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.service; 019 020import java.io.IOException; 021import java.util.concurrent.ConcurrentHashMap; 022import java.util.concurrent.ConcurrentMap; 023import org.apache.hadoop.fs.FileSystem; 024 025import org.apache.hadoop.security.UserGroupInformation; 026import org.apache.oozie.util.XLog; 027 028public class UserGroupInformationService implements Service { 029 030 private ConcurrentMap<String, UserGroupInformation> cache = new ConcurrentHashMap<String, UserGroupInformation>(); 031 032 @Override 033 public void init(Services services) throws ServiceException { 034 } 035 036 @Override 037 public void destroy() { 038 for (UserGroupInformation ugi : cache.values()) { 039 try { 040 FileSystem.closeAllForUGI(ugi); 041 } catch(IOException ioe) { 042 XLog.getLog(this.getClass()).warn("Exception occurred while closing filesystems for " + ugi.getUserName(), ioe); 043 } 044 } 045 cache.clear(); 046 } 047 048 @Override 049 public Class<? extends Service> getInterface() { 050 return UserGroupInformationService.class; 051 } 052 053 public UserGroupInformation getProxyUser(String user) throws IOException { 054 cache.putIfAbsent(user, UserGroupInformation.createProxyUser(user, UserGroupInformation.getLoginUser())); 055 return cache.get(user); 056 } 057 058}