| /** |
| * 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.test; |
| |
| import org.apache.zookeeper.WatchedEvent; |
| import org.apache.zookeeper.Watcher; |
| import org.apache.zookeeper.ZooKeeper; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * <p> |
| * Utility to simulate a ZK session dying. See: <a href="http://wiki.apache.org/hadoop/ZooKeeper/FAQ#A4">ZooKeeper FAQ</a> |
| * </p> |
| * |
| * <blockquote> |
| * In the case of testing we want to cause a problem, so to explicitly expire a session an |
| * application connects to ZooKeeper, saves the session id and password, creates another |
| * ZooKeeper handle with that id and password, and then closes the new handle. Since both |
| * handles reference the same session, the close on second handle will invalidate the session |
| * causing a SESSION_EXPIRED on the first handle. |
| * </blockquote> |
| */ |
| public class KillSession |
| { |
| /** |
| * Kill the given ZK session |
| * |
| * @param client the client to kill |
| * @param connectString server connection string |
| * @throws Exception errors |
| */ |
| public static void kill(ZooKeeper client, String connectString) throws Exception |
| { |
| kill(client, connectString, new Timing().forWaiting().milliseconds()); |
| } |
| |
| /** |
| * Kill the given ZK session |
| * |
| * @param client the client to kill |
| * @param connectString server connection string |
| * @param maxMs max time ms to wait for kill |
| * @throws Exception errors |
| */ |
| public static void kill(ZooKeeper client, String connectString, int maxMs) throws Exception |
| { |
| long startTicks = System.currentTimeMillis(); |
| |
| final CountDownLatch sessionLostLatch = new CountDownLatch(1); |
| Watcher sessionLostWatch = new Watcher() |
| { |
| @Override |
| public void process(WatchedEvent event) |
| { |
| sessionLostLatch.countDown(); |
| } |
| }; |
| client.exists("/___CURATOR_KILL_SESSION___" + System.nanoTime(), sessionLostWatch); |
| |
| final CountDownLatch connectionLatch = new CountDownLatch(1); |
| Watcher connectionWatcher = new Watcher() |
| { |
| @Override |
| public void process(WatchedEvent event) |
| { |
| if ( event.getState() == Event.KeeperState.SyncConnected ) |
| { |
| connectionLatch.countDown(); |
| } |
| } |
| }; |
| ZooKeeper zk = new ZooKeeper(connectString, maxMs, connectionWatcher, client.getSessionId(), client.getSessionPasswd()); |
| try |
| { |
| if ( !connectionLatch.await(maxMs, TimeUnit.MILLISECONDS) ) |
| { |
| throw new Exception("KillSession could not establish duplicate session"); |
| } |
| try |
| { |
| zk.close(); |
| } |
| finally |
| { |
| zk = null; |
| } |
| |
| while ( client.getState().isConnected() && !sessionLostLatch.await(100, TimeUnit.MILLISECONDS) ) |
| { |
| long elapsed = System.currentTimeMillis() - startTicks; |
| if ( elapsed > maxMs ) |
| { |
| throw new Exception("KillSession timed out waiting for session to expire"); |
| } |
| } |
| } |
| finally |
| { |
| if ( zk != null ) |
| { |
| zk.close(); |
| } |
| } |
| } |
| } |