mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
e665a0f995
Summary: changelog: [internal] C++17 has implementation of shared_mutex in standard library. Let's use it instead of folly. Reviewed By: cipolleschi Differential Revision: D43275493 fbshipit-source-id: d766251226aa230110011aca94b4e697fe0d31a1
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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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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*/
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#pragma once
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#include <shared_mutex>
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#include <butter/map.h>
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#include <react/renderer/core/ReactPrimitives.h>
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#include <react/renderer/mounting/ShadowTree.h>
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namespace facebook {
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namespace react {
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/*
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* Owning registry of `ShadowTree`s.
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*/
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class ShadowTreeRegistry final {
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public:
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ShadowTreeRegistry() = default;
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~ShadowTreeRegistry();
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/*
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* Adds a `ShadowTree` instance to the registry.
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* The ownership of the instance is also transferred to the registry.
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* Can be called from any thread.
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*/
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void add(std::unique_ptr<ShadowTree> &&shadowTree) const;
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/*
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* Removes a `ShadowTree` instance with given `surfaceId` from the registry
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* and returns it as a result.
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* The ownership of the instance is also transferred to the caller.
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* Returns `nullptr` if a `ShadowTree` with given `surfaceId` was not found.
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* Can be called from any thread.
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*/
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std::unique_ptr<ShadowTree> remove(SurfaceId surfaceId) const;
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/*
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* Finds a `ShadowTree` instance with a given `surfaceId` in the registry and
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* synchronously calls the `callback` with a reference to the instance while
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* the mutex is being acquired.
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* Returns `true` if the registry has `ShadowTree` instance with corresponding
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* `surfaceId`, otherwise returns `false` without calling the `callback`.
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* Can be called from any thread.
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*/
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bool visit(
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SurfaceId surfaceId,
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std::function<void(const ShadowTree &shadowTree)> const &callback) const;
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/*
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* Enumerates all stored shadow trees.
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* Set `stop` to `true` to interrupt the enumeration.
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* Can be called from any thread.
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*/
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void enumerate(
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std::function<void(const ShadowTree &shadowTree, bool &stop)> const
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&callback) const;
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private:
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mutable std::shared_mutex mutex_;
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mutable butter::map<SurfaceId, std::unique_ptr<ShadowTree>>
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registry_; // Protected by `mutex_`.
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};
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} // namespace react
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} // namespace facebook
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