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.hadoop.security;
020
021import java.io.IOException;
022import java.util.List;
023
024import org.apache.commons.logging.Log;
025import org.apache.commons.logging.LogFactory;
026import org.apache.hadoop.util.NativeCodeLoader;
027import org.apache.hadoop.util.PerformanceAdvisory;
028
029public class JniBasedUnixGroupsMappingWithFallback implements
030    GroupMappingServiceProvider {
031
032  private static final Log LOG = LogFactory
033      .getLog(JniBasedUnixGroupsMappingWithFallback.class);
034  
035  private GroupMappingServiceProvider impl;
036
037  public JniBasedUnixGroupsMappingWithFallback() {
038    if (NativeCodeLoader.isNativeCodeLoaded()) {
039      this.impl = new JniBasedUnixGroupsMapping();
040    } else {
041      PerformanceAdvisory.LOG.debug("Falling back to shell based");
042      this.impl = new ShellBasedUnixGroupsMapping();
043    }
044    if (LOG.isDebugEnabled()){
045      LOG.debug("Group mapping impl=" + impl.getClass().getName());
046    }
047  }
048
049  @Override
050  public List<String> getGroups(String user) throws IOException {
051    return impl.getGroups(user);
052  }
053
054  @Override
055  public void cacheGroupsRefresh() throws IOException {
056    impl.cacheGroupsRefresh();
057  }
058
059  @Override
060  public void cacheGroupsAdd(List<String> groups) throws IOException {
061    impl.cacheGroupsAdd(groups);
062  }
063
064}