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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 kamon.metric.{ EntitySnapshot, Entity }
import kamon.trace.SegmentCategory
import scala.collection.mutable
import kamon.metric.instrument.{ Time, CollectionContext, Histogram }
object WebTransactionMetricExtractor extends MetricExtractor {
def extract(settings: AgentSettings, collectionContext: CollectionContext, metrics: Map[Entity, EntitySnapshot]): Map[MetricID, MetricData] = {
val apdexBuilder = new ApdexBuilder("Apdex", None, settings.apdexT)
// Trace metrics are recorded in nanoseconds.
var accumulatedHttpDispatcher: Histogram.Snapshot = Histogram.Snapshot.empty
var accumulatedExternalServices: Histogram.Snapshot = Histogram.Snapshot.empty
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.filterKeys(_.category == "trace").map {
case (entity, entitySnapshot) ⇒
val elapsedTime = entitySnapshot.histogram("elapsed-time").get
accumulatedHttpDispatcher = accumulatedHttpDispatcher.merge(elapsedTime, collectionContext)
elapsedTime.recordsIterator.foreach { record ⇒
apdexBuilder.record(Time.Nanoseconds.scale(Time.Seconds)(record.level), record.count)
}
Metric(elapsedTime, Time.Nanoseconds, "WebTransaction/Custom/" + entity.name, None)
}
// Accumulate all segment metrics
metrics.filterKeys(_.category == "trace-segment").map {
case (entity, entitySnapshot) if entity.tags("category") == SegmentCategory.HttpClient ⇒
val library = entity.tags("library")
val trace = entity.tags("trace")
val elapsedTime = entitySnapshot.histogram("elapsed-time").get
accumulatedExternalServices = accumulatedExternalServices.merge(elapsedTime, collectionContext)
// Accumulate externals by host
externalByHostSnapshots.update(entity.name, elapsedTime :: externalByHostSnapshots.getOrElse(entity.name, Nil))
// Accumulate externals by host and library
externalByHostAndLibrarySnapshots.update((entity.name, library),
elapsedTime :: externalByHostAndLibrarySnapshots.getOrElse((entity.name, library), Nil))
// Accumulate externals by host and library, including the transaction as scope.
externalScopedByHostAndLibrarySnapshots.update((entity.name, library, trace),
elapsedTime :: externalScopedByHostAndLibrarySnapshots.getOrElse((entity.name, library, trace), Nil))
}
val httpDispatcher = Metric(accumulatedHttpDispatcher, Time.Nanoseconds, "HttpDispatcher", None)
val webTransaction = httpDispatcher.copy(MetricID("WebTransaction", None))
val webTransactionTotal = httpDispatcher.copy(MetricID("WebTransactionTotalTime", None))
val externalAllWeb = Metric(accumulatedExternalServices, Time.Nanoseconds, "External/allWeb", None)
val externalAll = externalAllWeb.copy(MetricID("External/all", None))
val externalByHost = externalByHostSnapshots.map {
case (host, snapshots) ⇒
val mergedSnapshots = snapshots.foldLeft(Histogram.Snapshot.empty)(_.merge(_, collectionContext))
Metric(mergedSnapshots, Time.Nanoseconds, s"External/$host/all", None)
}
val externalByHostAndLibrary = externalByHostAndLibrarySnapshots.map {
case ((host, library), snapshots) ⇒
val mergedSnapshots = snapshots.foldLeft(Histogram.Snapshot.empty)(_.merge(_, collectionContext))
Metric(mergedSnapshots, Time.Nanoseconds, s"External/$host/$library", None)
}
val externalScopedByHostAndLibrary = externalScopedByHostAndLibrarySnapshots.map {
case ((host, library, traceName), snapshots) ⇒
val mergedSnapshots = snapshots.foldLeft(Histogram.Snapshot.empty)(_.merge(_, collectionContext))
Metric(mergedSnapshots, Time.Nanoseconds, s"External/$host/$library", Some("WebTransaction/Custom/" + traceName))
}
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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