org.apache.hadoop.hbase.ipc.CoprocessorRpcChannel Maven / Gradle / Ivy
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* 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 com.google.protobuf.BlockingRpcChannel;
import com.google.protobuf.Descriptors;
import com.google.protobuf.Message;
import com.google.protobuf.RpcCallback;
import com.google.protobuf.RpcChannel;
import com.google.protobuf.RpcController;
import com.google.protobuf.Service;
import com.google.protobuf.ServiceException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.protobuf.ResponseConverter;
import java.io.IOException;
/**
* Base class which provides clients with an RPC connection to
* call coprocessor endpoint {@link Service}s
*/
@InterfaceAudience.Private
public abstract class CoprocessorRpcChannel implements RpcChannel, BlockingRpcChannel {
private static Log LOG = LogFactory.getLog(CoprocessorRpcChannel.class);
@Override
public void callMethod(Descriptors.MethodDescriptor method,
RpcController controller,
Message request, Message responsePrototype,
RpcCallback callback) {
Message response = null;
try {
response = callExecService(method, request, responsePrototype);
} catch (IOException ioe) {
LOG.warn("Call failed on IOException", ioe);
ResponseConverter.setControllerException(controller, ioe);
}
if (callback != null) {
callback.run(response);
}
}
@Override
public Message callBlockingMethod(Descriptors.MethodDescriptor method,
RpcController controller,
Message request, Message responsePrototype)
throws ServiceException {
try {
return callExecService(method, request, responsePrototype);
} catch (IOException ioe) {
throw new ServiceException("Error calling method "+method.getFullName(), ioe);
}
}
protected abstract Message callExecService(Descriptors.MethodDescriptor method,
Message request, Message responsePrototype) throws IOException;
}