| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.hadoop.hbase.oss.sync; |
| |
| import java.net.InetAddress; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.oss.Constants; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.apache.yetus.audience.InterfaceStability; |
| |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class EmbeddedZK { |
| |
| // Guards `testUtil` -- making sure we don't start mulitple ZKs. |
| private final ReentrantReadWriteLock LOCK = new ReentrantReadWriteLock(); |
| private Object testUtil = null; |
| private String connectionString = null; |
| |
| public void conditionalStart(Configuration conf) throws Exception { |
| Class<?> implementation = conf.getClass(Constants.SYNC_IMPL, TreeLockManager.class); |
| if (implementation != ZKTreeLockManager.class) { |
| return; |
| } |
| LOCK.readLock().lock(); |
| if (testUtil == null) { |
| LOCK.readLock().unlock(); |
| try { |
| LOCK.writeLock().lock(); |
| // If the server is non-null after we took the lock, someone else just beat |
| // us here. Bail out. |
| if (testUtil != null) { |
| return; |
| } |
| |
| start(conf); |
| } finally { |
| LOCK.writeLock().unlock(); |
| } |
| } else { |
| // Set the ZK connection details into this conf. It might not have them. |
| setConfiguration(conf); |
| LOCK.readLock().unlock(); |
| } |
| } |
| |
| /** |
| * Requires external synchronization! |
| */ |
| protected void start(Configuration conf) throws Exception { |
| Class<?> testUtilImpl; |
| try { |
| testUtilImpl = Class.forName("org.apache.hadoop.hbase.HBaseZKTestingUtility"); |
| } catch (ClassNotFoundException ex) { |
| testUtilImpl = Class.forName("org.apache.hadoop.hbase.HBaseTestingUtility"); |
| } |
| testUtil = testUtilImpl.getDeclaredConstructor(Configuration.class).newInstance(conf); |
| testUtil.getClass().getDeclaredMethod("startMiniZKCluster").invoke(testUtil); |
| |
| Object zkCluster = testUtil.getClass().getDeclaredMethod("getZkCluster").invoke(testUtil); |
| int port = (int) zkCluster.getClass().getDeclaredMethod("getClientPort").invoke(zkCluster); |
| String hostname = InetAddress.getLoopbackAddress().getHostName(); |
| connectionString = hostname + ":" + port; |
| setConfiguration(conf); |
| } |
| |
| public void conditionalStop() throws Exception { |
| try { |
| LOCK.writeLock().lock(); |
| if (testUtil != null) { |
| testUtil.getClass().getDeclaredMethod("shutdownMiniZKCluster").invoke(testUtil); |
| testUtil = null; |
| } |
| } finally { |
| LOCK.writeLock().unlock(); |
| } |
| } |
| |
| protected void setConfiguration(Configuration conf) { |
| conf.set(Constants.ZK_CONN_STRING, connectionString); |
| conf.set(HConstants.ZOOKEEPER_QUORUM, connectionString); |
| } |
| |
| protected String getConnectionString() { |
| try { |
| LOCK.readLock().lock(); |
| return connectionString; |
| } finally { |
| LOCK.readLock().unlock(); |
| } |
| } |
| } |