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package akka.kamon.instrumentation
import akka.actor.{ Cell, Props, ActorRef, ActorSystem }
import akka.dispatch.{ Envelope, MessageDispatcher }
import akka.routing.RoutedActorCell
import kamon.Kamon
import kamon.akka.RouterMetrics
import kamon.metric.Entity
import kamon.util.RelativeNanoTimestamp
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation._
trait RouterMonitor {
def processMessage(pjp: ProceedingJoinPoint): AnyRef
def processFailure(failure: Throwable): Unit
def cleanup(): Unit
def routeeAdded(): Unit
def routeeRemoved(): Unit
}
object RouterMonitor {
def createRouterInstrumentation(cell: Cell): RouterMonitor = {
val cellInfo = CellInfo.cellInfoFor(cell, cell.system, cell.self, cell.parent)
def routerMetrics = Kamon.metrics.entity(RouterMetrics, cellInfo.entity)
if (cellInfo.isTracked)
new MetricsOnlyRouterMonitor(cellInfo.entity, routerMetrics)
else NoOpRouterMonitor
}
}
object NoOpRouterMonitor extends RouterMonitor {
def processMessage(pjp: ProceedingJoinPoint): AnyRef = pjp.proceed()
def processFailure(failure: Throwable): Unit = {}
def routeeAdded(): Unit = {}
def routeeRemoved(): Unit = {}
def cleanup(): Unit = {}
}
class MetricsOnlyRouterMonitor(entity: Entity, routerMetrics: RouterMetrics) extends RouterMonitor {
def processMessage(pjp: ProceedingJoinPoint): AnyRef = {
val timestampBeforeProcessing = RelativeNanoTimestamp.now
try {
pjp.proceed()
} finally {
val timestampAfterProcessing = RelativeNanoTimestamp.now
val routingTime = timestampAfterProcessing - timestampBeforeProcessing
routerMetrics.routingTime.record(routingTime.nanos)
}
}
def processFailure(failure: Throwable): Unit = {}
def routeeAdded(): Unit = {}
def routeeRemoved(): Unit = {}
def cleanup(): Unit = Kamon.metrics.removeEntity(entity)
}
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