diff options
author | Ivan Topolnjak <ivantopo@gmail.com> | 2014-01-28 01:25:51 -0300 |
---|---|---|
committer | Ivan Topolnjak <ivantopo@gmail.com> | 2014-01-28 01:25:51 -0300 |
commit | 01450abea84a4c0f9f4efe73201a8ca041acea2b (patch) | |
tree | 601b76380bd5c3ba405d6b480ddd1090b574ea98 /kamon-core/src/main/scala/kamon/metrics/instruments | |
parent | b6ea0a93e6be8e1f355f1bc993618d178d0c9372 (diff) | |
download | Kamon-01450abea84a4c0f9f4efe73201a8ca041acea2b.tar.gz Kamon-01450abea84a4c0f9f4efe73201a8ca041acea2b.tar.bz2 Kamon-01450abea84a4c0f9f4efe73201a8ca041acea2b.zip |
store actor metrics in the new metrics extension
Diffstat (limited to 'kamon-core/src/main/scala/kamon/metrics/instruments')
-rw-r--r-- | kamon-core/src/main/scala/kamon/metrics/instruments/HighDynamicRangeRecorder.scala | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/metrics/instruments/HighDynamicRangeRecorder.scala b/kamon-core/src/main/scala/kamon/metrics/instruments/HighDynamicRangeRecorder.scala new file mode 100644 index 00000000..e31d0e11 --- /dev/null +++ b/kamon-core/src/main/scala/kamon/metrics/instruments/HighDynamicRangeRecorder.scala @@ -0,0 +1,86 @@ +/* + * ========================================================================================= + * 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 kamon.metrics.{ DefaultMetricSnapshot, MetricSnapshot, MetricRecorder } +import com.typesafe.config.Config +import org.HdrHistogram.HighDynamicRangeRecorder.Configuration + +/** + * 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 HighDynamicRangeRecorder(configuration: Configuration) + extends AtomicHistogram(1L, configuration.highestTrackableValue, configuration.significantValueDigits) with MetricRecorder { + + import HighDynamicRangeRecorder.totalCountUpdater + + def record(value: Long): Unit = recordValue(value) + + def collect(): MetricSnapshot = { + val entries = Vector.newBuilder[MetricSnapshot.Measurement] + 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 += MetricSnapshot.Measurement(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) {} + + DefaultMetricSnapshot(nrOfRecordings, entries.result()) + } + +} + +object HighDynamicRangeRecorder { + val totalCountUpdater = AtomicLongFieldUpdater.newUpdater(classOf[AtomicHistogram], "totalCount") + + def apply(configuration: Configuration): HighDynamicRangeRecorder = new HighDynamicRangeRecorder(configuration) + + case class Configuration(highestTrackableValue: Long, significantValueDigits: Int) + + case object Configuration { + def fromConfig(config: Config): Configuration = { + Configuration(config.getLong("highest-trackable-value"), config.getInt("significant-value-digits")) + } + } +} |