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;
027
028public 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}