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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.trace
import akka.actor.ActorSystem
import kamon.Kamon
import kamon.metrics.{ MetricGroupRecorder, MetricIdentity, TraceMetrics, Metrics }
import java.util.concurrent.ConcurrentLinkedQueue
import kamon.trace.TraceContextAware.DefaultTraceContextAware
import kamon.trace.TraceContext.SegmentIdentity
trait TraceContext {
def name: String
def token: String
def system: ActorSystem
def rename(name: String): Unit
def levelOfDetail: TracingLevelOfDetail
def startSegment(identity: SegmentIdentity, metadata: Map[String, String]): SegmentCompletionHandle
def finish(metadata: Map[String, String])
}
object TraceContext {
type SegmentIdentity = MetricIdentity
}
trait SegmentCompletionHandle {
def finish(metadata: Map[String, String])
}
case class SegmentData(identity: MetricIdentity, duration: Long, metadata: Map[String, String])
sealed trait TracingLevelOfDetail
case object OnlyMetrics extends TracingLevelOfDetail
case object SimpleTrace extends TracingLevelOfDetail
case object FullTrace extends TracingLevelOfDetail
trait TraceContextAware {
def captureMark: Long
def traceContext: Option[TraceContext]
}
object TraceContextAware {
def default: TraceContextAware = new DefaultTraceContextAware
class DefaultTraceContextAware extends TraceContextAware {
val captureMark = System.nanoTime()
val traceContext = TraceRecorder.currentContext
}
}
trait SegmentCompletionHandleAware extends TraceContextAware {
@volatile var segmentCompletionHandle: Option[SegmentCompletionHandle] = None
}
object SegmentCompletionHandleAware {
def default: SegmentCompletionHandleAware = new DefaultSegmentCompletionHandleAware
class DefaultSegmentCompletionHandleAware extends DefaultTraceContextAware with SegmentCompletionHandleAware {}
}
class SimpleMetricCollectionContext(@volatile private var _name: String, val token: String, metadata: Map[String, String],
val system: ActorSystem) extends TraceContext {
@volatile private var _isOpen = true
val levelOfDetail = OnlyMetrics
val startMark = System.nanoTime()
val finishedSegments = new ConcurrentLinkedQueue[SegmentData]()
val metricsExtension = Kamon(Metrics)(system)
def name: String = _name
def rename(newName: String): Unit = _name = newName
def isOpen(): Boolean = _isOpen
def finish(metadata: Map[String, String]): Unit = {
_isOpen = false
val finishMark = System.nanoTime()
val metricRecorder = metricsExtension.register(TraceMetrics(name), TraceMetrics.Factory)
metricRecorder.map { traceMetrics ⇒
traceMetrics.elapsedTime.record(finishMark - startMark)
drainFinishedSegments(traceMetrics)
}
}
private def drainFinishedSegments(metricRecorder: MetricGroupRecorder): Unit = {
while (!finishedSegments.isEmpty) {
val segmentData = finishedSegments.poll()
metricRecorder.record(segmentData.identity, segmentData.duration)
}
}
private def finishSegment(identity: MetricIdentity, duration: Long, metadata: Map[String, String]): Unit = {
finishedSegments.add(SegmentData(identity, duration, metadata))
if (!_isOpen) {
metricsExtension.register(TraceMetrics(name), TraceMetrics.Factory).map { traceMetrics ⇒
drainFinishedSegments(traceMetrics)
}
}
}
def startSegment(identity: SegmentIdentity, metadata: Map[String, String]): SegmentCompletionHandle =
new SimpleMetricCollectionCompletionHandle(identity, metadata)
class SimpleMetricCollectionCompletionHandle(identity: MetricIdentity, startMetadata: Map[String, String]) extends SegmentCompletionHandle {
val segmentStartMark = System.nanoTime()
def finish(metadata: Map[String, String] = Map.empty): Unit = {
val segmentFinishMark = System.nanoTime()
finishSegment(identity, (segmentFinishMark - segmentStartMark), startMetadata ++ metadata)
}
}
}
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