        finally
        {
            client.close();
        }       
    }
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    }
   
    @Test
    public void testGuaranteedDeleteOnNonExistentNodeInBackground() throws Exception
    {
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
       
        final AtomicBoolean pathAdded = new AtomicBoolean(false);
       
        ((CuratorFrameworkImpl)client).getFailedDeleteManager().debugListener = new FailedDeleteManagerListener()
        {
           
            @Override
            public void pathAddedForDelete(String path)
            {
                pathAdded.set(true);
            }
        };
       
        final CountDownLatch backgroundLatch = new CountDownLatch(1);
       
        BackgroundCallback background = new BackgroundCallback()
        {
           
            @Override
            public void processResult(CuratorFramework client, CuratorEvent event)
                    throws Exception
            {
                backgroundLatch.countDown();
            }
        };
       
        try
        {
            client.delete().guaranteed().inBackground(background).forPath("/nonexistent");
           
            backgroundLatch.await();
           
            //Exception is expected, the delete should not be retried
            Assert.assertFalse(pathAdded.get());
        }
        finally
        {
            client.close();
        }       
    }   
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    public void     testBackgroundGetDataWithWatch() throws Exception
    {
        final byte[]        data1 = {1, 2, 3};
        final byte[]        data2 = {4, 5, 6, 7};

        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
        try
        {
            final CountDownLatch          watchedLatch = new CountDownLatch(1);
            client.getCuratorListenable().addListener
            (
                new CuratorListener()
                {
                    @Override
                    public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception
                    {
                        if ( event.getType() == CuratorEventType.GET_DATA )
                        {
                            Assert.assertEquals(event.getPath(), "/test");
                            Assert.assertEquals(event.getData(), data1);
                            ((CountDownLatch)event.getContext()).countDown();
                        }
                        else if ( event.getType() == CuratorEventType.WATCHED )
                        {
                            if ( event.getWatchedEvent().getType() == Watcher.Event.EventType.NodeDataChanged )
                            {
                                Assert.assertEquals(event.getPath(), "/test");
                                watchedLatch.countDown();
                            }
                        }
                    }
                }
            );

            client.create().forPath("/test", data1);

            CountDownLatch      backgroundLatch = new CountDownLatch(1);
            client.getData().watched().inBackground(backgroundLatch).forPath("/test");
            Assert.assertTrue(backgroundLatch.await(10, TimeUnit.SECONDS));

            client.setData().forPath("/test", data2);
            Assert.assertTrue(watchedLatch.await(10, TimeUnit.SECONDS));
            byte[]      checkData = client.getData().forPath("/test");
            Assert.assertEquals(checkData, data2);
        }
        finally
        {
            client.close();
        }
    }
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