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}