Cannot broadcast to all clients in play2 - scala

Question

Now I'm working on WebSocket using Play2(Scala) and succeessfully communicate with client. However, the broadcast function that play offers seems not to send message to all clients. How can I fix it?
:Controller in server
def ws = WebSocket.using[String] { request =>
val (out, channel) = Concurrent.broadcast[String]
val in = Iteratee.foreach[String] { msg =>
println(msg)
channel push(msg)
}.map{ _ => println("closed") } //when connection close
(in, out)
}
:Client Side
$ ->
ws = new WebSocket("ws://localhost:9000/ws")
ws.onopen = (event) ->
console.log("connected!!")
ws.onmessage = (event) ->
data = event.data.split(",")
infotype = data[0]
if infotype is "noisy"
room = data[1]
alert "noise happen at " + room
else if infotype is "gotIt"
console.log("someone gotIt")
else
console.log(data)
alert("oh arrive")
ws.onerror = (event) ->
console.log("error happned")
$(".rooms").on("click", (event) ->
room = $(this).attr("id")
ws.send("noisy," + room) )
Ideally, when push the button(not button but just rooms class in this case), the client send message to the server(this works correctly) and server should broadcast that message to all clients(it did not work in my code).
As a result, all clients should show the alert message.
However, Only the client which sent message to the server can get the message from server and show the alert.
What is the problem?

Answer 1

It's because you create a new Concurrent.broadcast for every client.
Create it once outside your action, like this:
val (out, channel) = Concurrent.broadcast[String]
def ws = WebSocket.using[String] { request =>
val in = Iteratee.foreach[String] { msg =>
println(msg)
channel push(msg)
}.map{ _ => println("closed") } //when connection close
(in, out)
}