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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
61 lines
1.5 KiB
C++
61 lines
1.5 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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#pragma once
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#include <memory>
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#include <mutex>
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#include <folly/dynamic.h>
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#include <fabric/core/EventDispatcher.h>
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#include <fabric/core/EventPrimitives.h>
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#include <fabric/core/ReactPrimitives.h>
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namespace facebook {
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namespace react {
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class EventEmitter;
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using SharedEventEmitter = std::shared_ptr<const EventEmitter>;
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/*
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* Base class for all particular typed event handlers.
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* Stores `InstanceHandle` identifying a particular component and the pointer
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* to `EventDispatcher` which is responsible for delivering the event.
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*
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* TODO: Reconsider naming of all event-related things.
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*/
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class EventEmitter {
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public:
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EventEmitter(const InstanceHandle &instanceHandle, const Tag &tag, const SharedEventDispatcher &eventDispatcher);
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virtual ~EventEmitter();
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protected:
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/*
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* Initates an event delivery process.
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* Is used by particular subclasses only.
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*/
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void dispatchEvent(
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const std::string &type,
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const folly::dynamic &payload = folly::dynamic::object(),
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const EventPriority &priority = EventPriority::AsynchronousBatched
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) const;
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private:
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EventTarget createEventTarget() const;
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InstanceHandle instanceHandle_;
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Tag tag_;
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std::weak_ptr<const EventDispatcher> eventDispatcher_;
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mutable EventTarget eventTarget_ {nullptr};
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};
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} // namespace react
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} // namespace facebook
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