package org.apache.helix.manager.zk;
   
   /*
    * 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.Arrays;
  
  import org.apache.helix.HelixException;
  import org.apache.helix.HelixManager;
  import org.apache.helix.NotificationContext;
  import org.apache.helix.messaging.handling.HelixTaskResult;
  import org.apache.helix.messaging.handling.MessageHandler;
  import org.apache.helix.messaging.handling.MessageHandlerFactory;
  import org.apache.helix.model.Message;
  import org.apache.log4j.Logger;
  
  
  /**
   * DefaultParticipantErrorMessageHandlerFactory works on controller side.
   * When the participant detects a critical error, it will send the PARTICIPANT_ERROR_REPORT
   * Message to the controller, specifying whether it want to disable the instance or
   * disable the partition. The controller have a chance to do whatever make sense at that point,
   * and then disable the corresponding partition or the instance. More configs per resource will
   * be added to customize the controller behavior.
   * */
  public class DefaultParticipantErrorMessageHandlerFactory implements
    MessageHandlerFactory
  {
    public enum ActionOnError
    {
      DISABLE_PARTITION, DISABLE_RESOURCE, DISABLE_INSTANCE
    }
  
    public static final String ACTIONKEY = "ActionOnError";
  
    private static Logger _logger = Logger
      .getLogger(DefaultParticipantErrorMessageHandlerFactory.class);
    final HelixManager _manager;
  
    public DefaultParticipantErrorMessageHandlerFactory(HelixManager manager)
    {
      _manager = manager;
    }
  
    public static class DefaultParticipantErrorMessageHandler extends MessageHandler
    {
      final HelixManager _manager;
      public DefaultParticipantErrorMessageHandler(Message message,
          NotificationContext context,  HelixManager manager)
      {
         super(message, context);
         _manager = manager;
      }
  
      @Override
      public HelixTaskResult handleMessage() throws InterruptedException
      {
        HelixTaskResult result = new HelixTaskResult();
        result.setSuccess(true);
        // TODO : consider unify this with StatsAggregationStage.executeAlertActions()
        try
        {
          ActionOnError actionOnError
            = ActionOnError.valueOf(_message.getRecord().getSimpleField(ACTIONKEY));
  
          if(actionOnError == ActionOnError.DISABLE_INSTANCE)
          {
            _manager.getClusterManagmentTool().enableInstance(_manager.getClusterName(), _message.getMsgSrc(), false);
            _logger.info("Instance " + _message.getMsgSrc() + " disabled");
          }
          else if(actionOnError == ActionOnError.DISABLE_PARTITION)
          {
            _manager.getClusterManagmentTool().enablePartition(false, _manager.getClusterName(), _message.getMsgSrc(),
                _message.getResourceName(), Arrays.asList( _message.getPartitionName()));
            _logger.info("partition " + _message.getPartitionName() + " disabled");
          }
          else if (actionOnError == ActionOnError.DISABLE_RESOURCE)
          {
            // NOT IMPLEMENTED, or we can disable all partitions
            //_manager.getClusterManagmentTool().en(_manager.getClusterName(), _manager.getInstanceName(),
            //    _message.getResourceName(), _message.getPartitionName(), false);
            _logger.info("resource " + _message.getResourceName() + " disabled");
          }
       }
       catch(Exception e)
       {
         _logger.error("", e);
         result.setSuccess(false);
         result.setException(e);
       }
       return result;
     }
 
     @Override
     public void onError(Exception e, ErrorCode code, ErrorType type)
     {
       _logger.error("Message handling pipeline get an exception. MsgId:"
           + _message.getMsgId(), e);
     }
 
   }
 
   @Override
   public MessageHandler createHandler(Message message,
       NotificationContext context)
   {
     String type = message.getMsgType();
 
     if(!type.equals(getMessageType()))
     {
       throw new HelixException("Unexpected msg type for message "+message.getMsgId()
           +" type:" + message.getMsgType());
     }
 
     return new DefaultParticipantErrorMessageHandler(message, context, _manager);
   }
 
   @Override
   public String getMessageType()
   {
     return Message.MessageType.PARTICIPANT_ERROR_REPORT.toString();
   }
 
   @Override
   public void reset()
   {
 
   }
 
 }