Add a RAII-friendly DI wrapper for driver instances

1 files changed, 43 insertions, 0 deletions

diff --git a/src/drivers/driver_cache.cpp b/src/drivers/driver_cache.cpp
new file mode 100644
index 00000000..650e6f16
--- /dev/null
+++ b/src/drivers/driver_cache.cpp
@@ -0,0 +1,43 @@
+#include "driver_cache.hpp"
+
+#include <memory>
+#include <mutex>
+
+#include "display.hpp"
+#include "display_init.hpp"
+#include "storage.hpp"
+#include "touchwheel.hpp"
+
+namespace drivers {
+
+DriverCache::DriverCache() : gpios_(std::make_unique<GpioExpander>()) {}
+DriverCache::~DriverCache() {}
+
+auto DriverCache::AcquireGpios() -> GpioExpander* {
+  return gpios_.get();
+}
+
+auto DriverCache::AcquireDac() -> std::shared_ptr<AudioDac> {
+  return Acquire(dac_, [&]() -> AudioDac* {
+    return AudioDac::create(AcquireGpios()).value_or(nullptr);
+  });
+}
+
+auto DriverCache::AcquireDisplay() -> std::shared_ptr<Display> {
+  return Acquire(display_, [&]() -> Display* {
+    return Display::create(AcquireGpios(), displays::kST7735R);
+  });
+}
+
+auto DriverCache::AcquireStorage() -> std::shared_ptr<SdStorage> {
+  return Acquire(storage_, [&]() -> SdStorage* {
+    return SdStorage::create(AcquireGpios()).value_or(nullptr);
+  });
+}
+
+auto DriverCache::AcquireTouchWheel() -> std::shared_ptr<TouchWheel> {
+  return Acquire(touchwheel_,
+                 [&]() -> TouchWheel* { return new TouchWheel(); });
+}
+
+}  // namespace drivers