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 */
018package org.apache.oozie.action.control;
019
020import org.apache.oozie.action.ActionExecutor;
021import org.apache.oozie.action.ActionExecutorException;
022import org.apache.oozie.action.hadoop.FsActionExecutor;
023import org.apache.oozie.client.WorkflowAction;
024import org.apache.oozie.util.XLog;
025import org.apache.oozie.util.XmlUtils;
026import org.apache.oozie.workflow.lite.ControlNodeHandler;
027import org.jdom.Element;
028import org.jdom.JDOMException;
029import org.jdom.Namespace;
030
031import 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 */
041public 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}