engine/src/main/java/com/datatorrent/stram/api/NodeActivationListener.java

/**
 * 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 com.datatorrent.stram.api;

import com.datatorrent.stram.engine.Node;

/**
 * When the node active state changes, listeners are notified of the changes.
 *
 * @since 0.3.5
 */
public interface NodeActivationListener
{
  /**
   * Callback to notify the listner that the node has been activated.
   *
   * @param node node which got activated.
   */
  void activated(Node<?> node);

  /**
   * Callback to notify the listner that the node has been activated.
   *
   * @param node node which got deactivated.
   */
  void deactivated(Node<?> node);

}