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.netty; 18 19 import io.grpc.Internal; 20 import io.netty.channel.ChannelHandler; 21 import io.netty.util.AsciiString; 22 23 /** 24 * A class that provides a Netty handler to control protocol negotiation. 25 */ 26 @Internal 27 public interface ProtocolNegotiator { 28 29 /** 30 * The Netty handler to control the protocol negotiation. 31 */ 32 interface Handler extends ChannelHandler { 33 /** 34 * The HTTP/2 scheme to be used when sending {@code HEADERS}. 35 */ scheme()36 AsciiString scheme(); 37 } 38 39 /** 40 * Creates a new handler to control the protocol negotiation. Once the negotiation has completed 41 * successfully, the provided handler is installed. Must call {@code 42 * grpcHandler.onHandleProtocolNegotiationCompleted()} at certain point if the negotiation has 43 * completed successfully. 44 */ newHandler(GrpcHttp2ConnectionHandler grpcHandler)45 Handler newHandler(GrpcHttp2ConnectionHandler grpcHandler); 46 } 47