Merge pull request #228 from kareemabdeen/enhancement/add-bloc-observer-logging-to-core-of-app

Enhance Application Insights by Integrating BlocObserverLogger for Real-Time Monitoring in main.dart ✅

Author: mdmohsin7

lib/main.dart

@@ -11,6 +11,7 @@ import 'package:flutter_screenutil/flutter_screenutil.dart';
 import 'package:monumento/presentation/authentication/login_view.dart';
 import 'package:monumento/service_locator.dart';
 import 'package:monumento/utils/app_colors.dart';
+import 'package:monumento/utils/bloc_observer_logger.dart';
 import 'package:responsive_framework/responsive_framework.dart';
 
 import 'application/authentication/authentication_bloc.dart';
@@ -28,6 +29,7 @@ void main() async {
   }
   await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
   setupLocator();
+  Bloc.observer = BlocObserverLogger();
 
   // runApp(MyApp());
 
@@ -85,11 +87,10 @@ class MyApp extends StatelessWidget {
       scrollBehavior: NoThumbScrollBehavior().copyWith(scrollbars: false),
       title: 'Monumento',
       theme: ThemeData(
-        useMaterial3: false,
-        tabBarTheme: TabBarTheme(
-          indicatorColor: AppColor.appPrimary,
-        )
-      ),
+          useMaterial3: false,
+          tabBarTheme: TabBarTheme(
+            indicatorColor: AppColor.appPrimary,
+          )),
       builder: (context, child) {
         return DevicePreview.appBuilder(
           context,

lib/utils/bloc_observer_logger.dart

@@ -0,0 +1,48 @@
+import 'dart:developer';
+
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+/// A logger for observing and logging state changes and activities in Blocs/Cubits.
+class BlocObserverLogger extends BlocObserver {
+  /// Logs every change in the state of any Bloc/Cubit.
+  @override
+  void onChange(BlocBase bloc, Change change) {
+    super.onChange(bloc, change);
+    log('onChange: ${bloc.runtimeType}, Prev State: ${change.currentState}, Next State: ${change.nextState}');
+  }
+
+  /// Logs when a Bloc/Cubit is closed.
+  @override
+  void onClose(BlocBase bloc) {
+    super.onClose(bloc);
+    log('onClose: ${bloc.runtimeType}');
+  }
+
+  /// Logs when a Bloc/Cubit is created.
+  @override
+  void onCreate(BlocBase bloc) {
+    super.onCreate(bloc);
+    log('onCreate: ${bloc.runtimeType}');
+  }
+
+  /// Logs events added to the Bloc.
+  @override
+  void onEvent(Bloc bloc, Object? event) {
+    super.onEvent(bloc, event);
+    log('onEvent: ${bloc.runtimeType}, Event: $event');
+  }
+
+  /// Logs errors caught in the Bloc/Cubit.
+  @override
+  void onError(BlocBase bloc, Object error, StackTrace stackTrace) {
+    super.onError(bloc, error, stackTrace);
+    log('onError: ${bloc.runtimeType}, Error: $error');
+  }
+
+  /// Logs state transitions in the Bloc.
+  @override
+  void onTransition(Bloc bloc, Transition transition) {
+    super.onTransition(bloc, transition);
+    log('onTransition: ${bloc.runtimeType}, Transition: $transition');
+  }
+}