GT2/Ejectable/node_modules/react-native/ReactCommon/fabric/mounting/ShadowTreeRegistry.h

70 lines
2.0 KiB
C++

/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <better/map.h>
#include <better/mutex.h>
#include <react/core/ReactPrimitives.h>
#include <react/mounting/ShadowTree.h>
namespace facebook {
namespace react {
/*
* Owning registry of `ShadowTree`s.
*/
class ShadowTreeRegistry final {
public:
ShadowTreeRegistry() = default;
~ShadowTreeRegistry();
/*
* Adds a `ShadowTree` instance to the registry.
* The ownership of the instance is also transferred to the registry.
* Can be called from any thread.
*/
void add(std::unique_ptr<ShadowTree> &&shadowTree) const;
/*
* Removes a `ShadowTree` instance with given `surfaceId` from the registry
* and returns it as a result.
* The ownership of the instance is also transferred to the caller.
* Can be called from any thread.
*/
std::unique_ptr<ShadowTree> remove(SurfaceId surfaceId) const;
/*
* Finds a `ShadowTree` instance with a given `surfaceId` in the registry and
* synchronously calls the `callback` with a reference to the instance while
* the mutex is being acquired.
* Returns `true` if the registry has `ShadowTree` instance with corresponding
* `surfaceId`, otherwise returns `false` without calling the `callback`.
* Can be called from any thread.
*/
bool visit(
SurfaceId surfaceId,
std::function<void(const ShadowTree &shadowTree)> callback) const;
/*
* Enumerates all stored shadow trees.
* Set `stop` to `true` to interrupt the enumeration.
* Can be called from any thread.
*/
void enumerate(std::function<void(const ShadowTree &shadowTree, bool &stop)>
callback) const;
private:
mutable better::shared_mutex mutex_;
mutable better::map<SurfaceId, std::unique_ptr<ShadowTree>>
registry_; // Protected by `mutex_`.
};
} // namespace react
} // namespace facebook