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package kamon.trace
trait Sampler {
def decide(spanID: Long): Boolean
}
object Sampler {
val always = new Constant(true)
val never = new Constant(false)
def random(chance: Double): Sampler = {
assert(chance >= 0D && chance <= 1.0D, "Change should be >= 0 and <= 1.0")
chance match {
case 0D => never
case 1.0D => always
case anyOther => new Random(anyOther)
}
}
class Constant(decision: Boolean) extends Sampler {
override def decide(spanID: Long): Boolean = decision
override def toString: String =
s"Sampler.Constant(decision = $decision)"
}
class Random(chance: Double) extends Sampler {
val upperBoundary = Long.MaxValue * chance
val lowerBoundary = -upperBoundary
override def decide(spanID: Long): Boolean =
spanID >= lowerBoundary && spanID <= upperBoundary
override def toString: String =
s"Sampler.Random(chance = $chance)"
}
}
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