Thanks, Derek
On Sun, Apr 10, 2016 at 2:02 PM, Derek Wyatt <de...@derekwyatt.org> wrote:
> Alright. I'll play around with these over the next few days and send you a
> PR.
>
> On Fri, Apr 8, 2016 at 12:12 PM Patrik Nordwall <patrik.nordw...@gmail.com>
> wrote:
>
>> Hi Derek,
>> Sounds like a great addition. Will you take a stab at it?
>> /Patrik
>>
>> On Thu, Apr 7, 2016 at 9:59 PM, Derek Wyatt <de...@derekwyatt.org> wrote:
>>
>>> Hi guys,
>>>
>>> I've been writing some tests for my stream code and have run up against
>>> a situation where I would like to have expectNextType. I've
>>> implemented this myself with a pimp, but I'm wondering if there's a better
>>> way?
>>>
>>> implicit class ProbeExtension[T](val p: Probe[T]) {
>>> def expectNextType[A](implicit t: ClassTag[A]): p.Self = {
>>> p.expectNextPF {
>>> case a: A =>
>>> case x => fail(s"Expected a $t type but got a
>>> ${x.getClass.getName}")
>>> }
>>> p
>>> }
>>> }
>>>
>>> This is mostly useful when the 'A' in question is a derivation of Try[_].
>>> I tend to write expectNextType[Failure[_]] in these cases. And, just
>>> to give some context as to why I would want to do that: My flow components
>>> might return a Try, which I then pass through a special handling / logging
>>> flow, which transforms them to a List that is composed with a mapConcat.
>>> So...
>>>
>>> val flowReturningTry: Flow[T, Try[U], NotUsed] = ...
>>> val handlingAndLogging: Flow[Try[U], U, NotUsed] =
>>> Flow[Try[U]].mapConcat { /* List(u) or List(), depending on the Try */ }
>>> val composed: Flow[T, U, NotUsed] =
>>> flowReturningTry.mapConcat(handlingAndLogging)
>>>
>>> Now, when testing flowReturningTry in isolation, the expectNextType is
>>> useful.
>>>
>>> Cheers and thanks,
>>> Derek
>>>
>> --
>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
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>>
>>
>>
>> --
>>
>> Patrik Nordwall
>> Akka Tech Lead
>> Lightbend <http://www.lightbend.com/> - Reactive apps on the JVM
>> Twitter: @patriknw
>>
>> --
>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>> >>>>>>>>>> Check the FAQ:
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> --
> >>>>>>>>>> Read the docs: http://akka.io/docs/
> >>>>>>>>>> Check the FAQ:
> http://doc.akka.io/docs/akka/current/additional/faq.html
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--
Patrik Nordwall
Akka Tech Lead
Lightbend <http://www.lightbend.com/> - Reactive apps on the JVM
Twitter: @patriknw
--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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