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DefaultMasterObserver 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.master;
20  
21  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
22  import org.apache.giraph.metrics.AggregatedMetrics;
23  import org.apache.giraph.partition.PartitionStats;
24  
25  import java.util.List;
26  
27  /**
28   * A no-op implementation of MasterObserver to make it easier for users.
29   */
30  public class DefaultMasterObserver implements MasterObserver {
31    /** Configuration to use */
32    private ImmutableClassesGiraphConfiguration conf;
33  
34    @Override
35    public void setConf(ImmutableClassesGiraphConfiguration configuration) {
36      this.conf = configuration;
37    }
38  
39    @Override
40    public ImmutableClassesGiraphConfiguration getConf() {
41      return conf;
42    }
43  
44    @Override
45    public void preApplication() { }
46  
47    @Override
48    public void postApplication() { }
49  
50    @Override
51    public void applicationFailed(Exception e) { }
52  
53    @Override
54    public void preSuperstep(long superstep) { }
55  
56    @Override
57    public void postSuperstep(long superstep) { }
58  
59    @Override
60    public void superstepMetricsUpdate(long superstep,
61        AggregatedMetrics aggregatedMetrics,
62        List<PartitionStats> partitionStatsList) { }
63  }