| /** |
| * 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.RpcCallback; |
| import com.google.protobuf.RpcController; |
| |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * Delegate to a protobuf rpc call. |
| * <p> |
| * Usually, it is just a simple lambda expression, like: |
| * |
| * <pre> |
| * <code> |
| * (stub, controller, rpcCallback) -> { |
| * XXXRequest request = ...; // prepare the request |
| * stub.xxx(controller, request, rpcCallback); |
| * } |
| * </code> |
| * </pre> |
| * |
| * And if already have the {@code request}, the lambda expression will be: |
| * |
| * <pre> |
| * <code> |
| * (stub, controller, rpcCallback) -> stub.xxx(controller, request, rpcCallback) |
| * </code> |
| * </pre> |
| * |
| * @param <S> the type of the protobuf Service you want to call. |
| * @param <R> the type of the return value. |
| */ |
| @InterfaceAudience.Public |
| @FunctionalInterface |
| public interface ServiceCaller<S, R> { |
| |
| /** |
| * Represent the actual protobuf rpc call. |
| * @param stub the asynchronous stub |
| * @param controller the rpc controller, has already been prepared for you |
| * @param rpcCallback the rpc callback, has already been prepared for you |
| */ |
| void call(S stub, RpcController controller, RpcCallback<R> rpcCallback); |
| } |