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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._
import kamon.metric.TraceMetrics.ElapsedTime
import kamon.metric.instrument.Histogram
import kamon.trace.SegmentMetricIdentityLabel.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 transactionMetrics = metrics.collect {
case (TraceMetrics(name), groupSnapshot) ⇒
groupSnapshot.metrics collect {
// Extract WebTransaction metrics and accumulate HttpDispatcher
case (ElapsedTime, snapshot: Histogram.Snapshot) ⇒
accumulatedHttpDispatcher = accumulatedHttpDispatcher.merge(snapshot, collectionContext)
snapshot.recordsIterator.foreach { record ⇒
apdexBuilder.record(Scale.convert(snapshot.scale, Scale.Unit, record.level), record.count)
}
Metric.fromKamonMetricSnapshot(snapshot, s"WebTransaction/Custom/$name", None, Scale.Unit)
// Extract all external services.
case (SegmentMetricIdentity(segmentName, label), snapshot: Histogram.Snapshot) if label.equals(HttpClient) ⇒
accumulatedExternalServices = accumulatedExternalServices.merge(snapshot, collectionContext)
Metric.fromKamonMetricSnapshot(snapshot, s"External/$segmentName/all", None, Scale.Unit)
}
}
val httpDispatcher = Metric.fromKamonMetricSnapshot(accumulatedHttpDispatcher, "HttpDispatcher", None, Scale.Unit)
val webTransaction = Metric.fromKamonMetricSnapshot(accumulatedHttpDispatcher, "WebTransaction", None, Scale.Unit)
val external = Metric.fromKamonMetricSnapshot(accumulatedExternalServices, "External", None, Scale.Unit)
val externalAllWeb = Metric.fromKamonMetricSnapshot(accumulatedExternalServices, "External/allWeb", None, Scale.Unit)
Map(httpDispatcher, webTransaction, external, externalAllWeb, apdexBuilder.build) ++ transactionMetrics.flatten.toMap
}
}
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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