Created
April 3, 2013 08:35
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Play2 Scala sampled message stream as EventSource
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| val (broadcast, channel) = play.api.libs.iteratee.Concurrent.broadcast[JsValue] | |
| def folder(d:Duration):Iteratee[JsValue,(Option[Long], List[JsValue])] = Iteratee.fold2[JsValue,(Option[Long], List[JsValue])]((None:Option[Long], List[JsValue]())){ | |
| case ((t,els),e) => { | |
| val now = new Date().getTime | |
| val current = t.getOrElse(now) | |
| val done = now - current >= d.toMillis | |
| Future.successful(((Some(current), e :: els),done)) | |
| } | |
| } | |
| def average(d:Duration):Enumeratee[JsValue,JsValue] = Enumeratee.grouped(folder(d).map{ case (_,l) => | |
| val averageLatency = l.map(x => (x \ "latency").as[Float]).sum / l.size | |
| def transformer = __.json.update((__ \ "latency").json.put(JsNumber(averageLatency))) | |
| l.headOption | |
| .flatMap( _.validate(transformer).asOpt) | |
| .map(_ ++ Json.obj("time"-> new Date().getTime)) | |
| .getOrElse(JsNull) | |
| }) | |
| def forUser(id:String) = Enumeratee.filter[JsValue](j => (j \ "uuid").as[String] == id) | |
| def stream(id:String) = Action{ | |
| Ok.feed(broadcast &> forUser(id) &> average(1 second) &> play.api.libs.EventSource()) | |
| .as("text/event-stream") | |
| } |
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