/**
* Copyright (C) 2012 LinkedIn Inc <opensource@linkedin.com>
*
* Licensed 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 com.linkedin.helix.mock.router;
import java.util.List;
import org.I0Itec.zkclient.IDefaultNameSpace;
import org.I0Itec.zkclient.ZkServer;
import com.linkedin.helix.HelixManager;
import com.linkedin.helix.HelixManagerFactory;
import com.linkedin.helix.InstanceType;
import com.linkedin.helix.ZNRecord;
import com.linkedin.helix.manager.zk.ZNRecordSerializer;
import com.linkedin.helix.model.InstanceConfig;
import com.linkedin.helix.spectator.RoutingTableProvider;
import com.linkedin.helix.tools.ClusterSetup;
import com.linkedin.helix.util.HelixUtil;
/**
* A MockRouter process to demonstrate the integration with cluster manager.
* This uses Zookeeper in local mode and runs at port 2188
*
* @author kgopalak
*
*/
public class MockRouterProcess
{
private static final int port = 2188;
static long runId = System.currentTimeMillis();
private static final String dataDir = "/tmp/zkDataDir-" + runId;
private static final String logDir = "/tmp/zkLogDir-" + runId;
static String clusterName = "mock-cluster-" + runId;
static String zkConnectString = "localhost:2188";
private final RoutingTableProvider _routingTableProvider;
private static ZkServer zkServer;
public MockRouterProcess()
{
_routingTableProvider = new RoutingTableProvider();
}
public static void main(String[] args) throws Exception
{
setup();
zkServer.getZkClient().setZkSerializer(new ZNRecordSerializer());
ZNRecord record = zkServer.getZkClient().readData(
HelixUtil.getIdealStatePath(clusterName, "TestDB"));
String externalViewPath = HelixUtil.getExternalViewPath(clusterName, "TestDB");
MockRouterProcess process = new MockRouterProcess();
process.start();
//try to route, there is no master or slave available
process.routeRequest("TestDB", "TestDB_1");
//update the externalview on zookeeper
zkServer.getZkClient().createPersistent(externalViewPath,record);
//sleep for sometime so that the ZK Callback is received.
Thread.sleep(1000);
process.routeRequest("TestDB", "TestDB_1");
System.exit(1);
}
private static void setup()
{
IDefaultNameSpace defaultNameSpace = new IDefaultNameSpace()
{
@Override
public void createDefaultNameSpace(org.I0Itec.zkclient.ZkClient client)
{
client.deleteRecursive("/" + clusterName);
}
};
zkServer = new ZkServer(dataDir, logDir, defaultNameSpace, port);
zkServer.start();
ClusterSetup clusterSetup = new ClusterSetup(zkConnectString);
clusterSetup.setupTestCluster(clusterName);
try
{
Thread.sleep(1000);
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
public void routeRequest(String database, String partition)
{
List<InstanceConfig> masters;
List<InstanceConfig> slaves;
masters = _routingTableProvider.getInstances(database, partition, "MASTER");
if (masters != null && !masters.isEmpty())
{
System.out.println("Available masters to route request");
for (InstanceConfig config : masters)
{
System.out.println("HostName:" + config.getHostName() + " Port:"
+ config.getPort());
}
} else
{
System.out.println("No masters available to route request");
}
slaves = _routingTableProvider.getInstances(database, partition, "SLAVE");
if (slaves != null && !slaves.isEmpty())
{
System.out.println("Available slaves to route request");
for (InstanceConfig config : slaves)
{
System.out.println("HostName:" + config.getHostName() + " Port:"
+ config.getPort());
}
} else
{
System.out.println("No slaves available to route request");
}
}
public void start()
{
try
{
HelixManager manager = HelixManagerFactory.getZKHelixManager(clusterName,
null,
InstanceType.SPECTATOR,
zkConnectString);
manager.connect();
manager.addExternalViewChangeListener(_routingTableProvider);
} catch (Exception e)
{
e.printStackTrace();
}
}
}