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/**
 * 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.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.apache.hadoop.io.Writable;


/**
 * Represents a directive from the {@link org.apache.hadoop.mapred.JobTracker} 
 * to the {@link org.apache.hadoop.mapred.TaskTracker} to kill a task.
 * 
 */
class KillTaskAction extends TaskTrackerAction {
  final TaskAttemptID taskId;
  
  public KillTaskAction() {
    super(ActionType.KILL_TASK);
    taskId = new TaskAttemptID();
  }
  
  public KillTaskAction(TaskAttemptID taskId) {
    super(ActionType.KILL_TASK);
    this.taskId = taskId;
  }

  public KillTaskAction(TaskAttemptID taskId, Writable extensible) {
    super(ActionType.KILL_TASK, extensible);
    this.taskId = taskId;
  }

  public TaskAttemptID getTaskID() {
    return taskId;
  }
  
  @Override
  public void write(DataOutput out) throws IOException {
    super.write(out);
    taskId.write(out);
  }

  @Override
  public void readFields(DataInput in) throws IOException {
    super.readFields(in);
    taskId.readFields(in);
  }
}