| /** |
| * 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.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.Writable; |
| |
| /** |
| * Task abstraction that can be serialized, implements the writable interface. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class JvmTask implements Writable { |
| Task t; |
| boolean shouldDie; |
| public JvmTask(Task t, boolean shouldDie) { |
| this.t = t; |
| this.shouldDie = shouldDie; |
| } |
| public JvmTask() {} |
| public Task getTask() { |
| return t; |
| } |
| public boolean shouldDie() { |
| return shouldDie; |
| } |
| public void write(DataOutput out) throws IOException { |
| out.writeBoolean(shouldDie); |
| if (t != null) { |
| out.writeBoolean(true); |
| out.writeBoolean(t.isMapTask()); |
| t.write(out); |
| } else { |
| out.writeBoolean(false); |
| } |
| } |
| public void readFields(DataInput in) throws IOException { |
| shouldDie = in.readBoolean(); |
| boolean taskComing = in.readBoolean(); |
| if (taskComing) { |
| boolean isMap = in.readBoolean(); |
| if (isMap) { |
| t = new MapTask(); |
| } else { |
| t = new ReduceTask(); |
| } |
| t.readFields(in); |
| } |
| } |
| } |