| /* |
| * 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 org.apache.tez.state; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.hadoop.yarn.state.InvalidStateTransitonException; |
| import org.apache.hadoop.yarn.state.StateMachine; |
| import org.apache.tez.dag.records.TezID; |
| |
| public class StateMachineTez<STATE extends Enum<STATE>, EVENTTYPE extends Enum<EVENTTYPE>, EVENT, OPERAND> |
| implements StateMachine<STATE, EVENTTYPE, EVENT> { |
| |
| private final Map<STATE, OnStateChangedCallback> callbackMap = |
| new HashMap<STATE, OnStateChangedCallback>(); |
| private final OPERAND operand; |
| |
| private final StateMachine<STATE, EVENTTYPE, EVENT> realStatemachine; |
| |
| public StateMachineTez(StateMachine sm, OPERAND operand) { |
| this.realStatemachine = sm; |
| this.operand = operand; |
| } |
| |
| public StateMachineTez registerStateEnteredCallback(STATE state, |
| OnStateChangedCallback callback) { |
| callbackMap.put(state, callback); |
| return this; |
| } |
| |
| @Override |
| public STATE getCurrentState() { |
| return realStatemachine.getCurrentState(); |
| } |
| |
| @Override |
| public STATE doTransition(EVENTTYPE eventType, EVENT event) throws |
| InvalidStateTransitonException { |
| STATE oldState = realStatemachine.getCurrentState(); |
| STATE newState = realStatemachine.doTransition(eventType, event); |
| if (newState != oldState) { |
| OnStateChangedCallback callback = callbackMap.get(newState); |
| if (callback != null) { |
| callback.onStateChanged(operand, newState); |
| } |
| } |
| return newState; |
| } |
| } |