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b4fa1fa0c6
Summary: Why do we need a dedicated registry class? * We need to simplify registry-related logic in Scheduler. * We need to couple threading aspect of the registry with the registry itself, otherwise it's not clear why exactly we acquire the mutex. We also should not acquire the mutex in a per-method way (as we did before), because it's incorrect and misleading (only lines that access the registry should by protected). * We need to have a way to share the registry with other classes (e.g. UIManager) without passing a reference to the whole Scheduler. Reviewed By: mdvacca Differential Revision: D13036550 fbshipit-source-id: 644da910e823666c586834a3da2b4cdcb90eebb2
56 lines
1.6 KiB
C++
56 lines
1.6 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 <react/core/ReactPrimitives.h>
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#include <react/uimanager/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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/*
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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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* 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 get(
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SurfaceId surfaceId,
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std::function<void(const ShadowTree &shadowTree)> callback) const;
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private:
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mutable std::mutex mutex_;
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mutable std::unordered_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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