| /* |
| * 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.coprocessor; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.classification.InterfaceStability; |
| import org.apache.hadoop.hbase.Coprocessor; |
| import org.apache.hadoop.hbase.HBaseInterfaceAudience; |
| |
| import com.google.protobuf.Message; |
| import com.google.protobuf.Service; |
| |
| /** |
| * Coprocessors implement this interface to observe and mediate endpoint invocations |
| * on a region. |
| */ |
| @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC) |
| @InterfaceStability.Evolving |
| public interface EndpointObserver extends Coprocessor { |
| |
| /** |
| * Called before an Endpoint service method is invoked. |
| * The request message can be altered by returning a new instance. Throwing an |
| * exception will abort the invocation. |
| * Calling {@link org.apache.hadoop.hbase.coprocessor.ObserverContext#bypass()} has no |
| * effect in this hook. |
| * @param ctx the environment provided by the region server |
| * @param service the endpoint service |
| * @param methodName the invoked service method |
| * @param request the request message |
| * @return the possibly modified message |
| * @throws IOException |
| */ |
| Message preEndpointInvocation(ObserverContext<RegionCoprocessorEnvironment> ctx, Service service, |
| String methodName, Message request) throws IOException; |
| |
| /** |
| * Called after an Endpoint service method is invoked. The response message can be |
| * altered using the builder. |
| * @param ctx the environment provided by the region server |
| * @param service the endpoint service |
| * @param methodName the invoked service method |
| * @param request the request message |
| * @param responseBuilder the response message builder |
| * @throws IOException |
| */ |
| void postEndpointInvocation(ObserverContext<RegionCoprocessorEnvironment> ctx, Service service, |
| String methodName, Message request, Message.Builder responseBuilder) throws IOException; |
| |
| } |