Re: Filter on future doesn't make sense

Viktor Klang <[email protected]> Fri, 1 Jul 2016 15:02:12 +0200
Newsgroups gmane.comp.lang.scala
Message-ID <CANPzfU_SdUT_aJYje+u3Dc8DrskxE7A9k1AwmVTY5OJ6fz_vOA@mail.gmail.com>
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Hi Oliver,

Which is why I explicitly talked about the success path.
As you saw, onComplete takes both path, much similar to something like
toString.

See my previous example for details.

--=20
Cheers,
=E2=88=9A
On Jul 1, 2016 2:54 PM, "Oliver Ruebenacker" <[email protected]> wrote:


     Hello,

  Looks like sometimes you do get an exception:



























*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 th=
e
>> filter. Wouldn't it be better if we can get something that express an em=
pty
>> 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 (empty=
 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 F=
uture
>>>>> needs improvement:
>>>>> http://www.scala-lang.org/api/2.11.8/index.html#scala.concurrent.Futu=
re@filter(p:T=3D
>>>>> >Boolean)(implicitexecutor:scala.concurrent.ExecutionContext):scala.c=
oncurrent.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 F=
ailure.
>>>>>
>>>>> 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 th=
e 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 transformers=
)
>>>>>>>
>>>>>>> --
>>>>>>> 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 over
>>>>>>> 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 sens=
e
>>>>>>> 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.
>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>> send an email to [email protected].
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>>>>>>>
>>>>>>> --
>>>>>>> You received this message because you are subscribed to a topic in
>>>>>>> the Google Groups "scala-language" group.
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>>>>>>> https://groups.google.com/d/topic/scala-language/wpGOB8f7qmY/unsubs=
cribe
>>>>>>> .
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>>>>>>> [email protected].
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>>>>>>>
>>>>>> --
>>>>>> You received this message because you are subscribed to the Google
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>>>>> --
>>>>> You received this message because you are subscribed to a topic in th=
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>>>>> Google Groups "scala-language" group.
>>>>> To unsubscribe from this topic, visit
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Sincerely,
>>>> Avi Levi
>>>> m: +972-52-3459959
>>>> <https://www.linkedin.com/in/leviavi>
>>>> https://about.me/avi.levi
>>>>
>>>> --
>>>> You received this message because you are subscribed to the Google
>>>> Groups "scala-language" group.
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>>>>
>>> --
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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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<p dir=3D"ltr">Hi Oliver,</p>
<p dir=3D"ltr">Which is why I explicitly talked about the success path.<br>
As you saw, onComplete takes both path, much similar to something like toSt=
ring.</p>
<p dir=3D"ltr">See my previous example for details.</p>
<p dir=3D"ltr">-- <br>
Cheers,<br>
=E2=88=9A</p>
<div class=3D"gmail_quote">On Jul 1, 2016 2:54 PM, &quot;Oliver Ruebenacker=
&quot; &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt; wro=
te:<br type=3D"attribution"><blockquote class=3D"quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>=
<div><br></div>=C2=A0=C2=A0=C2=A0=C2=A0 Hello,<br><br></div>=C2=A0 Looks li=
ke sometimes you do get an exception:<br><div><div><br><b><span style=3D"fo=
nt-family:monospace,monospace">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 t=
ry :help.<br><br>scala&gt; import scala.concurrent.Future<br>import scala.c=
oncurrent.Future<br><br>scala&gt; import scala.concurrent.ExecutionContext.=
Implicits.global<br>import scala.concurrent.ExecutionContext.Implicits.glob=
al<br><br>scala&gt; Future{1}.onComplete { case _ =3D&gt; println(&quot;Com=
plete!&quot;) }<br><br>scala&gt; Complete!<br><br><br>scala&gt; Future{1}.f=
ilter(_ =3D=3D 0).onComplete { case _ =3D&gt; println(&quot;Complete!&quot;=
) }<br>Complete!<br><br>scala&gt; import scala.util.{Success, Failure }<br>=
import scala.util.{Success, Failure}<br><br>scala&gt; Future{1}.filter(_ =
=3D=3D 0).onComplete {<br>=C2=A0=C2=A0=C2=A0=C2=A0 | case Success(value) =
=3D&gt; println(value)<br>=C2=A0=C2=A0=C2=A0=C2=A0 | case Failure(ex) =3D&g=
t; println(ex)<br>=C2=A0=C2=A0=C2=A0=C2=A0 | }<br><br>java.util.NoSuchEleme=
ntException: Future.filter predicate is not satisfied<br>scala&gt;</span></=
b><br><br></div><div>=C2=A0=C2=A0=C2=A0=C2=A0 Best, Oliver<br></div><div><b=
r></div></div></div><div class=3D"gmail_extra"><div class=3D"elided-text"><=
br><div class=3D"gmail_quote">On Fri, Jul 1, 2016 at 5:44 AM, Viktor Klang =
<span dir=3D"ltr">&lt;<a href=3D"mailto:[email protected]" target=3D"_=
blank">[email protected]</a>&gt;</span> wrote:<br><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex"><p dir=3D"ltr">I think you are conflating the notion of optional=
ity 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 colo=
r=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, &quot;Avi Levi&quot; &l=
t;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a=
>&gt; 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&#39;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, &quot;Viktor Klang&quot=
; &lt;<a href=3D"mailto:[email protected]" target=3D"_blank">viktor.kl=
[email protected]</a>&gt; 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&#39;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, &quot;Avi Levi&quot; &l=
t;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a=
>&gt; 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&#39;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">&lt;<a href=3D"mailto:[email protected]=
om" target=3D"_blank">[email protected]</a>&gt;</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 you mean.</p>
<p dir=3D"ltr">I&#39;d want to avoid discussing expectation since it is sub=
jective. I will however note that the actualnsemantics of the filter 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.Future@filter(=
p:T=3D</a>&gt;Boolean)(implicitexecutor:scala.concurrent.ExecutionContext):=
scala.concurrent.Future[T]</p>
<p dir=3D"ltr">As for might not return the value, the same goes for all fil=
ter-methods:</p>
<p dir=3D"ltr">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 o=
r Failure.</p>
<p dir=3D"ltr">If success has an optionality aspect in your usage, use Futu=
re of Option to express that, that would be my recommendation. </p><span><f=
ont 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, &quot;Avi Levi&quot; &lt=
;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a>=
&gt; 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 &quot;really filtering&quot; 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&#39;t you agree? </p>
<div class=3D"gmail_quote">On Jul 1, 2016 10:06 AM, &quot;Viktor Klang&quot=
; &lt;<a href=3D"mailto:[email protected]" target=3D"_blank">viktor.kl=
[email protected]</a>&gt; 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, &quot;Avi Levi&quot; &lt=
;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a>=
&gt; 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&#39;t it ?) .</div><div>on the other hand=
 what can I expect given this expression=C2=A0</div><div>







<p><span><i>def foo(i:Int):Future[Int]</i></span></p><p><span>the type resu=
lt of=C2=A0</span></p><p><i>foo(1).filter(_ % 2 =3D=3D 0)</i></p>







<p><span><br></span></p></div><div>I.M.H.O I would expect it to yield Optio=
n[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>Che=
ers</div><font color=3D"#888888"><div>Avi=C2=A0</div></font></div><font col=
or=3D"#888888">

<p></p>

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<div data-smartmail=3D"gmail_signature"><div dir=3D"rtl"><div><div dir=3D"r=
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:=
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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=
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