| /** |
| * 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; |
| |
| /** |
| * Represents a directive from the {@link org.apache.hadoop.mapred.JobTracker} |
| * to the {@link org.apache.hadoop.mapred.TaskTracker} to launch a new task. |
| * |
| */ |
| class LaunchTaskAction extends TaskTrackerAction { |
| private Task task; |
| |
| public LaunchTaskAction() { |
| super(ActionType.LAUNCH_TASK); |
| } |
| |
| public LaunchTaskAction(Task task) { |
| super(ActionType.LAUNCH_TASK); |
| this.task = task; |
| } |
| |
| public Task getTask() { |
| return task; |
| } |
| |
| public void write(DataOutput out) throws IOException { |
| out.writeBoolean(task.isMapTask()); |
| task.write(out); |
| } |
| |
| public void readFields(DataInput in) throws IOException { |
| boolean isMapTask = in.readBoolean(); |
| if (isMapTask) { |
| task = new MapTask(); |
| } else { |
| task = new ReduceTask(); |
| } |
| task.readFields(in); |
| } |
| |
| } |