1 /* 2 * 3 * Copyright 2015 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 19 #import "GRXWriter.h" 20 21 /** 22 * A "proxy" class that simply forwards values, completion, and errors from its input writer to its 23 * writeable. 24 * It is useful as a superclass for pipes that act as a transformation of their 25 * input writer, and for classes that represent objects with input and 26 * output sequences of values, like an RPC. 27 * 28 * Thread-safety: 29 * All messages sent to this object need to be serialized. When it is started, the writer it wraps 30 * is started in the same thread. Manual state changes are propagated to the wrapped writer in the 31 * same thread too. Importantly, all messages the wrapped writer sends to its writeable need to be 32 * serialized with any message sent to this object. 33 */ 34 @interface GRXForwardingWriter : GRXWriter 35 - (instancetype)initWithWriter:(GRXWriter *)writer NS_DESIGNATED_INITIALIZER; 36 @end 37