| /** |
| * 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.distributedlog; |
| |
| import com.google.common.base.Stopwatch; |
| |
| import org.apache.zookeeper.KeeperException; |
| import org.apache.zookeeper.WatchedEvent; |
| import org.apache.zookeeper.Watcher; |
| import org.apache.zookeeper.ZooKeeper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| |
| import static org.junit.Assert.*; |
| |
| /** |
| * Utilities of {@link org.apache.distributedlog.ZooKeeperClient} |
| */ |
| public class ZooKeeperClientUtils { |
| |
| static final Logger logger = LoggerFactory.getLogger(ZooKeeperClientUtils.class); |
| |
| /** |
| * Expire given zookeeper client's session. |
| * |
| * @param zkc |
| * zookeeper client |
| * @param zkServers |
| * zookeeper servers |
| * @param timeout |
| * timeout |
| * @throws Exception |
| */ |
| public static void expireSession(ZooKeeperClient zkc, String zkServers, int timeout) |
| throws Exception { |
| final CountDownLatch expireLatch = new CountDownLatch(1); |
| final CountDownLatch latch = new CountDownLatch(1); |
| ZooKeeper oldZk = zkc.get(); |
| oldZk.exists("/", new Watcher() { |
| @Override |
| public void process(WatchedEvent event) { |
| logger.debug("Receive event : {}", event); |
| if (event.getType() == Event.EventType.None && |
| event.getState() == Event.KeeperState.Expired) { |
| expireLatch.countDown(); |
| } |
| } |
| }); |
| ZooKeeper newZk = new ZooKeeper(zkServers, timeout, new Watcher() { |
| @Override |
| public void process(WatchedEvent event) { |
| if (Event.EventType.None == event.getType() && |
| Event.KeeperState.SyncConnected == event.getState()) { |
| latch.countDown(); |
| } |
| } |
| }, oldZk.getSessionId(), oldZk.getSessionPasswd()); |
| if (!latch.await(timeout, TimeUnit.MILLISECONDS)) { |
| throw KeeperException.create(KeeperException.Code.CONNECTIONLOSS); |
| } |
| newZk.close(); |
| |
| boolean done = false; |
| Stopwatch expireWait = Stopwatch.createStarted(); |
| while (!done && expireWait.elapsed(TimeUnit.MILLISECONDS) < timeout*2) { |
| try { |
| zkc.get().exists("/", false); |
| done = true; |
| } catch (KeeperException ke) { |
| done = (ke.code() == KeeperException.Code.SESSIONEXPIRED); |
| } |
| } |
| |
| assertTrue("Client should receive session expired event.", |
| expireLatch.await(timeout, TimeUnit.MILLISECONDS)); |
| } |
| } |