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#pragma once
#include <memory>
#include <mutex>
#include "dac.hpp"
#include "display.hpp"
#include "gpio_expander.hpp"
#include "storage.hpp"
#include "touchwheel.hpp"
namespace drivers {
class DriverCache {
private:
std::unique_ptr<GpioExpander> gpios_;
std::weak_ptr<AudioDac> dac_;
std::weak_ptr<Display> display_;
std::weak_ptr<SdStorage> storage_;
std::weak_ptr<TouchWheel> touchwheel_;
// TODO(jacqueline): Haptics, samd
std::mutex mutex_;
template <typename T, typename F>
auto Acquire(std::weak_ptr<T> ptr, F factory) -> std::shared_ptr<T> {
std::shared_ptr<T> acquired = ptr.lock();
if (acquired) {
return acquired;
}
std::lock_guard<std::mutex> lock(mutex_);
acquired = ptr.lock();
if (acquired) {
return acquired;
}
acquired.reset(factory());
ptr = acquired;
return acquired;
}
public:
DriverCache();
~DriverCache();
auto AcquireGpios() -> GpioExpander*;
auto AcquireDac() -> std::shared_ptr<AudioDac>;
auto AcquireDisplay() -> std::shared_ptr<Display>;
auto AcquireStorage() -> std::shared_ptr<SdStorage>;
auto AcquireTouchWheel() -> std::shared_ptr<TouchWheel>;
};
} // namespace drivers
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