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.oozie.action.decision; 020 021import org.apache.oozie.client.WorkflowAction; 022import org.apache.oozie.action.ActionExecutor; 023import org.apache.oozie.action.ActionExecutorException; 024import org.apache.oozie.util.XLog; 025import org.apache.oozie.util.XmlUtils; 026import org.jdom.Element; 027import org.jdom.JDOMException; 028import org.jdom.Namespace; 029 030import java.util.List; 031 032public class DecisionActionExecutor extends ActionExecutor { 033 public static final String ACTION_TYPE = "switch"; 034 035 private static final String TRUE = "true"; 036 037 public static final String XML_ERROR = "XML_ERROR"; 038 039 public DecisionActionExecutor() { 040 super(ACTION_TYPE); 041 } 042 043 @SuppressWarnings("unchecked") 044 public void start(Context context, WorkflowAction action) throws ActionExecutorException { 045 XLog log = XLog.getLog(getClass()); 046 log.trace("start() begins"); 047 try { 048 String confStr = action.getConf(); 049 context.setStartData("-", "-", "-"); 050 Element conf = XmlUtils.parseXml(confStr); 051 Namespace ns = conf.getNamespace(); 052 053 String externalState = null; 054 055 for (Element eval : (List<Element>) conf.getChildren("case", ns)) { 056 if (TRUE.equals(eval.getTextTrim())) { 057 externalState = eval.getAttributeValue("to"); 058 break; 059 } 060 } 061 if (externalState == null) { 062 Element def = conf.getChild("default", ns); 063 if (def != null) { 064 externalState = def.getAttributeValue("to"); 065 } 066 } 067 068 if (externalState == null) { 069 throw new IllegalStateException("Transition cannot be NULL"); 070 } 071 // for decision we are piggybacking on external status to transfer the transition, 072 // the {@link ActionEndCommand} does the special handling of setting it as signal value. 073 context.setExecutionData(externalState, null); 074 } 075 catch (JDOMException ex) { 076 throw new ActionExecutorException(ActionExecutorException.ErrorType.FAILED, XML_ERROR, ex.getMessage(), ex); 077 } 078 finally { 079 log.trace("start() ends"); 080 } 081 } 082 083 public void end(Context context, WorkflowAction action) throws ActionExecutorException { 084 context.setEndData(WorkflowAction.Status.OK, action.getExternalStatus()); 085 } 086 087 public void check(Context context, WorkflowAction action) throws ActionExecutorException { 088 throw new UnsupportedOperationException(); 089 } 090 091 public void kill(Context context, WorkflowAction action) throws ActionExecutorException { 092 throw new UnsupportedOperationException(); 093 } 094 095 public boolean isCompleted(String externalStatus) { 096 return true; 097 } 098 099}