life cycle control logic only dependends on GetLifeCycle and not in the implementations

@@ -19,7 +19,10 @@ class HomeController extends GetxController {
 
   /// When the controller is initialized, make the http request
   @override
-  void onInit() => fetchDataFromApi();
+  void onInit() {
+    super.onInit();
+    fetchDataFromApi();
+  }
 
   /// fetch cases from Api
   Future<void> fetchDataFromApi() async {

@@ -4,24 +4,32 @@ import 'package:flutter/material.dart';
 /// overrides if you extend the class that uses it, as Dart has no final
 /// methods.
 /// Used in [DisposableInterface] to avoid the danger of overriding onStart.
-///
 class _InternalFinalCallback<T> {
-  T Function() callback;
-
-  _InternalFinalCallback({this.callback});
-
-  T call() => callback.call();
-}
+  ValueGetter<T> _callback;
 
-class _InternalFinalPrivateCallback<T> {
-  T Function() _callback;
-
-  _InternalFinalPrivateCallback();
+  _InternalFinalCallback({ValueGetter<T> callback}) : _callback = callback;
 
   T call() => _callback.call();
 }
 
+/// The [GetLifeCycle]
+///
+/// ```dart
+/// class SomeController with GetLifeCycle {
+///   SomeController() {
+///     initLifeCycle();
+///   }
+/// }
+/// ```
 mixin GetLifeCycle {
+  /// The `initLifeCycle` works as a constructor for the [GetLifeCycle]
+  ///
+  /// This method must be invoked in the constructor of the implementation
+  void initLifeCycle() {
+    onStart._callback = _onStart;
+    onDelete._callback = _onDelete;
+  }
+
   /// Called at the exact moment the widget is allocated in memory.
   /// It uses an internal "callable" type, to avoid any @overrides in subclases.
   /// This method should be internal and is required to define the
@@ -29,14 +37,12 @@ mixin GetLifeCycle {
   final onStart = _InternalFinalCallback<void>();
 
   /// Internal callback that starts the cycle of this controller.
-  final onDelete = _InternalFinalPrivateCallback<void>();
+  final onDelete = _InternalFinalCallback<void>();
 
   /// Called immediately after the widget is allocated in memory.
   /// You might use this to initialize something for the controller.
   @mustCallSuper
-  void onInit() {
-    onDelete._callback = _onDelete;
-  }
+  void onInit() {}
 
   /// Called 1 frame after onInit(). It is the perfect place to enter
   /// navigation events, like snackbar, dialogs, or a new route, or
@@ -51,6 +57,18 @@ mixin GetLifeCycle {
   /// Might be useful as well to persist some data on disk.
   void onClose() {}
 
+  bool _initialized = false;
+
+  /// Checks whether the controller has already been initialized.
+  bool get initialized => _initialized;
+
+  // Internal callback that starts the cycle of this controller.
+  void _onStart() {
+    if (_initialized) return;
+    onInit();
+    _initialized = true;
+  }
+
   bool _isClosed = false;
 
   /// Checks whether the controller has already been closed.

@@ -11,28 +11,18 @@ import '../../../get_instance/src/lifecycle.dart';
 abstract class GetxService extends DisposableInterface with GetxServiceMixin {}
 
 abstract class DisposableInterface with GetLifeCycle {
-  bool _initialized = false;
-
-  /// Checks whether the controller has already been initialized.
-  bool get initialized => _initialized;
-
   DisposableInterface() {
-    onStart.callback = _onStart;
-  }
-
-  // Internal callback that starts the cycle of this controller.
-  void _onStart() {
-    if (_initialized) return;
-    onInit();
-    _initialized = true;
-    SchedulerBinding.instance?.addPostFrameCallback((_) => onReady());
+    initLifeCycle();
   }
 
   /// Called immediately after the widget is allocated in memory.
   /// You might use this to initialize something for the controller.
   @override
   @mustCallSuper
-  void onInit() => super.onInit();
+  void onInit() {
+    super.onInit();
+    SchedulerBinding.instance?.addPostFrameCallback((_) => onReady());
+  }
 
   /// Called 1 frame after onInit(). It is the perfect place to enter
   /// navigation events, like snackbar, dialogs, or a new route, or
@@ -48,6 +38,5 @@ abstract class DisposableInterface with GetLifeCycle {
   /// like TextEditingControllers, AnimationControllers.
   /// Might be useful as well to persist some data on disk.
   @override
-  @mustCallSuper
   void onClose() {}
 }

@@ -38,20 +38,14 @@ typedef Condition = bool Function();
 
 abstract class GetNotifier<T> extends Value<T> with GetLifeCycle {
   GetNotifier(T initial) : super(initial) {
-    onStart.callback = _onStart;
+    initLifeCycle();
     _fillEmptyStatus();
   }
 
-  bool _initialized = false;
-
-  /// Checks whether the controller has already been initialized.
-  bool get initialized => _initialized;
-
-  // Internal callback that starts the cycle of this controller.
-  void _onStart() {
-    if (_initialized) return;
-    onInit();
-    _initialized = true;
+  @override
+  @mustCallSuper
+  void onInit() {
+    super.onInit();
     SchedulerBinding.instance?.addPostFrameCallback((_) => onReady());
   }