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 019package org.apache.oozie.service; 020 021import java.io.IOException; 022import java.util.concurrent.ConcurrentHashMap; 023import java.util.concurrent.ConcurrentMap; 024import org.apache.hadoop.fs.FileSystem; 025 026import org.apache.hadoop.security.UserGroupInformation; 027import org.apache.oozie.util.XLog; 028 029public class UserGroupInformationService implements Service { 030 031 private ConcurrentMap<String, UserGroupInformation> cache = new ConcurrentHashMap<String, UserGroupInformation>(); 032 033 @Override 034 public void init(Services services) throws ServiceException { 035 } 036 037 @Override 038 public void destroy() { 039 for (UserGroupInformation ugi : cache.values()) { 040 try { 041 FileSystem.closeAllForUGI(ugi); 042 } catch(IOException ioe) { 043 XLog.getLog(this.getClass()).warn("Exception occurred while closing filesystems for " + ugi.getUserName(), ioe); 044 } 045 } 046 cache.clear(); 047 } 048 049 @Override 050 public Class<? extends Service> getInterface() { 051 return UserGroupInformationService.class; 052 } 053 054 public UserGroupInformation getProxyUser(String user) throws IOException { 055 cache.putIfAbsent(user, UserGroupInformation.createProxyUser(user, UserGroupInformation.getLoginUser())); 056 return cache.get(user); 057 } 058 059}