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PartitionStatsRequest 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.partition.PartitionStats;
23  
24  import java.io.DataInput;
25  import java.io.DataOutput;
26  import java.io.IOException;
27  import java.util.ArrayList;
28  import java.util.Collection;
29  import java.util.List;
30  
31  /**
32   * Request for sending partition stats from workers to master
33   */
34  public class PartitionStatsRequest extends WritableRequest
35      implements MasterRequest {
36    /** Partition stats */
37    private List<PartitionStats> partitionStats;
38  
39    /**
40     * Constructor
41     *
42     * @param partitionStats Partition stats to send
43     */
44    public PartitionStatsRequest(Collection<PartitionStats> partitionStats) {
45      this.partitionStats = new ArrayList<>(partitionStats);
46    }
47  
48    /** Constructor for reflection */
49    public PartitionStatsRequest() {
50    }
51  
52    @Override
53    public void doRequest(MasterGlobalCommHandler commHandler) {
54      commHandler.receivedPartitionStats(partitionStats);
55    }
56  
57    @Override
58    public RequestType getType() {
59      return RequestType.PARTITION_STATS_REQUEST;
60    }
61  
62    @Override
63    void writeRequest(DataOutput output) throws IOException {
64      output.writeInt(partitionStats.size());
65      for (PartitionStats partitionStat : partitionStats) {
66        partitionStat.write(output);
67      }
68    }
69  
70    @Override
71    void readFieldsRequest(DataInput input) throws IOException {
72      int size = input.readInt();
73      partitionStats = new ArrayList<>(size);
74      for (int i = 0; i < size; i++) {
75        PartitionStats newPartitionStats = new PartitionStats();
76        newPartitionStats.readFields(input);
77        partitionStats.add(newPartitionStats);
78      }
79    }
80  }