/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License. You may obtain a
* copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable
* law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
* for the specific language governing permissions and limitations under the License.
*/
package org.apache.hadoop.hbase.ipc;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.ClusterConnection;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.CoprocessorServiceResponse;
import org.apache.hadoop.hbase.util.ByteStringer;
import com.google.protobuf.Descriptors;
import com.google.protobuf.Message;
/**
* Provides clients with an RPC connection to call coprocessor endpoint
* {@link com.google.protobuf.Service}s against a given region server. An instance of this class may
* be obtained by calling {@link org.apache.hadoop.hbase.client.HBaseAdmin#coprocessorService(ServerName)},
* but should normally only be used in creating a new {@link com.google.protobuf.Service} stub to
* call the endpoint methods.
* @see org.apache.hadoop.hbase.client.HBaseAdmin#coprocessorService(ServerName)
*/
@InterfaceAudience.Private
public class RegionServerCoprocessorRpcChannel extends CoprocessorRpcChannel {
private static Log LOG = LogFactory.getLog(RegionServerCoprocessorRpcChannel.class);
private final ClusterConnection connection;
private final ServerName serverName;
public RegionServerCoprocessorRpcChannel(ClusterConnection conn, ServerName serverName) {
this.connection = conn;
this.serverName = serverName;
}
@Override
protected Message callExecService(Descriptors.MethodDescriptor method, Message request,
Message responsePrototype) throws IOException {
if (LOG.isTraceEnabled()) {
LOG.trace("Call: " + method.getName() + ", " + request.toString());
}
final ClientProtos.CoprocessorServiceCall call =
ClientProtos.CoprocessorServiceCall.newBuilder()
.setRow(ByteStringer.wrap(HConstants.EMPTY_BYTE_ARRAY))
.setServiceName(method.getService().getFullName()).setMethodName(method.getName())
.setRequest(request.toByteString()).build();
CoprocessorServiceResponse result =
ProtobufUtil.execRegionServerService(connection.getClient(serverName), call);
Message response = null;
if (result.getValue().hasValue()) {
response =
responsePrototype.newBuilderForType().mergeFrom(result.getValue().getValue()).build();
} else {
response = responsePrototype.getDefaultInstanceForType();
}
if (LOG.isTraceEnabled()) {
LOG.trace("Result is value=" + response);
}
return response;
}
}