mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
d76e03f85a
Summary: `RunLoopObserver` is one of the core interfaces that bridge intrinsically platform-specific functionality to cross-platform React Native core. `RunLoopObserver` allows subscribing for notifications about changes in a run loop life cycle. Primarily it supposed to be used for observing UI (aka main) and JavaScript execution thread/run-loop. Having a `RunLoopObserver` implemented in a platform-specific manner allows building these components in a cross-platform manner: * Sync and async UI event delivery pipeline; * Timing for some animation engine; * Timers (probably additional features are required). Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC Differential Revision: D21341997 fbshipit-source-id: 7ef61fb51f550dd0f2e89c64af657e0f0de029aa
63 lines
1.4 KiB
C++
63 lines
1.4 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 "RunLoopObserver.h"
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#include <cassert>
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namespace facebook {
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namespace react {
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RunLoopObserver::RunLoopObserver(
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Activity activities,
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WeakOwner const &owner) noexcept
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: activities_(activities), owner_(owner) {}
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void RunLoopObserver::setDelegate(Delegate const *delegate) const noexcept {
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// We need these constraints to ensure basic thread-safety.
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assert(delegate && "A delegate must not be `nullptr`.");
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assert(!delegate_ && "`RunLoopObserver::setDelegate` must be called once.");
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delegate_ = delegate;
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}
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void RunLoopObserver::enable() const noexcept {
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if (enabled_) {
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return;
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}
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enabled_ = true;
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startObserving();
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}
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void RunLoopObserver::disable() const noexcept {
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if (!enabled_) {
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return;
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}
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enabled_ = false;
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stopObserving();
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}
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void RunLoopObserver::activityDidChange(Activity activity) const noexcept {
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if (!enabled_) {
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return;
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}
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assert(
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!owner_.expired() &&
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"`owner_` is null. The caller must `lock` the owner and check it for being not null.");
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delegate_->activityDidChange(delegate_, activity);
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}
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RunLoopObserver::WeakOwner RunLoopObserver::getOwner() const noexcept {
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return owner_;
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}
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} // namespace react
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} // namespace facebook
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