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package kamon.metric
import java.util.concurrent.{ConcurrentHashMap, ConcurrentSkipListSet, TimeUnit}
import akka.actor.ActorRef
import com.codahale.metrics
import com.codahale.metrics.{MetricFilter, Metric, ConsoleReporter, MetricRegistry}
object Metrics {
val registry: MetricRegistry = new MetricRegistry
val consoleReporter = ConsoleReporter.forRegistry(registry).convertDurationsTo(TimeUnit.NANOSECONDS)
//consoleReporter.build().start(45, TimeUnit.SECONDS)
//val newrelicReporter = NewRelicReporter(registry)
//newrelicReporter.start(5, TimeUnit.SECONDS)
def include(name: String, metric: Metric) = registry.register(name, metric)
def exclude(name: String) = {
registry.removeMatching(new MetricFilter {
def matches(name: String, metric: Metric): Boolean = name.startsWith(name)
})
}
def deregister(fullName: String) = {
registry.removeMatching(new MetricFilter {
def matches(name: String, metric: Metric): Boolean = name.startsWith(fullName)
})
}
}
object Watched {
case object Actor
case object Dispatcher
}
object MetricDirectory {
def nameForDispatcher(actorSystem: String, dispatcher: String) = s"/ActorSystem/${actorSystem}/Dispatcher/${dispatcher}/"
def nameForMailbox(actorSystem: String, actor: String) = s"/ActorSystem/$actorSystem/Actor/$actor/Mailbox"
def nameForActor(actorRef: ActorRef) = actorRef.path.elements.mkString("/")
def shouldInstrument(actorSystem: String): Boolean = !actorSystem.startsWith("kamon")
def shouldInstrumentActor(actorPath: String): Boolean = {
!(actorPath.isEmpty || actorPath.startsWith("system"))
}
}
case class DispatcherMetricCollector(activeThreadCount: Histogram, poolSize: Histogram, queueSize: Histogram)
trait Histogram {
def update(value: Long): Unit
def snapshot: HistogramSnapshot
}
trait HistogramSnapshot {
def median: Double
def max: Double
def min: Double
}
case class ActorSystemMetrics(actorSystemName: String) {
import scala.collection.JavaConverters._
val dispatchers = new ConcurrentHashMap[String, DispatcherMetricCollector] asScala
private[this] def createDispatcherCollector: DispatcherMetricCollector = DispatcherMetricCollector(CodahaleHistogram(), CodahaleHistogram(), CodahaleHistogram())
def registerDispatcher(dispatcherName: String): Option[DispatcherMetricCollector] = {
val stats = createDispatcherCollector
dispatchers.put(dispatcherName, stats)
Some(stats)
}
}
case class CodahaleHistogram() extends Histogram {
private[this] val histogram = new com.codahale.metrics.Histogram(new metrics.ExponentiallyDecayingReservoir())
def update(value: Long) = histogram.update(value)
def snapshot: HistogramSnapshot = {
val snapshot = histogram.getSnapshot
CodahaleHistogramSnapshot(snapshot.getMedian, snapshot.getMax, snapshot.getMin)
}
}
case class CodahaleHistogramSnapshot(median: Double, max: Double, min: Double) extends HistogramSnapshot
/**
* Dispatcher Metrics that we care about currently with a histogram-like nature:
* - Work Queue Size
* - Total/Active Thread Count
*/
import annotation.tailrec
import java.util.concurrent.atomic.AtomicReference
object Atomic {
def apply[T]( obj : T) = new Atomic(new AtomicReference(obj))
implicit def toAtomic[T]( ref : AtomicReference[T]) : Atomic[T] = new Atomic(ref)
}
class Atomic[T](val atomic : AtomicReference[T]) {
@tailrec
final def update(f: T => T) : T = {
val oldValue = atomic.get()
val newValue = f(oldValue)
if (atomic.compareAndSet(oldValue, newValue)) newValue else update(f)
}
def get() = atomic.get()
}
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