001 /** 002 * Copyright (c) 2010 Yahoo! Inc. All rights reserved. 003 * Licensed under the Apache License, Version 2.0 (the "License"); 004 * you may not use this file except in compliance with the License. 005 * You may obtain a copy of the License at 006 * 007 * http://www.apache.org/licenses/LICENSE-2.0 008 * 009 * Unless required by applicable law or agreed to in writing, software 010 * distributed under the License is distributed on an "AS IS" BASIS, 011 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 * See the License for the specific language governing permissions and 013 * limitations under the License. See accompanying LICENSE file. 014 */ 015 package org.apache.oozie.action.hadoop; 016 017 import java.io.IOException; 018 019 import org.apache.hadoop.mapred.JobClient; 020 import org.apache.hadoop.mapred.JobConf; 021 import org.apache.hadoop.util.ReflectionUtils; 022 import org.apache.oozie.service.HadoopAccessorService; 023 import org.apache.oozie.service.Services; 024 025 //TODO this class can go away once we use only 20.100+ 026 public class AuthHelper { 027 private static Class<? extends AuthHelper> KLASS = null; 028 029 @SuppressWarnings("unchecked") 030 public synchronized static AuthHelper get() { 031 if (KLASS == null) { 032 HadoopAccessorService has = Services.get().get(HadoopAccessorService.class); 033 if (has.getClass() == HadoopAccessorService.class) { 034 KLASS = AuthHelper.class; 035 } 036 else { 037 try { 038 KLASS = (Class<? extends AuthHelper>) Class 039 .forName("org.apache.oozie.action.hadoop.KerberosAuthHelper"); 040 } 041 catch (ClassNotFoundException e) { 042 throw new RuntimeException(e); 043 } 044 } 045 } 046 return ReflectionUtils.newInstance(KLASS, null); 047 } 048 049 public void set(JobClient jobClient, JobConf jobConf) throws IOException, InterruptedException { 050 } 051 052 }