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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 scala.concurrent.{ExecutionContext, Await, Promise, Future}
import org.scalatest.{Matchers, OptionValues, WordSpec}
import org.scalatest.concurrent.{ScalaFutures, PatienceConfiguration}
import java.util.UUID
import scala.util.{Random, Success}
import scala.concurrent.duration._
import java.util.concurrent.TimeUnit
import akka.actor.{Actor, ActorSystem}
import kamon.trace.{Trace, TraceContext}
class FutureTracingSpec extends WordSpec with Matchers with ScalaFutures with PatienceConfiguration with OptionValues {
implicit val execContext = ExecutionContext.Implicits.global
"a Future created with FutureTracing" should {
"capture the TraceContext available when created" which {
"must be available when executing the future's body" in new TraceContextFixture {
var future: Future[Option[TraceContext]] = _
Trace.withContext(testTraceContext) {
future = Future(Trace.context)
}
whenReady(future)( ctxInFuture =>
ctxInFuture should equal(testTraceContext)
)
}
"must be available when executing callbacks on the future" in new TraceContextFixture {
var future: Future[Option[TraceContext]] = _
Trace.withContext(testTraceContext) {
future = Future("Hello Kamon!")
// The TraceContext is expected to be available during all intermediate processing.
.map (_.length)
.flatMap(len => Future(len.toString))
.map (s => Trace.context())
}
whenReady(future)( ctxInFuture =>
ctxInFuture should equal(testTraceContext)
)
}
}
}
trait TraceContextFixture {
val random = new Random(System.nanoTime)
val testTraceContext = Some(TraceContext(Actor.noSender, random.nextInt))
}
}
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