package org.apache.helix.lockmanager;
/*
* 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.
*/
import java.util.List;
import org.apache.helix.HelixManager;
import org.apache.helix.HelixManagerFactory;
import org.apache.helix.InstanceType;
import org.apache.helix.api.id.StateModelDefId;
import org.apache.helix.controller.HelixControllerMain;
import org.apache.helix.manager.zk.ZKHelixAdmin;
import org.apache.helix.model.InstanceConfig;
public class LockProcess {
private String clusterName;
private String zkAddress;
private String instanceName;
private HelixManager participantManager;
private boolean startController;
private HelixManager controllerManager;
LockProcess(String clusterName, String zkAddress, String instanceName, boolean startController) {
this.clusterName = clusterName;
this.zkAddress = zkAddress;
this.instanceName = instanceName;
this.startController = startController;
}
public void start() throws Exception {
System.out.println("STARTING " + instanceName);
configureInstance(instanceName);
participantManager =
HelixManagerFactory.getZKHelixManager(clusterName, instanceName, InstanceType.PARTICIPANT,
zkAddress);
participantManager.getStateMachineEngine().registerStateModelFactory(
StateModelDefId.from("OnlineOffline"), new LockFactory());
participantManager.connect();
if (startController) {
startController();
}
System.out.println("STARTED " + instanceName);
}
private void startController() {
controllerManager =
HelixControllerMain.startHelixController(zkAddress, clusterName, "controller",
HelixControllerMain.STANDALONE);
}
/**
* Configure the instance, the configuration of each node is available to
* other nodes.
* @param instanceName
*/
private void configureInstance(String instanceName) {
ZKHelixAdmin helixAdmin = new ZKHelixAdmin(zkAddress);
List<String> instancesInCluster = helixAdmin.getInstancesInCluster(clusterName);
if (instancesInCluster == null || !instancesInCluster.contains(instanceName)) {
InstanceConfig config = new InstanceConfig(instanceName);
config.setHostName("localhost");
config.setPort("12000");
helixAdmin.addInstance(clusterName, config);
}
}
public void stop() {
if (participantManager != null) {
participantManager.disconnect();
}
if (controllerManager != null) {
controllerManager.disconnect();
}
}
public static void main(String[] args) throws Exception {
String zkAddress = "localhost:2199";
String clusterName = "lock-manager-demo";
// Give a unique id to each process, most commonly used format hostname_port
final String instanceName = "localhost_12000";
boolean startController = true;
final LockProcess lockProcess =
new LockProcess(clusterName, zkAddress, instanceName, startController);
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
System.out.println("Shutting down " + instanceName);
lockProcess.stop();
}
});
lockProcess.start();
Thread.currentThread().join();
}
}