1 /* 2 * Copyright 2015 The gRPC Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.grpc; 18 19 /** 20 * A {@link ServerCall} which forwards all of its methods to another {@link ServerCall}. 21 */ 22 public abstract class ForwardingServerCall<ReqT, RespT> 23 extends PartialForwardingServerCall<ReqT, RespT> { 24 /** 25 * Returns the delegated {@code ServerCall}. 26 */ 27 @Override delegate()28 protected abstract ServerCall<ReqT, RespT> delegate(); 29 30 @Override sendMessage(RespT message)31 public void sendMessage(RespT message) { 32 delegate().sendMessage(message); 33 } 34 35 @Override getMethodDescriptor()36 public MethodDescriptor<ReqT, RespT> getMethodDescriptor() { 37 return delegate().getMethodDescriptor(); 38 } 39 40 /** 41 * A simplified version of {@link ForwardingServerCall} where subclasses can pass in a {@link 42 * ServerCall} as the delegate. 43 */ 44 public abstract static class SimpleForwardingServerCall<ReqT, RespT> 45 extends ForwardingServerCall<ReqT, RespT> { 46 47 private final ServerCall<ReqT, RespT> delegate; 48 SimpleForwardingServerCall(ServerCall<ReqT, RespT> delegate)49 protected SimpleForwardingServerCall(ServerCall<ReqT, RespT> delegate) { 50 this.delegate = delegate; 51 } 52 53 @Override delegate()54 protected ServerCall<ReqT, RespT> delegate() { 55 return delegate; 56 } 57 } 58 } 59