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package kamon.metric
import kamon.metric.instrument.{ Counter, Histogram, CollectionContext, InstrumentSnapshot }
import kamon.util.MapMerge
import scala.reflect.ClassTag
trait EntitySnapshot {
def metrics: Map[MetricKey, InstrumentSnapshot]
def merge(that: EntitySnapshot, collectionContext: CollectionContext): EntitySnapshot
def histogram(name: String): Option[Histogram.Snapshot] =
find[HistogramKey, Histogram.Snapshot](name)
def minMaxCounter(name: String): Option[Histogram.Snapshot] =
find[MinMaxCounterKey, Histogram.Snapshot](name)
def gauge(name: String): Option[Histogram.Snapshot] =
find[GaugeKey, Histogram.Snapshot](name)
def counter(name: String): Option[Counter.Snapshot] =
find[CounterKey, Counter.Snapshot](name)
def histograms: Map[HistogramKey, Histogram.Snapshot] =
filterByType[HistogramKey, Histogram.Snapshot]
def minMaxCounters: Map[MinMaxCounterKey, Histogram.Snapshot] =
filterByType[MinMaxCounterKey, Histogram.Snapshot]
def gauges: Map[GaugeKey, Histogram.Snapshot] =
filterByType[GaugeKey, Histogram.Snapshot]
def counters: Map[CounterKey, Counter.Snapshot] =
filterByType[CounterKey, Counter.Snapshot]
private def filterByType[K <: MetricKey, V <: InstrumentSnapshot](implicit keyCT: ClassTag[K]): Map[K, V] =
metrics.collect { case (k, v) if keyCT.runtimeClass.isInstance(k) ⇒ (k.asInstanceOf[K], v.asInstanceOf[V]) }
private def find[K <: MetricKey, V <: InstrumentSnapshot](name: String)(implicit keyCT: ClassTag[K]) =
metrics.find { case (k, v) ⇒ keyCT.runtimeClass.isInstance(k) && k.name == name } map (_._2.asInstanceOf[V])
}
class DefaultEntitySnapshot(val metrics: Map[MetricKey, InstrumentSnapshot]) extends EntitySnapshot {
import MapMerge.Syntax
override def merge(that: EntitySnapshot, collectionContext: CollectionContext): EntitySnapshot =
new DefaultEntitySnapshot(metrics.merge(that.metrics, (l, r) ⇒ l.merge(r, collectionContext)))
}
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