diff options
author | Ivan Topolnak <itopolnak@despegar.com> | 2014-01-27 19:09:40 -0300 |
---|---|---|
committer | Ivan Topolnak <itopolnak@despegar.com> | 2014-01-27 19:09:40 -0300 |
commit | b6ea0a93e6be8e1f355f1bc993618d178d0c9372 (patch) | |
tree | a7d03a385e13df146df871f2a66c8f70eed8bc84 /kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala | |
parent | 003af1dd8ef1e3b4a8f1a9eff56a3c15c01cb2a9 (diff) | |
download | Kamon-b6ea0a93e6be8e1f355f1bc993618d178d0c9372.tar.gz Kamon-b6ea0a93e6be8e1f355f1bc993618d178d0c9372.tar.bz2 Kamon-b6ea0a93e6be8e1f355f1bc993618d178d0c9372.zip |
first implementation of a universal metrics repository for any kind of metrics we might be interested in
Diffstat (limited to 'kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala')
-rw-r--r-- | kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala b/kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala deleted file mode 100644 index c9e47792..00000000 --- a/kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala +++ /dev/null @@ -1,75 +0,0 @@ -/* - * ========================================================================================= - * Copyright © 2013 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 org.HdrHistogram - -import java.util.concurrent.atomic.AtomicLongFieldUpdater -import scala.annotation.tailrec -import org.HdrHistogram.AtomicSnapshotableHistogram.{ Value, Snapshot } - -/** - * This implementation aims to be used for real time data collection where data snapshots are taken often over time. - * The snapshotAndReset() operation extracts all the recorded values from the histogram and resets the counts, but still - * leave it in a consistent state even in the case of concurrent modification while the snapshot is being taken. - */ -class AtomicSnapshotableHistogram(highestTrackableValue: Long, numberOfSignificantValueDigits: Int) - extends AtomicHistogram(1L, highestTrackableValue, numberOfSignificantValueDigits) { - - import AtomicSnapshotableHistogram.totalCountUpdater - - def snapshotAndReset(): Snapshot = { - val entries = Vector.newBuilder[Value] - val countsLength = counts.length() - - @tailrec def iterate(index: Int, previousValue: Long, nrOfRecordings: Long, bucketLimit: Long, increment: Long): Long = { - if (index < countsLength) { - val currentValue = previousValue + increment - val countAtValue = counts.getAndSet(index, 0) - - if (countAtValue > 0) - entries += Value(currentValue, countAtValue) - - if (currentValue == bucketLimit) - iterate(index + 1, currentValue, nrOfRecordings + countAtValue, (bucketLimit << 1) + 1, increment << 1) - else - iterate(index + 1, currentValue, nrOfRecordings + countAtValue, bucketLimit, increment) - } else { - nrOfRecordings - } - } - - val nrOfRecordings = iterate(0, -1, 0, subBucketMask, 1) - - def tryUpdateTotalCount: Boolean = { - val previousTotalCount = getTotalCount - val newTotalCount = previousTotalCount - nrOfRecordings - - totalCountUpdater.compareAndSet(this, previousTotalCount, newTotalCount) - } - - while (!tryUpdateTotalCount) {} - - Snapshot(nrOfRecordings, entries.result()) - } - -} - -object AtomicSnapshotableHistogram { - val totalCountUpdater = AtomicLongFieldUpdater.newUpdater(classOf[AtomicHistogram], "totalCount") - - case class Snapshot(nrOfRecordings: Long, values: Vector[Value]) - case class Value(magnitude: Long, count: Long) -} |