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https://github.com/status-im/react-native.git
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d49ebbcf62
Summary: Using `EventHandlers` name was a bad idea, and I cannot tolerate it anymore. The worst part of it is that when you have a collection of `EventHandlers` objects you cannot use plural word to describe it because `EventHandlers` is an already plural word. And, this object is actually an event emitter, the thing on which we call events. Reviewed By: fkgozali Differential Revision: D8247723 fbshipit-source-id: b3303a4b9529bd6d32bb8ca0378287ebefaedda8
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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 "EventEmitter.h"
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#include <folly/dynamic.h>
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namespace facebook {
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namespace react {
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EventEmitter::EventEmitter(const InstanceHandle &instanceHandle, const Tag &tag, const SharedEventDispatcher &eventDispatcher):
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instanceHandle_(instanceHandle),
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tag_(tag),
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eventDispatcher_(eventDispatcher) {}
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EventEmitter::~EventEmitter() {
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releaseEventTargetIfNeeded();
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}
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void EventEmitter::dispatchEvent(
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const std::string &type,
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const folly::dynamic &payload,
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const EventPriority &priority
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) const {
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auto &&eventDispatcher = eventDispatcher_.lock();
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if (!eventDispatcher) {
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return;
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}
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createEventTargetIfNeeded();
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// Mixing `target` into `payload`.
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assert(payload.isObject());
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folly::dynamic extendedPayload = folly::dynamic::object("target", tag_);
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extendedPayload.merge_patch(payload);
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// TODO(T29610783): Reconsider using dynamic dispatch here.
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eventDispatcher->dispatchEvent(eventTarget_, type, extendedPayload, priority);
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}
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void EventEmitter::createEventTargetIfNeeded() const {
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std::lock_guard<std::mutex> lock(mutex_);
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if (eventTarget_) {
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return;
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}
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auto &&eventDispatcher = eventDispatcher_.lock();
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assert(eventDispatcher);
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eventTarget_ = eventDispatcher->createEventTarget(instanceHandle_);
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}
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void EventEmitter::releaseEventTargetIfNeeded() const {
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std::lock_guard<std::mutex> lock(mutex_);
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if (!eventTarget_) {
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return;
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}
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auto &&eventDispatcher = eventDispatcher_.lock();
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assert(eventDispatcher);
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eventDispatcher->releaseEventTarget(eventTarget_);
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}
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} // namespace react
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} // namespace facebook
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