| /** |
| * 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.oozie.action.decision; |
| |
| import org.apache.oozie.client.WorkflowAction; |
| import org.apache.oozie.action.ActionExecutor; |
| import org.apache.oozie.action.ActionExecutorException; |
| import org.apache.oozie.util.XLog; |
| import org.apache.oozie.util.XmlUtils; |
| import org.jdom.Element; |
| import org.jdom.JDOMException; |
| import org.jdom.Namespace; |
| |
| import java.util.List; |
| |
| public class DecisionActionExecutor extends ActionExecutor { |
| public static final String ACTION_TYPE = "switch"; |
| |
| private static final String TRUE = "true"; |
| |
| public static final String XML_ERROR = "XML_ERROR"; |
| |
| private final XLog LOG = XLog.getLog(getClass()); |
| |
| public DecisionActionExecutor() { |
| super(ACTION_TYPE); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public void start(Context context, WorkflowAction action) throws ActionExecutorException { |
| LOG.info("Starting action"); |
| try { |
| String confStr = action.getConf(); |
| context.setStartData("-", "-", "-"); |
| Element conf = XmlUtils.parseXml(confStr); |
| Namespace ns = conf.getNamespace(); |
| |
| String externalState = null; |
| |
| for (Element eval : (List<Element>) conf.getChildren("case", ns)) { |
| if (TRUE.equals(eval.getTextTrim())) { |
| externalState = eval.getAttributeValue("to"); |
| break; |
| } |
| } |
| if (externalState == null) { |
| Element def = conf.getChild("default", ns); |
| if (def != null) { |
| externalState = def.getAttributeValue("to"); |
| } |
| } |
| |
| if (externalState == null) { |
| throw new IllegalStateException("Transition cannot be NULL"); |
| } |
| // for decision we are piggybacking on external status to transfer the transition, |
| // the {@link ActionEndCommand} does the special handling of setting it as signal value. |
| context.setExecutionData(externalState, null); |
| } |
| catch (JDOMException ex) { |
| throw new ActionExecutorException(ActionExecutorException.ErrorType.FAILED, XML_ERROR, ex.getMessage(), ex); |
| } |
| } |
| |
| public void end(Context context, WorkflowAction action) throws ActionExecutorException { |
| context.setEndData(WorkflowAction.Status.OK, action.getExternalStatus()); |
| LOG.info("Action ended with external status [{0}]", action.getExternalStatus()); |
| } |
| |
| public void check(Context context, WorkflowAction action) throws ActionExecutorException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void kill(Context context, WorkflowAction action) throws ActionExecutorException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean isCompleted(String externalStatus) { |
| return true; |
| } |
| |
| } |