This project has retired. For details please refer to its Attic page.
BlockMasterCompute xref
View Javadoc

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  package org.apache.giraph.block_app.framework.api.giraph;
19  
20  import java.io.DataInput;
21  import java.io.DataOutput;
22  import java.io.IOException;
23  
24  import org.apache.giraph.block_app.framework.internal.BlockMasterLogic;
25  import org.apache.giraph.block_app.framework.internal.BlockWorkerPieces;
26  import org.apache.giraph.block_app.framework.output.BlockOutputHandle;
27  import org.apache.giraph.master.MasterCompute;
28  import org.apache.giraph.writable.kryo.KryoWritableWrapper;
29  
30  /**
31   * MasterCompute class which executes block computation.
32   *
33   * @param <S> Execution stage type
34   */
35  public final class BlockMasterCompute<S> extends MasterCompute {
36    private BlockMasterLogic<S> blockMasterLogic = new BlockMasterLogic<>();
37  
38    @Override
39    public void initialize() throws InstantiationException,
40        IllegalAccessException {
41      blockMasterLogic.initialize(getConf(), new BlockMasterApiWrapper(this,
42          new BlockOutputHandle(getContext().getJobID().toString(),
43          getConf(), getContext())));
44    }
45  
46    @Override
47    public void compute() {
48      BlockWorkerPieces<S> workerPieces =
49          blockMasterLogic.computeNext(getSuperstep());
50      if (workerPieces == null) {
51        haltComputation();
52      } else {
53        BlockWorkerPieces.setNextWorkerPieces(this, workerPieces);
54      }
55    }
56  
57    @Override
58    public void write(DataOutput out) throws IOException {
59      new KryoWritableWrapper<>(blockMasterLogic).write(out);
60    }
61  
62    @Override
63    public void readFields(DataInput in) throws IOException {
64      KryoWritableWrapper<BlockMasterLogic<S>> object =
65          new KryoWritableWrapper<>();
66      object.readFields(in);
67      blockMasterLogic = object.get();
68      blockMasterLogic.initializeAfterRead(new BlockMasterApiWrapper(this,
69          new BlockOutputHandle()));
70    }
71  }