001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  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.apache.hadoop.yarn.state;
020
021import org.apache.hadoop.classification.InterfaceAudience.Public;
022import org.apache.hadoop.classification.InterfaceStability.Evolving;
023import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
024
025/**
026 * The exception that happens when you call invalid state transition.
027 *
028 */
029@Public
030@Evolving
031public class InvalidStateTransitionException extends YarnRuntimeException {
032
033  private static final long serialVersionUID = -6188669113571351684L;
034  private Enum<?> currentState;
035  private Enum<?> event;
036
037  public InvalidStateTransitionException(Enum<?> currentState, Enum<?> event) {
038    super("Invalid event: " + event + " at " + currentState);
039    this.currentState = currentState;
040    this.event = event;
041  }
042
043  public Enum<?> getCurrentState() {
044    return currentState;
045  }
046
047  public Enum<?> getEvent() {
048    return event;
049  }
050
051}