71 строка
1.9 KiB
C++
71 строка
1.9 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates.
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// This source code is licensed under the MIT license found in the
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// LICENSE file in the root directory of this source tree.
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#pragma once
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#include <memory>
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#include <mutex>
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#include <string>
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#include <typeindex>
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#include <typeinfo>
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#include <unordered_map>
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#include <utility>
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#include <glog/logging.h>
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namespace facebook {
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namespace react {
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class ContextContainer;
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using SharedContextContainer = std::shared_ptr<ContextContainer>;
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/*
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* General purpose dependecy injection container.
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* Instance types must be copyable.
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*/
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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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* 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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std::lock_guard<std::mutex> lock(mutex_);
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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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* 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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std::lock_guard<std::mutex> lock(mutex_);
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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<std::string, std::shared_ptr<void>> instances_;
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mutable std::mutex mutex_;
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};
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} // namespace react
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} // namespace facebook
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