001/*
002 * JPPF.
003 * Copyright (C) 2005-2019 JPPF Team.
004 * http://www.jppf.org
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.jppf.node.event;
020
021import java.util.EventListener;
022
023/**
024 * Interface for all listeners to the node's life cycle events.
025 * @author Laurent Cohen
026 */
027public interface NodeLifeCycleListener extends EventListener {
028  /**
029   * Called when the node has finished initializing, and before it starts processing jobs.
030   * @param event encapsulates information about the node.
031   */
032  void nodeStarting(NodeLifeCycleEvent event);
033
034  /**
035   * Called when the node is terminating.
036   * @param event encapsulates information about the node.
037   */
038  void nodeEnding(NodeLifeCycleEvent event);
039
040  /**
041   * Called when the node has loaded a job header and before the {@code DataProvider} or any of the tasks have been loaded.
042   * <p>Note that {@code event.getTasks()} and {@code event.getDataProvider()} will return {@code null} at this point.
043   * @param event encapsulates information about the job.
044   */
045  void jobHeaderLoaded(NodeLifeCycleEvent event);
046
047  /**
048   * Called before the node starts processing a job.
049   * @param event encapsulates information about the job.
050   */
051  void jobStarting(NodeLifeCycleEvent event);
052
053  /**
054   * Called after the node finishes processing a job.
055   * @param event encapsulates information about the job.
056   */
057  void jobEnding(NodeLifeCycleEvent event);
058
059  /**
060   * Called <i>after</i> the node has sent the results of a job to the server, and <i>before</i> it receives the next job.
061   * It is guranteed that the node is idle when this method is called.
062   * <p>Note that {@code event.getJob()}, {@code event.getTasks()}, {@code event.getTaskClassLoader()} and {@code event.getDataProvider()} will return {@code null} at this point.
063   * @param event encapsulates information about the job.
064   */
065  void beforeNextJob(NodeLifeCycleEvent event);
066}