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    package org.apache.oozie.action.control;
019    
020    import org.apache.oozie.action.ActionExecutor;
021    import org.apache.oozie.action.ActionExecutorException;
022    import org.apache.oozie.action.hadoop.FsActionExecutor;
023    import org.apache.oozie.client.WorkflowAction;
024    import org.apache.oozie.util.XLog;
025    import org.apache.oozie.util.XmlUtils;
026    import org.apache.oozie.workflow.lite.ControlNodeHandler;
027    import org.jdom.Element;
028    import org.jdom.JDOMException;
029    import org.jdom.Namespace;
030    
031    import java.util.List;
032    
033    /**
034     * Base action executor for control nodes: START/END/KILL/FORK/JOIN
035     * <p/>
036     * This action executor, similar to {@link FsActionExecutor}, is completed during the
037     * {@link #start(Context, WorkflowAction)}.
038     * <p/>
039     * By hooking control nodes to an action executor, control nodes get WF action entries in the DB.
040     */
041    public abstract class ControlNodeActionExecutor extends ActionExecutor {
042    
043        public ControlNodeActionExecutor(String type) {
044            super(type);
045        }
046    
047        @SuppressWarnings("unchecked")
048        public void start(Context context, WorkflowAction action) throws ActionExecutorException {
049            context.setStartData("-", "-", "-");
050            context.setExecutionData("OK", null);
051        }
052    
053        public void end(Context context, WorkflowAction action) throws ActionExecutorException {
054            context.setEndData(WorkflowAction.Status.OK, getActionSignal(WorkflowAction.Status.OK));
055        }
056    
057        public void check(Context context, WorkflowAction action) throws ActionExecutorException {
058            throw new UnsupportedOperationException();
059        }
060    
061        public void kill(Context context, WorkflowAction action) throws ActionExecutorException {
062            throw new UnsupportedOperationException();
063        }
064    
065        public boolean isCompleted(String externalStatus) {
066            return true;
067        }
068    
069    }