diff options
Diffstat (limited to 'kamon-core/src/main/scala/kamon/trace/Sampler.scala')
-rw-r--r-- | kamon-core/src/main/scala/kamon/trace/Sampler.scala | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/trace/Sampler.scala b/kamon-core/src/main/scala/kamon/trace/Sampler.scala index a26e61be..491cf358 100644 --- a/kamon-core/src/main/scala/kamon/trace/Sampler.scala +++ b/kamon-core/src/main/scala/kamon/trace/Sampler.scala @@ -1,5 +1,32 @@ 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 + } + + class Random(chance: Double) extends Sampler { + val upperBoundary = Long.MaxValue * chance + val lowerBoundary = -upperBoundary + override def decide(spanID: Long): Boolean = + spanID >= lowerBoundary && spanID <= upperBoundary + } } |