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    
019    package org.apache.hadoop.security;
020    
021    import java.io.IOException;
022    import java.util.List;
023    
024    import org.apache.commons.logging.Log;
025    import org.apache.commons.logging.LogFactory;
026    import org.apache.hadoop.util.NativeCodeLoader;
027    
028    public class JniBasedUnixGroupsNetgroupMappingWithFallback implements
029        GroupMappingServiceProvider {
030    
031      private static final Log LOG = LogFactory
032          .getLog(JniBasedUnixGroupsNetgroupMappingWithFallback.class);
033    
034      private GroupMappingServiceProvider impl;
035    
036      public JniBasedUnixGroupsNetgroupMappingWithFallback() {
037        if (NativeCodeLoader.isNativeCodeLoaded()) {
038          this.impl = new JniBasedUnixGroupsNetgroupMapping();
039        } else {
040          LOG.info("Falling back to shell based");
041          this.impl = new ShellBasedUnixGroupsNetgroupMapping();
042        }
043        if (LOG.isDebugEnabled()) {
044          LOG.debug("Group mapping impl=" + impl.getClass().getName());
045        }
046      }
047    
048      @Override
049      public List<String> getGroups(String user) throws IOException {
050        return impl.getGroups(user);
051      }
052    
053      @Override
054      public void cacheGroupsRefresh() throws IOException {
055        impl.cacheGroupsRefresh();
056      }
057    
058      @Override
059      public void cacheGroupsAdd(List<String> groups) throws IOException {
060        impl.cacheGroupsAdd(groups);
061      }
062    
063    }