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package kamon
import org.scalatest.{WordSpecLike, Matchers}
import akka.actor.{ActorRef, Actor, Props, ActorSystem}
import akka.testkit.{ImplicitSender, TestKit}
import kamon.trace.Trace
import akka.pattern.{pipe, ask}
import akka.util.Timeout
import scala.concurrent.duration._
import scala.concurrent.{Await, Future}
import akka.routing.RoundRobinRouter
import kamon.trace.TraceContext
class ActorInstrumentationSpec extends TestKit(ActorSystem("ActorInstrumentationSpec")) with WordSpecLike with Matchers with ImplicitSender {
implicit val executionContext = system.dispatcher
"an instrumented actor ref" when {
"used inside the context of a transaction" should {
"propagate the trace context using bang" in new TraceContextEchoFixture {
echo ! "test"
expectMsg(Some(testTraceContext))
}
"propagate the trace context using tell" in new TraceContextEchoFixture {
echo.tell("test", testActor)
expectMsg(Some(testTraceContext))
}
"propagate the trace context using ask" in new TraceContextEchoFixture {
implicit val timeout = Timeout(1 seconds)
(echo ? "test") pipeTo(testActor)
expectMsg(Some(testTraceContext))
}
"propagate the trace context to actors behind a router" in new RoutedTraceContextEchoFixture {
val contexts: Seq[Option[TraceContext]] = for(_ <- 1 to 10) yield Some(tellWithNewContext(echo, "test"))
expectMsgAllOf(contexts: _*)
}
/*"propagate with many asks" in {
val echo = system.actorOf(Props[TraceContextEcho])
val iterations = 50000
implicit val timeout = Timeout(10 seconds)
val futures = for(_ <- 1 to iterations) yield {
Tracer.start
val result = (echo ? "test")
Tracer.clear
result
}
val allResults = Await.result(Future.sequence(futures), 10 seconds)
assert(iterations == allResults.collect {
case Some(_) => 1
}.sum)
}*/
}
}
trait TraceContextEchoFixture {
val testTraceContext = Trace.newTraceContext()
val echo = system.actorOf(Props[TraceContextEcho])
Trace.set(testTraceContext)
}
trait RoutedTraceContextEchoFixture extends TraceContextEchoFixture {
override val echo = system.actorOf(Props[TraceContextEcho].withRouter(RoundRobinRouter(nrOfInstances = 10)))
def tellWithNewContext(target: ActorRef, message: Any): TraceContext = {
val context = Trace.newTraceContext()
Trace.set(context)
target ! message
context
}
}
}
class TraceContextEcho extends Actor {
def receive = {
case msg: String ⇒ sender ! Trace.context()
}
}
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