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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.hadoop.hbase.client.coprocessor;
20  
21  import java.io.IOException;
22  
23  import org.apache.hadoop.classification.InterfaceAudience;
24  import org.apache.hadoop.classification.InterfaceStability;
25  import org.apache.hadoop.hbase.HBaseInterfaceAudience;
26  import org.apache.hadoop.hbase.protobuf.generated.RowProcessorProtos.ProcessRequest;
27  import org.apache.hadoop.hbase.regionserver.RowProcessor;
28  
29  import com.google.protobuf.Message;
30  /**
31   * Convenience class that is used to make RowProcessorEndpoint invocations.
32   * For example usage, refer TestRowProcessorEndpoint
33   *
34   */
35  @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
36  @InterfaceStability.Evolving
37  public class RowProcessorClient {
38    public static <S extends Message, T extends Message>
39    ProcessRequest getRowProcessorPB(RowProcessor<S,T> r)
40        throws IOException {
41      final ProcessRequest.Builder requestBuilder =
42          ProcessRequest.newBuilder();
43      requestBuilder.setRowProcessorClassName(r.getClass().getName());
44      S s = r.getRequestData();
45      if (s != null) {
46        requestBuilder.setRowProcessorInitializerMessageName(s.getClass().getName());
47        requestBuilder.setRowProcessorInitializerMessage(s.toByteString());
48      }
49      return requestBuilder.build();
50    }
51  }