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.hadoop;
019
020import org.apache.hadoop.conf.Configuration;
021import org.apache.hadoop.fs.Path;
022import org.apache.oozie.action.ActionExecutorException;
023import org.apache.oozie.client.XOozieClient;
024import org.apache.oozie.client.WorkflowAction;
025import org.jdom.Element;
026import org.jdom.Namespace;
027import org.jdom.JDOMException;
028import org.json.simple.parser.JSONParser;
029
030import java.util.ArrayList;
031import java.util.List;
032
033public class PigActionExecutor extends ScriptLanguageActionExecutor {
034
035    private static final String PIG_MAIN_CLASS_NAME = "org.apache.oozie.action.hadoop.PigMain";
036    static final String PIG_SCRIPT = "oozie.pig.script";
037    static final String PIG_PARAMS = "oozie.pig.params";
038    static final String PIG_ARGS = "oozie.pig.args";
039
040    public PigActionExecutor() {
041        super("pig");
042    }
043
044    @SuppressWarnings("rawtypes")
045    @Override
046    public List<Class> getLauncherClasses() {
047        List<Class> classes = new ArrayList<Class>();
048        try {
049            classes.add(Class.forName(PIG_MAIN_CLASS_NAME));
050            classes.add(JSONParser.class);
051        }
052        catch (ClassNotFoundException e) {
053            throw new RuntimeException("Class not found", e);
054        }
055        return classes;
056    }
057
058
059    @Override
060    protected String getLauncherMain(Configuration launcherConf, Element actionXml) {
061        return launcherConf.get(LauncherMapper.CONF_OOZIE_ACTION_MAIN_CLASS, PIG_MAIN_CLASS_NAME);
062    }
063
064    @Override
065    void injectActionCallback(Context context, Configuration launcherConf) {
066    }
067
068    @Override
069    @SuppressWarnings("unchecked")
070    Configuration setupActionConf(Configuration actionConf, Context context, Element actionXml, Path appPath)
071            throws ActionExecutorException {
072        super.setupActionConf(actionConf, context, actionXml, appPath);
073        Namespace ns = actionXml.getNamespace();
074
075        String script = actionXml.getChild("script", ns).getTextTrim();
076        String pigName = new Path(script).getName();
077
078        List<Element> params = (List<Element>) actionXml.getChildren("param", ns);
079        String[] strParams = new String[params.size()];
080        for (int i = 0; i < params.size(); i++) {
081            strParams[i] = params.get(i).getTextTrim();
082        }
083        String[] strArgs = null;
084        List<Element> eArgs = actionXml.getChildren("argument", ns);
085        if (eArgs != null && eArgs.size() > 0) {
086            strArgs = new String[eArgs.size()];
087            for (int i = 0; i < eArgs.size(); i++) {
088                strArgs[i] = eArgs.get(i).getTextTrim();
089            }
090        }
091        setPigScript(actionConf, pigName, strParams, strArgs);
092        return actionConf;
093    }
094
095    public static void setPigScript(Configuration conf, String script, String[] params, String[] args) {
096        conf.set(PIG_SCRIPT, script);
097        MapReduceMain.setStrings(conf, PIG_PARAMS, params);
098        MapReduceMain.setStrings(conf, PIG_ARGS, args);
099    }
100
101
102    @Override
103    protected boolean getCaptureOutput(WorkflowAction action) throws JDOMException {
104        return false;
105    }
106
107    /**
108     * Return the sharelib postfix for the action.
109     *
110     * @return returns <code>pig</code>.
111     * @param actionXml
112     */
113    @Override
114    protected String getDefaultShareLibName(Element actionXml) {
115        return "pig";
116    }
117
118    protected String getScriptName() {
119        return XOozieClient.PIG_SCRIPT;
120    }
121
122}