/**
* 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.hadoop.mapred.gridmix;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.LineReader;
/**
* Maps users in the trace to a set of valid target users on the test cluster.
*/
public interface UserResolver {
/**
* Configure the user map given the URI and configuration. The resolver's
* contract will define how the resource will be interpreted, but the default
* will typically interpret the URI as a {@link org.apache.hadoop.fs.Path}
* listing target users.
* @param userdesc URI (possibly null) from which user information may be
* loaded per the subclass contract.
* @param conf The tool configuration.
* @return true if the resource provided was used in building the list of
* target users
*/
public boolean setTargetUsers(URI userdesc, Configuration conf)
throws IOException;
/**
* Map the given UGI to another per the subclass contract.
* @param ugi User information from the trace.
*/
public UserGroupInformation getTargetUgi(UserGroupInformation ugi);
}