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https://github.com/zhigang1992/react-native.git
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8d83d5f8eb
Summary: I read my code and one thing stroke me: What if the same event emitter dispatches several events during the same event beat? In the previous implementation, only the first one will be delivered because the first `release` call consumes stored strong reference. So, I changed the API a bit to make this more explicit: we have `retain` & `release` methods and we have a getter that works (multiple times) only if the object was successfully retained. Reviewed By: sahrens Differential Revision: D13668147 fbshipit-source-id: c00af5f15bc7e30aa704d46bd23584b918b6f75a
67 lines
1.5 KiB
C++
67 lines
1.5 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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#include "EventQueue.h"
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#include "EventEmitter.h"
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namespace facebook {
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namespace react {
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EventQueue::EventQueue(
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EventPipe eventPipe,
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std::unique_ptr<EventBeat> eventBeat)
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: eventPipe_(std::move(eventPipe)), eventBeat_(std::move(eventBeat)) {
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eventBeat_->setBeatCallback(
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std::bind(&EventQueue::onBeat, this, std::placeholders::_1));
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}
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void EventQueue::enqueueEvent(const RawEvent &rawEvent) const {
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std::lock_guard<std::mutex> lock(queueMutex_);
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queue_.push_back(rawEvent);
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}
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void EventQueue::onBeat(jsi::Runtime &runtime) const {
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std::vector<RawEvent> queue;
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{
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std::lock_guard<std::mutex> lock(queueMutex_);
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if (queue_.size() == 0) {
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return;
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}
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queue = std::move(queue_);
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queue_.clear();
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}
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{
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std::lock_guard<std::mutex> lock(EventEmitter::DispatchMutex());
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for (const auto &event : queue) {
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if (event.eventTarget) {
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event.eventTarget->retain(runtime);
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}
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}
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}
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for (const auto &event : queue) {
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eventPipe_(
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runtime, event.eventTarget.get(), event.type, event.payloadFactory);
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}
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// No need to lock `EventEmitter::DispatchMutex()` here.
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for (const auto &event : queue) {
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if (event.eventTarget) {
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event.eventTarget->release(runtime);
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}
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}
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}
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} // namespace react
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} // namespace facebook
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