Add asyncDataFetchingEnabled as parameter of initializer of ASTableView & ASCollectionView

Conflicts:
	AsyncDisplayKit/ASCollectionView.mm
	AsyncDisplayKit/Details/ASDataController.mm

AsyncDisplayKit/ASCollectionView.h

@@ -34,6 +34,11 @@
  */
 @property (nonatomic, assign) ASRangeTuningParameters rangeTuningParameters;
 
+/**
+ * Initializer.
+ */
+- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout asyncDataFetching:(BOOL)asyncDataFetchingEnabled;
+
 /**
  * Reload everything from scratch, destroying the working range and all cached nodes.
  *

AsyncDisplayKit/ASCollectionView.mm

@@ -101,6 +101,8 @@ static BOOL _isInterceptedSelector(SEL sel)
 
   BOOL _performingBatchUpdates;
   NSMutableArray *_batchUpdateBlocks;
+
+  BOOL _asyncDataFetchingEnabled;
 }
 
 @property (atomic, assign) BOOL asyncDataSourceLocked;
@@ -113,6 +115,11 @@ static BOOL _isInterceptedSelector(SEL sel)
 #pragma mark Lifecycle.
 
 - (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout
+{
+  return [self initWithFrame:frame collectionViewLayout:layout asyncDataFetching:NO];
+}
+
+- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout asyncDataFetching:(BOOL)asyncDataFetchingEnabled
 {
   if (!(self = [super initWithFrame:frame collectionViewLayout:layout]))
     return nil;
@@ -126,13 +133,14 @@ static BOOL _isInterceptedSelector(SEL sel)
   _rangeController.delegate = self;
   _rangeController.layoutController = _layoutController;
 
-  _dataController = [[ASDataController alloc] init];
+  _dataController = [[ASDataController alloc] initWithAsyncDataFetching:asyncDataFetchingEnabled];
   _dataController.delegate = _rangeController;
   _dataController.dataSource = self;
 
   _proxyDelegate = [[_ASCollectionViewProxy alloc] initWithTarget:nil interceptor:self];
   super.delegate = (id<UICollectionViewDelegate>)_proxyDelegate;
 
+  _asyncDataFetchingEnabled = asyncDataFetchingEnabled;
   _asyncDataSourceLocked = NO;
 
   _performingBatchUpdates = NO;

AsyncDisplayKit/ASTableView.h

@@ -34,6 +34,11 @@
  */
 @property (nonatomic, assign) ASRangeTuningParameters rangeTuningParameters;
 
+/**
+ * initializer.
+ */
+- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style asyncDataFetching:(BOOL)asyncDataFetchingEnabled;
+
 /**
  * Reload everything from scratch, destroying the working range and all cached nodes.
  *

AsyncDisplayKit/ASTableView.mm

@@ -110,6 +110,8 @@ static BOOL _isInterceptedSelector(SEL sel)
   ASFlowLayoutController *_layoutController;
 
   ASRangeController *_rangeController;
+
+  BOOL _asyncDataFetchingEnabled;
 }
 
 @property (atomic, assign) BOOL asyncDataSouceLocked;
@@ -123,6 +125,12 @@ static BOOL _isInterceptedSelector(SEL sel)
 
 - (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style
 {
+  return [self initWithFrame:frame style:style asyncDataFetching:NO];
+}
+
+- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style asyncDataFetching:(BOOL)asyncDataFetchingEnabled
+{
+
   if (!(self = [super initWithFrame:frame style:style]))
     return nil;
 
@@ -132,13 +140,14 @@ static BOOL _isInterceptedSelector(SEL sel)
   _rangeController.layoutController = _layoutController;
   _rangeController.delegate = self;
 
-  _dataController = [[ASDataController alloc] init];
+  _dataController = [[ASDataController alloc] initWithAsyncDataFetching:asyncDataFetchingEnabled];
   _dataController.dataSource = self;
   _dataController.delegate = _rangeController;
 
   _proxyDelegate = [[_ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
   super.delegate = (id<UITableViewDelegate>)_proxyDelegate;
 
+  _asyncDataFetchingEnabled = asyncDataFetchingEnabled;
   _asyncDataSouceLocked = NO;
 
   return self;
@@ -168,6 +177,9 @@ static BOOL _isInterceptedSelector(SEL sel)
     _proxyDataSource = nil;
     super.dataSource = nil;
   } else {
+    ASDisplayNodeAssert(!_asyncDataFetchingEnabled || ([asyncDataSource respondsToSelector:@selector(tableViewLockDataSourceForDataUpdating:)] &&
+                                                       [asyncDataSource respondsToSelector:@selector(tableViewUnlockDataSourceForDataUpdating:)]),
+                        @"The asyncDataSource need to implements \"tableViewLockDataSourceForDataUpdating\" and \"tableViewUnlockDataSourceForDataUpdating\" to handle data fetching in async mode.");
     _asyncDataSource = asyncDataSource;
     _proxyDataSource = [[_ASTableViewProxy alloc] initWithTarget:_asyncDataSource interceptor:self];
     super.dataSource = (id<UITableViewDataSource>)_proxyDataSource;

AsyncDisplayKit/Details/ASDataController.h

@@ -119,6 +119,11 @@ typedef NSUInteger ASDataControllerAnimationOptions;
  */
 @property (nonatomic, weak) id<ASDataControllerDelegate> delegate;
 
+/**
+ Designated iniailizer.
+ */
+- (instancetype)initWithAsyncDataFetching:(BOOL)asyncDataFetchingEnabled;
+
 /** @name Initial loading */
 
 - (void)initialDataLoadingWithAnimationOption:(ASDataControllerAnimationOptions)animationOption;

AsyncDisplayKit/Details/ASDataController.mm

@@ -12,11 +12,18 @@
 
 #ifdef ENABLE_ASYNC_DATA_FETCHING
   #define BEGIN_DATA_FETCHING \
-    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{ \
-      [_dataSource dataControllerLockDataSourceForDataUpdating];
+    dispatch_block_t block = ^{
   #define END_DATA_FETCHING \
+    }; \
+    if (_asyncDataFetchingEnabled) { \
+      [_dataSource dataControllerLockDataSourceForDataUpdating]; \
+      dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{ \
+        block(); \
         [_dataSource dataControllerUnlockDataSourceForDataUpdating]; \
-    });
+      }); \
+    } else { \
+      block(); \
+    }
 #else
   #define BEGIN_DATA_FETCHING
   #define END_DATA_FETCHING
@@ -73,6 +80,7 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
 @interface ASDataController () {
   NSMutableArray *_nodes;
   NSMutableArray *_pendingBlocks;
+  BOOL _asyncDataFetchingEnabled;
 }
 
 @property (atomic, assign) NSUInteger batchUpdateCounter;
@@ -81,11 +89,12 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
 
 @implementation ASDataController
 
-- (instancetype)init {
+- (instancetype)initWithAsyncDataFetching:(BOOL)asyncDataFetchingEnabled {
   if (self = [super init]) {
     _nodes = [NSMutableArray array];
     _pendingBlocks = [NSMutableArray array];
     _batchUpdateCounter = 0;
+    _asyncDataFetchingEnabled = asyncDataFetchingEnabled;
   }
 
   return self;
@@ -143,8 +152,7 @@ static void *kASSizingQueueContext = &kASSizingQueueContext;
 
 #pragma mark - Initial Data Loading
 
-- (void)initialDataLoadingWithAnimationOption:(ASDataControllerAnimationOptions)animationOption
-{
+- (void)initialDataLoadingWithAnimationOption:(ASDataControllerAnimationOptions)animationOption {
   BEGIN_DATA_FETCHING
 
   NSMutableArray *indexPaths = [NSMutableArray array];