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.Date;
  
  import org.apache.helix.HelixDataAccessor;
  import org.apache.helix.TestHelper;
  import org.apache.helix.ZNRecord;
  import org.apache.helix.manager.zk.ZKHelixDataAccessor;
  import org.apache.helix.manager.zk.ZNRecordSerializer;
  import org.apache.helix.manager.zk.ZkBaseDataAccessor;
  import org.apache.helix.manager.zk.ZkClient;
  import org.apache.helix.mock.controller.ClusterController;
  import org.apache.helix.mock.participant.MockParticipant;
  import org.apache.helix.model.PauseSignal;
  import org.apache.helix.tools.ClusterSetup;
  import org.apache.helix.tools.ClusterStateVerifier;
  import org.apache.helix.tools.ClusterStateVerifier.BestPossAndExtViewZkVerifier;
  import org.testng.Assert;
  import org.testng.annotations.Test;
  
  
  public class TestPauseSignal extends ZkIntegrationTestBase
  {
    @Test()
    public void testPauseSignal() throws Exception
    {
      // Logger.getRootLogger().setLevel(Level.INFO);
      String className = TestHelper.getTestClassName();
      String methodName = TestHelper.getTestMethodName();
      final String clusterName = className + "_" + methodName;
  
      System.out.println("START " + clusterName + " at "
          + new Date(System.currentTimeMillis()));
  
      MockParticipant[] participants = new MockParticipant[5];
  
      TestHelper.setupCluster(clusterName, ZK_ADDR, 12918, // participant port
                              "localhost", // participant name prefix
                              "TestDB", // resource name prefix
                              1, // resources
                              10, // partitions per resource
                              5, // number of nodes
                              3, // replicas
                              "MasterSlave",
                              true); // do rebalance
  
      // start controller
      ClusterController controller =
          new ClusterController(clusterName, "controller_0", ZK_ADDR);
      controller.syncStart();
  
      // 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 BestPossAndExtViewZkVerifier(ZK_ADDR,
                                                                                   clusterName));
      Assert.assertTrue(result);
  
      // pause the cluster and make sure pause is persistent
      ZkClient zkClient = new ZkClient(ZK_ADDR);
      zkClient.setZkSerializer(new ZNRecordSerializer());
      final HelixDataAccessor tmpAccessor =
          new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor<ZNRecord>(zkClient));
      
      String cmd = "-zkSvr " + ZK_ADDR + " -enableCluster " + clusterName + " false";
      ClusterSetup.processCommandLineArgs(cmd.split(" "));
      
      tmpAccessor.setProperty(tmpAccessor.keyBuilder().pause(), new PauseSignal("pause"));
      zkClient.close();
      
      // wait for controller to be signaled by pause
      Thread.sleep(1000);
  
     // add a new resource group
     ClusterSetup setupTool = new ClusterSetup(ZK_ADDR);
     setupTool.addResourceToCluster(clusterName, "TestDB1", 10, "MasterSlave");
     setupTool.rebalanceStorageCluster(clusterName, "TestDB1", 3);
 
     // make sure TestDB1 external view is empty
     TestHelper.verifyWithTimeout("verifyEmptyCurStateAndExtView",
                                  1000,
                                  clusterName,
                                  "TestDB1",
                                  TestHelper.<String> setOf("localhost_12918",
                                                            "localhost_12919",
                                                            "localhost_12920",
                                                            "localhost_12921",
                                                            "localhost_12922"),
                                  ZK_ADDR);
 
     // resume controller
     final HelixDataAccessor accessor =
         new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor<ZNRecord>(_gZkClient));
 
     cmd = "-zkSvr " + ZK_ADDR + " -enableCluster " + clusterName + " true";
     ClusterSetup.processCommandLineArgs(cmd.split(" "));
     result =
         ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(ZK_ADDR,
                                                                                  clusterName));
     Assert.assertTrue(result);
 
     // clean up
     for (int i = 0; i < 5; i++)
     {
       participants[i].syncStop();
     }
 
     Thread.sleep(2000);
     controller.syncStop();
 
     System.out.println("END " + clusterName + " at "
         + new Date(System.currentTimeMillis()));
   }
 }