/**
 * 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;


class MapTaskStatus extends TaskStatus {

  public MapTaskStatus() {}

  public MapTaskStatus(TaskAttemptID taskid, float progress, int numSlots,
          State runState, String diagnosticInfo, String stateString,
          String taskTracker, Phase phase, Counters counters) {
    super(taskid, progress, numSlots, runState, diagnosticInfo, stateString,
          taskTracker, phase, counters);
  }

  @Override
  public boolean getIsMap() {
    return true;
  }

  @Override
  public long getShuffleFinishTime() {
    throw new UnsupportedOperationException("getShuffleFinishTime() not supported for MapTask");
  }

  @Override
  void setShuffleFinishTime(long shuffleFinishTime) {
    throw new UnsupportedOperationException("setShuffleFinishTime() not supported for MapTask");
  }

  @Override
  public long getSortFinishTime() {
    throw new UnsupportedOperationException("getSortFinishTime() not supported for MapTask");
  }

  @Override
  void setSortFinishTime(long sortFinishTime) {
    throw new UnsupportedOperationException("setSortFinishTime() not supported for MapTask");
  }
  
  /**
   * Helper function that calculate the rate, given the total so far and the 
   * current time
   * @param cumulative
   * @param currentTime
   * @return
   */
  private double calculateRate(long cumulative, long currentTime) {
    long timeSinceMapStart = 0;
    assert getPhase() == Phase.MAP : "MapTaskStatus not in map phase!";

    long startTime = getStartTime();
    timeSinceMapStart = currentTime - startTime;
    if (timeSinceMapStart <= 0) {
      LOG.error("Current time is " + currentTime + 
          " but start time is " + startTime);
      return 0;
    }
    
    return cumulative/timeSinceMapStart; 
  }
  
  /**
   * Returns processing rate in bytes/ms
   */
  @Override
  public double getMapByteProcessingRate(long currentTime) {
    @SuppressWarnings("deprecation")
    long bytesProcessed = super.getCounters().findCounter
        (Task.Counter.MAP_INPUT_BYTES).getCounter();
    return calculateRate(bytesProcessed, currentTime);
  }
  
  /**
   * Returns processing rate in records/ms
   */
  @Override
  public double getMapRecordProcessingRate(long currentTime) {
    @SuppressWarnings("deprecation")
    long bytesProcessed = super.getCounters().findCounter
        (Task.Counter.MAP_INPUT_RECORDS).getCounter();
    return calculateRate(bytesProcessed, currentTime);
  }
}