mirror of
https://github.com/zhigang1992/react-native.git
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b1814b37aa
Summary: EventTargetWrapper and EventTarget were merged into one class that controls an `instanceHandle` reference and extracting a strong reference to it. This diff also decouples the operation of retaining a strong reference (with checking a `enabled` flag) from actual usage of this reference. This allows to wrap into a mutex only first part of this process and avoid possible deadlocks. Reviewed By: sahrens Differential Revision: D13616382 fbshipit-source-id: 9907bc12047386fcf027929ae2ae41c0b727cd06
49 lines
1.1 KiB
C++
49 lines
1.1 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 "EventTarget.h"
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namespace facebook {
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namespace react {
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using Tag = EventTarget::Tag;
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EventTarget::EventTarget(
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jsi::Runtime &runtime,
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const jsi::Value &instanceHandle,
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Tag tag)
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: weakInstanceHandle_(
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jsi::WeakObject(runtime, instanceHandle.asObject(runtime))),
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strongInstanceHandle_(jsi::Value::null()),
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tag_(tag) {}
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void EventTarget::setEnabled(bool enabled) const {
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enabled_ = enabled;
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}
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void EventTarget::retain(jsi::Runtime &runtime) const {
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if (!enabled_) {
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return;
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}
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strongInstanceHandle_ = weakInstanceHandle_.lock(runtime);
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}
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jsi::Value EventTarget::release(jsi::Runtime &runtime) const {
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// The method does not use `jsi::Runtime` reference.
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// It takes it only to ensure thread-safety (if the caller has the reference,
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// we are on a proper thread).
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return std::move(strongInstanceHandle_);
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}
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Tag EventTarget::getTag() const {
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return tag_;
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}
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} // namespace react
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} // namespace facebook
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