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 */ 018 019 package org.apache.hadoop.yarn.state; 020 021 import org.apache.hadoop.classification.InterfaceAudience.Public; 022 import org.apache.hadoop.classification.InterfaceStability.Evolving; 023 024 @Public 025 @Evolving 026 public interface StateMachine 027 <STATE extends Enum<STATE>, 028 EVENTTYPE extends Enum<EVENTTYPE>, EVENT> { 029 public STATE getCurrentState(); 030 public STATE doTransition(EVENTTYPE eventType, EVENT event) 031 throws InvalidStateTransitonException; 032 }