jehrhardt / play-ws-loadbalancer   0.1.0

MIT License GitHub

Client side load balancer for Play 2 WS module based on Netflix' Ribbon

Scala versions: 2.10


Client side load balancer for Play 2 WS module based on Netflix' Ribbon.

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This module requires the Play framework version 2.4.x and works with Scala 2.11 and 2.10.


Add the WS and the load balancer module to your project's dependencies in build.sbt.

libraryDependencies ++= Seq(
  "io.derjan" %% "play-ws-loadbalancer" % "0.1.0"

Create a load balancer object with a Ribbon load balancer, that fits your needs.

import scala.collection.JavaConverters._

val servers = Seq(new Server("localhost", 8080), new Server("localhost", 8081))
val builder = LoadBalancerBuilder.newBuilder[Server]()
val loadBalancer = new WSLoadBalancer(builder.buildFixedServerListLoadBalancer(servers.asJava))

The above example will use a Ribbon load balancer with a fixed list of servers. You can than inject the load balancer into your controller and wrap WS calls with it to get an endpoint from the server list.

class Application(ws: WSClient, loadBalancer: WSLoadBalancer) extends Controller {
  def index = Action.async {
    val response = loadBalancer withEndpoint { endpoint =>

    response map { result =>