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.hadoop;
019    
020    import java.util.concurrent.Callable;
021    
022    //TODO this class goes away when doing 20.100+ only
023    
024    //TODO this class is for testing, but is here to allow selective compilation
025    public class DoAs implements Callable<Void> {
026        private String user;
027        private Callable<Void> callable;
028    
029        public void setUser(String user) {
030            this.user = user;
031        }
032    
033        protected String getUser() {
034            return user;
035        }
036    
037        protected Callable<Void> getCallable() {
038            return callable;
039        }
040    
041        public void setCallable(Callable<Void> callable) {
042            this.callable = callable;
043        }
044    
045        public Void call() throws Exception {
046            callable.call();
047            return null;
048        }
049    
050        public static void call(String user, Callable<Void> callable) throws Exception {
051            Class klass;
052            try {
053                klass = Class.forName("org.apache.oozie.action.hadoop.KerberosDoAs");
054            }
055            catch (ClassNotFoundException ex) {
056                klass = DoAs.class;
057            }
058            DoAs doAs = (DoAs) klass.newInstance();
059            doAs.setCallable(new Callable<Void>() {
060                @Override
061                public Void call() throws Exception {
062                    PigMain.main(null);
063                    return null;
064                }
065            });
066            doAs.setUser(user);
067            doAs.setCallable(callable);
068            doAs.call();
069        }
070    
071    }