| /** |
| * 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.x.discovery.details; |
| |
| import static org.junit.jupiter.api.Assertions.assertTrue; |
| import com.google.common.collect.Lists; |
| import org.apache.curator.framework.CuratorFramework; |
| import org.apache.curator.framework.CuratorFrameworkFactory; |
| import org.apache.curator.framework.state.ConnectionState; |
| import org.apache.curator.retry.RetryOneTime; |
| import org.apache.curator.test.BaseClassForTests; |
| import org.apache.curator.test.Timing; |
| import org.apache.curator.test.compatibility.CuratorTestBase; |
| import org.apache.curator.utils.CloseableExecutorService; |
| import org.apache.curator.utils.CloseableUtils; |
| import org.apache.curator.x.discovery.ServiceCache; |
| import org.apache.curator.x.discovery.ServiceDiscovery; |
| import org.apache.curator.x.discovery.ServiceDiscoveryBuilder; |
| import org.apache.curator.x.discovery.ServiceInstance; |
| import org.junit.jupiter.api.Tag; |
| import org.junit.jupiter.api.Test; |
| import org.slf4j.LoggerFactory; |
| import java.io.Closeable; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.Executors; |
| |
| @Tag(CuratorTestBase.zk35TestCompatibilityGroup) |
| public class TestServiceCacheRace extends BaseClassForTests |
| { |
| private final Timing timing = new Timing(); |
| |
| // validates CURATOR-452 which exposed a race in ServiceCacheImpl's start() method caused by an optimization whereby it clears the dataBytes of its internal PathChildrenCache |
| @Test |
| public void testRaceOnInitialLoad() throws Exception |
| { |
| List<Closeable> closeables = Lists.newArrayList(); |
| try |
| { |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1)); |
| closeables.add(client); |
| client.start(); |
| |
| ServiceDiscovery<String> discovery = ServiceDiscoveryBuilder.builder(String.class).basePath("/discovery").client(client).build(); |
| closeables.add(discovery); |
| discovery.start(); |
| |
| CountDownLatch cacheStartLatch = new CountDownLatch(1); |
| CountDownLatch cacheWaitLatch = new CountDownLatch(1); |
| final ServiceCache<String> cache = discovery.serviceCacheBuilder().name("test").build(); |
| closeables.add(cache); |
| ((ServiceCacheImpl)cache).debugStartLatch = cacheStartLatch; // causes ServiceCacheImpl.start to notify just after starting its internal PathChildrenCache |
| ((ServiceCacheImpl)cache).debugStartWaitLatch = cacheWaitLatch; // causes ServiceCacheImpl.start to wait before iterating over its internal PathChildrenCache |
| |
| ServiceInstance<String> instance1 = ServiceInstance.<String>builder().payload("test").name("test").port(10064).build(); |
| discovery.registerService(instance1); |
| |
| CloseableExecutorService closeableExecutorService = new CloseableExecutorService(Executors.newSingleThreadExecutor()); |
| closeables.add(closeableExecutorService); |
| final CountDownLatch startCompletedLatch = new CountDownLatch(1); |
| Runnable proc = new Runnable() |
| { |
| @Override |
| public void run() |
| { |
| try |
| { |
| cache.start(); |
| startCompletedLatch.countDown(); |
| } |
| catch ( Exception e ) |
| { |
| LoggerFactory.getLogger(getClass()).error("Start failed", e); |
| throw new RuntimeException(e); |
| } |
| } |
| }; |
| closeableExecutorService.submit(proc); |
| assertTrue(timing.awaitLatch(cacheStartLatch)); // wait until ServiceCacheImpl's internal PathChildrenCache is started and primed |
| |
| final CountDownLatch cacheChangedLatch = new CountDownLatch(1); |
| ServiceCacheListener listener = new ServiceCacheListener() |
| { |
| @Override |
| public void cacheChanged() |
| { |
| cacheChangedLatch.countDown(); |
| } |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| // NOP |
| } |
| }; |
| cache.addListener(listener); |
| ServiceInstance<String> instance2 = ServiceInstance.<String>builder().payload("test").name("test").port(10065).build(); |
| discovery.registerService(instance2); // cause ServiceCacheImpl's internal PathChildrenCache listener to get called which will clear the dataBytes |
| assertTrue(timing.awaitLatch(cacheChangedLatch)); |
| |
| cacheWaitLatch.countDown(); |
| |
| assertTrue(timing.awaitLatch(startCompletedLatch)); |
| } |
| finally |
| { |
| Collections.reverse(closeables); |
| for ( Closeable c : closeables ) |
| { |
| CloseableUtils.closeQuietly(c); |
| } |
| } |
| } |
| } |