Merge allowOffMainQueueRegistration and requiresMainQueueSetup

Reviewed By: fromcelticpark

Differential Revision: D5398021

fbshipit-source-id: 7e721cce579678f4c82582f5068cf46574afe961

React/Base/RCTModuleData.h

@@ -58,27 +58,14 @@ typedef id<RCTBridgeModule>(^RCTBridgeModuleProvider)(void);
 
 /**
  * Returns YES if module instance must be created on the main thread.
- * May be overriden by "allowOffMainQueueRegistration".
  */
-@property (nonatomic, assign, readonly) BOOL requiresMainQueueSetup;
+@property (nonatomic, assign) BOOL requiresMainQueueSetup;
 
 /**
  * Returns YES if module has constants to export.
- * May be overriden by "allowOffMainQueueRegistration".
  */
 @property (nonatomic, assign, readonly) BOOL hasConstantsToExport;
 
-/**
- * If set to YES, it will force both setup and constants export process
- * to explicitly happen off the main queue.
- * Overrides "requiresMainQueueSetup" & "hasConstantsToExport"
- * Defaults to NO.
- *
- * @experimental
- */
-
-@property (nonatomic, assign) BOOL allowOffMainQueueRegistration;
-
 /**
  * Returns the current module instance. Note that this will init the instance
  * if it has not already been created. To check if the module instance exists

React/Base/RCTModuleData.mm

@@ -44,14 +44,15 @@ - (void)setUp
     objectInitMethod = [NSObject instanceMethodForSelector:@selector(init)];
   });
 
-  // If a module overrides `init` then we must assume that it expects to be
-  // initialized on the main thread, because it may need to access UIKit.
-  _requiresMainQueueSetup = !_instance &&
-  [_moduleClass instanceMethodForSelector:@selector(init)] != objectInitMethod;
-
   // If a module overrides `constantsToExport` then we must assume that it
   // must be called on the main thread, because it may need to access UIKit.
   _hasConstantsToExport = [_moduleClass instancesRespondToSelector:@selector(constantsToExport)];
+
+  // If a module overrides `init` then we must assume that it expects to be
+  // initialized on the main thread, because it may need to access UIKit.
+  const BOOL hasCustomInit = !_instance && [_moduleClass instanceMethodForSelector:@selector(init)] != objectInitMethod;
+
+  _requiresMainQueueSetup = _hasConstantsToExport || hasCustomInit;
 }
 
 - (instancetype)initWithModuleClass:(Class)moduleClass
@@ -101,7 +102,7 @@ - (void)setUpInstanceAndBridge
 
     if (!_setupComplete && _bridge.valid) {
       if (!_instance) {
-        if (RCT_DEBUG && _requiresMainQueueSetup && !_allowOffMainQueueRegistration) {
+        if (RCT_DEBUG && _requiresMainQueueSetup) {
           RCTAssertMainQueue();
         }
         RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"[RCTModuleData setUpInstanceAndBridge] Create module", nil);
@@ -222,7 +223,7 @@ - (BOOL)hasInstance
 {
   if (!_setupComplete) {
     RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, ([NSString stringWithFormat:@"[RCTModuleData instanceForClass:%@]", _moduleClass]), nil);
-    if (_requiresMainQueueSetup && !_allowOffMainQueueRegistration) {
+    if (_requiresMainQueueSetup) {
       // The chances of deadlock here are low, because module init very rarely
       // calls out to other threads, however we can't control when a module might
       // get accessed by client code during bridge setup, and a very low risk of
@@ -295,7 +296,7 @@ - (void)gatherConstants
   if (_hasConstantsToExport && !_constantsToExport) {
     RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, ([NSString stringWithFormat:@"[RCTModuleData gatherConstants] %@", _moduleClass]), nil);
     (void)[self instance];
-    if (_allowOffMainQueueRegistration) {
+    if (!_requiresMainQueueSetup) {
       _constantsToExport = [_instance constantsToExport] ?: @{};
     } else {
       if (!RCTIsMainQueue()) {

React/CxxBridge/RCTCxxBridge.mm

@@ -651,7 +651,7 @@ - (void)_prepareModulesWithDispatchGroup:(dispatch_group_t)dispatchGroup
       continue;
     }
 
-    if (moduleData.requiresMainQueueSetup || moduleData.hasConstantsToExport) {
+    if (moduleData.requiresMainQueueSetup) {
       // Modules that need to be set up on the main thread cannot be initialized
       // lazily when required without doing a dispatch_sync to the main thread,
       // which can result in deadlock. To avoid this, we initialize all of these