Flutter workmanager with BLOC and repository pattern - flutter

Question

I use bloc and with repository pattern. There was a need to execute the code in the background according to the schedule, for this I use workmanager The problem is that the workmanager is executed in a separate method, which is initialized outside the main method, and it does not know anything about the context or the code below like MyApp
#pragma('vm:entry-point')
void callbackDispatcher() {
Workmanager().executeTask((taskName, inputData) {
//How i can access bloc or repository from here?
return Future.value(true);
});
}
void main() async {
Workmanager().initialize(callbackDispatcher, isInDebugMode: true);
Workmanager().registerPeriodicTask('uniqueName', 'taskName',
constraints: Constraints(
networkType: NetworkType.connected,
requiresBatteryNotLow: true,
),
frequency: const Duration(minutes: 5));
}
Workmanager is initialized at the very beginning of the main method and before runApp MyApp, it has no context, and my repository and bloc have not even been created yet. I can’t figure out how to access the bloc from the workmanager.

Answer 1

You can pass the instances of repository and bloc as input data when registering the periodic task and then access them in the callbackDispatcher method:
final Repository _repository = Repository();
final Bloc _bloc = Bloc();
void main() async {
Workmanager().initialize(callbackDispatcher, isInDebugMode: true);
Workmanager().registerPeriodicTask('uniqueName', 'taskName',
inputData: {'repository': _repository, 'bloc': _bloc},
constraints: Constraints(
networkType: NetworkType.connected,
requiresBatteryNotLow: true,
),
frequency: const Duration(minutes: 5));
runApp(MyApp());
}
#pragma('vm:entry-point')
void callbackDispatcher() {
Workmanager().executeTask((taskName, inputData) {
final Repository repository = inputData['repository'];
final Bloc bloc = inputData['bloc'];
// Use repository and bloc as needed
return Future.value(true);
});
}
You can also use a singleton pattern for your repository and bloc classes:
class Repository {
static final Repository _singleton = Repository._internal();
factory Repository() {
return _singleton;
}
Repository._internal();
// Repository methods
}
class Bloc {
static final Bloc _singleton = Bloc._internal();
factory Bloc() {
return _singleton;
}
Bloc._internal();
// Bloc methods
}
void main() async {
Repository();
Bloc();
Workmanager().initialize(callbackDispatcher, isInDebugMode: true);
Workmanager().registerPeriodicTask('uniqueName', 'taskName',
constraints: Constraints(
networkType: NetworkType.connected,
requiresBatteryNotLow: true,
),
frequency: const Duration(minutes: 5));
runApp(MyApp());
}
#pragma('vm:entry-point')
void callbackDispatcher() {
Workmanager().executeTask((taskName, inputData) {
final Repository repository = Repository();
final Bloc bloc = Bloc();
// Use repository and bloc as needed
return Future.value(true);
});
}