Akka/Scala example source code file (HeartbeatNodeRingSpec.scala)

This example Akka source code file (HeartbeatNodeRingSpec.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

a, akka, cluster, collection, concurrent, hashednodering, heartbeatnodering, heartbeatnoderingspec, matchers, routing, set, time, uniqueaddress, wordspec

The HeartbeatNodeRingSpec.scala Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */

package akka.cluster

import org.scalatest.WordSpec
import org.scalatest.Matchers
import akka.actor.Address
import akka.routing.ConsistentHash
import scala.concurrent.duration._
import scala.collection.immutable

@org.junit.runner.RunWith(classOf[org.scalatest.junit.JUnitRunner])
class HeartbeatNodeRingSpec extends WordSpec with Matchers {

  val aa = UniqueAddress(Address("akka.tcp", "sys", "aa", 2552), 1)
  val bb = UniqueAddress(Address("akka.tcp", "sys", "bb", 2552), 2)
  val cc = UniqueAddress(Address("akka.tcp", "sys", "cc", 2552), 3)
  val dd = UniqueAddress(Address("akka.tcp", "sys", "dd", 2552), 4)
  val ee = UniqueAddress(Address("akka.tcp", "sys", "ee", 2552), 5)

  val nodes = Set(aa, bb, cc, dd, ee)

  "A HashedNodeRing" must {

    "pick specified number of nodes as receivers" in {
      val ring = HeartbeatNodeRing(cc, nodes, 3)
      ring.myReceivers should be(ring.receivers(cc))

      nodes foreach { n ⇒
        val receivers = ring.receivers(n)
        receivers.size should be(3)
        receivers should not contain (n)
      }
    }

    "pick all except own as receivers when less than total number of nodes" in {
      val expected = Set(aa, bb, dd, ee)
      HeartbeatNodeRing(cc, nodes, 4).myReceivers should be(expected)
      HeartbeatNodeRing(cc, nodes, 5).myReceivers should be(expected)
      HeartbeatNodeRing(cc, nodes, 6).myReceivers should be(expected)
    }

    "pick none when alone" in {
      val ring = HeartbeatNodeRing(cc, Set(cc), 3)
      ring.myReceivers should be(Set())
    }

  }
}