70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
#ifndef MATADOR_COLLECTION_PROXY_HPP
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#define MATADOR_COLLECTION_PROXY_HPP
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#include "matador/object/collection_resolver.hpp"
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#include "matador/utils/identifier.hpp"
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#include <atomic>
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#include <mutex>
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#include <vector>
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namespace matador::object {
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template<typename Type>
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class collection_proxy final {
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public:
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collection_proxy() = default;
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// Lazy
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collection_proxy(std::weak_ptr<collection_resolver<Type>> resolver, utils::identifier owner_id)
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: owner_id_(std::move(owner_id)), resolver_(std::move(resolver)) {}
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// Eager
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collection_proxy(std::weak_ptr<collection_resolver<Type>> resolver, std::vector<Type> items)
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: loaded_{true}, items_(std::move(items)), resolver_(std::move(resolver)) {}
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// Transient
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explicit collection_proxy(std::vector<Type> items)
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: items_(std::move(items)) {}
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[[nodiscard]] const utils::identifier& owner_id() const {
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return owner_id_;
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}
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const std::vector<Type>& items() const {
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resolve();
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return items_;
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}
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std::vector<Type>& items() {
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resolve();
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return items_;
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}
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private:
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void resolve() {
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if (loaded_) {
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return;
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}
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std::lock_guard lock(mutex_);
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auto resolver = resolver_.lock();
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if (!resolver) {
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return;
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// Todo: Add states (Detached, Attached, Transient) - if attached an no resolver is available throw runtime exception
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// throw std::runtime_error("Detached proxy (session expired)");
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}
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items_ = resolver->resolve(owner_id_);
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loaded_ = true;
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}
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private:
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const utils::identifier owner_id_;
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std::atomic_bool loaded_{false};
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std::vector<Type> items_;
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std::weak_ptr<collection_resolver<Type>> resolver_{};
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mutable std::mutex mutex_{};
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};
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}
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#endif //MATADOR_COLLECTION_PROXY_HPP
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