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/* ===================================================
* Copyright © 2013 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ========================================================== */
package kamon.trace.instrumentation
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 ActorMessagePassingTracingSpec extends TestKit(ActorSystem("actor-message-passing-tracing-spec")) with WordSpecLike with ImplicitSender {
implicit val executionContext = system.dispatcher
"the message passing instrumentation" should {
"propagate the TraceContext using bang" in new TraceContextEchoFixture {
Trace.withContext(testTraceContext) {
ctxEchoActor ! "test"
}
expectMsg(testTraceContext)
}
"propagate the TraceContext using tell" in new TraceContextEchoFixture {
Trace.withContext(testTraceContext) {
ctxEchoActor.tell("test", testActor)
}
expectMsg(testTraceContext)
}
"propagate the TraceContext using ask" in new TraceContextEchoFixture {
implicit val timeout = Timeout(1 seconds)
Trace.withContext(testTraceContext) {
// The pipe pattern use Futures internally, so FutureTracing test should cover the underpinnings of it.
(ctxEchoActor ? "test") pipeTo(testActor)
}
expectMsg(testTraceContext)
}
"propagate the TraceContext to actors behind a router" in new RoutedTraceContextEchoFixture {
Trace.withContext(testTraceContext) {
ctxEchoActor ! "test"
}
expectMsg(testTraceContext)
}
}
trait TraceContextEchoFixture {
val testTraceContext = Some(Trace.newTraceContext(""))
val ctxEchoActor = system.actorOf(Props[TraceContextEcho])
}
trait RoutedTraceContextEchoFixture extends TraceContextEchoFixture {
override val ctxEchoActor = system.actorOf(Props[TraceContextEcho].withRouter(RoundRobinRouter(nrOfInstances = 1)))
}
}
class TraceContextEcho extends Actor {
def receive = {
case msg: String ⇒ sender ! Trace.context()
}
}
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