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AskForInputSplitRequest xref
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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.giraph.comm.requests;
20  
21  import org.apache.giraph.master.MasterGlobalCommHandler;
22  import org.apache.giraph.io.InputType;
23  
24  import java.io.DataInput;
25  import java.io.DataOutput;
26  import java.io.IOException;
27  
28  /**
29   * A request which workers will send to master to ask it to give them splits
30   */
31  public class AskForInputSplitRequest extends WritableRequest
32      implements MasterRequest {
33    /** Type of split we are requesting */
34    private InputType splitType;
35    /** Task id of worker which requested the split */
36    private int workerTaskId;
37    /**
38     * Whether this is the first split a thread is requesting,
39     * or this request indicates that previously requested input split was done
40     */
41    private boolean isFirstSplit;
42  
43    /**
44     * Constructor
45     *
46     * @param splitType Type of split we are requesting
47     * @param workerTaskId Task id of worker which requested the split
48     * @param isFirstSplit Whether this is the first split a thread is requesting,
49     *   or this request indicates that previously requested input split was done
50     */
51    public AskForInputSplitRequest(InputType splitType, int workerTaskId,
52        boolean isFirstSplit) {
53      this.splitType = splitType;
54      this.workerTaskId = workerTaskId;
55      this.isFirstSplit = isFirstSplit;
56    }
57  
58    /**
59     * Constructor used for reflection only
60     */
61    public AskForInputSplitRequest() {
62    }
63  
64    @Override
65    public void doRequest(MasterGlobalCommHandler commHandler) {
66      commHandler.getInputSplitsHandler().sendSplitTo(
67          splitType, workerTaskId, isFirstSplit);
68    }
69  
70    @Override
71    void readFieldsRequest(DataInput in) throws IOException {
72      splitType = InputType.values()[in.readInt()];
73      workerTaskId = in.readInt();
74      isFirstSplit = in.readBoolean();
75    }
76  
77    @Override
78    void writeRequest(DataOutput out) throws IOException {
79      out.writeInt(splitType.ordinal());
80      out.writeInt(workerTaskId);
81      out.writeBoolean(isFirstSplit);
82    }
83  
84    @Override
85    public RequestType getType() {
86      return RequestType.ASK_FOR_INPUT_SPLIT_REQUEST;
87    }
88  }