1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.mapred; |
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20 | |
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21 | import java.io.DataInput; |
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22 | import java.io.DataOutput; |
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23 | import java.io.IOException; |
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24 | import org.apache.hadoop.io.Writable; |
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25 | |
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26 | class JvmTask implements Writable { |
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27 | Task t; |
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28 | boolean shouldDie; |
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29 | public JvmTask(Task t, boolean shouldDie) { |
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30 | this.t = t; |
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31 | this.shouldDie = shouldDie; |
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32 | } |
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33 | public JvmTask() {} |
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34 | public Task getTask() { |
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35 | return t; |
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36 | } |
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37 | public boolean shouldDie() { |
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38 | return shouldDie; |
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39 | } |
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40 | public void write(DataOutput out) throws IOException { |
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41 | out.writeBoolean(shouldDie); |
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42 | if (t != null) { |
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43 | out.writeBoolean(true); |
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44 | out.writeBoolean(t.isMapTask()); |
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45 | t.write(out); |
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46 | } else { |
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47 | out.writeBoolean(false); |
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48 | } |
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49 | } |
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50 | public void readFields(DataInput in) throws IOException { |
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51 | shouldDie = in.readBoolean(); |
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52 | boolean taskComing = in.readBoolean(); |
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53 | if (taskComing) { |
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54 | boolean isMap = in.readBoolean(); |
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55 | if (isMap) { |
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56 | t = new MapTask(); |
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57 | } else { |
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58 | t = new ReduceTask(); |
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59 | } |
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60 | t.readFields(in); |
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61 | } |
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62 | } |
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63 | } |
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