| /* |
| * 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.client; |
| |
| import com.google.protobuf.Descriptors; |
| import com.google.protobuf.Message; |
| import com.google.protobuf.RpcCallback; |
| import com.google.protobuf.RpcController; |
| import com.google.protobuf.ServiceException; |
| |
| import java.io.IOException; |
| |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.hbase.ipc.CoprocessorRpcChannel; |
| import org.apache.hadoop.hbase.ipc.CoprocessorRpcUtils; |
| |
| /** |
| * Base class which provides clients with an RPC connection to |
| * call coprocessor endpoint {@link com.google.protobuf.Service}s. |
| * Note that clients should not use this class directly, except through |
| * {@link org.apache.hadoop.hbase.client.Table#coprocessorService(byte[])}. |
| * @deprecated Please stop using this class again, as it is too low level, which is part of the rpc |
| * framework for HBase. Will be deleted in 4.0.0. |
| */ |
| @Deprecated |
| @InterfaceAudience.Public |
| abstract class SyncCoprocessorRpcChannel implements CoprocessorRpcChannel { |
| private static final Logger LOG = LoggerFactory.getLogger(SyncCoprocessorRpcChannel.class); |
| |
| @Override |
| @InterfaceAudience.Private |
| public void callMethod(Descriptors.MethodDescriptor method, |
| RpcController controller, |
| Message request, Message responsePrototype, |
| RpcCallback<Message> callback) { |
| Message response = null; |
| try { |
| response = callExecService(controller, method, request, responsePrototype); |
| } catch (IOException ioe) { |
| LOG.warn("Call failed on IOException", ioe); |
| CoprocessorRpcUtils.setControllerException(controller, ioe); |
| } |
| if (callback != null) { |
| callback.run(response); |
| } |
| } |
| |
| @Override |
| @InterfaceAudience.Private |
| public Message callBlockingMethod(Descriptors.MethodDescriptor method, |
| RpcController controller, |
| Message request, Message responsePrototype) |
| throws ServiceException { |
| try { |
| return callExecService(controller, method, request, responsePrototype); |
| } catch (IOException ioe) { |
| throw new ServiceException("Error calling method "+method.getFullName(), ioe); |
| } |
| } |
| |
| protected abstract Message callExecService(RpcController controller, |
| Descriptors.MethodDescriptor method, Message request, Message responsePrototype) |
| throws IOException; |
| } |