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zhongwuzw
25a58d7bbb
Summary: Replace `folly::SharedMutex` with `better::shared_mutex`, consolidate the shared_mutex. cc. shergin . [General] [Changed] - Consolidate shared_mutex with better::shared_mutex Pull Request resolved: https://github.com/facebook/react-native/pull/24075 Differential Revision: D14559213 Pulled By: shergin fbshipit-source-id: 934c7cd7db9ce60031d6b007faeebb353860268f
91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/**
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* Copyright (c) Facebook, Inc. and its 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 <react/imagemanager/ImageResponse.h>
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#include <react/imagemanager/ImageResponseObserver.h>
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#include <better/mutex.h>
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#include <vector>
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namespace facebook {
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namespace react {
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/*
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* The ImageResponseObserverCoordinator receives events and completed image
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* data from native image loaders and sends events to any observers attached
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* to the coordinator. The Coordinator also keeps track of response status
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* and caches completed images.
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*/
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class ImageResponseObserverCoordinator {
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public:
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/*
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* Default constructor.
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*/
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ImageResponseObserverCoordinator();
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/*
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* Default destructor.
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*/
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~ImageResponseObserverCoordinator();
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/*
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* Interested parties may observe the image response.
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*/
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void addObserver(ImageResponseObserver *observer) const;
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/*
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* Interested parties may stop observing the image response.
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*/
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void removeObserver(ImageResponseObserver *observer) const;
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/*
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* Platform-specific image loader will call this method with progress updates.
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*/
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void nativeImageResponseProgress(float) const;
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/*
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* Platform-specific image loader will call this method with a completed image
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* response.
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*/
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void nativeImageResponseComplete(const ImageResponse &imageResponse) const;
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/*
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* Platform-specific image loader will call this method in case of any
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* failures.
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*/
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void nativeImageResponseFailed() const;
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private:
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/*
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* List of observers.
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* Mutable: protected by mutex_.
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*/
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mutable std::vector<ImageResponseObserver *> observers_;
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/*
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* Current status of image loading.
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* Mutable: protected by mutex_.
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*/
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mutable ImageResponse::Status status_;
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/*
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* Cache image data.
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* Mutable: protected by mutex_.
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*/
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mutable std::shared_ptr<void> imageData_{};
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/*
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* Observer and data mutex.
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*/
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mutable better::shared_mutex mutex_;
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};
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} // namespace react
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} // namespace facebook
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