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757518edba
Summary: Trivial. The name `visit` expresss intent more clearly and fits C++17 `std::visit` pattern. Reviewed By: mdvacca Differential Revision: D13269744 fbshipit-source-id: 6aa6569c58aa66673e3f3a1662390a74290b8e01
59 lines
1.7 KiB
C++
59 lines
1.7 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 <folly/SharedMutex.h>
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#include <shared_mutex>
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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 visit(
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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 folly::SharedMutex 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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