| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.curator.framework.recipes.shared; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.util.concurrent.ThreadFactoryBuilder; |
| import org.apache.curator.framework.CuratorFramework; |
| import org.apache.curator.framework.CuratorFrameworkFactory; |
| import org.apache.curator.framework.api.BackgroundCallback; |
| import org.apache.curator.framework.api.CuratorEvent; |
| import org.apache.curator.framework.api.CuratorWatcher; |
| import org.apache.curator.framework.state.ConnectionState; |
| import org.apache.curator.framework.state.ConnectionStateListener; |
| import org.apache.curator.retry.RetryNTimes; |
| import org.apache.curator.retry.RetryOneTime; |
| import org.apache.curator.test.Timing; |
| import org.apache.curator.test.compatibility.CuratorTestBase; |
| import org.apache.curator.utils.CloseableUtils; |
| import org.apache.zookeeper.WatchedEvent; |
| import org.testng.Assert; |
| import org.testng.annotations.Test; |
| import java.util.List; |
| import java.util.Random; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.Phaser; |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| public class TestSharedCount extends CuratorTestBase |
| { |
| @Test |
| public void testMultiClients() throws Exception |
| { |
| final int CLIENT_QTY = 5; |
| |
| List<Future<List<Integer>>> futures = Lists.newArrayList(); |
| final List<CuratorFramework> clients = new CopyOnWriteArrayList<CuratorFramework>(); |
| final List<SharedCount> counts = new CopyOnWriteArrayList<SharedCount>(); |
| try |
| { |
| final CountDownLatch startLatch = new CountDownLatch(CLIENT_QTY); |
| final Semaphore semaphore = new Semaphore(0); |
| ExecutorService service = Executors.newCachedThreadPool(new ThreadFactoryBuilder().setNameFormat("Test-%d").build()); |
| for ( int i = 0; i < CLIENT_QTY; ++i ) |
| { |
| Future<List<Integer>> future = service.submit |
| ( |
| new Callable<List<Integer>>() |
| { |
| @Override |
| public List<Integer> call() throws Exception |
| { |
| final List<Integer> countList = Lists.newArrayList(); |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| clients.add(client); |
| client.start(); |
| client.checkExists().forPath("/"); // clear initial connect event |
| |
| SharedCount count = new SharedCount(client, "/count", 10); |
| counts.add(count); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| count.addListener |
| ( |
| new SharedCountListener() |
| { |
| @Override |
| public void countHasChanged(SharedCountReader sharedCount, int newCount) throws Exception |
| { |
| if ( newCount < 0 ) |
| { |
| latch.countDown(); |
| } |
| else |
| { |
| countList.add(newCount); |
| } |
| |
| semaphore.release(); |
| } |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| } |
| } |
| ); |
| count.start(); |
| startLatch.countDown(); |
| latch.await(); |
| return countList; |
| } |
| } |
| ); |
| futures.add(future); |
| } |
| |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| clients.add(client); |
| client.start(); |
| client.checkExists().forPath("/"); // clear initial connect event |
| |
| Assert.assertTrue(startLatch.await(10, TimeUnit.SECONDS)); |
| |
| SharedCount count = new SharedCount(client, "/count", 10); |
| counts.add(count); |
| count.start(); |
| |
| List<Integer> countList = Lists.newArrayList(); |
| Random random = new Random(); |
| for ( int i = 0; i < 100; ++i ) |
| { |
| Thread.sleep(random.nextInt(10)); |
| |
| int next = random.nextInt(100); |
| countList.add(next); |
| count.setCount(next); |
| |
| Assert.assertTrue(semaphore.tryAcquire(CLIENT_QTY, 10, TimeUnit.SECONDS)); |
| } |
| count.setCount(-1); |
| |
| for ( Future<List<Integer>> future : futures ) |
| { |
| List<Integer> thisCountList = future.get(); |
| Assert.assertEquals(thisCountList, countList); |
| } |
| } |
| finally |
| { |
| for ( SharedCount count : counts ) |
| { |
| CloseableUtils.closeQuietly(count); |
| } |
| for ( CuratorFramework client : clients ) |
| { |
| CloseableUtils.closeQuietly(client); |
| } |
| } |
| } |
| |
| @Test |
| public void testSimple() throws Exception |
| { |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| SharedCount count = new SharedCount(client, "/count", 0); |
| try |
| { |
| client.start(); |
| count.start(); |
| |
| final CountDownLatch setLatch = new CountDownLatch(3); |
| SharedCountListener listener = new SharedCountListener() |
| { |
| @Override |
| public void countHasChanged(SharedCountReader sharedCount, int newCount) throws Exception |
| { |
| setLatch.countDown(); |
| } |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| // nop |
| } |
| }; |
| count.addListener(listener); |
| |
| Assert.assertTrue(count.trySetCount(1)); |
| timing.sleepABit(); |
| Assert.assertTrue(count.trySetCount(2)); |
| timing.sleepABit(); |
| Assert.assertTrue(count.trySetCount(10)); |
| timing.sleepABit(); |
| Assert.assertEquals(count.getCount(), 10); |
| |
| Assert.assertTrue(new Timing().awaitLatch(setLatch)); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(count); |
| CloseableUtils.closeQuietly(client); |
| } |
| } |
| |
| @Test |
| public void testSimpleVersioned() throws Exception |
| { |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| SharedCount count = new SharedCount(client, "/count", 0); |
| client.start(); |
| try |
| { |
| count.start(); |
| |
| VersionedValue<Integer> current = count.getVersionedValue(); |
| Assert.assertEquals(current.getVersion(), 0); |
| |
| Assert.assertTrue(count.trySetCount(current, 1)); |
| current = count.getVersionedValue(); |
| Assert.assertEquals(current.getVersion(), 1); |
| Assert.assertEquals(count.getCount(), 1); |
| |
| Assert.assertTrue(count.trySetCount(current, 5)); |
| current = count.getVersionedValue(); |
| Assert.assertEquals(current.getVersion(), 2); |
| Assert.assertEquals(count.getCount(), 5); |
| |
| Assert.assertTrue(count.trySetCount(current, 10)); |
| |
| current = count.getVersionedValue(); |
| Assert.assertEquals(current.getVersion(), 3); |
| Assert.assertEquals(count.getCount(), 10); |
| |
| // Wrong value |
| Assert.assertFalse(count.trySetCount(new VersionedValue<Integer>(3, 20), 7)); |
| // Wrong version |
| Assert.assertFalse(count.trySetCount(new VersionedValue<Integer>(10, 10), 7)); |
| |
| // Server changed |
| client.setData().forPath("/count", SharedCount.toBytes(88)); |
| Assert.assertFalse(count.trySetCount(current, 234)); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(count); |
| CloseableUtils.closeQuietly(client); |
| } |
| } |
| |
| @Test |
| public void testMultiClientVersioned() throws Exception |
| { |
| Timing timing = new Timing(); |
| CuratorFramework client1 = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| CuratorFramework client2 = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| SharedCount count1 = new SharedCount(client1, "/count", 0); |
| SharedCount count2 = new SharedCount(client2, "/count", 0); |
| try |
| { |
| client1.start(); |
| client2.start(); |
| count1.start(); |
| count2.start(); |
| |
| VersionedValue<Integer> versionedValue = count1.getVersionedValue(); |
| Assert.assertTrue(count1.trySetCount(versionedValue, 10)); |
| timing.sleepABit(); |
| versionedValue = count2.getVersionedValue(); |
| Assert.assertTrue(count2.trySetCount(versionedValue, 20)); |
| timing.sleepABit(); |
| |
| final CountDownLatch setLatch = new CountDownLatch(2); |
| SharedCountListener listener = new SharedCountListener() |
| { |
| @Override |
| public void countHasChanged(SharedCountReader sharedCount, int newCount) throws Exception |
| { |
| setLatch.countDown(); |
| } |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| // nop |
| } |
| }; |
| count1.addListener(listener); |
| VersionedValue<Integer> versionedValue1 = count1.getVersionedValue(); |
| VersionedValue<Integer> versionedValue2 = count2.getVersionedValue(); |
| Assert.assertTrue(count2.trySetCount(versionedValue2, 30)); |
| Assert.assertFalse(count1.trySetCount(versionedValue1, 40)); |
| |
| versionedValue1 = count1.getVersionedValue(); |
| Assert.assertTrue(count1.trySetCount(versionedValue1, 40)); |
| Assert.assertTrue(timing.awaitLatch(setLatch)); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(count2); |
| CloseableUtils.closeQuietly(count1); |
| CloseableUtils.closeQuietly(client2); |
| CloseableUtils.closeQuietly(client1); |
| } |
| } |
| |
| |
| @Test |
| public void testMultiClientDifferentSeed() throws Exception |
| { |
| CuratorFramework client1 = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| CuratorFramework client2 = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| SharedCount count1 = new SharedCount(client1, "/count", 10); |
| SharedCount count2 = new SharedCount(client2, "/count", 20); |
| try |
| { |
| client1.start(); |
| client2.start(); |
| count1.start(); |
| count2.start(); |
| |
| Assert.assertEquals(count1.getCount(), 10); |
| Assert.assertEquals(count2.getCount(), 10); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(count2); |
| CloseableUtils.closeQuietly(count1); |
| CloseableUtils.closeQuietly(client2); |
| CloseableUtils.closeQuietly(client1); |
| } |
| } |
| |
| |
| @Test |
| public void testDisconnectEventOnWatcherDoesNotRetry() throws Exception |
| { |
| final CountDownLatch gotSuspendEvent = new CountDownLatch(1); |
| |
| CuratorFramework curatorFramework = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryNTimes(10, 1000)); |
| curatorFramework.start(); |
| curatorFramework.blockUntilConnected(); |
| |
| SharedCount sharedCount = new SharedCount(curatorFramework, "/count", 10); |
| sharedCount.start(); |
| |
| curatorFramework.getConnectionStateListenable().addListener(new ConnectionStateListener() { |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) { |
| if (newState == ConnectionState.SUSPENDED) { |
| gotSuspendEvent.countDown(); |
| } |
| } |
| }); |
| |
| try |
| { |
| server.stop(); |
| // if watcher goes into 10second retry loop we won't get timely notification |
| Assert.assertTrue(gotSuspendEvent.await(5, TimeUnit.SECONDS)); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(sharedCount); |
| CloseableUtils.closeQuietly(curatorFramework); |
| } |
| } |
| |
| @Test |
| public void testDisconnectReconnectEventDoesNotFireValueWatcher() throws Exception |
| { |
| final CountDownLatch gotSuspendEvent = new CountDownLatch(1); |
| final CountDownLatch gotChangeEvent = new CountDownLatch(1); |
| final CountDownLatch getReconnectEvent = new CountDownLatch(1); |
| |
| final AtomicInteger numChangeEvents = new AtomicInteger(0); |
| |
| CuratorFramework curatorFramework = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryNTimes(10, 500)); |
| curatorFramework.start(); |
| curatorFramework.blockUntilConnected(); |
| |
| SharedCount sharedCount = new SharedCount(curatorFramework, "/count", 10); |
| |
| sharedCount.addListener(new SharedCountListener() { |
| @Override |
| public void countHasChanged(SharedCountReader sharedCount, int newCount) throws Exception { |
| numChangeEvents.incrementAndGet(); |
| gotChangeEvent.countDown(); |
| } |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) { |
| if (newState == ConnectionState.SUSPENDED) { |
| gotSuspendEvent.countDown(); |
| } else if (newState == ConnectionState.RECONNECTED) { |
| getReconnectEvent.countDown(); |
| } |
| } |
| }); |
| sharedCount.start(); |
| |
| try |
| { |
| sharedCount.setCount(11); |
| Assert.assertTrue(gotChangeEvent.await(2, TimeUnit.SECONDS)); |
| |
| server.stop(); |
| Assert.assertTrue(gotSuspendEvent.await(2, TimeUnit.SECONDS)); |
| |
| server.restart(); |
| Assert.assertTrue(getReconnectEvent.await(2, TimeUnit.SECONDS)); |
| Assert.assertEquals(numChangeEvents.get(), 1); |
| |
| sharedCount.trySetCount(sharedCount.getVersionedValue(), 12); |
| |
| // flush background task queue |
| final CountDownLatch flushDone = new CountDownLatch(1); |
| curatorFramework.getData().inBackground(new BackgroundCallback() { |
| @Override |
| public void processResult(CuratorFramework client, CuratorEvent event) throws Exception { |
| flushDone.countDown(); |
| } |
| }).forPath("/count"); |
| flushDone.await(5, TimeUnit.SECONDS); |
| |
| // CURATOR-311: when a Curator client's state became RECONNECTED, countHasChanged method is called back |
| // because the Curator client calls readValueAndNotifyListenersInBackground in SharedValue#ConnectionStateListener#stateChanged. |
| Assert.assertTrue(numChangeEvents.get() > 2); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(sharedCount); |
| CloseableUtils.closeQuietly(curatorFramework); |
| } |
| } |
| |
| |
| @Test |
| public void testDisconnectReconnectWithMultipleClients() throws Exception |
| { |
| Timing timing = new Timing(); |
| CuratorFramework curatorFramework1 = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryNTimes(10, 500)); |
| CuratorFramework curatorFramework2 = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryNTimes(10, 500)); |
| |
| curatorFramework1.start(); |
| curatorFramework1.checkExists().forPath("/"); // clear initial connect events |
| curatorFramework2.start(); |
| curatorFramework2.checkExists().forPath("/"); // clear initial connect events |
| |
| final String sharedCountPath = "/count"; |
| final int initialCount = 10; |
| SharedCount sharedCount1 = new SharedCount(curatorFramework1, sharedCountPath, initialCount); |
| SharedCount sharedCountWithFaultyWatcher = createSharedCountWithFaultyWatcher(curatorFramework2, sharedCountPath, initialCount); |
| |
| class MySharedCountListener implements SharedCountListener |
| { |
| final public Phaser gotSuspendEvent = new Phaser(1); |
| final public Phaser gotChangeEvent = new Phaser(1); |
| final public Phaser getReconnectEvent = new Phaser(1); |
| final public AtomicInteger numChangeEvents = new AtomicInteger(0); |
| |
| @Override |
| public void countHasChanged(SharedCountReader sharedCount, int newCount) throws Exception |
| { |
| numChangeEvents.incrementAndGet(); |
| gotChangeEvent.arrive(); |
| } |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| if (newState == ConnectionState.SUSPENDED) { |
| gotSuspendEvent.arrive(); |
| } else if (newState == ConnectionState.RECONNECTED) { |
| getReconnectEvent.arrive(); |
| } |
| } |
| } |
| |
| MySharedCountListener listener1 = new MySharedCountListener(); |
| sharedCount1.addListener(listener1); |
| sharedCount1.start(); |
| MySharedCountListener listener2 = new MySharedCountListener(); |
| sharedCountWithFaultyWatcher.addListener(listener2); |
| |
| try |
| { |
| sharedCount1.setCount(12); |
| Assert.assertEquals(listener1.gotChangeEvent.awaitAdvanceInterruptibly(0, timing.seconds(), TimeUnit.SECONDS), 1); |
| Assert.assertEquals(sharedCount1.getCount(), 12); |
| |
| Assert.assertEquals(sharedCountWithFaultyWatcher.getCount(), 10); |
| // new counter with faultyWatcher start |
| sharedCountWithFaultyWatcher.start(); |
| |
| for (int i = 0; i < 10; i++) { |
| sharedCount1.setCount(13 + i); |
| Assert.assertEquals(sharedCount1.getCount(), 13 + i); |
| |
| server.restart(); |
| |
| Assert.assertEquals(listener2.getReconnectEvent.awaitAdvanceInterruptibly(i, timing.forWaiting().seconds(), TimeUnit.SECONDS), i + 1); |
| // CURATOR-311 introduces to Curator's client reading server's shared count value |
| // when client's state gets ConnectionState.RECONNECTED. Following tests ensures that. |
| Assert.assertEquals(listener2.gotChangeEvent.awaitAdvanceInterruptibly(i, timing.forWaiting().seconds(), TimeUnit.SECONDS), i + 1); |
| Assert.assertEquals(sharedCountWithFaultyWatcher.getCount(), 13 + i); |
| } |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(sharedCount1); |
| CloseableUtils.closeQuietly(curatorFramework1); |
| CloseableUtils.closeQuietly(sharedCountWithFaultyWatcher); |
| CloseableUtils.closeQuietly(curatorFramework2); |
| } |
| } |
| |
| private SharedCount createSharedCountWithFaultyWatcher(CuratorFramework curatorFramework, String path, int val) { |
| |
| final CuratorWatcher faultyWatcher = new CuratorWatcher() { |
| @Override |
| public void process(WatchedEvent event) throws Exception { |
| // everything will be ignored |
| } |
| }; |
| |
| class FaultySharedValue extends SharedValue { |
| public FaultySharedValue(CuratorFramework client, String path, byte[] seedValue) { |
| super(client.newWatcherRemoveCuratorFramework(), path, seedValue, faultyWatcher); |
| } |
| }; |
| |
| final SharedValue faultySharedValue = new FaultySharedValue(curatorFramework, path, SharedCount.toBytes(val)); |
| class FaultySharedCount extends SharedCount { |
| public FaultySharedCount(CuratorFramework client, String path, int val) { |
| super(client, path, faultySharedValue); |
| } |
| }; |
| return new FaultySharedCount(curatorFramework, path, val); |
| } |
| |
| |
| } |