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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef GRPCPP_IMPL_CODEGEN_SERVICE_TYPE_H
#define GRPCPP_IMPL_CODEGEN_SERVICE_TYPE_H
#include <grpcpp/impl/codegen/config.h>
#include <grpcpp/impl/codegen/core_codegen_interface.h>
#include <grpcpp/impl/codegen/rpc_service_method.h>
#include <grpcpp/impl/codegen/serialization_traits.h>
#include <grpcpp/impl/codegen/server_interface.h>
#include <grpcpp/impl/codegen/status.h>
namespace grpc {
class CompletionQueue;
class Server;
class ServerInterface;
class ServerCompletionQueue;
class ServerContext;
namespace internal {
class Call;
class ServerAsyncStreamingInterface {
public:
virtual ~ServerAsyncStreamingInterface() {}
/// Request notification of the sending of initial metadata to the client.
/// Completion will be notified by \a tag on the associated completion
/// queue. This call is optional, but if it is used, it cannot be used
/// concurrently with or after the \a Finish method.
///
/// \param[in] tag Tag identifying this request.
virtual void SendInitialMetadata(void* tag) = 0;
private:
friend class ::grpc::ServerInterface;
virtual void BindCall(Call* call) = 0;
};
} // namespace internal
/// Desriptor of an RPC service and its various RPC methods
class Service {
public:
Service() : server_(nullptr) {}
virtual ~Service() {}
bool has_async_methods() const {
for (auto it = methods_.begin(); it != methods_.end(); ++it) {
if (*it && (*it)->handler() == nullptr) {
return true;
}
}
return false;
}
bool has_synchronous_methods() const {
for (auto it = methods_.begin(); it != methods_.end(); ++it) {
if (*it && (*it)->handler() != nullptr) {
return true;
}
}
return false;
}
bool has_generic_methods() const {
for (auto it = methods_.begin(); it != methods_.end(); ++it) {
if (it->get() == nullptr) {
return true;
}
}
return false;
}
protected:
template <class Message>
void RequestAsyncUnary(int index, ServerContext* context, Message* request,
internal::ServerAsyncStreamingInterface* stream,
CompletionQueue* call_cq,
ServerCompletionQueue* notification_cq, void* tag) {
// Typecast the index to size_t for indexing into a vector
// while preserving the API that existed before a compiler
// warning was first seen (grpc/grpc#11664)
size_t idx = static_cast<size_t>(index);
server_->RequestAsyncCall(methods_[idx].get(), context, stream, call_cq,
notification_cq, tag, request);
}
void RequestAsyncClientStreaming(
int index, ServerContext* context,
internal::ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq,
ServerCompletionQueue* notification_cq, void* tag) {
size_t idx = static_cast<size_t>(index);
server_->RequestAsyncCall(methods_[idx].get(), context, stream, call_cq,
notification_cq, tag);
}
template <class Message>
void RequestAsyncServerStreaming(
int index, ServerContext* context, Message* request,
internal::ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq,
ServerCompletionQueue* notification_cq, void* tag) {
size_t idx = static_cast<size_t>(index);
server_->RequestAsyncCall(methods_[idx].get(), context, stream, call_cq,
notification_cq, tag, request);
}
void RequestAsyncBidiStreaming(
int index, ServerContext* context,
internal::ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq,
ServerCompletionQueue* notification_cq, void* tag) {
size_t idx = static_cast<size_t>(index);
server_->RequestAsyncCall(methods_[idx].get(), context, stream, call_cq,
notification_cq, tag);
}
void AddMethod(internal::RpcServiceMethod* method) {
methods_.emplace_back(method);
}
void MarkMethodAsync(int index) {
// This does not have to be a hard error, however no one has approached us
// with a use case yet. Please file an issue if you believe you have one.
size_t idx = static_cast<size_t>(index);
GPR_CODEGEN_ASSERT(
methods_[idx].get() != nullptr &&
"Cannot mark the method as 'async' because it has already been "
"marked as 'generic'.");
methods_[idx]->SetServerAsyncType(
internal::RpcServiceMethod::AsyncType::ASYNC);
}
void MarkMethodRaw(int index) {
// This does not have to be a hard error, however no one has approached us
// with a use case yet. Please file an issue if you believe you have one.
size_t idx = static_cast<size_t>(index);
GPR_CODEGEN_ASSERT(methods_[idx].get() != nullptr &&
"Cannot mark the method as 'raw' because it has already "
"been marked as 'generic'.");
methods_[idx]->SetServerAsyncType(
internal::RpcServiceMethod::AsyncType::RAW);
}
void MarkMethodGeneric(int index) {
// This does not have to be a hard error, however no one has approached us
// with a use case yet. Please file an issue if you believe you have one.
size_t idx = static_cast<size_t>(index);
GPR_CODEGEN_ASSERT(
methods_[idx]->handler() != nullptr &&
"Cannot mark the method as 'generic' because it has already been "
"marked as 'async' or 'raw'.");
methods_[idx].reset();
}
void MarkMethodStreamed(int index, internal::MethodHandler* streamed_method) {
// This does not have to be a hard error, however no one has approached us
// with a use case yet. Please file an issue if you believe you have one.
size_t idx = static_cast<size_t>(index);
GPR_CODEGEN_ASSERT(methods_[idx] && methods_[idx]->handler() &&
"Cannot mark an async or generic method Streamed");
methods_[idx]->SetHandler(streamed_method);
// From the server's point of view, streamed unary is a special
// case of BIDI_STREAMING that has 1 read and 1 write, in that order,
// and split server-side streaming is BIDI_STREAMING with 1 read and
// any number of writes, in that order.
methods_[idx]->SetMethodType(internal::RpcMethod::BIDI_STREAMING);
}
private:
friend class Server;
friend class ServerInterface;
ServerInterface* server_;
std::vector<std::unique_ptr<internal::RpcServiceMethod>> methods_;
};
} // namespace grpc
#endif // GRPCPP_IMPL_CODEGEN_SERVICE_TYPE_H
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