mirror of
https://github.com/zhigang1992/react-native.git
synced 2026-04-29 04:35:36 +08:00
94969edf7c
Summary: ShadowTree commits happen concurrently with limited synchronization that only ensures the correctness of the commit from ShadowTree perspective. At the same time artifacts of the commit () needs to be delivered (also concurrently) to the proper thread and executed in order (not-concurrently). To achieve this we need some synchronization mechanism on the receiving (mounting) side. This class implements this process. Practically, this diff fixes a problem with glitching UI during the very first render of Fabric screen. Reviewed By: JoshuaGross Differential Revision: D15021794 fbshipit-source-id: 62982425300c515e92b91e1e660b45455a5446e9
46 lines
1.3 KiB
C++
46 lines
1.3 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/optional.h>
|
|
|
|
#include <react/mounting/MountingTransaction.h>
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
/*
|
|
* ShadowTree commits happen concurrently with limited synchronization that only
|
|
* ensures the correctness of the commit from ShadowTree perspective. At the
|
|
* same time artifacts of the commit () needs to be delivered (also
|
|
* concurrently) to the proper thread and executed in order (not-concurrently).
|
|
* To achieve this we need some synchronization mechanism on the receiving
|
|
* (mounting) side. This class implements this process. This class is *not*
|
|
* thread-safe (and must not be).
|
|
*/
|
|
class MountingTransactionSynchronizer final {
|
|
public:
|
|
/*
|
|
* Pushes (adds) a new MountingTransaction to the internal queue.
|
|
*/
|
|
void push(MountingTransaction &&transaction);
|
|
|
|
/*
|
|
* Pulls (returns and removes) a MountingTransaction from the internal queue
|
|
* if it has something ready to be pulled. Return an empty optional otherwise.
|
|
*/
|
|
better::optional<MountingTransaction> pull();
|
|
|
|
private:
|
|
MountingTransaction::Revision revision_{0};
|
|
std::deque<MountingTransaction> queue_{};
|
|
};
|
|
|
|
} // namespace react
|
|
} // namespace facebook
|