/*
* Copyright 2011 The Apache Software Foundation
*
* 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.lealone.hbase.engine;
import java.io.IOException;
import org.apache.hadoop.hbase.CoprocessorEnvironment;
import org.apache.hadoop.hbase.coprocessor.BaseMasterObserver;
import org.apache.hadoop.hbase.coprocessor.MasterCoprocessorEnvironment;
import org.apache.hadoop.hbase.master.HMaster;
import org.lealone.hbase.server.HBaseTcpServer;
import org.lealone.hbase.transaction.TimestampService;
/**
*
* 无法替换org.apache.hadoop.hbase.master.HMaster类，只能使用coprocessor的方式，
* 在hbase-site.xml中配置hbase.coprocessor.master.classes = org.lealone.hbase.engine.HBaseMasterObserver
*
*/
public class HBaseMasterObserver extends BaseMasterObserver {
private static HBaseTcpServer server;
private static String hostAndPort;
private static TimestampService timestampService;
public static TimestampService getTimestampService() {
if (hostAndPort == null)
throw new IllegalStateException("TCP server is not started");
if (timestampService == null)
timestampService = new TimestampService(hostAndPort);
return timestampService;
}
@Override
public synchronized void start(CoprocessorEnvironment env) throws IOException {
if (server == null) {
HMaster m = (HMaster) ((MasterCoprocessorEnvironment) env).getMasterServices();
hostAndPort = m.getServerName().getHostAndPort();
timestampService = null;
server = new HBaseTcpServer(m);
server.start();
}
}
@Override
public synchronized void stop(CoprocessorEnvironment env) throws IOException {
if (server != null) {
try {
server.stop();
} finally {
server = null;
}
}
}
}