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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  package org.apache.hadoop.hbase.regionserver;
19  
20  import java.io.IOException;
21  import java.util.ArrayList;
22  import java.util.List;
23  import java.util.UUID;
24  
25  import org.apache.hadoop.classification.InterfaceAudience;
26  import org.apache.hadoop.classification.InterfaceStability;
27  import org.apache.hadoop.hbase.HBaseInterfaceAudience;
28  import org.apache.hadoop.hbase.client.Durability;
29  import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
30  
31  import com.google.protobuf.Message;
32  
33  /**
34   * Base class for RowProcessor with some default implementations.
35   */
36  @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
37  @InterfaceStability.Evolving
38  public abstract class BaseRowProcessor<S extends Message,T extends Message> 
39  implements RowProcessor<S,T> {
40  
41    @Override
42    public void preProcess(HRegion region, WALEdit walEdit) throws IOException {
43    }
44  
45    @Override
46    public void preBatchMutate(HRegion region, WALEdit walEdit) throws IOException {
47    }
48  
49    @Override
50    public void postBatchMutate(HRegion region) throws IOException {
51    }
52  
53    @Override
54    public void postProcess(HRegion region, WALEdit walEdit, boolean success) throws IOException {
55    }
56  
57    @Override
58    public List<UUID> getClusterIds() {
59      return new ArrayList<UUID>();
60    }
61  
62    @Override
63    public String getName() {
64      return this.getClass().getSimpleName().toLowerCase();
65    }
66  
67    @Override
68    public Durability useDurability() {
69      return Durability.USE_DEFAULT;
70    }
71  }