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

This example Akka source code file (PluginSpec.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

actor, actorref, akka, atomicinteger, beforeandafterall, classtag, matchers, persistence, pluginspec, reflection, string, test, testing, testkit, testkitbase, unit

The PluginSpec.scala Akka example source code

package akka.persistence

import java.util.concurrent.atomic.AtomicInteger

import scala.reflect.ClassTag

import akka.actor._
import akka.testkit._

import com.typesafe.config._

import org.scalatest._

trait PluginSpec extends TestKitBase with WordSpecLike with Matchers with BeforeAndAfterAll with BeforeAndAfterEach {
  private val counter = new AtomicInteger(0)

  private var _extension: Persistence = _
  private var _pid: String = _

  // used to avoid messages be delivered to a restarted actor,
  // this is akka-persistence internals and journals themselfes don't really care
  protected val actorInstanceId = 1

  override protected def beforeEach(): Unit = {
    _pid = s"p-${counter.incrementAndGet()}"
  }
  override protected def beforeAll(): Unit =
    _extension = Persistence(system)

  override protected def afterAll(): Unit =
    shutdown(system)

  val config: Config

  def extension: Persistence =
    _extension

  def pid: String =
    _pid

  def subscribe[T: ClassTag](subscriber: ActorRef) =
    system.eventStream.subscribe(subscriber, implicitly[ClassTag[T]].runtimeClass)
}