[akka-user] Re: [akka-http] java completeWith mapping future

[Benoit Guillon]

Hi André,

Thanks for your reply, using Mapper works fine (a bit more verbose than the 
scala implementation)

For those who have the same issue: here is the solution:

private Future handleGetTask(RequestContext ctx){
return Patterns.ask(actorSystem.actorFor("myActor"), buildMessage(), 
1000)
.map(new Mapper<Object, RouteResult>(){
public RouteResult apply(Object o) {
return ctx.completeAs(Jackson.json(), o);
}
  }, ctx.executionContext());
}

Thanks

Benoit

Le mercredi 11 novembre 2015 16:08:15 UTC+1, André a écrit :
>
> Hi Benoit,
>
> you should take a look at 
> http://doc.akka.io/docs/akka/snapshot/java/futures.html#Future_is_a_Monad.
>
> Mapper should solve your Problem.
>
> Cheers
> André
>
> On Wednesday, November 11, 2015 at 12:01:05 PM UTC+1, Benoit Guillon wrote:
>>
>> Hi,
>>
>> I'm using akka http with Java DSL and I'm trying to handle a get request 
>> with an actor and map my actor's response to the HTTP response as follows:
>>
>> private Route getTasksRoute(){
>>return 
>> path("tasks").route(pathEndOrSingleSlash().route(get(this.handleWith(
>>   (ctx) -> ctx.completeWith(handleGetTask(ctx))
>>;
>> }
>>
>> private Future handleGetTask(RequestContext ctx){
>>return Patterns.ask(actorSystem.actorFor("myActor"), buildMessage(), 
>> 1000)
>>.map(o -> ctx.completeAs(Jackson.json(), o), 
>> ctx.executionContext());
>> }
>>
>> This code does not compile in Java 8 because the API enforces to use 
>> scala futures
>>
>> Error:(74, 17) java: method map in interface scala.concurrent.Future 
>> cannot be applied to given types;
>>   required: 
>> scala.Function1<java.lang.Object,S>,scala.concurrent.ExecutionContext
>>   found: (o)->ctx.c[...]), o),scala.concurrent.ExecutionContext
>>   reason: cannot infer type-variable(s) S
>> (argument mismatch; scala.Function1 is not a functional interface
>>   multiple non-overriding abstract methods found in interface 
>> scala.Function1)
>>
>> I could not find any relevant code example illustrating this use case in 
>> java.
>>
>> Can you suggest a code pattern to illustrate how the completeWith method 
>> is intended to be used in Java 8 in conjonction with actors' ask pattern ?
>>
>> Thanks for your help.
>>
>> Benoit
>>
>>

-- 
>>>>>>>>>>  Read the docs: http://akka.io/docs/
>>>>>>>>>>  Check the FAQ: 
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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[akka-user] [akka-http] java completeWith mapping future

[Benoit Guillon]

Hi,

I'm using akka http with Java DSL and I'm trying to handle a get request 
with an actor and map my actor's response to the HTTP response as follows:

private Route getTasksRoute(){
   return 
path("tasks").route(pathEndOrSingleSlash().route(get(this.handleWith(
  (ctx) -> ctx.completeWith(handleGetTask(ctx))
   ;
}

private Future handleGetTask(RequestContext ctx){
   return Patterns.ask(actorSystem.actorFor("myActor"), buildMessage(), 
1000)
   .map(o -> ctx.completeAs(Jackson.json(), o), ctx.executionContext());
}

This code does not compile in Java 8 because the API enforces to use scala 
futures

Error:(74, 17) java: method map in interface scala.concurrent.Future 
cannot be applied to given types;
  required: 
scala.Function1,scala.concurrent.ExecutionContext
  found: (o)->ctx.c[...]), o),scala.concurrent.ExecutionContext
  reason: cannot infer type-variable(s) S
(argument mismatch; scala.Function1 is not a functional interface
  multiple non-overriding abstract methods found in interface 
scala.Function1)

I could not find any relevant code example illustrating this use case in 
java.

Can you suggest a code pattern to illustrate how the completeWith method is 
intended to be used in Java 8 in conjonction with actors' ask pattern ?

Thanks for your help.

Benoit

-- 
>>  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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