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https://github.com/status-im/react-native.git
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20a8673b48
Summary: @public There are some race conditions between VM objects getting deallocated and the instanceHandle held by the eventEmitter can point to deallocated memory space, causing undefined behavior like a crash. For now, keep a strong ref to the eventTarget inside EventEmitter to avoid that scenario. This is a temporary workaround. Reviewed By: shergin Differential Revision: D8576785 fbshipit-source-id: 87ef36f716270ceca906b32bb86e0046ceaca19e
60 lines
1.6 KiB
C++
60 lines
1.6 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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if (eventDispatcher) {
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eventTarget_ = createEventTarget();
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}
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}
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EventEmitter::~EventEmitter() {
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auto &&eventDispatcher = eventDispatcher_.lock();
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if (eventDispatcher && eventTarget_) {
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eventDispatcher->releaseEventTarget(eventTarget_);
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}
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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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assert(eventTarget_ && "Attempted to dispatch an event without an eventTarget.");
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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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EventTarget EventEmitter::createEventTarget() const {
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auto &&eventDispatcher = eventDispatcher_.lock();
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assert(eventDispatcher);
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return eventDispatcher->createEventTarget(instanceHandle_);
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}
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} // namespace react
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} // namespace facebook
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