package org.apache.helix.mock.controller;
/*
* 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.concurrent.CountDownLatch;
import org.apache.helix.HelixManager;
import org.apache.helix.HelixManagerFactory;
import org.apache.helix.InstanceType;
import org.apache.helix.controller.HelixControllerMain;
import org.apache.helix.participant.DistClusterControllerStateModelFactory;
import org.apache.helix.participant.StateMachineEngine;
import org.apache.log4j.Logger;
public class ClusterController extends Thread
{
private static Logger LOG =
Logger.getLogger(ClusterController.class);
private final CountDownLatch _startCountDown = new CountDownLatch(1);
private final CountDownLatch _stopCountDown = new CountDownLatch(1);
private final CountDownLatch _waitStopFinishCountDown = new CountDownLatch(1);
private final String _controllerMode;
private final String _zkAddr;
private HelixManager _manager;
public ClusterController(String clusterName, String controllerName, String zkAddr) throws Exception
{
this(clusterName, controllerName, zkAddr, HelixControllerMain.STANDALONE.toString());
}
public ClusterController(String clusterName,
String controllerName,
String zkAddr,
String controllerMode) throws Exception
{
_controllerMode = controllerMode;
_zkAddr = zkAddr;
if (_controllerMode.equals(HelixControllerMain.STANDALONE.toString()))
{
_manager =
HelixManagerFactory.getZKHelixManager(clusterName,
controllerName,
InstanceType.CONTROLLER,
zkAddr);
}
else if (_controllerMode.equals(HelixControllerMain.DISTRIBUTED.toString()))
{
_manager =
HelixManagerFactory.getZKHelixManager(clusterName,
controllerName,
InstanceType.CONTROLLER_PARTICIPANT,
zkAddr);
}
else
{
throw new IllegalArgumentException("Controller mode: " + controllerMode
+ " NOT recoginized");
}
}
public HelixManager getManager()
{
return _manager;
}
public void syncStop()
{
if (_manager == null)
{
LOG.warn("manager already stopped");
return;
}
_stopCountDown.countDown();
try
{
_waitStopFinishCountDown.await();
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void syncStart()
{
// TODO: prevent start multiple times
super.start();
try
{
_startCountDown.await();
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run()
{
try
{
try
{
if (_controllerMode.equals(HelixControllerMain.STANDALONE.toString()))
{
_manager.connect();
}
else if (_controllerMode.equals(HelixControllerMain.DISTRIBUTED.toString()))
{
DistClusterControllerStateModelFactory stateModelFactory =
new DistClusterControllerStateModelFactory(_zkAddr);
StateMachineEngine stateMach = _manager.getStateMachineEngine();
stateMach.registerStateModelFactory("LeaderStandby", stateModelFactory);
_manager.connect();
}
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
finally
{
_startCountDown.countDown();
_stopCountDown.await();
}
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
finally
{
synchronized (_manager)
{
_manager.disconnect();
_manager = null;
}
_waitStopFinishCountDown.countDown();
}
}
}