001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.hbase.client.coprocessor;
020
021import java.io.IOException;
022
023import org.apache.yetus.audience.InterfaceAudience;
024import org.apache.yetus.audience.InterfaceStability;
025import org.apache.hadoop.hbase.HBaseInterfaceAudience;
026import org.apache.hadoop.hbase.protobuf.generated.RowProcessorProtos.ProcessRequest;
027import org.apache.hadoop.hbase.regionserver.RowProcessor;
028
029import com.google.protobuf.Message;
030/**
031 * Convenience class that is used to make RowProcessorEndpoint invocations.
032 * For example usage, refer TestRowProcessorEndpoint
033 *
034 */
035@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
036@InterfaceStability.Evolving
037public class RowProcessorClient {
038  public static <S extends Message, T extends Message>
039  ProcessRequest getRowProcessorPB(RowProcessor<S,T> r)
040      throws IOException {
041    final ProcessRequest.Builder requestBuilder =
042        ProcessRequest.newBuilder();
043    requestBuilder.setRowProcessorClassName(r.getClass().getName());
044    S s = r.getRequestData();
045    if (s != null) {
046      requestBuilder.setRowProcessorInitializerMessageName(s.getClass().getName());
047      requestBuilder.setRowProcessorInitializerMessage(s.toByteString());
048    }
049    return requestBuilder.build();
050  }
051}