3 * Copyright 2015 gRPC authors.
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
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #ifndef GRPCPP_IMPL_CODEGEN_ASYNC_GENERIC_SERVICE_H
20 #define GRPCPP_IMPL_CODEGEN_ASYNC_GENERIC_SERVICE_H
22 // IWYU pragma: private, include <grpcpp/generic/async_generic_service.h>
24 #include <grpc/impl/codegen/port_platform.h>
26 #include <grpcpp/impl/codegen/async_stream.h>
27 #include <grpcpp/impl/codegen/byte_buffer.h>
28 #include <grpcpp/impl/codegen/server_callback.h>
29 #include <grpcpp/impl/codegen/server_callback_handlers.h>
35 typedef ServerAsyncReaderWriter<ByteBuffer, ByteBuffer>
36 GenericServerAsyncReaderWriter;
37 typedef ServerAsyncResponseWriter<ByteBuffer> GenericServerAsyncResponseWriter;
38 typedef ServerAsyncReader<ByteBuffer, ByteBuffer> GenericServerAsyncReader;
39 typedef ServerAsyncWriter<ByteBuffer> GenericServerAsyncWriter;
41 class GenericServerContext final : public ServerContext {
43 const std::string& method() const { return method_; }
44 const std::string& host() const { return host_; }
47 friend class ServerInterface;
53 // A generic service at the server side accepts all RPC methods and hosts. It is
54 // typically used in proxies. The generic service can be registered to a server
55 // which also has other services.
57 // ServerBuilder builder;
58 // auto cq = builder.AddCompletionQueue();
59 // AsyncGenericService generic_service;
60 // builder.RegisterAsyncGenericService(&generic_service);
61 // auto server = builder.BuildAndStart();
63 // // request a new call
64 // GenericServerContext context;
65 // GenericServerAsyncReaderWriter stream;
66 // generic_service.RequestCall(&context, &stream, cq.get(), cq.get(), tag);
68 // When tag is retrieved from cq->Next(), context.method() can be used to look
69 // at the method and the RPC can be handled accordingly.
70 class AsyncGenericService final {
72 AsyncGenericService() : server_(nullptr) {}
74 void RequestCall(GenericServerContext* ctx,
75 GenericServerAsyncReaderWriter* reader_writer,
76 ::grpc::CompletionQueue* call_cq,
77 ::grpc::ServerCompletionQueue* notification_cq, void* tag);
80 friend class grpc::Server;
81 grpc::Server* server_;
84 /// \a ServerGenericBidiReactor is the reactor class for bidi streaming RPCs
85 /// invoked on a CallbackGenericService. It is just a ServerBidi reactor with
86 /// ByteBuffer arguments.
87 using ServerGenericBidiReactor = ServerBidiReactor<ByteBuffer, ByteBuffer>;
89 class GenericCallbackServerContext final : public grpc::CallbackServerContext {
91 const std::string& method() const { return method_; }
92 const std::string& host() const { return host_; }
95 friend class ::grpc::Server;
101 /// \a CallbackGenericService is the base class for generic services implemented
102 /// using the callback API and registered through the ServerBuilder using
103 /// RegisterCallbackGenericService.
104 class CallbackGenericService {
106 CallbackGenericService() {}
107 virtual ~CallbackGenericService() {}
109 /// The "method handler" for the generic API. This function should be
110 /// overridden to provide a ServerGenericBidiReactor that implements the
111 /// application-level interface for this RPC. Unimplemented by default.
112 virtual ServerGenericBidiReactor* CreateReactor(
113 GenericCallbackServerContext* /*ctx*/) {
114 class Reactor : public ServerGenericBidiReactor {
116 Reactor() { this->Finish(Status(StatusCode::UNIMPLEMENTED, "")); }
117 void OnDone() override { delete this; }
123 friend class grpc::Server;
125 internal::CallbackBidiHandler<ByteBuffer, ByteBuffer>* Handler() {
126 return new internal::CallbackBidiHandler<ByteBuffer, ByteBuffer>(
127 [this](::grpc::CallbackServerContext* ctx) {
128 return CreateReactor(static_cast<GenericCallbackServerContext*>(ctx));
132 grpc::Server* server_{nullptr};
137 #endif // GRPCPP_IMPL_CODEGEN_ASYNC_GENERIC_SERVICE_H