Support Handler method from other assembly for ScanForTypes attribute #60

    [ScanForTypes(
        AssignableTo = typeof(ICommandHandler<>),
        Handler = nameof(Extensions.DecorateCommandHandler)
    )]
    [ScanForTypes(
        AssignableTo = typeof(ICommandHandler<,>),
        Handler = nameof(Extensions.DecorateCommandHandlerWithResponse)
    )]
    [ScanForTypes(
        AssignableTo = typeof(IEventHandler<>),
        Handler = nameof(Extensions.DecorateIntegrationEventHandler)
    )]
    private static partial IServiceCollection AddTransactionalProcessing(
        this IServiceCollection services
    );

    [ScanForTypes(
        AssignableTo = typeof(ICommandHandler<>),
        Handler = nameof(Extensions.DecorateCommandHandler)
    )]
    [ScanForTypes(
        AssignableTo = typeof(ICommandHandler<,>),
        Handler = nameof(Extensions.DecorateCommandHandlerWithResponse)
    )]
    [ScanForTypes(
        AssignableTo = typeof(IEventHandler<>),
        Handler = nameof(Extensions.DecorateIntegrationEventHandler)
    )]
    private static partial IServiceCollection AddTransactionalProcessing(
        this IServiceCollection services
    );

public static class Extensions 
{
    public static void DecorateCommandHandler<THandler, TRequest>(IServiceCollection services)
        where THandler : class, ICommandHandler<TRequest>
        where TRequest : class, ICommand =>
        services.Decorate<IRequestHandler<TRequest>, CommandTransactionDecorator<TRequest>>();

    public static void DecorateCommandHandlerWithResponse<THandler, TRequest, TResult>(
        IServiceCollection services
    )
        where THandler : class, ICommandHandler<TRequest, TResult>
        where TRequest : class, ICommand<TResult> =>
        services.Decorate<
            IRequestHandler<TRequest, TResult>,
            CommandWithResponseTransactionDecorator<TRequest, TResult>
        >();

    public static void DecorateIntegrationEventHandler<THandler, TEvent>(
        IServiceCollection services
    )
        where THandler : class, IEventHandler<TEvent>
        where TEvent : BaseIntegrationEvent =>
        services.Decorate<
            INotificationHandler<TEvent>,
            IntegrationEventTransactionDecorator<TEvent>
        >();
}