001/*
002 * JPPF.
003 * Copyright (C) 2005-2018 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.utils.stats;
020
021import java.util.EventListener;
022
023/**
024 * Listener interface for JPPF statistics.
025 * @author Laurent Cohen
026 */
027public interface JPPFStatisticsListener extends EventListener {
028  /**
029   * Called when a new snapshot is created.
030   * @param event the event encapsulating the {@link JPPFSnapshot} that was created and the {@link JPPFStatistics} it belongs to.
031   */
032  void snapshotAdded(JPPFStatisticsEvent event);
033
034  /**
035   * Called when a snapshot is removed.
036   * @param event the event encapsulating a {@link JPPFSnapshot} that was removed and the {@link JPPFStatistics} it belonged to.
037   */
038  void snapshotRemoved(JPPFStatisticsEvent event);
039
040  /**
041   * Called when a snapshot is updated.
042   * @param event the event encapsulating a {@link JPPFSnapshot} that was updated and the {@link JPPFStatistics} it belongs to.
043   */
044  void snapshotUpdated(JPPFStatisticsEvent event);
045}