/**
 * 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.hcatalog.templeton;

import java.io.IOException;
import java.util.List;
import java.util.ArrayList;

import org.apache.hadoop.mapred.JobStatus;
import org.apache.hadoop.mapred.JobTracker;
import org.apache.hadoop.mapred.TempletonJobTracker;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hcatalog.templeton.tool.JobState;

/**
 * List jobs owned by a user.
 */
public class ListDelegator extends TempletonDelegator {
    public ListDelegator(AppConfig appConf) {
        super(appConf);
    }

    public List<String> run(String user)
        throws NotAuthorizedException, BadParam, IOException {
        UserGroupInformation ugi = UserGroupInformation.createRemoteUser(user);
        TempletonJobTracker tracker = null;
        try {
            tracker = new TempletonJobTracker(ugi,
                JobTracker.getAddress(appConf),
                appConf);

            ArrayList<String> ids = new ArrayList<String>();

            JobStatus[] jobs = tracker.getAllJobs();

            if (jobs != null) {
                for (JobStatus job : jobs) {
                    JobState state = null;
                    try {
                        String id = job.getJobID().toString();
                        state = new JobState(id, Main.getAppConfigInstance());
                        if (user.equals(state.getUser()))
                            ids.add(id);
                    } finally {
                        if (state != null) {
                            state.close();
                        }
                    }
                }
            }

            return ids;
        } catch (IllegalStateException e) {
            throw new BadParam(e.getMessage());
        } finally {
            if (tracker != null)
                tracker.close();
        }
    }
}