content: 
  /*
   * 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.
   */
  package org.apache.asterix.active;
  
  import java.util.Collection;
  
  import org.apache.asterix.active.message.ActivePartitionMessage;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  
  /**
   * Represents the notification handler for events of active entity jobs
   */
  public interface IActiveNotificationHandler {
  
      /**
       * Recover all active jobs that failed
       */
      void recover();
  
      /**
       * Register a listener for events of an active entity
       *
       * @param listener
       *            the listener to register
       * @throws HyracksDataException
       *             if the active entity already has a listener associated with it
       */
      void registerListener(IActiveEntityEventsListener listener) throws HyracksDataException;
  
      /**
       * Unregister a listener for events of an active entity
       *
       * @param listener
       *            the listener to unregister
       * @throws HyracksDataException
       *             if the entity is still active or if the listener was not registered
       */
      void unregisterListener(IActiveEntityEventsListener listener) throws HyracksDataException;
  
      /**
       * @return List of all the registered event listeners
       */
      Collection<IActiveEntityEventsListener> getEventListenersAsList();
  
      /**
       * @return all the registered event listeners
       */
      IActiveEntityEventsListener[] getEventListeners();
  
      /**
       * Lookup an event listener using the entity id
       *
       * @param entityId
       *            the lookup key
       * @return the registered listener if found, null otherwise
       */
      IActiveEntityEventsListener getListener(EntityId entityId);
  
      /**
       * Recieves an active job message from an nc
       *
       * @param message
       *            the message
       */
      void receive(ActivePartitionMessage message);
  
  }
  