package org.apache.helix.integration;
   
   /*
    * 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.ArrayList;
  import java.util.Date;
  import java.util.List;
  
  import org.apache.helix.TestHelper;
  import org.apache.helix.ZNRecord;
  import org.apache.helix.PropertyKey.Builder;
  import org.apache.helix.controller.HelixControllerMain;
  import org.apache.helix.manager.zk.ZkBaseDataAccessor;
  import org.apache.helix.mock.participant.MockParticipant;
  import org.apache.helix.tools.ClusterStateVerifier;
  import org.apache.helix.tools.ClusterStateVerifier.BestPossAndExtViewZkVerifier;
  import org.apache.helix.tools.ClusterStateVerifier.MasterNbInExtViewVerifier;
  import org.apache.zookeeper.data.Stat;
  import org.testng.Assert;
  import org.testng.annotations.Test;
  
  
  public class TestExternalViewUpdates extends ZkIntegrationTestBase
  {
    @Test
    public void testExternalViewUpdates() throws Exception
    {
      System.out.println("START testExternalViewUpdates at "
          + new Date(System.currentTimeMillis()));
  
      String clusterName = getShortClassName();
      MockParticipant[] participants = new MockParticipant[5];
      int resourceNb = 10;
      TestHelper.setupCluster(clusterName, ZK_ADDR, 12918, // participant port
                              "localhost", // participant name prefix
                              "TestDB", // resource name prefix
                              resourceNb, // resources
                              1, // partitions per resource
                              5, // number of nodes
                              1, // replicas
                              "MasterSlave",
                              true); // do rebalance
  
      TestHelper.startController(clusterName,
                                 "controller_0",
                                 ZK_ADDR,
                                 HelixControllerMain.STANDALONE);
      // start participants
      for (int i = 0; i < 5; i++)
      {
        String instanceName = "localhost_" + (12918 + i);
  
        participants[i] = new MockParticipant(clusterName, instanceName, ZK_ADDR, null);
        participants[i].syncStart();
      }
  
      boolean result =
          ClusterStateVerifier.verifyByZkCallback(new MasterNbInExtViewVerifier(ZK_ADDR,
                                                                                clusterName));
      Assert.assertTrue(result);
  
      result =
          ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(ZK_ADDR,
                                                                                   clusterName));
      Assert.assertTrue(result);
  
      // need to verify that each ExternalView's version number is 2
      Builder keyBuilder = new Builder(clusterName);
      ZkBaseDataAccessor<ZNRecord> accessor = new ZkBaseDataAccessor<ZNRecord>(_gZkClient);
      String parentPath = keyBuilder.externalViews().getPath();
      List<String> childNames = accessor.getChildNames(parentPath, 0);
      
      List<String> paths = new ArrayList<String>();
      for (String name : childNames)
      {
        paths.add(parentPath + "/" + name);
      }
      
  //    Stat[] stats = accessor.getStats(paths);
      for (String path : paths)
      {
        Stat stat = accessor.getStat(path, 0);
       Assert.assertTrue(stat.getVersion() <= 2, "ExternalView should be updated at most 2 times");
     }
     
     // TODO: need stop controller and participants
     
     System.out.println("END testExternalViewUpdates at "
         + new Date(System.currentTimeMillis()));
   }
 }