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/*
* Copyright 2017 The Native Object Protocols 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 LIBNOP_INCLUDE_NOP_RPC_SIMPLE_METHOD_SENDER_H_
#define LIBNOP_INCLUDE_NOP_RPC_SIMPLE_METHOD_SENDER_H_
#include <tuple>
namespace nop {
// SimpleMethodSender is a minimal implementation of the Sender type required by
// the remote interface support in nop/rpc/interface.h. This class simply
// serializes the method selector and arguments tuple with the given serializer
// and deserializes the return value using the given deserializer, leaving all
// transport-level concerns to the serializer and deserializer type.
template <typename Serializer, typename Deserializer>
class SimpleMethodSender {
public:
constexpr SimpleMethodSender(Serializer* serializer,
Deserializer* deserializer)
: serializer_{serializer}, deserializer_{deserializer} {}
template <typename MethodSelector, typename Return, typename... Args>
constexpr void SendMethod(MethodSelector method_selector,
Status<Return>* return_value,
const std::tuple<Args...>& args) {
auto status = serializer_->Write(method_selector);
if (!status) {
*return_value = status.error();
return;
}
status = serializer_->Write(args);
if (!status) {
*return_value = status.error();
return;
}
GetReturn(return_value);
}
constexpr const Serializer& serializer() const { return *serializer_; }
constexpr Serializer& serializer() { return *serializer_; }
constexpr const Deserializer& deserializer() const { return *deserializer_; }
constexpr Deserializer& deserializer() { return *deserializer_; }
private:
template <typename Return>
constexpr void GetReturn(Status<Return>* return_status) {
Return return_value;
auto status = deserializer_->Read(&return_value);
if (!status)
*return_status = status.error();
else
*return_status = std::move(return_value);
}
constexpr void GetReturn(Status<void>* return_status) { *return_status = {}; }
Serializer* serializer_;
Deserializer* deserializer_;
};
template <typename Serializer, typename Deserializer>
SimpleMethodSender<Serializer, Deserializer> MakeSimpleMethodSender(
Serializer* serializer, Deserializer* deserializer) {
return {serializer, deserializer};
}
} // namespace nop
#endif // LIBNOP_INCLUDE_NOP_RPC_SIMPLE_METHOD_SENDER_H_
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