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Fabric: RCTSurfacePresenter & thread-safety 

Summary:
Instead of wrapping all public methods into The controller you requested could not be found. blocks/mutexes, RCTSurfacePresenter utilizes a different thread-safety pattern where all instance variable are granularly thread-safe.
The names of all internal methods were prefixed by '_'.

Reviewed By: mdvacca

Differential Revision: D10033407

fbshipit-source-id: 97fd2879c879dd9ef8d9ece24e25af00f749a871
This commit is contained in:
Valentin Shergin 2018-09-26 10:02:06 -07:00 committed by Facebook Github Bot
parent c69313fc52
commit 6af687dec5
1 changed files with 97 additions and 91 deletions
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188
React/Fabric/RCTSurfacePresenter.mm
View File

@ -7,6 +7,8 @@
#import "RCTSurfacePresenter.h"
#import <mutex>
#import <React/RCTAssert.h>
#import <React/RCTBridge+Private.h>
#import <React/RCTComponentViewRegistry.h>
@ -38,11 +40,12 @@ using namespace facebook::react;
@end
@implementation RCTSurfacePresenter {
RCTScheduler *_Nullable _scheduler;
RCTMountingManager *_mountingManager;
RCTBridge *_bridge;
std::mutex _schedulerMutex;
RCTScheduler *_Nullable _scheduler; // Thread-safe. Mutation of the instance variable is protected by `_schedulerMutex`.
RCTMountingManager *_mountingManager; // Thread-safe.
RCTSurfaceRegistry *_surfaceRegistry; // Thread-safe.
RCTBridge *_bridge; // Unsafe. We are moving away from Bridge.
RCTBridge *_batchedBridge;
RCTSurfaceRegistry *_surfaceRegistry;
}
- (instancetype)initWithBridge:(RCTBridge *)bridge
@ -74,10 +77,71 @@ using namespace facebook::react;
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)createSchedulerIfNeeded
#pragma mark - Internal Surface-dedicated Interface
- (void)registerSurface:(RCTFabricSurface *)surface
{
[_surfaceRegistry registerSurface:surface];
[self _startSurface:surface];
}
- (void)unregisterSurface:(RCTFabricSurface *)surface
{
[self _stopSurface:surface];
[_surfaceRegistry unregisterSurface:surface];
}
- (void)setProps:(NSDictionary *)props
surface:(RCTFabricSurface *)surface
{
// This implementation is suboptimal indeed but still better than nothing for now.
[self _stopSurface:surface];
[self _startSurface:surface];
}
- (RCTFabricSurface *)surfaceForRootTag:(ReactTag)rootTag
{
return [_surfaceRegistry surfaceForRootTag:rootTag];
}
- (CGSize)sizeThatFitsMinimumSize:(CGSize)minimumSize
maximumSize:(CGSize)maximumSize
surface:(RCTFabricSurface *)surface
{
LayoutContext layoutContext;
layoutContext.pointScaleFactor = RCTScreenScale();
LayoutConstraints layoutConstraints = {};
layoutConstraints.minimumSize = RCTSizeFromCGSize(minimumSize);
layoutConstraints.maximumSize = RCTSizeFromCGSize(maximumSize);
return [self._scheduler measureSurfaceWithLayoutConstraints:layoutConstraints
layoutContext:layoutContext
surfaceId:surface.rootTag];
}
- (void)setMinimumSize:(CGSize)minimumSize
maximumSize:(CGSize)maximumSize
surface:(RCTFabricSurface *)surface
{
LayoutContext layoutContext;
layoutContext.pointScaleFactor = RCTScreenScale();
LayoutConstraints layoutConstraints = {};
layoutConstraints.minimumSize = RCTSizeFromCGSize(minimumSize);
layoutConstraints.maximumSize = RCTSizeFromCGSize(maximumSize);
[self._scheduler constraintSurfaceLayoutWithLayoutConstraints:layoutConstraints
layoutContext:layoutContext
surfaceId:surface.rootTag];
}
#pragma mark - Private
- (RCTScheduler *)_scheduler
{
std::lock_guard<std::mutex> lock(_schedulerMutex);
if (_scheduler) {
return;
return _scheduler;
}
auto contextContainer = std::make_shared<ContextContainer>();
@ -102,96 +166,26 @@ using namespace facebook::react;
_scheduler = [[RCTScheduler alloc] initWithContextContainer:contextContainer];
_scheduler.delegate = self;
return _scheduler;
}
- (void)ensureSchedulerDoesExist
{
RCTAssert(_scheduler, @"RCTSurfacePresenter: RCTScheduler instance must be already instantiated at this point.");
}
#pragma mark - Internal Surface-dedicated Interface
- (void)registerSurface:(RCTFabricSurface *)surface
{
[_surfaceRegistry registerSurface:surface];
[self startSurface:surface];
}
- (void)unregisterSurface:(RCTFabricSurface *)surface
{
[self stopSurface:surface];
[_surfaceRegistry unregisterSurface:surface];
}
- (void)setProps:(NSDictionary *)props
surface:(RCTFabricSurface *)surface
{
// This implementation is suboptimal indeed but still better than nothing for now.
[self stopSurface:surface];
[self startSurface:surface];
}
- (RCTFabricSurface *)surfaceForRootTag:(ReactTag)rootTag
{
return [_surfaceRegistry surfaceForRootTag:rootTag];
}
- (CGSize)sizeThatFitsMinimumSize:(CGSize)minimumSize
maximumSize:(CGSize)maximumSize
surface:(RCTFabricSurface *)surface
{
[self ensureSchedulerDoesExist];
LayoutContext layoutContext;
layoutContext.pointScaleFactor = RCTScreenScale();
LayoutConstraints layoutConstraints = {};
layoutConstraints.minimumSize = RCTSizeFromCGSize(minimumSize);
layoutConstraints.maximumSize = RCTSizeFromCGSize(maximumSize);
return [_scheduler measureSurfaceWithLayoutConstraints:layoutConstraints
layoutContext:layoutContext
surfaceId:surface.rootTag];
}
- (void)setMinimumSize:(CGSize)minimumSize
maximumSize:(CGSize)maximumSize
surface:(RCTFabricSurface *)surface
{
[self ensureSchedulerDoesExist];
LayoutContext layoutContext;
layoutContext.pointScaleFactor = RCTScreenScale();
LayoutConstraints layoutConstraints = {};
layoutConstraints.minimumSize = RCTSizeFromCGSize(minimumSize);
layoutConstraints.maximumSize = RCTSizeFromCGSize(maximumSize);
[_scheduler constraintSurfaceLayoutWithLayoutConstraints:layoutConstraints
layoutContext:layoutContext
surfaceId:surface.rootTag];
}
- (void)startSurface:(RCTFabricSurface *)surface
- (void)_startSurface:(RCTFabricSurface *)surface
{
[_mountingManager.componentViewRegistry dequeueComponentViewWithName:@"Root" tag:surface.rootTag];
[self createSchedulerIfNeeded];
[_scheduler startSurfaceWithSurfaceId:surface.rootTag
moduleName:surface.moduleName
initailProps:surface.properties];
[self._scheduler startSurfaceWithSurfaceId:surface.rootTag
moduleName:surface.moduleName
initailProps:surface.properties];
[self setMinimumSize:surface.minimumSize
maximumSize:surface.maximumSize
surface:surface];
}
- (void)stopSurface:(RCTFabricSurface *)surface
- (void)_stopSurface:(RCTFabricSurface *)surface
{
[self ensureSchedulerDoesExist];
[_scheduler stopSurfaceWithSurfaceId:surface.rootTag];
[self._scheduler stopSurfaceWithSurfaceId:surface.rootTag];
UIView<RCTComponentViewProtocol> *rootView = [_mountingManager.componentViewRegistry componentViewByTag:surface.rootTag];
[_mountingManager.componentViewRegistry enqueueComponentViewWithName:@"Root" tag:surface.rootTag componentView:rootView];
@ -199,17 +193,17 @@ using namespace facebook::react;
[surface _unsetStage:(RCTSurfaceStagePrepared | RCTSurfaceStageMounted)];
}
- (void)startAllSurfaces
- (void)_startAllSurfaces
{
for (RCTFabricSurface *surface in _surfaceRegistry.enumerator) {
[self startSurface:surface];
[self _startSurface:surface];
}
}
- (void)stopAllSurfaces
- (void)_stopAllSurfaces
{
for (RCTFabricSurface *surface in _surfaceRegistry.enumerator) {
[self stopSurface:surface];
[self _stopSurface:surface];
}
}
@ -259,8 +253,20 @@ using namespace facebook::react;
- (void)handleBridgeWillReloadNotification:(NSNotification *)notification
{
[self stopAllSurfaces];
_scheduler = nil;
{
std::lock_guard<std::mutex> lock(_schedulerMutex);
if (!_scheduler) {
// Seems we are already in the realoding process.
return;
}
}
[self _stopAllSurfaces];
{
std::lock_guard<std::mutex> lock(_schedulerMutex);
_scheduler = nil;
}
}
- (void)handleJavaScriptDidLoadNotification:(NSNotification *)notification
@ -269,7 +275,7 @@ using namespace facebook::react;
if (bridge != _batchedBridge) {
_batchedBridge = bridge;
[self startAllSurfaces];
[self _startAllSurfaces];
}
}