klizma 0.2.1 klizma: ^0.2.1 copied to clipboard
A minimalistic Dependency Injection and Service Locator implementation in Dart.
klizma #
A minimalistic DI (Dependency Injection) container for Dart. Inspired by injector.
- Extra lightweight
- No external dependencies
- Supports singletons and named factories
import 'package:klizma/klizma.dart';
void main() {
// Create the DI container:
final di = Klizma();
// Add a factory for type `Engine`:
di.provide((_) => Engine('Vroom!'));
// Add a named factory for type `Engine`:
di.provide((_) => Engine('Whoosh!'), name: 'electric');
// Add a factory for type `Horn`:
di.provide((_) => Horn('Honk!'));
// Add a factory for type `Car` using default instances of `Engine` and `Horn`:
di.provide((_) => Car(_<Engine>(), _<Horn>()));
// Add a named factory for type `Car` using the named factory for `Engine`
// and the default factory for `Horn`:
di.provide((_) => Car(_<Engine>('electric'), _<Horn>()), name: 'tesla');
// Build an instance of type `Car`
final car = di.get<Car>();
/*
Prints the following:
=====================
Engine created.
Horn created.
Car created.
*/
print(car.sound); // Vroom! Honk!
final tesla = di.get<Car>('tesla');
/*
Prints the following. Note that the horn is reused:
=====================
Engine created.
Car created.
*/
print(tesla.sound); // Whoosh! Honk!
}
class Engine {
Engine(this.sound) {
print('Engine created.');
}
final String sound;
}
class Horn {
Horn(this.sound) {
print('Horn created.');
}
final String sound;
}
class Car {
Car(this.engine, this.horn) {
print('Car created.');
}
final Engine engine;
final Horn horn;
String get sound => '${engine.sound} ${horn.sound}';
}