| /** |
| * 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.cache; |
| |
| import org.apache.curator.framework.imps.TestCleanState; |
| import org.apache.curator.test.BaseClassForTests; |
| import org.apache.curator.utils.CloseableUtils; |
| import org.apache.curator.framework.CuratorFramework; |
| import org.apache.curator.framework.CuratorFrameworkFactory; |
| import org.apache.curator.framework.api.UnhandledErrorListener; |
| import org.apache.curator.retry.RetryOneTime; |
| import org.apache.curator.test.KillSession; |
| import org.apache.curator.test.Timing; |
| import org.testng.Assert; |
| import org.testng.annotations.Test; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.Exchanger; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| public class TestNodeCache extends BaseClassForTests |
| { |
| @Test |
| public void testDeleteThenCreate() throws Exception |
| { |
| NodeCache cache = null; |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| client.start(); |
| try |
| { |
| client.create().creatingParentsIfNeeded().forPath("/test/foo", "one".getBytes()); |
| |
| final AtomicReference<Throwable> error = new AtomicReference<Throwable>(); |
| client.getUnhandledErrorListenable().addListener |
| ( |
| new UnhandledErrorListener() |
| { |
| @Override |
| public void unhandledError(String message, Throwable e) |
| { |
| error.set(e); |
| } |
| } |
| ); |
| |
| final Semaphore semaphore = new Semaphore(0); |
| cache = new NodeCache(client, "/test/foo"); |
| cache.getListenable().addListener |
| ( |
| new NodeCacheListener() |
| { |
| @Override |
| public void nodeChanged() throws Exception |
| { |
| semaphore.release(); |
| } |
| } |
| ); |
| cache.start(true); |
| |
| Assert.assertEquals(cache.getCurrentData().getData(), "one".getBytes()); |
| |
| client.delete().forPath("/test/foo"); |
| Assert.assertTrue(semaphore.tryAcquire(1, 10, TimeUnit.SECONDS)); |
| client.create().forPath("/test/foo", "two".getBytes()); |
| Assert.assertTrue(semaphore.tryAcquire(1, 10, TimeUnit.SECONDS)); |
| |
| Throwable t = error.get(); |
| if ( t != null ) |
| { |
| Assert.fail("Assert", t); |
| } |
| |
| Assert.assertEquals(cache.getCurrentData().getData(), "two".getBytes()); |
| |
| cache.close(); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(cache); |
| TestCleanState.closeAndTestClean(client); |
| } |
| } |
| |
| @Test |
| public void testRebuildAgainstOtherProcesses() throws Exception |
| { |
| NodeCache cache = null; |
| final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| client.start(); |
| try |
| { |
| client.create().forPath("/test"); |
| client.create().forPath("/test/snafu", "original".getBytes()); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| cache = new NodeCache(client, "/test/snafu"); |
| cache.getListenable().addListener |
| ( |
| new NodeCacheListener() |
| { |
| @Override |
| public void nodeChanged() throws Exception |
| { |
| latch.countDown(); |
| } |
| } |
| ); |
| cache.rebuildTestExchanger = new Exchanger<Object>(); |
| |
| ExecutorService service = Executors.newSingleThreadExecutor(); |
| final NodeCache finalCache = cache; |
| Future<Object> future = service.submit |
| ( |
| new Callable<Object>() |
| { |
| @Override |
| public Object call() throws Exception |
| { |
| finalCache.rebuildTestExchanger.exchange(new Object(), 10, TimeUnit.SECONDS); |
| |
| // simulate another process updating the node while we're rebuilding |
| client.setData().forPath("/test/snafu", "other".getBytes()); |
| |
| ChildData currentData = finalCache.getCurrentData(); |
| Assert.assertNotNull(currentData); |
| |
| finalCache.rebuildTestExchanger.exchange(new Object(), 10, TimeUnit.SECONDS); |
| |
| return null; |
| } |
| } |
| ); |
| cache.start(false); |
| future.get(); |
| |
| Assert.assertTrue(latch.await(10, TimeUnit.SECONDS)); |
| Assert.assertNotNull(cache.getCurrentData()); |
| Assert.assertEquals(cache.getCurrentData().getData(), "other".getBytes()); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(cache); |
| TestCleanState.closeAndTestClean(client); |
| } |
| } |
| |
| @Test |
| public void testKilledSession() throws Exception |
| { |
| NodeCache cache = null; |
| Timing timing = new Timing(); |
| CuratorFramework client = null; |
| try |
| { |
| client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1)); |
| client.start(); |
| client.create().creatingParentsIfNeeded().forPath("/test/node", "start".getBytes()); |
| |
| cache = new NodeCache(client, "/test/node"); |
| cache.start(true); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| cache.getListenable().addListener |
| ( |
| new NodeCacheListener() |
| { |
| @Override |
| public void nodeChanged() throws Exception |
| { |
| latch.countDown(); |
| } |
| } |
| ); |
| |
| KillSession.kill(client.getZookeeperClient().getZooKeeper(), server.getConnectString()); |
| Thread.sleep(timing.multiple(1.5).session()); |
| |
| Assert.assertEquals(cache.getCurrentData().getData(), "start".getBytes()); |
| |
| client.setData().forPath("/test/node", "new data".getBytes()); |
| Assert.assertTrue(timing.awaitLatch(latch)); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(cache); |
| TestCleanState.closeAndTestClean(client); |
| } |
| } |
| |
| @Test |
| public void testBasics() throws Exception |
| { |
| NodeCache cache = null; |
| Timing timing = new Timing(); |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1)); |
| client.start(); |
| try |
| { |
| client.create().forPath("/test"); |
| |
| cache = new NodeCache(client, "/test/node"); |
| cache.start(true); |
| |
| final Semaphore semaphore = new Semaphore(0); |
| cache.getListenable().addListener |
| ( |
| new NodeCacheListener() |
| { |
| @Override |
| public void nodeChanged() throws Exception |
| { |
| semaphore.release(); |
| } |
| } |
| ); |
| |
| Assert.assertNull(cache.getCurrentData()); |
| |
| client.create().forPath("/test/node", "a".getBytes()); |
| Assert.assertTrue(timing.acquireSemaphore(semaphore)); |
| Assert.assertEquals(cache.getCurrentData().getData(), "a".getBytes()); |
| |
| client.setData().forPath("/test/node", "b".getBytes()); |
| Assert.assertTrue(timing.acquireSemaphore(semaphore)); |
| Assert.assertEquals(cache.getCurrentData().getData(), "b".getBytes()); |
| |
| client.delete().forPath("/test/node"); |
| Assert.assertTrue(timing.acquireSemaphore(semaphore)); |
| Assert.assertNull(cache.getCurrentData()); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(cache); |
| TestCleanState.closeAndTestClean(client); |
| } |
| } |
| } |