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Meeraj Kunnumpurath  
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 More options Apr 25 2012, 3:08 pm
From: Meeraj Kunnumpurath <meeraj.kunnumpur...@asyska.com>
Date: Wed, 25 Apr 2012 20:08:33 +0100
Local: Wed, Apr 25 2012 3:08 pm
Subject: [2.0 - Scala] Multiple async calls
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Hi,

What is the best way to use async HTTP in a controller that makes multiple
outbound WS calls such that the response is returned after all the calls
complete?

Kind regards
Meeraj


 
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Discussion subject changed to "[2.0 - Scala] Multiple async calls" by Pascal Voitot Dev
Pascal Voitot Dev  
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 More options Apr 25 2012, 4:06 pm
From: Pascal Voitot Dev <pascal.voitot....@gmail.com>
Date: Wed, 25 Apr 2012 22:06:17 +0200
Local: Wed, Apr 25 2012 4:06 pm
Subject: Re: [play-framework] [2.0 - Scala] Multiple async calls
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You can use a wonderful feature from Promise:
Promise.sequence(List[Promise[A]]): Promise[List[A]]

You can provide it with a List (or any sequence) of promises and it returns
a Promise of List meaning it redeems all Promises before redeemining the
Promise[List].
So you can launch several WS calls in parallel and it will await for
responses in an asynchronous and non-blocking way...

A Promise can embed other promises etc... So you can build a tree of
promises etc...

interesting isn't it?

br
Pascal

On Wed, Apr 25, 2012 at 9:08 PM, Meeraj Kunnumpurath <


 
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Nourhan El Malahy  
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 More options Apr 25 2012, 4:08 pm
From: Nourhan El Malahy <nourhan.mal...@gmail.com>
Date: Wed, 25 Apr 2012 22:08:52 +0200
Local: Wed, Apr 25 2012 4:08 pm
Subject: Re: [play-framework] [2.0 - Scala] Multiple async calls
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Guys, please how can I pop-up a message when the user clicks on a certain
button??

On Wed, Apr 25, 2012 at 10:06 PM, Pascal Voitot Dev <


 
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Pascal Voitot Dev  
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 More options Apr 25 2012, 4:37 pm
From: Pascal Voitot Dev <pascal.voitot....@gmail.com>
Date: Wed, 25 Apr 2012 22:37:44 +0200
Local: Wed, Apr 25 2012 4:37 pm
Subject: Re: [play-framework] [2.0 - Scala] Multiple async calls
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please don't pollute another thread...
open a new thread if you have a specific question

thanks
Pascal

On Wed, Apr 25, 2012 at 10:08 PM, Nourhan El Malahy <


 
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Nourhan El Malahy  
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 More options Apr 25 2012, 4:46 pm
From: Nourhan El Malahy <nourhan.mal...@gmail.com>
Date: Wed, 25 Apr 2012 22:46:11 +0200
Local: Wed, Apr 25 2012 4:46 pm
Subject: Re: [play-framework] [2.0 - Scala] Multiple async calls
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I'm Sorry, I didn't notice! I wrote it here by mistake!

On Wed, Apr 25, 2012 at 10:37 PM, Pascal Voitot Dev <


 
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Meeraj Kunnumpurath  
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 More options Apr 25 2012, 5:41 pm
From: Meeraj Kunnumpurath <meeraj.kunnumpur...@asyska.com>
Date: Wed, 25 Apr 2012 22:41:38 +0100
Local: Wed, Apr 25 2012 5:41 pm
Subject: Re: [play-framework] [2.0 - Scala] Multiple async calls
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Thanks Pascal, I will have a look at that. Yes, I did see a passing
reference to this in the Play docco.

Regards
Meeraj

On Wed, Apr 25, 2012 at 9:06 PM, Pascal Voitot Dev <


 
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Meeraj Kunnumpurath  
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 More options Apr 26 2012, 5:42 pm
From: Meeraj Kunnumpurath <meeraj.kunnumpur...@asyska.com>
Date: Thu, 26 Apr 2012 22:42:11 +0100
Local: Thurs, Apr 26 2012 5:42 pm
Subject: Re: [play-framework] [2.0 - Scala] Multiple async calls
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Hi Pascal,

Thanks for your suggestion, it works like a dream. I have the code below,
if it is of any help to anyone else.

def makeCall() = Action { implicit request =>

    def scheduleCalls(callIds : Seq[String], request : Request[AnyRef]) :
List[Promise[Response]] = {
        if (callIds.isEmpty) {
            return List()
        } else {
            val promise = WS.url("https://callUrl" + callIds.head).post("")
            promise :: scheduleCalls(callIds.tail, request)
        }
    }

    Async {
        val callIds = request.body.asFormUrlEncoded.get("callId")
        val promises = Promise.sequence(scheduleCalls(callIds, request))
        promises.map { response =>
            Ok("Ok")
        }
    }

}

Regards
Meeraj

On Wed, Apr 25, 2012 at 9:06 PM, Pascal Voitot Dev <


 
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Pascal Voitot Dev  
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 More options Apr 26 2012, 5:51 pm
From: Pascal Voitot Dev <pascal.voitot....@gmail.com>
Date: Thu, 26 Apr 2012 23:51:18 +0200
Local: Thurs, Apr 26 2012 5:51 pm
Subject: Re: [play-framework] [2.0 - Scala] Multiple async calls
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One of the great features of Play2 ;)

You're welcome ;)

On Thu, Apr 26, 2012 at 11:42 PM, Meeraj Kunnumpurath <


 
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