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109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
#pragma once
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#include "rpc/common/Concepts.hpp"
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#include "rpc/common/Types.hpp"
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#include "rpc/common/impl/Processors.hpp"
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#include <boost/json/value.hpp>
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#include <memory>
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namespace rpc {
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/**
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* @brief A type-erased Handler that can contain any (NextGen) RPC handler class
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*
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* This allows to store different handlers in one map/vector etc.
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* Support for copying was added in order to allow storing in a
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* map/unordered_map using the initializer_list constructor.
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*/
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class AnyHandler final {
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public:
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/**
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* @brief Type-erases any handler class.
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*
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* @tparam HandlerType The real type of wrapped handler class
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* @tparam ProcessingStrategy A strategy that implements how processing of JSON is to be done
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* @param handler The handler to wrap. Required to fulfil the @ref rpc::SomeHandler concept.
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*/
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template <
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SomeHandler HandlerType,
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typename ProcessingStrategy = impl::DefaultProcessor<HandlerType>>
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/* implicit */ AnyHandler(HandlerType&& handler)
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: pimpl_{std::make_unique<Model<HandlerType, ProcessingStrategy>>(
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std::forward<HandlerType>(handler)
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)}
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{
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}
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/** @cond */
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~AnyHandler() = default;
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AnyHandler(AnyHandler const& other) : pimpl_{other.pimpl_->clone()}
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{
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}
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AnyHandler&
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operator=(AnyHandler const& rhs)
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{
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AnyHandler copy{rhs};
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pimpl_.swap(copy.pimpl_);
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return *this;
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}
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AnyHandler(AnyHandler&&) = default;
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AnyHandler&
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operator=(AnyHandler&&) = default;
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/** @endcond */
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/**
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* @brief Process incoming JSON by the stored handler
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*
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* @param value The JSON to process
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* @param ctx Request context
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* @return JSON result or Status on error
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*/
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[[nodiscard]] ReturnType
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process(boost::json::value const& value, Context const& ctx) const
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{
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return pimpl_->process(value, ctx);
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}
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private:
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struct Concept {
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virtual ~Concept() = default;
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[[nodiscard]] virtual ReturnType
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process(boost::json::value const& value, Context const& ctx) const = 0;
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[[nodiscard]] virtual std::unique_ptr<Concept>
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clone() const = 0;
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};
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template <typename HandlerType, typename ProcessorType>
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struct Model : Concept {
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HandlerType handler;
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ProcessorType processor;
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Model(HandlerType&& handler) : handler{std::move(handler)}
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{
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}
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[[nodiscard]] ReturnType
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process(boost::json::value const& value, Context const& ctx) const override
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{
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return processor(handler, value, ctx);
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}
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[[nodiscard]] std::unique_ptr<Concept>
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clone() const override
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{
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return std::make_unique<Model>(*this);
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}
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};
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private:
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std::unique_ptr<Concept> pimpl_;
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};
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} // namespace rpc
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