/**
 * 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;

import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.UserGroupInformation;

/*
 * Communicate with the JobTracker as a specific user.
 */
public class TempletonJobTracker {
    private JobSubmissionProtocol cnx;

    /**
     * Create a connection to the Job Tracker.
     */
    public TempletonJobTracker(UserGroupInformation ugi,
                               InetSocketAddress addr,
                               Configuration conf)
        throws IOException {
        cnx = (JobSubmissionProtocol)
            RPC.getProxy(JobSubmissionProtocol.class,
                JobSubmissionProtocol.versionID,
                addr,
                ugi,
                conf,
                NetUtils.getSocketFactory(conf,
                    JobSubmissionProtocol.class));
    }

    /**
     * Grab a handle to a job that is already known to the JobTracker.
     *
     * @return Profile of the job, or null if not found.
     */
    public JobProfile getJobProfile(JobID jobid)
        throws IOException {
        return cnx.getJobProfile(jobid);
    }

    /**
     * Grab a handle to a job that is already known to the JobTracker.
     *
     * @return Status of the job, or null if not found.
     */
    public JobStatus getJobStatus(JobID jobid)
        throws IOException {
        return cnx.getJobStatus(jobid);
    }


    /**
     * Kill a job.
     */
    public void killJob(JobID jobid)
        throws IOException {
        cnx.killJob(jobid);
    }

    /**
     * Get all the jobs submitted.
     */
    public JobStatus[] getAllJobs()
        throws IOException {
        return cnx.getAllJobs();
    }

    /**
     * Close the connection to the Job Tracker.
     */
    public void close() {
        RPC.stopProxy(cnx);
    }
}