Re: Filter on future doesn't make sense
Oliver Ruebenacker <[email protected]> Fri, 1 Jul 2016 09:18:13 -0400
| Newsgroups | gmane.comp.lang.scala |
|---|---|
| Message-ID | <CAA=X4OC8M0G4Yx2Nf=ua8XhkzrzLze23-1F6A-TyCsir6dJ4ow@mail.gmail.com> |
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Hello Roland,
Option has get, getOrElse and the possibility to match against
Some(value), but Future does not have these.
Best, Oliver
On Fri, Jul 1, 2016 at 9:06 AM, Roland Kuhn <[email protected]> wrote:
> The difference is that Option does not have onComplete: if you restrict
> yourself to the Option API then Future behaves observably in the same way=
.
> If you want to have something like onComplete you should look at Either[N=
oSuchElementException,
> T]#fold.
>
> In general there is no .filter on monads because that would require the
> explicit ability to represent emptiness (which is not part of the
> contract); the success path for the combinators could be seen as such a
> representation and it is indeed often used as such, so Future is quite
> well-behaved in this regard. Another comment I=E2=80=99d like to make on =
the
> discussed change is that it is not reasonable to expect that the result o=
f
> filtering returns a different type than the original one=E2=80=94no other=
container
> has this behavior.
>
> Regards,
>
> Roland
>
>
> 1 juli 2016 kl. 14:54 skrev Oliver Ruebenacker <[email protected]>:
>
>
> Hello,
>
> Looks like sometimes you do get an exception:
>
>
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>
> *Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java
> 1.8.0_45).Type in expressions for evaluation. Or try :help.scala> import
> scala.concurrent.Futureimport scala.concurrent.Futurescala> import
> scala.concurrent.ExecutionContext.Implicits.globalimport
> scala.concurrent.ExecutionContext.Implicits.globalscala>
> Future{1}.onComplete { case _ =3D> println("Complete!") }scala>
> Complete!scala> Future{1}.filter(_ =3D=3D 0).onComplete { case _ =3D>
> println("Complete!") }Complete!scala> import scala.util.{Success, Failure
> }import scala.util.{Success, Failure}scala> Future{1}.filter(_ =3D=3D
> 0).onComplete { | case Success(value) =3D> println(value) | case
> Failure(ex) =3D> println(ex) | }java.util.NoSuchElementException:
> Future.filter predicate is not satisfiedscala>*
>
> Best, Oliver
>
>
> On Fri, Jul 1, 2016 at 5:44 AM, Viktor Klang <[email protected]>
> wrote:
>
>> I think you are conflating the notion of optionality here.
>>
>> option.filter(p).map(f).foreach(println)
>>
>> behaves exactly like
>>
>> future.filter(p).map(f).foreach(println)
>>
>> --
>> Cheers,
>> =E2=88=9A
>> On Jul 1, 2016 11:36 AM, "Avi Levi" <[email protected]> wrote:
>>
>>> Correct, just on future you get an exception if element does not pass
>>> the filter. Wouldn't it be better if we can get something that express =
an
>>> empty future?
>>> On Jul 1, 2016 12:30 PM, "Viktor Klang" <[email protected]> wrote:
>>>
>>>> But you don't get an exception on the success path. All operations on
>>>> the success path will be skipped, just as for Option.
>>>>
>>>> --
>>>> Cheers,
>>>> =E2=88=9A
>>>> On Jul 1, 2016 10:35 AM, "Avi Levi" <[email protected]> wrote:
>>>>
>>>>> Hi Victor ,
>>>>> I totally agree that expectations are subjective .
>>>>> But like you said a filter on List will return a List if no element
>>>>> comply than we will get Nil which represents an empty container (empt=
y list)
>>>>> a filter on option will return a option if the element doesn't comply
>>>>> than we will get None which represents an empty container
>>>>> following the same logic a filter on future should return something
>>>>> that express empty container , defiantly not an exception, because it=
is
>>>>> not an exception we do intend to filter those elements.
>>>>>
>>>>>
>>>>>
>>>>> 2016-07-01 10:50 GMT+03:00 Viktor Klang <[email protected]>:
>>>>>
>>>>>> Hi Avi,
>>>>>>
>>>>>> I see what you mean.
>>>>>>
>>>>>> I'd want to avoid discussing expectation since it is subjective. I
>>>>>> will however note that the actualnsemantics of the filter method on =
Future
>>>>>> needs improvement:
>>>>>> http://www.scala-lang.org/api/2.11.8/index.html#scala.concurrent.Fut=
ure@filter(p:T=3D
>>>>>> >Boolean)(implicitexecutor:scala.concurrent.ExecutionContext):scala.=
concurrent.Future[T]
>>>>>>
>>>>>> As for might not return the value, the same goes for all
>>>>>> filter-methods:
>>>>>>
>>>>>> List returns List, but it might not have any elements at all. Option
>>>>>> returns Option but can be Some or None, Future is either Success or =
Failure.
>>>>>>
>>>>>> If success has an optionality aspect in your usage, use Future of
>>>>>> Option to express that, that would be my recommendation.
>>>>>>
>>>>>> --
>>>>>> Cheers,
>>>>>> =E2=88=9A
>>>>>> On Jul 1, 2016 9:20 AM, "Avi Levi" <[email protected]> wrote:
>>>>>>
>>>>>>> Thanks Victor,
>>>>>>> Of course it can be implemented as you suggested. But still I can
>>>>>>> argue that the current implementation is not "really filtering" the=
results
>>>>>>> as one might expect and less expressive if it might or not return t=
he value
>>>>>>> than Option is more expressive, don't you agree?
>>>>>>> On Jul 1, 2016 10:06 AM, "Viktor Klang" <[email protected]>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi Avi,
>>>>>>>>
>>>>>>>> Use Fututre[Option[Int]] if you want to deal with Some/None as a
>>>>>>>> result of filter ( f.map(_.filter(p) ) (alt. see monad transformer=
s)
>>>>>>>>
>>>>>>>> --
>>>>>>>> Cheers,
>>>>>>>> =E2=88=9A
>>>>>>>> On Jul 1, 2016 8:53 AM, "Avi Levi" <[email protected]> wrote:
>>>>>>>>
>>>>>>>> I was trying to figure out what should I accept when filtering ove=
r
>>>>>>>> a future .
>>>>>>>> the current implementation yields either a T or an exception which
>>>>>>>> kind of breaks referential transparency (doesn't it ?) .
>>>>>>>> on the other hand what can I expect given this expression
>>>>>>>>
>>>>>>>> *def foo(i:Int):Future[Int]*
>>>>>>>>
>>>>>>>> the type result of
>>>>>>>>
>>>>>>>> *foo(1).filter(_ % 2 =3D=3D 0)*
>>>>>>>>
>>>>>>>>
>>>>>>>> I.M.H.O I would expect it to yield Option[T] which makes more
>>>>>>>> sense to express that we might get a value that pass the filter or=
not . is
>>>>>>>> that make sense ?
>>>>>>>>
>>>>>>>> Cheers
>>>>>>>> Avi
>>>>>>>>
>>>>>>>> --
>>>>>>>> You received this message because you are subscribed to the Google
>>>>>>>> Groups "scala-language" group.
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>>>>>>>>
>>>>>>>
>>>>>>> --
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>>>>>> --
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>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Sincerely,
>>>>> Avi Levi
>>>>> m: +972-52-3459959
>>>>> <https://www.linkedin.com/in/leviavi>
>>>>> https://about.me/avi.levi
>>>>>
>>>>> --
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>>>
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>
>
>
> --
> Oliver Ruebenacker
> Senior Software Engineer, Diabetes Portal
> <http://www.type2diabetesgenetics.org/>, Broad Institute
> <http://www.broadinstitute.org/>
>
>
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--=20
Oliver Ruebenacker
Senior Software Engineer, Diabetes Portal
<http://www.type2diabetesgenetics.org/>, Broad Institute
<http://www.broadinstitute.org/>
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--001a1147da48aafd6a053692d1f9
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<div dir=3D"ltr"><div><div><div><br></div>=C2=A0=C2=A0=C2=A0=C2=A0 Hello Ro=
land,<br><br></div>=C2=A0 Option has get, getOrElse and the possibility to =
match against Some(value), but Future does not have these.<br><br></div>=C2=
=A0=C2=A0=C2=A0=C2=A0 Best, Oliver<br></div><div class=3D"gmail_extra"><br>=
<div class=3D"gmail_quote">On Fri, Jul 1, 2016 at 9:06 AM, Roland Kuhn <spa=
n dir=3D"ltr"><<a href=3D"mailto:[email protected]" target=3D"_blank">go=
[email protected]</a>></span> wrote:<br><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><di=
v style=3D"word-wrap:break-word">The difference is that Option does not hav=
e onComplete: if you restrict yourself to the Option API then Future behave=
s observably in the same way. If you want to have something like onComplete=
you should look at <font face=3D"Courier">Either[NoSuchElementException, T=
]#fold</font>.<div><br></div><div>In general there is no .filter on monads =
because that would require the explicit ability to represent emptiness (whi=
ch is not part of the contract); the success path for the combinators could=
be seen as such a representation and it is indeed often used as such, so F=
uture is quite well-behaved in this regard. Another comment I=E2=80=99d lik=
e to make on the discussed change is that it is not reasonable to expect th=
at the result of filtering returns a different type than the original one=
=E2=80=94no other container has this behavior.</div><div><br></div><div>Reg=
ards,</div><div><br></div><div>Roland<div><div class=3D"h5"><br><div><br><d=
iv><blockquote type=3D"cite"><div>1 juli 2016 kl. 14:54 skrev Oliver Rueben=
acker <<a href=3D"mailto:[email protected]" target=3D"_blank">curoli@gmai=
l.com</a>>:</div><br><div><div dir=3D"ltr"><div><div><br></div>=C2=A0=C2=
=A0=C2=A0=C2=A0 Hello,<br><br></div>=C2=A0 Looks like sometimes you do get =
an exception:<br><div><div><br><b><span style=3D"font-family:monospace,mono=
space">Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8=
.0_45).<br>Type in expressions for evaluation. Or try :help.<br><br>scala&g=
t; import scala.concurrent.Future<br>import scala.concurrent.Future<br><br>=
scala> import scala.concurrent.ExecutionContext.Implicits.global<br>impo=
rt scala.concurrent.ExecutionContext.Implicits.global<br><br>scala> Futu=
re{1}.onComplete { case _ =3D> println("Complete!") }<br><br>s=
cala> Complete!<br><br><br>scala> Future{1}.filter(_ =3D=3D 0).onComp=
lete { case _ =3D> println("Complete!") }<br>Complete!<br><br>=
scala> import scala.util.{Success, Failure }<br>import scala.util.{Succe=
ss, Failure}<br><br>scala> Future{1}.filter(_ =3D=3D 0).onComplete {<br>=
=C2=A0=C2=A0=C2=A0=C2=A0 | case Success(value) =3D> println(value)<br>=
=C2=A0=C2=A0=C2=A0=C2=A0 | case Failure(ex) =3D> println(ex)<br>=C2=A0=
=C2=A0=C2=A0=C2=A0 | }<br><br>java.util.NoSuchElementException: Future.filt=
er predicate is not satisfied<br>scala></span></b><br><br></div><div>=C2=
=A0=C2=A0=C2=A0=C2=A0 Best, Oliver<br></div><div><br></div></div></div><div=
class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Fri, Jul 1, 2016 a=
t 5:44 AM, Viktor Klang <span dir=3D"ltr"><<a href=3D"mailto:viktor.klan=
[email protected]" target=3D"_blank">[email protected]</a>></span> wrote:=
<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex"><p dir=3D"ltr">I think you are conflatin=
g the notion of optionality here.</p><p dir=3D"ltr">option.filter(p).map(f)=
.foreach(println)</p><p dir=3D"ltr">behaves exactly like</p><p dir=3D"ltr">=
future.filter(p).map(f).foreach(println)</p><span><font color=3D"#888888"><=
p dir=3D"ltr">-- <br>
Cheers,<br>
=E2=88=9A</p></font></span><div><div>
<div class=3D"gmail_quote">On Jul 1, 2016 11:36 AM, "Avi Levi" &l=
t;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a=
>> wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir=
=3D"ltr">Correct, just on future you get an exception if element does not p=
ass the filter. Wouldn't it be better if we can get something that expr=
ess an empty future? </p>
<div class=3D"gmail_quote">On Jul 1, 2016 12:30 PM, "Viktor Klang"=
; <<a href=3D"mailto:[email protected]" target=3D"_blank">viktor.kl=
[email protected]</a>> wrote:<br type=3D"attribution"><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex"><p dir=3D"ltr">But you don't get an exception on the success p=
ath. All operations on the success path will be skipped, just as for Option=
.</p><p dir=3D"ltr">-- <br>
Cheers,<br>
=E2=88=9A</p>
<div class=3D"gmail_quote">On Jul 1, 2016 10:35 AM, "Avi Levi" &l=
t;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a=
>> wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div di=
r=3D"rtl"><div dir=3D"ltr">Hi Victor ,</div><div dir=3D"ltr">I totally agre=
e that expectations are subjective .</div><div dir=3D"ltr">But like you sai=
d a filter on List will return a List if no element comply than we will get=
Nil which represents an empty container (empty list)</div><div dir=3D"ltr"=
>a filter on option will return a option if the element doesn't comply =
than we will get None which represents an empty container=C2=A0</div><div d=
ir=3D"ltr">following the same logic a filter on future should return someth=
ing that express empty container , defiantly not an exception, because it i=
s not an exception we do intend to filter those elements.</div><div dir=3D"=
ltr"><br></div><div dir=3D"ltr">=C2=A0</div></div><div class=3D"gmail_extra=
"><br><div class=3D"gmail_quote"><div dir=3D"ltr">2016-07-01 10:50 GMT+03:0=
0 Viktor Klang <span dir=3D"ltr"><<a href=3D"mailto:[email protected]=
om" target=3D"_blank">[email protected]</a>></span>:</div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex"><p dir=3D"ltr">Hi Avi,</p><p dir=3D"ltr">I see what y=
ou mean.</p><p dir=3D"ltr">I'd want to avoid discussing expectation sin=
ce it is subjective. I will however note that the actualnsemantics of the f=
ilter method on Future needs improvement: <a href=3D"http://www.scala-lang.=
org/api/2.11.8/index.html#scala.concurrent.Future@filter(p:T=3D" target=3D"=
_blank">http://www.scala-lang.org/api/2.11.8/index.html#scala.concurrent.Fu=
ture@filter(p:T=3D</a>>Boolean)(implicitexecutor:scala.concurrent.Execut=
ionContext):scala.concurrent.Future[T]</p><p dir=3D"ltr">As for might not r=
eturn the value, the same goes for all filter-methods:</p><p dir=3D"ltr">Li=
st returns List, but it might not have any elements at all. Option returns =
Option but can be Some or None, Future is either Success or Failure.</p><p =
dir=3D"ltr">If success has an optionality aspect in your usage, use Future =
of Option to express that, that would be my recommendation. </p><span><font=
color=3D"#888888"><p dir=3D"ltr">-- <br>
Cheers,<br>
=E2=88=9A</p></font></span><div><div>
<div class=3D"gmail_quote">On Jul 1, 2016 9:20 AM, "Avi Levi" <=
;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a>=
> wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir=
=3D"ltr">Thanks Victor,<br>
Of course it can be implemented as you suggested. But still I can argue th=
at the current implementation is not "really filtering" the resul=
ts as one might expect and less expressive if it might or not return the va=
lue than Option is more expressive, don't you agree? </p>
<div class=3D"gmail_quote">On Jul 1, 2016 10:06 AM, "Viktor Klang"=
; <<a href=3D"mailto:[email protected]" target=3D"_blank">viktor.kl=
[email protected]</a>> wrote:<br type=3D"attribution"><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex"><p dir=3D"ltr">Hi Avi,</p><p dir=3D"ltr">Use Fututre[Option[Int]] =
if you want to deal with Some/None as a result of filter ( f.map(_.filter(p=
) ) (alt. see monad transformers)</p><p dir=3D"ltr">-- <br>
Cheers,<br>
=E2=88=9A</p>
<div class=3D"gmail_quote">On Jul 1, 2016 8:53 AM, "Avi Levi" <=
;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a>=
> wrote:<br type=3D"attribution"><blockquote style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">I was trying =
to figure out what should I accept when filtering over a future .<div>the c=
urrent implementation yields either a T or an exception which kind of break=
s referential transparency (doesn't it ?) .</div><div>on the other hand=
what can I expect given this expression=C2=A0</div><div><p><span><i>def fo=
o(i:Int):Future[Int]</i></span></p><p><span>the type result of=C2=A0</span>=
</p><p><i>foo(1).filter(_ % 2 =3D=3D 0)</i></p><p><span><br></span></p></di=
v><div>I.M.H.O I would expect it to yield Option[T] =C2=A0which makes more =
sense to express that we might get a value that pass the filter or not . is=
that make sense ?</div><div><br></div><div>Cheers</div><font color=3D"#888=
888"><div>Avi=C2=A0</div></font></div><font color=3D"#888888"><div><br></di=
v>
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tl"><div><div dir=3D"rtl"><div dir=3D"ltr"><span style=3D"color:rgb(51,51,5=
1);font-family:proxima-nova-1,proxima-nova-2,Tahoma,Helvetica,Verdana,sans-=
serif;font-size:14px;line-height:21px">Sincerely,</span><br style=3D"color:=
rgb(51,51,51);font-family:proxima-nova-1,proxima-nova-2,Tahoma,Helvetica,Ve=
rdana,sans-serif;font-size:14px;line-height:21px"><span style=3D"color:rgb(=
51,51,51);font-family:proxima-nova-1,proxima-nova-2,Tahoma,Helvetica,Verdan=
a,sans-serif;font-size:14px;line-height:21px">Avi Levi</span></div><div dir=
=3D"ltr"><span style=3D"color:rgb(51,51,51);font-family:proxima-nova-1,prox=
ima-nova-2,Tahoma,Helvetica,Verdana,sans-serif;font-size:14px;line-height:2=
1px">m: <a href=3D"tel:%2B972-52-3459959" value=3D"+972523459959" target=3D=
"_blank">+972-52-3459959</a></span><span style=3D"color:rgb(51,51,51);font-=
family:proxima-nova-1,proxima-nova-2,Tahoma,Helvetica,Verdana,sans-serif;fo=
nt-size:14px;line-height:21px"><br></span></div><div dir=3D"ltr"><span styl=
e=3D"color:rgb(51,51,51);font-family:proxima-nova-1,proxima-nova-2,Tahoma,H=
elvetica,Verdana,sans-serif;font-size:14px;line-height:21px"><a href=3D"htt=
ps://www.linkedin.com/in/leviavi" target=3D"_blank"><img src=3D"https://doc=
s.google.com/uc?export=3Ddownload&id=3D0B82ayL0XJaZ5WEY0c2xWQWYxNDQ&=
;revid=3D0B82ayL0XJaZ5YklVWjUvcG9tQmNrVEFRSDhNd0lNLzUwKzlvPQ"><span></span>=
<span></span></a></span></div><div dir=3D"ltr"><span style=3D"margin:0px;pa=
dding:0px;border:0px;outline:0px;font-size:14px;font-family:proxima-nova-1,=
proxima-nova-2,Tahoma,Helvetica,Verdana,sans-serif;vertical-align:baseline;=
color:rgb(43,130,173);line-height:21px"><a href=3D"https://about.me/avi.lev=
i" target=3D"_blank">https://about.me/avi.levi</a></span><br></div></div></=
div></div></div></div></div>
</div><div><br></div>
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</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div data-s=
martmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><d=
iv dir=3D"ltr"><div><div dir=3D"ltr"><div>Oliver Ruebenacker<br></div><div>=
Senior Software Engineer, <a href=3D"http://www.type2diabetesgenetics.org/"=
target=3D"_blank">Diabetes Portal</a>, <a href=3D"http://www.broadinstitut=
e.org/" target=3D"_blank">Broad Institute</a><br></div><br></div></div></di=
v></div></div></div></div></div>
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</div></blockquote></div><br></div></div></div></div></div><div class=3D"HO=
EnZb"><div class=3D"h5">
<p></p>
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</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><d=
iv><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div>Oliver=
Ruebenacker<br></div><div>Senior Software Engineer, <a href=3D"http://www.=
type2diabetesgenetics.org/" target=3D"_blank">Diabetes Portal</a>, <a href=
=3D"http://www.broadinstitute.org/" target=3D"_blank">Broad Institute</a><b=
r></div><br></div></div></div></div></div></div></div></div>
</div>
<p></p>
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--001a1147da48aafd6a053692d1f9--