/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.falcon.service;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.Groups;
import java.io.IOException;
import java.util.List;
/**
* The GroupsService class delegates to the Hadoop's <code>org.apache.hadoop.security.Groups</code>
* to retrieve the groups a user belongs to.
*/
public class GroupsService implements FalconService {
private org.apache.hadoop.security.Groups hGroups;
public static final String SERVICE_NAME = GroupsService.class.getSimpleName();
/**
* Initializes the service.
*/
@Override
public void init() {
hGroups = new Groups(new Configuration(true));
}
/**
* Destroys the service.
*/
@Override
public void destroy() {
}
@Override
public String getName() {
return SERVICE_NAME;
}
/**
* Returns the list of groups a user belongs to.
*
* @param user user name.
* @return the groups the given user belongs to.
* @throws java.io.IOException thrown if there was an error retrieving the groups of the user.
*/
public List<String> getGroups(String user) throws IOException {
return hGroups.getGroups(user);
}
}