tighter ContextContainer semantics
Summary: shergin mentioned that he'd like to move away from RTTI a bit and use explicit key strings for context container instances rather than relying on the `typeid`, so this does this. We also fatal with a useful error message if we get a collision, rather than failing silently. Reviewed By: shergin Differential Revision: D13384308 fbshipit-source-id: 0b06d7555b082be89e8f130c23e94be99749a7a3
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34ea65e3d9
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@ -173,7 +173,7 @@ using namespace facebook::react;
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_scheduler = [[RCTScheduler alloc] initWithContextContainer:self.contextContainer];
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_scheduler.delegate = self;
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return _scheduler;
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}
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@ -182,14 +182,14 @@ using namespace facebook::react;
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- (SharedContextContainer)contextContainer
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{
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std::lock_guard<std::mutex> lock(_contextContainerMutex);
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if (_contextContainer) {
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return _contextContainer;
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}
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_contextContainer = std::make_shared<ContextContainer>();
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_contextContainer->registerInstance(_reactNativeConfig);
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_contextContainer->registerInstance(_reactNativeConfig, "ReactNativeConfig");
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auto messageQueueThread = _batchedBridge.jsMessageThread;
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auto runtime = (facebook::jsi::Runtime *)((RCTCxxBridge *)_batchedBridge).runtime;
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@ -214,7 +214,7 @@ using namespace facebook::react;
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_contextContainer->registerInstance(runtimeExecutor, "runtime-executor");
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_contextContainer->registerInstance(std::make_shared<ImageManager>((__bridge void *)[_bridge imageLoader]));
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_contextContainer->registerInstance(std::make_shared<ImageManager>((__bridge void *)[_bridge imageLoader]), "ImageManager");
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return _contextContainer;
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}
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@ -27,7 +27,8 @@ class ImageComponentDescriptor final
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: ConcreteComponentDescriptor(eventDispatcher),
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imageManager_(
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contextContainer
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? contextContainer->getInstance<SharedImageManager>()
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? contextContainer->getInstance<SharedImageManager>(
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"ImageManager")
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: nullptr) {}
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void adopt(UnsharedShadowNode shadowNode) const override {
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@ -27,36 +27,39 @@ using SharedContextContainer = std::shared_ptr<ContextContainer>;
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class ContextContainer final {
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public:
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/*
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* Registers an instance of the particular type `T` in the container.
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* If `key` parameter is specified, the instance is registered
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* by `{type, key}` pair.
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* Registers an instance of the particular type `T` in the container
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* using the provided `key`. Only one instance can be registered per key.
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*
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* Convention is to use the plain base class name for the key, so for
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* example if the type `T` is `std::shared_ptr<const ReactNativeConfig>`,
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* then one would use `"ReactNativeConfig"` for the `key`, even if the
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* instance is actually a `shared_ptr` of derived class
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*`EmptyReactNativeConfig`.
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*/
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template <typename T>
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void registerInstance(const T &instance, const std::string &key = {}) {
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void registerInstance(const T &instance, const std::string &key) {
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std::lock_guard<std::mutex> lock(mutex_);
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instances_.insert(
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{{std::type_index(typeid(T)), key}, std::make_shared<T>(instance)});
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const auto res = instances_.insert({key, std::make_shared<T>(instance)});
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if (res.second == false) {
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LOG(FATAL) << "ContextContainer already had instance for key '" << key
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<< "'";
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}
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}
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/*
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* Returns a previously registered instance of the particular type `T`.
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* If `key` parameter is specified, the lookup will be performed
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* by {type, key} pair.
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* Returns a previously registered instance of the particular type `T`
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* for `key`.
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*/
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template <typename T>
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T getInstance(const std::string &key = {}) const {
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T getInstance(const std::string &key) const {
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std::lock_guard<std::mutex> lock(mutex_);
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return *std::static_pointer_cast<T>(
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instances_.at({std::type_index(typeid(T)), key}));
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return *std::static_pointer_cast<T>(instances_.at(key));
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}
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private:
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std::unordered_map<
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std::pair<std::type_index, std::string>,
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std::shared_ptr<void>>
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instances_;
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std::unordered_map<std::string, std::shared_ptr<void>> instances_;
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mutable std::mutex mutex_;
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};
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@ -28,7 +28,8 @@ Scheduler::Scheduler(const SharedContextContainer &contextContainer) {
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contextContainer->getInstance<RuntimeExecutor>("runtime-executor");
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reactNativeConfig_ =
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contextContainer->getInstance<std::shared_ptr<const ReactNativeConfig>>();
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contextContainer->getInstance<std::shared_ptr<const ReactNativeConfig>>(
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"ReactNativeConfig");
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auto uiManager = std::make_unique<UIManager>();
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auto &uiManagerRef = *uiManager;
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