/**
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.tools.rumen.JobStoryProducer;
import org.apache.hadoop.mapred.gridmix.Statistics.JobStats;
import org.apache.hadoop.mapred.gridmix.Statistics.ClusterStats;

import java.util.concurrent.CountDownLatch;
import java.io.IOException;
import org.apache.hadoop.util.StringUtils;

enum GridmixJobSubmissionPolicy {

  REPLAY("REPLAY", 320000) {
    @Override
    public JobFactory<ClusterStats> createJobFactory(
      JobSubmitter submitter, JobStoryProducer producer, Path scratchDir,
      Configuration conf, CountDownLatch startFlag, UserResolver userResolver)
      throws IOException {
      return new ReplayJobFactory(
        submitter, producer, scratchDir, conf, startFlag, userResolver);
    }
  },

  STRESS("STRESS", 5000) {
    @Override
    public JobFactory<ClusterStats> createJobFactory(
      JobSubmitter submitter, JobStoryProducer producer, Path scratchDir,
      Configuration conf, CountDownLatch startFlag, UserResolver userResolver)
      throws IOException {
      return new StressJobFactory(
        submitter, producer, scratchDir, conf, startFlag, userResolver);
    }
  },

  SERIAL("SERIAL", 0) {
    @Override
    public JobFactory<JobStats> createJobFactory(
      JobSubmitter submitter, JobStoryProducer producer, Path scratchDir,
      Configuration conf, CountDownLatch startFlag, UserResolver userResolver)
      throws IOException {
      return new SerialJobFactory(
        submitter, producer, scratchDir, conf, startFlag, userResolver);
    }
  };

  public static final String JOB_SUBMISSION_POLICY =
    "gridmix.job-submission.policy";

  private final String name;
  private final int pollingInterval;

  GridmixJobSubmissionPolicy(String name, int pollingInterval) {
    this.name = name;
    this.pollingInterval = pollingInterval;
  }

  public abstract JobFactory createJobFactory(
    JobSubmitter submitter, JobStoryProducer producer, Path scratchDir,
    Configuration conf, CountDownLatch startFlag, UserResolver userResolver)
    throws IOException;

  public int getPollingInterval() {
    return pollingInterval;
  }

  public static GridmixJobSubmissionPolicy getPolicy(
    Configuration conf, GridmixJobSubmissionPolicy defaultPolicy) {
    String policy = conf.get(JOB_SUBMISSION_POLICY, defaultPolicy.name());
    return valueOf(StringUtils.toUpperCase(policy));
  }
}