Broadcasting messages in Play Framework WebSockets

Question

I\'m pushing messages in Play Framework WebSockets using Concurrent.unicast[JsValue], and I want to optimize sending the same message to multiple users. Is it p

Answer 1

From my experiments, Concurrent.broadcast does not send to everyone (some unfortunate naming perhaps?) Here is what I used that works as expected.

package controllers

import play.api._
import play.api.mvc._
import play.api.libs.iteratee.Concurrent
import play.api.libs.iteratee.Iteratee
import play.api.libs.concurrent.Execution.Implicits.defaultContext
import scala.collection.mutable.{Set => MS}
import scala.concurrent._ 

object Application extends Controller {
  val c:MS[(Int, Concurrent.Channel[String])] = MS() // (channelID, Channel))

  def pushHello = c.foreach(_._2.push("hello")) // push to ALL channels

  def index = WebSocket.async[String] { _ => future{
        val (out,channel) = Concurrent.broadcast[String]          
        val channelID = scala.util.Random.nextInt
        c.add((channelID, channel))
        val in = Iteratee.foreach[String] {
          _ match {
            case any => channel.push("received:"+any) // push to current channel
          }
        }.map { _ => c.retain(x => x._1 != channelID) }
        (in, out)
    }
  }
}