001 /** 002 * Copyright (c) 2010 Yahoo! Inc. All rights reserved. 003 * Licensed under the Apache License, Version 2.0 (the "License"); 004 * you may not use this file except in compliance with the License. 005 * You may obtain a copy of the License at 006 * 007 * http://www.apache.org/licenses/LICENSE-2.0 008 * 009 * Unless required by applicable law or agreed to in writing, software 010 * distributed under the License is distributed on an "AS IS" BASIS, 011 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 * See the License for the specific language governing permissions and 013 * limitations under the License. See accompanying LICENSE file. 014 */ 015 package org.apache.oozie.command; 016 017 import org.apache.oozie.ErrorCode; 018 import org.apache.oozie.client.Job; 019 020 /** 021 * Transition command for unpause the job. The derived class has to override these following functions: 022 * <p/> 023 * updateJob() : update job status and attributes 024 * unpauseChildren() : submit or queue commands to unpause children 025 * notifyParent() : update the status to upstream if any 026 * 027 * @param <T> 028 */ 029 public abstract class UnpauseTransitionXCommand extends TransitionXCommand<Void> { 030 /** 031 * The constructor for abstract class {@link UnpauseTransitionXCommand} 032 * 033 * @param name the command name 034 * @param type the command type 035 * @param priority the command priority 036 */ 037 public UnpauseTransitionXCommand(String name, String type, int priority) { 038 super(name, type, priority); 039 } 040 041 /** 042 * Unpause actions associated with the job 043 * 044 * @throws CommandException thrown if failed to unpause actions 045 */ 046 public abstract void unpauseChildren() throws CommandException; 047 048 /* (non-Javadoc) 049 * @see org.apache.oozie.command.TransitionXCommand#transitToNext() 050 */ 051 @Override 052 public final void transitToNext() throws CommandException { 053 if (job == null) { 054 job = this.getJob(); 055 } 056 057 if (job.getStatus() == Job.Status.PAUSED) { 058 job.setStatus(Job.Status.RUNNING); 059 } 060 else if (job.getStatus() == Job.Status.PAUSEDWITHERROR) { 061 job.setStatus(Job.Status.RUNNINGWITHERROR); 062 } 063 else if (job.getStatus() == Job.Status.PREPPAUSED) { 064 job.setStatus(Job.Status.PREP); 065 } 066 else { 067 throw new CommandException(ErrorCode.E1316, job.getId()); 068 } 069 070 //TODO: to be revisited; 071 //job.setPending(); 072 } 073 074 /* (non-Javadoc) 075 * @see org.apache.oozie.command.TransitionXCommand#execute() 076 */ 077 @Override 078 protected Void execute() throws CommandException { 079 try { 080 transitToNext(); 081 updateJob(); 082 unpauseChildren(); 083 } 084 finally { 085 notifyParent(); 086 } 087 return null; 088 } 089 }