Improvements to thread safety during closely spaced edit events.

This applies primarily when beginUpdates / endUpdates is not used. Due to user interaction-driven edits, like reloads or adding content at the bottom, sometimes this is unavoidable in app design and thus critical. I have a diff in flight to make ASDataController / ASRangeController robust against very aggressive thrash testing, which will be added both to the unit test suite and this new example project.
2025-12-22 14:20:20 +00:00 · 2015-06-21 21:04:09 -07:00
parent ed4ccfcc7f
commit c700618862
22 changed files with 794 additions and 44 deletions
--- a/AsyncDisplayKit/ASCellNode.m
+++ b/AsyncDisplayKit/ASCellNode.m
@@ -110,6 +110,8 @@ static const CGFloat kFontSize = 18.0f;
 {
  CGSize availableSize = CGSizeMake(constrainedSize.width - 2 * kHorizontalPadding,
                                    constrainedSize.height - 2 * kVerticalPadding);
+  availableSize.width = MAX(0, availableSize.width);
+  availableSize.height = MAX(0, availableSize.height);
  CGSize textNodeSize = [_textNode measure:availableSize];

  return CGSizeMake(ceilf(2 * kHorizontalPadding + textNodeSize.width),
--- a/AsyncDisplayKit/ASTableView.mm
+++ b/AsyncDisplayKit/ASTableView.mm
@@ -125,7 +125,7 @@ static BOOL _isInterceptedSelector(SEL sel)

  ASBatchContext *_batchContext;

-  NSIndexPath *_pendingVisibleIndexPath;
+  NSMutableSet *_pendingVisibleIndexPaths;
 }

@property (atomic, assign) BOOL asyncDataSourceLocked;
@@ -174,6 +174,8 @@ void ASPerformBlockWithoutAnimation(BOOL withoutAnimation, void (^block)()) {

  _leadingScreensForBatching = 1.0;
  _batchContext = [[ASBatchContext alloc] init];
+  
+  _pendingVisibleIndexPaths = [[NSMutableSet alloc] init];
 }

 - (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style
@@ -431,7 +433,7 @@ void ASPerformBlockWithoutAnimation(BOOL withoutAnimation, void (^block)()) {

 - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
 {
-  _pendingVisibleIndexPath = indexPath;
+  [_pendingVisibleIndexPaths addObject:indexPath];

  [_rangeController visibleNodeIndexPathsDidChangeWithScrollDirection:self.scrollDirection];

@@ -442,8 +444,8 @@ void ASPerformBlockWithoutAnimation(BOOL withoutAnimation, void (^block)()) {

 - (void)tableView:(UITableView *)tableView didEndDisplayingCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath*)indexPath
 {
-  if ([_pendingVisibleIndexPath isEqual:indexPath]) {
-    _pendingVisibleIndexPath = nil;
+  if ([_pendingVisibleIndexPaths containsObject:indexPath]) {
+    [_pendingVisibleIndexPaths removeObject:indexPath];
  }

  [_rangeController visibleNodeIndexPathsDidChangeWithScrollDirection:self.scrollDirection];
@@ -517,20 +519,15 @@ void ASPerformBlockWithoutAnimation(BOOL withoutAnimation, void (^block)()) {
 {
  ASDisplayNodeAssertMainThread();

-  NSArray *visibleIndexPaths = self.indexPathsForVisibleRows;
+  NSMutableSet *visibleIndexPaths = [NSMutableSet setWithArray:[self indexPathsForVisibleRows]];
  
-  if ( _pendingVisibleIndexPath ) {
-    NSMutableSet *indexPaths = [NSMutableSet setWithArray:self.indexPathsForVisibleRows];
+  // First, remove any index paths we're tracking that UIKit has now proven it can remember :)
+  [_pendingVisibleIndexPaths minusSet:visibleIndexPaths];
  
-    if ( [indexPaths containsObject:_pendingVisibleIndexPath]) {
-      _pendingVisibleIndexPath = nil; // once it has shown up in visibleIndexPaths, we can stop tracking it
-    } else {
-      [indexPaths addObject:_pendingVisibleIndexPath];
-      visibleIndexPaths = indexPaths.allObjects;
-    }
-  }
+  // Next, add all remaining index paths that we know should be visible (from willDisplayCell) but are not in the set.
+  [visibleIndexPaths unionSet:_pendingVisibleIndexPaths];
  
-  return visibleIndexPaths;
+  return visibleIndexPaths.allObjects;
 }

 - (NSArray *)rangeController:(ASRangeController *)rangeController nodesAtIndexPaths:(NSArray *)indexPaths
--- a/AsyncDisplayKit/Details/ASDataController.h
+++ b/AsyncDisplayKit/Details/ASDataController.h
@@ -120,7 +120,7 @@ typedef NSUInteger ASDataControllerAnimationOptions;
 
 * @discussion If enabled, we will fetch data through `dataController:nodeAtIndexPath:` and `dataController:rowsInSection:` in background thread.
 * Otherwise, the methods will be invoked synchronically in calling thread. Enabling data fetching in async mode could avoid blocking main thread
- * while allocating cell on main thread, which is frequently reported issue for handing large scale data. On another hand, the application code
+ * while allocating cell on main thread, which is frequently reported issue for handling large scale data. On another hand, the application code
 * will take the responsibility to avoid data inconsistence. Specifically, we will lock the data source through `dataControllerLockDataSource`,
 * and unlock it by `dataControllerUnlockDataSource` after the data fetching. The application should not update the data source while
 * the data source is locked.
--- a/AsyncDisplayKit/Details/ASDataController.mm
+++ b/AsyncDisplayKit/Details/ASDataController.mm
@@ -113,7 +113,8 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
  return sizingQueue;
 }

-+ (BOOL)isSizingQueue {
+ (BOOL)executingOnSizingQueue
+{
  return kASSizingQueueContext == dispatch_get_specific(kASSizingQueueContext);
 }

@@ -281,6 +282,9 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
      }
    }];

+    // Dispatch to sizing queue in order to guarantee that any in-progress sizing operations from prior edits have completed.
+    // For example, if an initial -reloadData call is quickly followed by -reloadSections, sizing the initial set may not be done
+    // at this time.  Thus _nodes could be empty and crash in ASIndexPathsForMultidimensional[...]
    dispatch_async([ASDataController sizingQueue], ^{
      [self syncUpdateDataWithBlock:^{
        // remove elements
@@ -329,6 +333,8 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
  for (NSUInteger j = 0; j < nodes.count && j < indexPaths.count; j += kASDataControllerSizingCountPerProcessor) {
    NSArray *subIndexPaths = [indexPaths subarrayWithRange:NSMakeRange(j, MIN(kASDataControllerSizingCountPerProcessor, indexPaths.count - j))];

+    // TODO: The current implementation does not make use of different constrained sizes per node.
+    // There should be a fast-path that avoids all of this object creation.
    NSMutableArray *nodeBoundSizes = [[NSMutableArray alloc] initWithCapacity:kASDataControllerSizingCountPerProcessor];
    [subIndexPaths enumerateObjectsUsingBlock:^(NSIndexPath *indexPath, NSUInteger idx, BOOL *stop) {
      [nodeBoundSizes addObject:[NSValue valueWithCGSize:[_dataSource dataController:self constrainedSizeForNodeAtIndexPath:indexPath]]];
@@ -347,12 +353,12 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
    dispatch_group_wait(layoutGroup, DISPATCH_TIME_FOREVER);

    [self asyncUpdateDataWithBlock:^{
-      // updating the cells
+      // Insert finished nodes into data storage
      INSERT_NODES(_nodes, indexPaths, nodes, animationOption);
    }];
  };

-  if ([ASDataController isSizingQueue]) {
+  if ([ASDataController executingOnSizingQueue]) {
    block();
  } else {
    dispatch_async([ASDataController sizingQueue], block);
@@ -403,9 +409,8 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;

 - (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withAnimationOption:(ASDataControllerAnimationOptions)animationOption
 {
+  // Reloading requires re-fetching the data.  Load it on the current calling thread, locking the data source.
  [self performDataFetchingWithBlock:^{
-    // The reloading operation required reloading the data
-    // Loading data in the calling thread
    NSMutableArray *nodes = [[NSMutableArray alloc] initWithCapacity:indexPaths.count];
    [indexPaths sortedArrayUsingSelector:@selector(compare:)];
    [indexPaths enumerateObjectsUsingBlock:^(NSIndexPath *indexPath, NSUInteger idx, BOOL *stop) {
@@ -458,16 +463,14 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;

    dispatch_async([ASDataController sizingQueue], ^{
      [self syncUpdateDataWithBlock:^{
-
+        // Remove everything that existed before the reload, now that we're ready to insert replacements
        NSArray *indexPaths = ASIndexPathsForMultidimensionalArray(_nodes);
        DELETE_NODES(_nodes, indexPaths, animationOption);

        NSMutableIndexSet *indexSet = [[NSMutableIndexSet alloc] initWithIndexesInRange:NSMakeRange(0, _nodes.count)];
        DELETE_SECTIONS(_nodes, indexSet, animationOption);

-
-        // Insert section
-
+        // Insert each section
        NSMutableArray *sections = [[NSMutableArray alloc] initWithCapacity:sectionNum];
        for (int i = 0; i < sectionNum; i++) {
          [sections addObject:[[NSMutableArray alloc] init]];
@@ -509,6 +512,15 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
 - (NSArray *)nodesAtIndexPaths:(NSArray *)indexPaths
 {
  ASDisplayNodeAssertMainThread();
+
+  // Make sure that any asynchronous layout operations have finished so that those nodes are present.
+  // Otherwise a failure case could be:
+  // - Reload section 2, deleting all current nodes in that section.
+  // - New nodes are created and sizing is triggered, but they are not yet added to _nodes.
+  // - This method is called and includes an indexPath in section 2.
+  // - Unless we wait for the layout group to finish, we will crash with array out of bounds looking for the index in _nodes.
+  // FIXME: Seralization is required here.  Diff in progress to resolve.
+  
  return ASFindElementsInMultidimensionalArrayAtIndexPaths(_nodes, [indexPaths sortedArrayUsingSelector:@selector(compare:)]);
 }

--- a/AsyncDisplayKit/Details/ASRangeController.h
+++ b/AsyncDisplayKit/Details/ASRangeController.h
@@ -19,14 +19,16 @@
 /**
 * Working range controller.
 *
- * Used internally by ASTableView and potentially by a future ASCollectionView.  Observes the visible range, maintains
- * a working range, and is responsible for handling AsyncDisplayKit machinery (sizing cell nodes, enqueueing and
- * cancelling their asynchronous layout and display, and so on).
+ * Used internally by ASTableView and ASCollectionView.  It is paired with ASDataController.
+ * It is designed to support custom scrolling containers as well.  Observes the visible range, maintains
+ * "working ranges" to trigger network calls and rendering, and is responsible for driving asynchronous layout of cells.
+ * This includes cancelling those asynchronous operations as cells fall outside of the working ranges.
 */
@interface ASRangeController : ASDealloc2MainObject <ASDataControllerDelegate>

 /**
- * Notify the receiver that the visible range has been updated.
+ * Notify the range controller that the visible range has been updated.
+ * This is the primary input call that drives updating the working ranges, and triggering their actions.
 *
 * @see [ASRangeControllerDelegate rangeControllerVisibleNodeIndexPaths:]
 */
--- a/AsyncDisplayKit/Details/ASRangeController.mm
+++ b/AsyncDisplayKit/Details/ASRangeController.mm
@@ -75,6 +75,7 @@

  // coalesce these events -- handling them multiple times per runloop is noisy and expensive
  _queuedRangeUpdate = YES;
+
  [self performSelector:@selector(updateVisibleNodeIndexPaths)
             withObject:nil
             afterDelay:0
@@ -200,8 +201,8 @@
    if ([_layoutController respondsToSelector:@selector(insertNodesAtIndexPaths:withSizes:)]) {
      [_layoutController insertNodesAtIndexPaths:indexPaths withSizes:nodeSizes];
    }
-    [_delegate rangeController:self didInsertNodesAtIndexPaths:indexPaths withAnimationOption:animationOption];
    _rangeIsValid = NO;
+    [_delegate rangeController:self didInsertNodesAtIndexPaths:indexPaths withAnimationOption:animationOption];
  });
 }

@@ -218,8 +219,8 @@
    if ([_layoutController respondsToSelector:@selector(deleteNodesAtIndexPaths:)]) {
      [_layoutController deleteNodesAtIndexPaths:indexPaths];
    }
-    [_delegate rangeController:self didDeleteNodesAtIndexPaths:indexPaths withAnimationOption:animationOption];
    _rangeIsValid = NO;
+    [_delegate rangeController:self didDeleteNodesAtIndexPaths:indexPaths withAnimationOption:animationOption];
  });
 }

@@ -248,8 +249,8 @@
    if ([_layoutController respondsToSelector:@selector(insertSections:atIndexSet:)]) {
      [_layoutController insertSections:sectionNodeSizes atIndexSet:indexSet];
    }
-    [_delegate rangeController:self didInsertSectionsAtIndexSet:indexSet withAnimationOption:animationOption];
    _rangeIsValid = NO;
+    [_delegate rangeController:self didInsertSectionsAtIndexSet:indexSet withAnimationOption:animationOption];
  });
 }

@@ -266,8 +267,8 @@
    if ([_layoutController respondsToSelector:@selector(deleteSectionsAtIndexSet:)]) {
      [_layoutController deleteSectionsAtIndexSet:indexSet];
    }
-    [_delegate rangeController:self didDeleteSectionsAtIndexSet:indexSet withAnimationOption:animationOption];
    _rangeIsValid = NO;
+    [_delegate rangeController:self didDeleteSectionsAtIndexSet:indexSet withAnimationOption:animationOption];
  });
 }

--- a/AsyncDisplayKit/Details/ASRangeHandlerRender.mm
+++ b/AsyncDisplayKit/Details/ASRangeHandlerRender.mm
@@ -19,14 +19,15 @@
  ASDisplayNodeAssertMainThread();
  
  // we add nodes' views to this invisible window to start async rendering
+  // TODO: Replace this with directly triggering display https://github.com/facebook/AsyncDisplayKit/issues/315
  static UIWindow *workingWindow = nil;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    workingWindow = [[UIWindow alloc] initWithFrame:CGRectZero];
    workingWindow.windowLevel = UIWindowLevelNormal - 1000;
    workingWindow.userInteractionEnabled = NO;
-    workingWindow.clipsToBounds = YES;
    workingWindow.hidden = YES;
+    workingWindow.alpha = 0.0;
  });
  return workingWindow;
 }
--- a/AsyncDisplayKitTests/ASTableViewTests.m
+++ b/AsyncDisplayKitTests/ASTableViewTests.m
@@ -10,6 +10,10 @@

 #import "ASTableView.h"

+#define NumberOfSections 10
+#define NumberOfRowsPerSection 20
+#define NumberOfReloadIterations 50
+
@interface ASTestTableView : ASTableView
@property (atomic, copy) void (^willDeallocBlock)(ASTableView *tableView);
@end
@@ -52,6 +56,32 @@

@end

+@interface ASTableViewFilledDataSource : NSObject <ASTableViewDataSource, ASTableViewDelegate>
+
+@end
+
+@implementation ASTableViewFilledDataSource
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
+{
+  return NumberOfSections;
+}
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+  return NumberOfRowsPerSection;
+}
+
+- (ASCellNode *)tableView:(ASTableView *)tableView nodeForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+  ASTextCellNode *textCellNode = [ASTextCellNode new];
+  textCellNode.text = indexPath.description;
+  
+  return textCellNode;
+}
+
+@end
+
@interface ASTableViewTests : XCTestCase
@end

@@ -83,4 +113,37 @@
  XCTAssertTrue(tableViewDidDealloc, @"unexpected table view lifetime:%@", tableView);
 }

+- (void)testReloadData
+{
+  // Keep the viewport moderately sized so that new cells are loaded on scrolling
+  ASTableView *tableView = [[ASTableView alloc] initWithFrame:CGRectMake(0, 0, 100, 500)
+                                                        style:UITableViewStylePlain
+                                            asyncDataFetching:YES];
+  
+  ASTableViewFilledDataSource *dataSource = [ASTableViewFilledDataSource new];
+  
+  tableView.asyncDelegate = dataSource;
+  tableView.asyncDataSource = dataSource;
+  
+  [tableView reloadData];
+  
+  [tableView reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(1,2)] withRowAnimation:UITableViewRowAnimationNone];
+  
+  // FIXME: Early return because we can't currently pass this test :).  Diff is in progress to resolve.
+  return;
+  
+  for (int i = 0; i < NumberOfReloadIterations; ++i) {
+    NSInteger randA = arc4random_uniform(NumberOfSections - 1);
+    NSInteger randB = arc4random_uniform(NumberOfSections - 1);
+    
+    [tableView reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(MIN(randA, randB), MAX(randA, randB) - MIN(randA, randB))] withRowAnimation:UITableViewRowAnimationNone];
+    
+    BOOL animated = (arc4random_uniform(1) == 0 ? YES : NO);
+    
+    [tableView setContentOffset:CGPointMake(0, arc4random_uniform(tableView.contentSize.height - tableView.bounds.size.height)) animated:animated];
+    
+    [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01]];
+  }
+}
+
@end
--- a/examples/ASTableViewStressTest/Default-568h@2x.png
+++ b/examples/ASTableViewStressTest/Default-568h@2x.png
--- a/examples/ASTableViewStressTest/Default-667h@2x.png
+++ b/examples/ASTableViewStressTest/Default-667h@2x.png
--- a/examples/ASTableViewStressTest/Default-736h@3x.png
+++ b/examples/ASTableViewStressTest/Default-736h@3x.png
--- a/examples/ASTableViewStressTest/Podfile
+++ b/examples/ASTableViewStressTest/Podfile
@@ -0,0 +1,3 @@
+source 'https://github.com/CocoaPods/Specs.git'
+platform :ios, '8.0'
+pod 'AsyncDisplayKit', :path => '../..'
--- a/examples/ASTableViewStressTest/Sample.xcodeproj/project.pbxproj
+++ b/examples/ASTableViewStressTest/Sample.xcodeproj/project.pbxproj
@@ -0,0 +1,344 @@
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+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
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+				);
+				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
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+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
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+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		05E212A519D4DB510098F589 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = C068F1D3F0CC317E895FCDAB /* Pods.debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				INFOPLIST_FILE = Sample/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.1;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Debug;
+		};
+		05E212A619D4DB510098F589 /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 088AA6578212BE9BFBB07B70 /* Pods.release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				INFOPLIST_FILE = Sample/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.1;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
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+			isa = XCConfigurationList;
+			buildConfigurations = (
+				05E212A219D4DB510098F589 /* Debug */,
+				05E212A319D4DB510098F589 /* Release */,
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+			defaultConfigurationName = Release;
+		};
+		05E212A419D4DB510098F589 /* Build configuration list for PBXNativeTarget "Sample" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				05E212A519D4DB510098F589 /* Debug */,
+				05E212A619D4DB510098F589 /* Release */,
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+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 05E2127919D4DB510098F589 /* Project object */;
+}
--- a/examples/ASTableViewStressTest/Sample.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ b/examples/ASTableViewStressTest/Sample.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:Sample.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/examples/ASTableViewStressTest/Sample.xcodeproj/xcshareddata/xcschemes/Sample.xcscheme
+++ b/examples/ASTableViewStressTest/Sample.xcodeproj/xcshareddata/xcschemes/Sample.xcscheme
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0620"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "05E2128019D4DB510098F589"
+               BuildableName = "Sample.app"
+               BlueprintName = "Sample"
+               ReferencedContainer = "container:Sample.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      buildConfiguration = "Debug">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "05E2128019D4DB510098F589"
+            BuildableName = "Sample.app"
+            BlueprintName = "Sample"
+            ReferencedContainer = "container:Sample.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </TestAction>
+   <LaunchAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Debug"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "05E2128019D4DB510098F589"
+            BuildableName = "Sample.app"
+            BlueprintName = "Sample"
+            ReferencedContainer = "container:Sample.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Release"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "05E2128019D4DB510098F589"
+            BuildableName = "Sample.app"
+            BlueprintName = "Sample"
+            ReferencedContainer = "container:Sample.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
--- a/examples/ASTableViewStressTest/Sample.xcworkspace/contents.xcworkspacedata
+++ b/examples/ASTableViewStressTest/Sample.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1 @@
+<?xml version='1.0' encoding='UTF-8'?><Workspace version='1.0'><FileRef location='group:Sample.xcodeproj'/><FileRef location='group:Pods/Pods.xcodeproj'/></Workspace>
--- a/examples/ASTableViewStressTest/Sample/AppDelegate.h
+++ b/examples/ASTableViewStressTest/Sample/AppDelegate.h
@@ -0,0 +1,18 @@
+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+@property (strong, nonatomic) UIWindow *window;
+
+@end
--- a/examples/ASTableViewStressTest/Sample/AppDelegate.m
+++ b/examples/ASTableViewStressTest/Sample/AppDelegate.m
@@ -0,0 +1,27 @@
+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import "AppDelegate.h"
+
+#import "ViewController.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
+{
+  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  self.window.backgroundColor = [UIColor whiteColor];
+  self.window.rootViewController = [[ViewController alloc] init];
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+@end
--- a/examples/ASTableViewStressTest/Sample/Info.plist
+++ b/examples/ASTableViewStressTest/Sample/Info.plist
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.facebook.AsyncDisplayKit.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
--- a/examples/ASTableViewStressTest/Sample/ViewController.h
+++ b/examples/ASTableViewStressTest/Sample/ViewController.h
@@ -0,0 +1,16 @@
+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface ViewController : UIViewController
+
+@end
--- a/examples/ASTableViewStressTest/Sample/ViewController.m
+++ b/examples/ASTableViewStressTest/Sample/ViewController.m
@@ -0,0 +1,112 @@
+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import "ViewController.h"
+
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+#import <AsyncDisplayKit/ASAssert.h>
+
+#define NumberOfSections 10
+#define NumberOfRowsPerSection 20
+#define NumberOfReloadIterations 50
+
+@interface ViewController () <ASTableViewDataSource, ASTableViewDelegate>
+{
+  ASTableView *_tableView;
+}
+
+@end
+
+
+@implementation ViewController
+
+#pragma mark -
+#pragma mark UIViewController.
+
+- (instancetype)init
+{
+  if (!(self = [super init]))
+    return nil;
+
+  _tableView = [[ASTableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain asyncDataFetching:YES];
+  _tableView.separatorStyle = UITableViewCellSeparatorStyleNone; // KittenNode has its own separator
+  _tableView.asyncDataSource = self;
+  _tableView.asyncDelegate = self;
+
+  return self;
+}
+
+- (void)viewDidLoad
+{
+  [super viewDidLoad];
+
+  [self.view addSubview:_tableView];
+}
+
+- (void)viewWillLayoutSubviews
+{
+  _tableView.frame = self.view.bounds;
+}
+
+- (void)viewDidAppear:(BOOL)animated
+{
+  [super viewDidAppear:animated];
+  
+  [self thrashTableView];
+}
+
+- (void)thrashTableView
+{
+  // Keep the viewport moderately sized so that new cells are loaded on scrolling
+  ASTableView *tableView = [[ASTableView alloc] initWithFrame:CGRectMake(0, 0, 100, 500)
+                                                        style:UITableViewStylePlain
+                                            asyncDataFetching:NO];
+  
+  tableView.asyncDelegate = self;
+  tableView.asyncDataSource = self;
+  
+  [tableView reloadData];
+  
+  [tableView reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(1,2)] withRowAnimation:UITableViewRowAnimationNone];
+  
+  for (int i = 0; i < NumberOfReloadIterations; ++i) {
+    NSInteger randA = arc4random_uniform(NumberOfSections - 1);
+    NSInteger randB = arc4random_uniform(NumberOfSections - 1);
+    
+    [tableView reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(MIN(randA, randB), MAX(randA, randB) - MIN(randA, randB))] withRowAnimation:UITableViewRowAnimationNone];
+    
+    BOOL animated = (arc4random_uniform(1) == 0 ? YES : NO);
+    
+    [tableView setContentOffset:CGPointMake(0, arc4random_uniform(tableView.contentSize.height - tableView.bounds.size.height)) animated:animated];
+    
+    [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01]];
+  }
+}
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
+{
+  return NumberOfSections;
+}
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+  return NumberOfRowsPerSection;
+}
+
+- (ASCellNode *)tableView:(ASTableView *)tableView nodeForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+  ASTextCellNode *textCellNode = [ASTextCellNode new];
+  textCellNode.text = indexPath.description;
+  
+  return textCellNode;
+}
+
+@end
--- a/examples/ASTableViewStressTest/Sample/main.m
+++ b/examples/ASTableViewStressTest/Sample/main.m
@@ -0,0 +1,20 @@
+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import <UIKit/UIKit.h>
+
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+  @autoreleasepool {
+      return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}
				`@@ -0,0 +1 @@`
				`<?xml version='1.0' encoding='UTF-8'?><Workspace version='1.0'><FileRef location='group:Sample.xcodeproj'/><FileRef location='group:Pods/Pods.xcodeproj'/></Workspace>`