mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
28a5f122a8
Summary: MountingCoordinator is a borderline between Core and Mounting. Some of Core design constraints are impossible/impractical to enforce on Mounting layer, so we have to handle all of those cases in `MountingCoordinator`. One of the constrains is that all ShadowNodes implicitly depend on associated ComponentDescriptor instances without retaining them (retaining is expensive and creates a retain cycle). The problem is that the Mounting layer can call `MountingCoordinator::pull()` at any moment (even after the whole Core is already destroyed). To prevent this, the owner of a `MountingCoordinator` on the Core side calls `revoke()` right before being deallocated (right before the moment the owner cannot guarantee the constraint). Reviewed By: JoshuaGross Differential Revision: D17272295 fbshipit-source-id: ba8b02eab8f84cce68aa65c1ad36950cd2498049
99 lines
2.6 KiB
C++
99 lines
2.6 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 "MountingCoordinator.h"
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#ifdef RN_SHADOW_TREE_INTROSPECTION
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#include <glog/logging.h>
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#endif
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#include <react/mounting/Differentiator.h>
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#include <react/mounting/ShadowViewMutation.h>
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#include <react/utils/TimeUtils.h>
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namespace facebook {
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namespace react {
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MountingCoordinator::MountingCoordinator(ShadowTreeRevision baseRevision)
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: surfaceId_(baseRevision.getRootShadowNode().getSurfaceId()),
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baseRevision_(baseRevision) {
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#ifdef RN_SHADOW_TREE_INTROSPECTION
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stubViewTree_ = stubViewTreeFromShadowNode(baseRevision_.getRootShadowNode());
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#endif
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}
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SurfaceId MountingCoordinator::getSurfaceId() const {
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return surfaceId_;
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}
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void MountingCoordinator::push(ShadowTreeRevision &&revision) const {
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std::lock_guard<std::mutex> lock(mutex_);
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assert(revision.getNumber() > baseRevision_.getNumber());
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assert(
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!lastRevision_.has_value() ||
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revision.getNumber() != lastRevision_->getNumber());
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if (!lastRevision_.has_value() ||
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lastRevision_->getNumber() < revision.getNumber()) {
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lastRevision_ = std::move(revision);
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}
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}
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void MountingCoordinator::revoke() const {
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std::lock_guard<std::mutex> lock(mutex_);
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lastRevision_.reset();
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}
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better::optional<MountingTransaction> MountingCoordinator::pullTransaction()
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const {
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std::lock_guard<std::mutex> lock(mutex_);
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if (!lastRevision_.has_value()) {
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return {};
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}
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number_++;
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auto telemetry = lastRevision_->getTelemetry();
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telemetry.willDiff();
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auto mutations = calculateShadowViewMutations(
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baseRevision_.getRootShadowNode(), lastRevision_->getRootShadowNode());
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telemetry.didDiff();
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#ifdef RN_SHADOW_TREE_INTROSPECTION
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stubViewTree_.mutate(mutations);
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auto stubViewTree =
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stubViewTreeFromShadowNode(lastRevision_->getRootShadowNode());
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if (stubViewTree_ != stubViewTree) {
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LOG(ERROR) << "Old tree:"
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<< "\n"
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<< baseRevision_.getRootShadowNode().getDebugDescription()
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<< "\n";
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LOG(ERROR) << "New tree:"
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<< "\n"
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<< lastRevision_->getRootShadowNode().getDebugDescription()
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<< "\n";
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LOG(ERROR) << "Mutations:"
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<< "\n"
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<< getDebugDescription(mutations);
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assert(false);
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}
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#endif
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baseRevision_ = std::move(*lastRevision_);
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lastRevision_.reset();
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return MountingTransaction{
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surfaceId_, number_, std::move(mutations), telemetry};
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}
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} // namespace react
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} // namespace facebook
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