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package kamon.trace
import java.util.concurrent.atomic.AtomicLong
import scala.concurrent.forkjoin.ThreadLocalRandom
trait Sampler {
def shouldTrace: Boolean
def shouldReport(traceElapsedNanoTime: Long): Boolean
}
object NoSampling extends Sampler {
def shouldTrace: Boolean = false
def shouldReport(traceElapsedNanoTime: Long): Boolean = false
}
object SampleAll extends Sampler {
def shouldTrace: Boolean = true
def shouldReport(traceElapsedNanoTime: Long): Boolean = true
}
class RandomSampler(chance: Int) extends Sampler {
require(chance > 0, "kamon.trace.random-sampler.chance cannot be <= 0")
require(chance <= 100, "kamon.trace.random-sampler.chance cannot be > 100")
def shouldTrace: Boolean = ThreadLocalRandom.current().nextInt(100) <= chance
def shouldReport(traceElapsedNanoTime: Long): Boolean = true
}
class OrderedSampler(interval: Int) extends Sampler {
require(interval > 0, "kamon.trace.ordered-sampler.interval cannot be <= 0")
private val counter = new AtomicLong(0L)
def shouldTrace: Boolean = counter.incrementAndGet() % interval == 0
// TODO: find a more efficient way to do this, protect from long overflow.
def shouldReport(traceElapsedNanoTime: Long): Boolean = true
}
class ThresholdSampler(thresholdInNanoseconds: Long) extends Sampler {
require(thresholdInNanoseconds > 0, "kamon.trace.threshold-sampler.minimum-elapsed-time cannot be <= 0")
def shouldTrace: Boolean = true
def shouldReport(traceElapsedNanoTime: Long): Boolean = traceElapsedNanoTime >= thresholdInNanoseconds
}
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