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/* =========================================================================================
* Copyright © 2013-2017 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
* =========================================================================================
*/
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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