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 ClientCall} which forwards all of its methods to another {@link ClientCall}. 21 */ 22 public abstract class ForwardingClientCall<ReqT, RespT> 23 extends PartialForwardingClientCall<ReqT, RespT> { 24 /** 25 * Returns the delegated {@code ClientCall}. 26 */ 27 @Override delegate()28 protected abstract ClientCall<ReqT, RespT> delegate(); 29 30 @Override start(Listener<RespT> responseListener, Metadata headers)31 public void start(Listener<RespT> responseListener, Metadata headers) { 32 delegate().start(responseListener, headers); 33 } 34 35 @Override sendMessage(ReqT message)36 public void sendMessage(ReqT message) { 37 delegate().sendMessage(message); 38 } 39 40 /** 41 * A simplified version of {@link ForwardingClientCall} where subclasses can pass in a {@link 42 * ClientCall} as the delegate. 43 */ 44 public abstract static class SimpleForwardingClientCall<ReqT, RespT> 45 extends ForwardingClientCall<ReqT, RespT> { 46 private final ClientCall<ReqT, RespT> delegate; 47 SimpleForwardingClientCall(ClientCall<ReqT, RespT> delegate)48 protected SimpleForwardingClientCall(ClientCall<ReqT, RespT> delegate) { 49 this.delegate = delegate; 50 } 51 52 @Override delegate()53 protected ClientCall<ReqT, RespT> delegate() { 54 return delegate; 55 } 56 } 57 } 58