1 /* 2 * Copyright 2018 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 import com.google.common.base.MoreObjects; 20 21 /** 22 * A {@link ClientCall.Listener} which forwards all of its methods to another {@link 23 * ClientCall.Listener} which may have a different parameterized type than the 24 * onMessage() message type. 25 */ 26 abstract class PartialForwardingClientCallListener<RespT> extends ClientCall.Listener<RespT> { 27 /** 28 * Returns the delegated {@code ClientCall.Listener}. 29 */ delegate()30 protected abstract ClientCall.Listener<?> delegate(); 31 32 @Override onHeaders(Metadata headers)33 public void onHeaders(Metadata headers) { 34 delegate().onHeaders(headers); 35 } 36 37 @Override onClose(Status status, Metadata trailers)38 public void onClose(Status status, Metadata trailers) { 39 delegate().onClose(status, trailers); 40 } 41 42 @Override onReady()43 public void onReady() { 44 delegate().onReady(); 45 } 46 47 @Override toString()48 public String toString() { 49 return MoreObjects.toStringHelper(this).add("delegate", delegate()).toString(); 50 } 51 } 52