Scope RCTReloadNotification to one bridge

Summary:
At the moment, posting RCTReloadNotification in any circumstance causes all RCTBridge instances to reload. This change scopes the notification to the bridge for which it was intended.
Closes https://github.com/facebook/react-native/pull/8762

Differential Revision: D3831914

fbshipit-source-id: ff29574f574ecd1a403057ddd0458dea38f0136e

React/Base/RCTBatchedBridge.m

@@ -621,6 +621,11 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithBundleURL:(__unused NSURL *)bundleUR
   [_parentBridge reload];
 }
 
+- (void)requestReload
+{
+  [_parentBridge requestReload];
+}
+
 - (Class)executorClass
 {
   return _parentBridge.executorClass ?: [RCTJSCExecutor class];

React/Base/RCTBridge.h

@@ -21,8 +21,9 @@
 
 /**
  * This notification triggers a reload of all bridges currently running.
+ * Deprecated, use RCTBridge::requestReload instead.
  */
-RCT_EXTERN NSString *const RCTReloadNotification;
+RCT_EXTERN NSString *const RCTReloadNotification DEPRECATED_ATTRIBUTE;
 
 /**
  * This notification fires when the bridge starts loading the JS bundle.
@@ -183,6 +184,11 @@ RCT_EXTERN NSString *RCTBridgeModuleNameForClass(Class bridgeModuleClass);
  */
 - (void)reload;
 
+/**
+ * Inform the bridge, and anything subscribing to it, that it should reload.
+ */
+- (void)requestReload;
+
 /**
  * Says whether bridge has started recieving calls from javascript.
  */

React/Base/RCTBridge.m

@@ -161,21 +161,15 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
 {
   RCTAssertMainQueue();
 
-  [[NSNotificationCenter defaultCenter] addObserver:self
-                                           selector:@selector(reload)
-                                               name:RCTReloadNotification
-                                             object:nil];
-
 #if TARGET_IPHONE_SIMULATOR
   RCTKeyCommands *commands = [RCTKeyCommands sharedInstance];
 
   // reload in current mode
+  __weak typeof(self) weakSelf = self;
   [commands registerKeyCommandWithInput:@"r"
                           modifierFlags:UIKeyModifierCommand
                                  action:^(__unused UIKeyCommand *command) {
-    [[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadNotification
+    [weakSelf requestReload];
-                                                        object:nil
-                                                      userInfo:nil];
   }];
 #endif
 }
@@ -235,6 +229,12 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
   });
 }
 
+- (void)requestReload
+{
+  [[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadNotification object:self];
+  [self reload];
+}
+
 - (void)setUp
 {
   RCT_PROFILE_BEGIN_EVENT(0, @"-[RCTBridge setUp]", nil);

React/Modules/RCTDevMenu.m

@@ -566,9 +566,7 @@ RCT_EXPORT_METHOD(show)
 
 RCT_EXPORT_METHOD(reload)
 {
-  [[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadNotification
+  [_bridge requestReload];
-                                                      object:nil
-                                                    userInfo:nil];
 }
 
 - (void)setShakeToShow:(BOOL)shakeToShow

React/Modules/RCTExceptionsManager.m

@@ -57,7 +57,7 @@ RCT_EXPORT_METHOD(reportFatalException:(NSString *)message
   static NSUInteger reloadRetries = 0;
   if (!RCT_DEBUG && reloadRetries < _maxReloadAttempts) {
     reloadRetries++;
-    [[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadNotification object:nil];
+    [_bridge requestReload];
   } else {
     NSString *description = [@"Unhandled JS Exception: " stringByAppendingString:message];
     NSDictionary *errorInfo = @{ NSLocalizedDescriptionKey: description, RCTJSStackTraceKey: stack };

React/Modules/RCTRedBox.m

@@ -450,7 +450,7 @@ RCT_EXPORT_METHOD(dismiss)
 }
 
 - (void)reloadFromRedBoxWindow:(__unused RCTRedBoxWindow *)redBoxWindow {
-  [[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadNotification object:nil userInfo:nil];
+  [_bridge requestReload];
 }
 
 @end

React/Profiler/RCTProfile.m

@@ -363,8 +363,7 @@ void RCTProfileUnhookModules(RCTBridge *bridge)
 
 + (void)reload
 {
-  [[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadNotification
+  [RCTProfilingBridge() requestReload];
-                                                      object:NULL];
 }
 
 + (void)toggle:(UIButton *)target