Package org.apache.helix.mock.spectator

Source Code of org.apache.helix.mock.spectator.MockSpectatorProcess

package org.apache.helix.mock.spectator;

/*
* 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.I0Itec.zkclient.IDefaultNameSpace;
import org.I0Itec.zkclient.ZkServer;
import org.apache.helix.HelixManager;
import org.apache.helix.HelixManagerFactory;
import org.apache.helix.InstanceType;
import org.apache.helix.ZNRecord;
import org.apache.helix.manager.zk.ZNRecordSerializer;
import org.apache.helix.model.InstanceConfig;
import org.apache.helix.spectator.RoutingTableProvider;
import org.apache.helix.tools.ClusterSetup;
import org.apache.helix.util.HelixUtil;


/**
* A MockSpectatorProcess to demonstrate the integration with cluster manager.
* This uses Zookeeper in local mode and runs at port 2188
*
*/
public class MockSpectatorProcess
{
  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 MockSpectatorProcess()
  {
    _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");

    MockSpectatorProcess process = new MockSpectatorProcess();
    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();
    }
  }
}
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