Clean Architectureintermediate

UseCase Base Class

Abstract base class for use cases following Clean Architecture. Handles single input/output with Either for error handling.

#clean-architecture#use-case#either

dart

1 import 'package:dartz/dartz.dart';
2  
3 abstract class UseCase<Type, Params> {
4   Future<Either<Failure, Type>> call(Params params);
5 }
6  
7 // For use cases with no parameters
8 class NoParams {
9   const NoParams();
10 }
11  
12 // Example Failure class
13 abstract class Failure {
14   final String message;
15   const Failure(this.message);
16 }
17  
18 class ServerFailure extends Failure {
19   const ServerFailure([super.message = 'Server error occurred']);
20 }
21  
22 class CacheFailure extends Failure {
23   const CacheFailure([super.message = 'Cache error occurred']);
24 }

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1	import 'package:dartz/dartz.dart';
2
3	abstract class UseCase<Type, Params> {
4	Future<Either<Failure, Type>> call(Params params);
5	}
6
7	// For use cases with no parameters
8	class NoParams {
9	const NoParams();
10	}
11
12	// Example Failure class
13	abstract class Failure {
14	final String message;
15	const Failure(this.message);
16	}
17
18	class ServerFailure extends Failure {
19	const ServerFailure([super.message = 'Server error occurred']);
20	}
21
22	class CacheFailure extends Failure {
23	const CacheFailure([super.message = 'Cache error occurred']);
24	}