| /* |
| * 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.twill.internal.state; |
| |
| import com.google.common.base.Charsets; |
| import com.google.common.base.Joiner; |
| import com.google.common.base.Preconditions; |
| import com.google.common.base.Suppliers; |
| import com.google.common.util.concurrent.AbstractIdleService; |
| import com.google.common.util.concurrent.FutureCallback; |
| import com.google.common.util.concurrent.Futures; |
| import com.google.common.util.concurrent.Service; |
| import com.google.gson.Gson; |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonObject; |
| import org.apache.twill.api.RunId; |
| import org.apache.twill.internal.RunIds; |
| import org.apache.twill.internal.ZKServiceDecorator; |
| import org.apache.twill.internal.zookeeper.InMemoryZKServer; |
| import org.apache.twill.zookeeper.NodeData; |
| import org.apache.twill.zookeeper.ZKClientService; |
| import org.apache.twill.zookeeper.ZKClients; |
| import org.apache.zookeeper.CreateMode; |
| import org.apache.zookeeper.WatchedEvent; |
| import org.apache.zookeeper.Watcher; |
| import org.apache.zookeeper.data.Stat; |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| /** |
| * |
| */ |
| public class ZKServiceDecoratorTest { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ZKServiceDecoratorTest.class); |
| |
| @Test |
| public void testStateTransition() throws InterruptedException, ExecutionException, TimeoutException { |
| InMemoryZKServer zkServer = InMemoryZKServer.builder().build(); |
| zkServer.startAndWait(); |
| |
| try { |
| final String namespace = Joiner.on('/').join("/twill", RunIds.generate(), "runnables", "Runner1"); |
| |
| final ZKClientService zkClient = ZKClientService.Builder.of(zkServer.getConnectionStr()).build(); |
| zkClient.startAndWait(); |
| zkClient.create(namespace, null, CreateMode.PERSISTENT).get(); |
| |
| try { |
| JsonObject content = new JsonObject(); |
| content.addProperty("containerId", "container-123"); |
| content.addProperty("host", "localhost"); |
| |
| RunId runId = RunIds.generate(); |
| final Semaphore semaphore = new Semaphore(0); |
| ZKServiceDecorator service = new ZKServiceDecorator(ZKClients.namespace(zkClient, namespace), |
| runId, Suppliers.ofInstance(content), |
| new AbstractIdleService() { |
| @Override |
| protected void startUp() throws Exception { |
| Preconditions.checkArgument(semaphore.tryAcquire(5, TimeUnit.SECONDS), "Fail to start"); |
| } |
| |
| @Override |
| protected void shutDown() throws Exception { |
| Preconditions.checkArgument(semaphore.tryAcquire(5, TimeUnit.SECONDS), "Fail to stop"); |
| } |
| }); |
| |
| final String runnablePath = namespace + "/" + runId.getId(); |
| final AtomicReference<String> stateMatch = new AtomicReference<String>("STARTING"); |
| watchDataChange(zkClient, runnablePath + "/state", semaphore, stateMatch); |
| Assert.assertEquals(Service.State.RUNNING, service.start().get(5, TimeUnit.SECONDS)); |
| |
| stateMatch.set("STOPPING"); |
| Assert.assertEquals(Service.State.TERMINATED, service.stop().get(5, TimeUnit.SECONDS)); |
| |
| } finally { |
| zkClient.stopAndWait(); |
| } |
| } finally { |
| zkServer.stopAndWait(); |
| } |
| } |
| |
| private void watchDataChange(final ZKClientService zkClient, final String path, |
| final Semaphore semaphore, final AtomicReference<String> stateMatch) { |
| Futures.addCallback(zkClient.getData(path, new Watcher() { |
| @Override |
| public void process(WatchedEvent event) { |
| if (event.getType() == Event.EventType.NodeDataChanged) { |
| watchDataChange(zkClient, path, semaphore, stateMatch); |
| } |
| } |
| }), new FutureCallback<NodeData>() { |
| @Override |
| public void onSuccess(NodeData result) { |
| String content = new String(result.getData(), Charsets.UTF_8); |
| JsonObject json = new Gson().fromJson(content, JsonElement.class).getAsJsonObject(); |
| if (stateMatch.get().equals(json.get("state").getAsString())) { |
| semaphore.release(); |
| } |
| } |
| |
| @Override |
| public void onFailure(Throwable t) { |
| exists(); |
| } |
| |
| private void exists() { |
| Futures.addCallback(zkClient.exists(path, new Watcher() { |
| @Override |
| public void process(WatchedEvent event) { |
| if (event.getType() == Event.EventType.NodeCreated) { |
| watchDataChange(zkClient, path, semaphore, stateMatch); |
| } |
| } |
| }), new FutureCallback<Stat>() { |
| @Override |
| public void onSuccess(Stat result) { |
| if (result != null) { |
| watchDataChange(zkClient, path, semaphore, stateMatch); |
| } |
| } |
| |
| @Override |
| public void onFailure(Throwable t) { |
| LOG.error(t.getMessage(), t); |
| } |
| }); |
| } |
| }); |
| } |
| } |