Examples of org.apache.helix.HelixManager

org.apache.helix.HelixManager

First class Object any process will interact with
General flow

 manager = HelixManagerFactory.getManagerFor(); ROLE can be participant, spectator or a controller
 manager.connect(); manager.addSOMEListener(); manager.start() After start is invoked the subsequent interactions will be via listener onChange callbacks There will be 3 scenarios for onChange callback, which can be determined using NotificationContext.type INIT -> will be invoked the first time the listener is added CALLBACK -> will be invoked due to datachange in the property value FINALIZE -> will be invoked when listener is removed or session expires manager.disconnect()

Default implementations available @see HelixStateMachineEngine for participant @see RoutingTableProvider for spectator @see GenericHelixController for controller

  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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        + new Date(System.currentTimeMillis()));


    HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor(_gZkClient));


    HelixManager manager = new DummyClusterManager(clusterName, accessor);
    ClusterEvent event = new ClusterEvent("testEvent");
    event.addAttribute("helixmanager", manager);


    final String resourceName = "testResource_dup";
    String[] resourceGroups = new String[] { resourceName };

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    System.out.println("START " + clusterName + " at "
        + new Date(System.currentTimeMillis()));


    HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor(_gZkClient));
    HelixManager manager = new DummyClusterManager(clusterName, accessor);
    ClusterEvent event = new ClusterEvent("testEvent");


    final String resourceName = "testResource_dup";
    String[] resourceGroups = new String[] { resourceName };

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    System.out.println("START " + clusterName + " at "
        + new Date(System.currentTimeMillis()));


    HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor(_gZkClient));
    HelixManager manager = new DummyClusterManager(clusterName, accessor);
    ClusterEvent event = new ClusterEvent("testEvent");
    event.addAttribute("helixmanager", manager);


    final String resourceName = "testResource_pending";
    String[] resourceGroups = new String[] { resourceName };

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    System.out.println("START " + clusterName + " at "
        + new Date(System.currentTimeMillis()));


    HelixDataAccessor accessor =
        new ZKHelixDataAccessor(clusterName, new ZkBaseDataAccessor(_gZkClient));
    HelixManager manager = new DummyClusterManager(clusterName, accessor);
    ClusterEvent event = new ClusterEvent("testEvent");
    event.addAttribute("helixmanager", manager);


    final String resourceName = "testResource_xfer";
    String[] resourceGroups = new String[] { resourceName };

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    private final AtomicBoolean _done = new AtomicBoolean(false);


    @Override
    public void doTransition(Message message, NotificationContext context)
    {
      HelixManager manager = context.getManager();
      HelixDataAccessor accessor = manager.getHelixDataAccessor();
      Builder keyBuilder = accessor.keyBuilder();
      
      String instance = message.getTgtName();
      if (_done.getAndSet(true) == false)
      {

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      _alertValue = value;
    }
    @Override
    public void doTransition(Message message, NotificationContext context)
    {
      HelixManager manager = context.getManager();
      HelixDataAccessor accessor = manager.getHelixDataAccessor();
      String fromState = message.getFromState();
      String toState = message.getToState();
      String instance = message.getTgtName();
      String partition = message.getPartitionName();

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public class TestJosqlProcessor extends ZkStandAloneCMTestBase
{
  @Test (groups = {"integrationTest"})
  public void testJosqlQuery() throws Exception
  {
    HelixManager manager = ((TestHelper.StartCMResult) (_startCMResultMap.values().toArray()[0]))._manager;
    
    // Find the instance name that contains partition TestDB_2 and state is 'MASTER'
    String SQL = "SELECT id  " + 
        "FROM LIVEINSTANCES " + 
        "WHERE getMapFieldValue( getZNRecordFromMap(:IDEALSTATES , 'TestDB'), :partitionName, :_currObj.id)='MASTER'";

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  }
  
  @Test (groups=("unitTest"))
  public void testOrderby() throws Exception
  {
    HelixManager manager = ((TestHelper.StartCMResult) (_startCMResultMap.values().toArray()[0]))._manager;
    
    Map<String, ZNRecord> scnMap = new HashMap<String, ZNRecord>();
    for(int i = 0;i < NODE_NR; i++)
    {
      String instance = "localhost_"+(12918+i);

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      _alertValue = value;
    }
    @Override
    public void doTransition(Message message, NotificationContext context)
    {
      HelixManager manager = context.getManager();
      HelixDataAccessor accessor = manager.getHelixDataAccessor();
      String fromState = message.getFromState();
      String toState = message.getToState();
      String instance = message.getTgtName();
      String partition = message.getPartitionName();

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