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package kamon.metric.instrument
import java.nio.LongBuffer
import akka.actor.{ Scheduler, Cancellable }
import akka.dispatch.MessageDispatcher
import scala.concurrent.duration.FiniteDuration
private[kamon] trait Instrument {
type SnapshotType <: InstrumentSnapshot
def collect(context: CollectionContext): SnapshotType
def cleanup: Unit
}
trait InstrumentSnapshot {
def merge(that: InstrumentSnapshot, context: CollectionContext): InstrumentSnapshot
}
class InstrumentType private[kamon] (val id: Int) extends AnyVal
object InstrumentTypes {
val Histogram = new InstrumentType(1)
val MinMaxCounter = new InstrumentType(2)
val Gauge = new InstrumentType(3)
val Counter = new InstrumentType(4)
}
trait CollectionContext {
def buffer: LongBuffer
}
object CollectionContext {
def apply(longBufferSize: Int): CollectionContext = new CollectionContext {
val buffer: LongBuffer = LongBuffer.allocate(longBufferSize)
}
}
trait RefreshScheduler {
def schedule(interval: FiniteDuration, refresh: () ⇒ Unit): Cancellable
}
object RefreshScheduler {
val NoopScheduler = new RefreshScheduler {
def schedule(interval: FiniteDuration, refresh: () ⇒ Unit): Cancellable = new Cancellable {
override def isCancelled: Boolean = true
override def cancel(): Boolean = true
}
}
def apply(scheduler: Scheduler, dispatcher: MessageDispatcher): RefreshScheduler = new RefreshScheduler {
def schedule(interval: FiniteDuration, refresh: () ⇒ Unit): Cancellable =
scheduler.schedule(interval, interval)(refresh.apply())(dispatcher)
}
def create(scheduler: Scheduler, dispatcher: MessageDispatcher): RefreshScheduler = apply(scheduler, dispatcher)
}
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