modular_shelf

Description:

modular shelf

About #
A dependency injection system for shelf, heavily based on the dependency declaration syntax of
flutter_modular and nestjs
Usage #
Define our Usecases/Providers/Dependencies #
class SumUsecase {
const SumUsecase();

int sum(int a, int b) => a + b;
}

class SubtractionUsecase {
const SubtractionUsecase();

int subtraction(int a, int b) => a - b;
}

class MathUsecase {
final SumUsecase sumUsecase;
final SubtractionUsecase subtractionUsecase;

const MathUsecase(this.sumUsecase, this.subtractionUsecase);

int sum(int a, int b) => sumUsecase.sum(a, b);

int subtraction(int a, int b) => subtractionUsecase.subtraction(a, b);
}
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Define our Controllers #
class TestController extends ShelfController {
final MathUsecase mathUsecase;

TestController(Router serverRouter, {required this.mathUsecase})
: super(serverRouter, '/test/');

@override
Router get router => Router();

int testSum(int a, int b) => mathUsecase.sum(a, b);

int testSubtraction(int a, int b) => mathUsecase.subtraction(a, b);
}

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Define our Module #
class TestModule extends ShelfModule {
TestModule(Router serverRouter)
: super(
router: serverRouter,
controllers: getControllers(),
providers: getProviders(),
);

static Map<Type, InstanceFactory<Object>> getProviders() {
return {
SumUsecase: (_) => SumUsecase(),
SubtractionUsecase: (_) => SubtractionUsecase(),
MathUsecase: (dependencyManager) {
final sumUsecase = dependencyManager.get<SumUsecase>();
final subtractionUsecase = dependencyManager.get<SubtractionUsecase>();
return MathUsecase(
sumUsecase,
subtractionUsecase,
);
}
};
}

static Set<ShelfControllerFactory> getControllers() {
return {
(router, dependencyManager) {
return TestController(
router,
mathUsecase: dependencyManager.get<MathUsecase>(),
);
}
};
}
}

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Usage #
void main() async {
final router = Router();

final shelfApp = await ShelfApp({
TestModule(router),
}).mount();

final module = await shelfApp.getModule<TestModule>();
final controller = await module.getController<TestController>();

print(controller.testSum(1, 1));
print(controller.testSubtraction(1, 1));
}

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