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/*
* =========================================================================================
* Copyright © 2013-2015 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.metric
import akka.actor._
import akka.testkit.{TestProbe, ImplicitSender}
import com.typesafe.config.ConfigFactory
import kamon.Kamon
import kamon.metric.SubscriptionsDispatcher.TickMetricSnapshot
import kamon.testkit.BaseKamonSpec
import scala.concurrent.duration._
class SubscriptionsProtocolSpec extends BaseKamonSpec("subscriptions-protocol-spec") with ImplicitSender {
override lazy val config =
ConfigFactory.parseString(
"""
|kamon.metric {
| tick-interval = 1 hour
|}
""".stripMargin
)
lazy val metricsModule = Kamon.metrics
import metricsModule.{entity, subscribe, unsubscribe}
"the Subscriptions messaging protocol" should {
"allow subscribing for a single tick" in {
val subscriber = TestProbe()
entity(TraceMetrics, "one-shot")
subscribe("trace", "one-shot", subscriber.ref, permanently = false)
flushSubscriptions()
val tickSnapshot = subscriber.expectMsgType[TickMetricSnapshot]
tickSnapshot.metrics.size should be(1)
tickSnapshot.metrics.keys should contain(Entity("one-shot", "trace"))
flushSubscriptions()
subscriber.expectNoMsg(1 second)
}
"allow subscribing permanently to a metric" in {
val subscriber = TestProbe()
entity(TraceMetrics, "permanent")
subscribe("trace", "permanent", subscriber.ref, permanently = true)
for (repetition ← 1 to 5) {
flushSubscriptions()
val tickSnapshot = subscriber.expectMsgType[TickMetricSnapshot]
tickSnapshot.metrics.size should be(1)
tickSnapshot.metrics.keys should contain(Entity("permanent", "trace"))
}
}
"allow subscribing to metrics matching a glob pattern" in {
val subscriber = TestProbe()
entity(TraceMetrics, "include-one")
entity(TraceMetrics, "exclude-two")
entity(TraceMetrics, "include-three")
subscribe("trace", "include-*", subscriber.ref, permanently = true)
for (repetition ← 1 to 5) {
flushSubscriptions()
val tickSnapshot = subscriber.expectMsgType[TickMetricSnapshot]
tickSnapshot.metrics.size should be(2)
tickSnapshot.metrics.keys should contain(Entity("include-one", "trace"))
tickSnapshot.metrics.keys should contain(Entity("include-three", "trace"))
}
}
"send a single TickMetricSnapshot to each subscriber, even if subscribed multiple times" in {
val subscriber = TestProbe()
entity(TraceMetrics, "include-one")
entity(TraceMetrics, "exclude-two")
entity(TraceMetrics, "include-three")
subscribe("trace", "include-one", subscriber.ref, permanently = true)
subscribe("trace", "include-three", subscriber.ref, permanently = true)
for (repetition ← 1 to 5) {
flushSubscriptions()
val tickSnapshot = subscriber.expectMsgType[TickMetricSnapshot]
tickSnapshot.metrics.size should be(2)
tickSnapshot.metrics.keys should contain(Entity("include-one", "trace"))
tickSnapshot.metrics.keys should contain(Entity("include-three", "trace"))
}
}
"allow un-subscribing a subscriber" in {
val subscriber = TestProbe()
entity(TraceMetrics, "one-shot")
subscribe("trace", "one-shot", subscriber.ref, permanently = true)
flushSubscriptions()
val tickSnapshot = subscriber.expectMsgType[TickMetricSnapshot]
tickSnapshot.metrics.size should be(1)
tickSnapshot.metrics.keys should contain(Entity("one-shot", "trace"))
unsubscribe(subscriber.ref)
flushSubscriptions()
subscriber.expectNoMsg(1 second)
}
}
def subscriptionsActor: ActorRef = {
val listener = TestProbe()
system.actorSelection("/user/kamon/kamon-metrics").tell(Identify(1), listener.ref)
listener.expectMsgType[ActorIdentity].ref.get
}
}
class ForwarderSubscriber(target: ActorRef) extends Actor {
def receive = {
case anything ⇒ target.forward(anything)
}
}
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