From 4247aa319ac6e17b7ef7a76d61bac32c872575e3 Mon Sep 17 00:00:00 2001
From: Ivan Topolnjak <ivantopo@gmail.com>
Date: Tue, 2 May 2017 13:18:26 +0200
Subject: wip: playing with akka-less implementation of subscriptions

---
 .../main/scala/kamon/metric/EntityRecorder.scala   | 48 +++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

(limited to 'kamon-core/src/main/scala/kamon/metric/EntityRecorder.scala')

diff --git a/kamon-core/src/main/scala/kamon/metric/EntityRecorder.scala b/kamon-core/src/main/scala/kamon/metric/EntityRecorder.scala
index a94881d2..8ce37082 100644
--- a/kamon-core/src/main/scala/kamon/metric/EntityRecorder.scala
+++ b/kamon-core/src/main/scala/kamon/metric/EntityRecorder.scala
@@ -5,6 +5,8 @@ import java.time.Duration
 import kamon.metric.instrument._
 import kamon.util.MeasurementUnit
 
+import scala.collection.concurrent.TrieMap
+
 trait EntityRecorder {
   def histogram(name: String): Histogram
   def histogram(name: String, measurementUnit: MeasurementUnit, dynamicRange: DynamicRange): Histogram
@@ -13,11 +15,55 @@ trait EntityRecorder {
   def minMaxCounter(name: String, measurementUnit: MeasurementUnit, dynamicRange: DynamicRange, sampleFrequency: Duration): MinMaxCounter
 
   def gauge(name: String): Gauge
+  def gauge(name: String, measurementUnit: MeasurementUnit): Gauge
 
   def counter(name: String): Counter
+  def counter(name: String, measurementUnit: MeasurementUnit): Counter
+}
+
+trait EntitySnapshotProducer {
+  def snapshot(): EntitySnapshot
 }
 
 
-class EntityRecorderImpl {
 
+
+class DefaultEntityRecorder(entity: Entity, instrumentFactory: InstrumentFactory) extends EntityRecorder with EntitySnapshotProducer {
+  private val histograms = TrieMap.empty[String, Histogram with DistributionSnapshotInstrument]
+  private val minMaxCounters = TrieMap.empty[String, MinMaxCounter with DistributionSnapshotInstrument]
+  private val counters = TrieMap.empty[String, Counter with SingleValueSnapshotInstrument]
+  private val gauges = TrieMap.empty[String, Gauge with SingleValueSnapshotInstrument]
+
+  def histogram(name: String): Histogram =
+    histograms.atomicGetOrElseUpdate(name, instrumentFactory.buildHistogram(entity, name))
+
+  def histogram(name: String, measurementUnit: MeasurementUnit, dynamicRange: DynamicRange): Histogram =
+    histograms.atomicGetOrElseUpdate(name, instrumentFactory.buildHistogram(entity, name, dynamicRange, measurementUnit))
+
+  def minMaxCounter(name: String): MinMaxCounter =
+    minMaxCounters.atomicGetOrElseUpdate(name, instrumentFactory.buildMinMaxCounter(entity, name))
+
+  def minMaxCounter(name: String, measurementUnit: MeasurementUnit, dynamicRange: DynamicRange, sampleFrequency: Duration): MinMaxCounter =
+    minMaxCounters.atomicGetOrElseUpdate(name, instrumentFactory.buildMinMaxCounter(entity, name, dynamicRange, sampleFrequency, measurementUnit))
+
+  def gauge(name: String): Gauge =
+    gauges.atomicGetOrElseUpdate(name, instrumentFactory.buildGauge(entity, name))
+
+  def gauge(name: String, measurementUnit: MeasurementUnit): Gauge =
+    gauges.atomicGetOrElseUpdate(name, instrumentFactory.buildGauge(entity, name, measurementUnit))
+
+  def counter(name: String): Counter =
+    counters.atomicGetOrElseUpdate(name, instrumentFactory.buildCounter(entity, name))
+
+  def counter(name: String, measurementUnit: MeasurementUnit): Counter =
+    counters.atomicGetOrElseUpdate(name, instrumentFactory.buildCounter(entity, name, measurementUnit))
+
+  def snapshot(): EntitySnapshot =
+    new EntitySnapshot(
+      entity,
+      histograms = histograms.values.map(_.snapshot()).toSeq,
+      minMaxCounters = minMaxCounters.values.map(_.snapshot()).toSeq,
+      gauges = gauges.values.map(_.snapshot()).toSeq,
+      counters = counters.values.map(_.snapshot()).toSeq
+    )
 }
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