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/*
* =========================================================================================
* 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 kamon.newrelic
import scala.collection.mutable;
import kamon.metric._
import kamon.metric.TraceMetrics.{ TraceMetricsSnapshot, ElapsedTime }
import kamon.metric.instrument.Histogram
import kamon.trace.SegmentCategory.HttpClient
import kamon.trace.SegmentMetricIdentity
object WebTransactionMetricExtractor extends MetricExtractor {
def extract(settings: Agent.Settings, collectionContext: CollectionContext, metrics: Map[MetricGroupIdentity, MetricGroupSnapshot]): Map[MetricID, MetricData] = {
val apdexBuilder = new ApdexBuilder("Apdex", None, settings.apdexT)
// Trace metrics are recorded in nanoseconds.
var accumulatedHttpDispatcher: Histogram.Snapshot = Histogram.Snapshot.empty(Scale.Nano)
var accumulatedExternalServices: Histogram.Snapshot = Histogram.Snapshot.empty(Scale.Nano)
val externalByHostSnapshots = mutable.Map.empty[String, List[Histogram.Snapshot]]
val externalByHostAndLibrarySnapshots = mutable.Map.empty[(String, String), List[Histogram.Snapshot]]
val externalScopedByHostAndLibrarySnapshots = mutable.Map.empty[(String, String, String), List[Histogram.Snapshot]]
val transactionMetrics = metrics.collect {
case (TraceMetrics(traceName), tms: TraceMetricsSnapshot) ⇒
tms.segments.foreach {
case (SegmentMetricIdentity(segmentName, category, library), snapshot: Histogram.Snapshot) if category.equals(HttpClient) ⇒
accumulatedExternalServices = accumulatedExternalServices.merge(snapshot, collectionContext)
// Accumulate externals by host
externalByHostSnapshots.update(segmentName, snapshot :: externalByHostSnapshots.getOrElse(segmentName, Nil))
// Accumulate externals by host and library
externalByHostAndLibrarySnapshots.update((segmentName, library),
snapshot :: externalByHostAndLibrarySnapshots.getOrElse((segmentName, library), Nil))
// Accumulate externals by host and library, including the transaction as scope.
externalScopedByHostAndLibrarySnapshots.update((segmentName, library, traceName),
snapshot :: externalScopedByHostAndLibrarySnapshots.getOrElse((segmentName, library, traceName), Nil))
}
accumulatedHttpDispatcher = accumulatedHttpDispatcher.merge(tms.elapsedTime, collectionContext)
tms.elapsedTime.recordsIterator.foreach { record ⇒
apdexBuilder.record(Scale.convert(tms.elapsedTime.scale, Scale.Unit, record.level), record.count)
}
Metric.fromKamonMetricSnapshot(tms.elapsedTime, "WebTransaction/Custom/" + traceName, None, Scale.Unit)
}
val httpDispatcher = Metric.fromKamonMetricSnapshot(accumulatedHttpDispatcher, "HttpDispatcher", None, Scale.Unit)
val webTransaction = httpDispatcher.copy(MetricID("WebTransaction", None))
val webTransactionTotal = httpDispatcher.copy(MetricID("WebTransactionTotalTime", None))
val externalAllWeb = Metric.fromKamonMetricSnapshot(accumulatedExternalServices, "External/allWeb", None, Scale.Unit)
val externalAll = externalAllWeb.copy(MetricID("External/all", None))
val externalByHost = externalByHostSnapshots.map {
case (host, snapshots) ⇒
val mergedSnapshots = snapshots.foldLeft(Histogram.Snapshot.empty(Scale.Nano))(_.merge(_, collectionContext))
Metric.fromKamonMetricSnapshot(mergedSnapshots, s"External/$host/all", None, Scale.Unit)
}
val externalByHostAndLibrary = externalByHostAndLibrarySnapshots.map {
case ((host, library), snapshots) ⇒
val mergedSnapshots = snapshots.foldLeft(Histogram.Snapshot.empty(Scale.Nano))(_.merge(_, collectionContext))
Metric.fromKamonMetricSnapshot(mergedSnapshots, s"External/$host/$library", None, Scale.Unit)
}
val externalScopedByHostAndLibrary = externalScopedByHostAndLibrarySnapshots.map {
case ((host, library, traceName), snapshots) ⇒
val mergedSnapshots = snapshots.foldLeft(Histogram.Snapshot.empty(Scale.Nano))(_.merge(_, collectionContext))
Metric.fromKamonMetricSnapshot(mergedSnapshots, s"External/$host/$library", Some("WebTransaction/Custom/" + traceName), Scale.Unit)
}
Map(httpDispatcher, webTransaction, webTransactionTotal, externalAllWeb, externalAll, apdexBuilder.build) ++
transactionMetrics ++ externalByHost ++ externalByHostAndLibrary ++ externalScopedByHostAndLibrary
}
}
class ApdexBuilder(name: String, scope: Option[String], apdexT: Double) {
val frustratingThreshold = 4 * apdexT
var satisfying = 0L
var tolerating = 0L
var frustrating = 0L
def record(duration: Double, count: Long): Unit =
if (duration <= apdexT)
satisfying += count
else if (duration <= frustratingThreshold)
tolerating += count
else
frustrating += count
// NewRelic reuses the same metric structure for recording the Apdex.. weird, but that's how it works.
def build: Metric = (MetricID(name, scope), MetricData(satisfying, tolerating, frustrating, apdexT, apdexT, 0))
}
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