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 | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/kamon-core/src/main/scala/kamon/trace/Sampler.scala b/kamon-core/src/main/scala/kamon/trace/Sampler.scala deleted file mode 100644 index 234c67bb..00000000 --- a/kamon-core/src/main/scala/kamon/trace/Sampler.scala +++ /dev/null @@ -1,101 +0,0 @@ -/* - * ========================================================================================= - * Copyright © 2013-2014 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 - -import java.net.InetAddress -import java.util.concurrent.atomic.AtomicLong -import kamon.util.{NanoTimestamp, NanoInterval, Sequencer} -import scala.concurrent.forkjoin.ThreadLocalRandom - -import scala.util.Try - -trait Sampler { - def shouldTrace: Boolean - def shouldReport(traceElapsedTime: NanoInterval): Boolean -} - -object NoSampling extends Sampler { - def shouldTrace: Boolean = false - def shouldReport(traceElapsedTime: NanoInterval): Boolean = false -} - -object SampleAll extends Sampler { - def shouldTrace: Boolean = true - def shouldReport(traceElapsedTime: NanoInterval): 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(traceElapsedTime: NanoInterval): Boolean = true -} - -class OrderedSampler(interval: Int) extends Sampler { - import OrderedSampler._ - - require(interval > 0, "kamon.trace.ordered-sampler.sample-interval cannot be <= 0") - assume(interval isPowerOfTwo, "kamon.trace.ordered-sampler.sample-interval must be power of two") - - private val sequencer = Sequencer() - - def shouldTrace: Boolean = (sequencer.next() fastMod interval) == 0 - def shouldReport(traceElapsedTime: NanoInterval): Boolean = true -} - -object OrderedSampler { - implicit class EnhancedInt(i: Int) { - def isPowerOfTwo = (i & (i - 1)) == 0 - } - - implicit class EnhancedLong(dividend: Long) { - def fastMod(divisor: Int) = dividend & (divisor - 1) - } -} - -class ThresholdSampler(thresholdInNanoseconds: NanoInterval) extends Sampler { - require(thresholdInNanoseconds.nanos > 0, "kamon.trace.threshold-sampler.minimum-elapsed-time cannot be <= 0") - - def shouldTrace: Boolean = true - def shouldReport(traceElapsedTime: NanoInterval): Boolean = traceElapsedTime >= thresholdInNanoseconds -} - -class ClockSampler(pauseInNanoseconds: NanoInterval) extends Sampler { - require(pauseInNanoseconds.nanos > 0, "kamon.trace.clock-sampler.pause cannot be <= 0") - - private val timer: AtomicLong = new AtomicLong(0L) - - def shouldTrace: Boolean = { - val now = NanoTimestamp.now.nanos - val lastTimer = timer.get() - if ((lastTimer + pauseInNanoseconds.nanos) < now) - timer.compareAndSet(lastTimer, now) - else - false - } - def shouldReport(traceElapsedTime: NanoInterval): Boolean = true -} - -class DefaultTokenGenerator extends Function0[String] { - private val _hostnamePrefix = Try(InetAddress.getLocalHost.getHostName).getOrElse("unknown-localhost") - private val _tokenCounter = new AtomicLong - - def apply(): String = { - _hostnamePrefix + "-" + String.valueOf(_tokenCounter.incrementAndGet()) - } -}
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