public static Future <B> Select <A, B>(this Future <A> fa, Fn <A, B> f) => fa.map(f);
public static Future <Option <To> > mapO <From, To>(
this Future <Option <From> > future, Fn <From, To> mapper
)
{
return(future.map(opt => opt.map(mapper)));
}
public static Future <A> flatten <A>(this Future <Future <A> > future) => future.flatMap(_ => _);
public static Future <Option <A> > ofSuccess <A>(this Future <Try <A> > future) => future.map(e => e.value);
public static Future <Option <Exception> > ofFailure <A>(this Future <Try <A> > future) => future.map(e => e.exception);
public void WhenSuccessful()
{
Future <int> .successful(1).map(mapper).shouldBeSuccessful(2);
}
public static Future <Option <A> > extractOpt <A>(this Option <Future <A> > futureOpt) => futureOpt.fold(() => Future.successful(F.none <A>()), f => f.map(F.some));
public static void shouldBeSuccessful <A>(this Future <A> f, A a)
{
f.type.shouldEqual(FutureType.Successful);
f.shouldBeCompleted(a);
}
public static void shouldBeUnfulfilled <A>(this Future <A> f, string message = null)
{
f.type.shouldEqual(FutureType.Unfulfilled, message);
f.value.shouldBeNone($"{message ?? ""}: it shouldn't have a value");
}
public static IEnumerable <Future <A> > addUnfulfilled <A>(this IEnumerable <Future <A> > futures)
{
return(futures.Concat(Future.unfulfilled <A>().Yield()));
}
public void UnfulfilledToASync()
{
unfulfilledShouldNotCallMapper(i => Future.a <int>(p => {}));
}
public static Functional.Lazy <Option <A> > toLazy <A>(this Future <A> f) => F.lazy(() => f.value);
public static Future <C> SelectMany <A, B, C>(this Future <A> fa, Fn <A, Future <B> > f, Fn <A, B, C> g) => fa.flatMap(f, g);
public static Future <B> SelectMany <A, B>(this Future <A> fa, Fn <A, Future <B> > f) => fa.flatMap(f);
void CompleteToComplete()
{
Future.successful(3).collect(i => F.some(i * 2)).shouldBeCompleted(6);
}
public void WhenBothSidesSuccessful()
{
Future.successful(1).zip(Future.successful(2)).shouldBeSuccessful(F.t(1, 2));
}
void NotCompleteToNotComplete()
{
Future.unfulfilled <int>().collect(i => F.none <int>()).shouldNotBeCompleted();
Future.unfulfilled <int>().collect(F.some).shouldNotBeCompleted();
}
public static void shouldBeCompleted <A>(this Future <A> f, A a)
{
f.value.shouldBeSome(a, "it should have a value");
}
public static Future <A> extract <A>(this Future <Option <A> > optFuture) => optFuture.flatMap(opt => opt.fold(Future <A> .unfulfilled, Future.successful));
public static void shouldNotBeCompleted <A>(this Future <A> f)
{
f.value.shouldBeNone("it should not have a value");
}
public static Future <Option <B> > ofSuccess <A, B>(this Future <Either <A, B> > future) => future.map(e => e.rightValue);
public void CompleteToNotComplete()
{
Future.successful(3).filter(i => false).shouldNotBeCompleted();
}
public static Future <Option <A> > ofFailure <A, B>(this Future <Either <A, B> > future) => future.map(e => e.leftValue);
void CompleteToComplete()
{
Future.successful(3).filter(i => true).shouldBeCompleted(3);
}
public static LazyVal <Option <A> > toLazy <A>(this Future <A> f) => F.lazy(() => f.value);
void NotCompleteToNotComplete()
{
Future.unfulfilled <int>().filter(i => false).shouldNotBeCompleted();
Future.unfulfilled <int>().filter(i => true).shouldNotBeCompleted();
}
public static Future <Either <Err, To> > mapE <From, To, Err>(
this Future <Either <Err, From> > future, Fn <From, To> mapper
)
{
return(future.map(e => e.mapRight(mapper)));
}
public void CompleteToNotComplete()
{
Future.successful(3).collect(i => F.none <int>()).shouldNotBeCompleted();
}
/** Complete the future with the right side, never complete if left side occurs. **/ public static Future <B> dropError <A, B>(this Future <Either <A, B> > future) => Future.a <B>(p => future.onSuccess(p.complete));
public static ASyncNAtATimeQueue <Params, Return> a <Params, Return>(
Act <Params, Promise <Return> > execute, ushort maxTasks = 1
) => new ASyncNAtATimeQueue <Params, Return>(
maxTasks,
p => Future <Return> .async(promise => execute(p, promise))
);
