From b6ea0a93e6be8e1f355f1bc993618d178d0c9372 Mon Sep 17 00:00:00 2001
From: Ivan Topolnak <itopolnak@despegar.com>
Date: Mon, 27 Jan 2014 19:09:40 -0300
Subject: first implementation of a universal metrics repository for any kind
 of metrics we might be interested in

---
 .../metrics/AtomicSnapshotableHistogram.scala      | 75 ----------------------
 1 file changed, 75 deletions(-)
 delete mode 100644 kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala

(limited to 'kamon-core/src/main/scala/kamon/metrics/AtomicSnapshotableHistogram.scala')

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)
-}
-- 
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