1 files changed, 94 insertions, 0 deletions
diff --git a/kamon-core/src/main/scala/kamon/trace/TracerExtension.scala b/kamon-core/src/main/scala/kamon/trace/TracerExtension.scala
new file mode 100644
index 00000000..41dcd6bc
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/trace/TracerExtension.scala
@@ -0,0 +1,94 @@
+/*
+ * =========================================================================================
+ * 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 java.net.InetAddress
+import java.util.concurrent.atomic.AtomicLong
+
+import akka.actor._
+import akka.actor
+import kamon.Kamon
+import kamon.metric.{ Metrics, MetricsExtension }
+import kamon.util.{ NanoInterval, RelativeNanoTimestamp, NanoTimestamp, GlobPathFilter }
+
+import scala.util.Try
+
+object Tracer extends ExtensionId[TracerExtension] with ExtensionIdProvider {
+  override def get(system: ActorSystem): TracerExtension = super.get(system)
+  def lookup(): ExtensionId[_ <: actor.Extension] = Tracer
+  def createExtension(system: ExtendedActorSystem): TracerExtension = new TracerExtensionImpl(system)
+}
+
+trait TracerExtension extends Kamon.Extension {
+  def newContext(name: String): TraceContext
+  def newContext(name: String, token: String): TraceContext
+  def newContext(name: String, token: String, timestamp: RelativeNanoTimestamp, isOpen: Boolean, isLocal: Boolean): TraceContext
+
+  def subscribe(subscriber: ActorRef): Unit
+  def unsubscribe(subscriber: ActorRef): Unit
+}
+
+class TracerExtensionImpl(system: ExtendedActorSystem) extends TracerExtension {
+  private val _settings = TraceSettings(system)
+  private val _metricsExtension = Metrics.get(system)
+
+  private val _hostnamePrefix = Try(InetAddress.getLocalHost.getHostName).getOrElse("unknown-localhost")
+  private val _tokenCounter = new AtomicLong
+  private val _subscriptions = system.actorOf(Props[TraceSubscriptions], "trace-subscriptions")
+  private val _incubator = system.actorOf(Incubator.props(_subscriptions))
+
+  private def newToken: String =
+    _hostnamePrefix + "-" + String.valueOf(_tokenCounter.incrementAndGet())
+
+  def newContext(name: String): TraceContext =
+    createTraceContext(name)
+
+  def newContext(name: String, token: String): TraceContext =
+    createTraceContext(name, token)
+
+  def newContext(name: String, token: String, timestamp: RelativeNanoTimestamp, isOpen: Boolean, isLocal: Boolean): TraceContext =
+    createTraceContext(name, token, timestamp, isOpen, isLocal)
+
+  private def createTraceContext(traceName: String, token: String = newToken, startTimestamp: RelativeNanoTimestamp = RelativeNanoTimestamp.now,
+    isOpen: Boolean = true, isLocal: Boolean = true): TraceContext = {
+
+    def newMetricsOnlyContext = new MetricsOnlyContext(traceName, token, isOpen, _settings.levelOfDetail, startTimestamp, null, _metricsExtension, system)
+
+    if (_settings.levelOfDetail == LevelOfDetail.MetricsOnly || !isLocal)
+      newMetricsOnlyContext
+    else {
+      if (!_settings.sampler.shouldTrace)
+        newMetricsOnlyContext
+      else
+        new TracingContext(traceName, token, true, _settings.levelOfDetail, isLocal, startTimestamp, null, _metricsExtension, this, system, dispatchTracingContext)
+    }
+  }
+
+  def subscribe(subscriber: ActorRef): Unit = _subscriptions ! TraceSubscriptions.Subscribe(subscriber)
+  def unsubscribe(subscriber: ActorRef): Unit = _subscriptions ! TraceSubscriptions.Unsubscribe(subscriber)
+
+  private[kamon] def dispatchTracingContext(trace: TracingContext): Unit =
+    if (_settings.sampler.shouldReport(trace.elapsedTime))
+      if (trace.shouldIncubate)
+        _incubator ! trace
+      else
+        _subscriptions ! trace.generateTraceInfo
+
+}
+
+case class TraceInfo(name: String, token: String, timestamp: NanoTimestamp, elapsedTime: NanoInterval, metadata: Map[String, String], segments: List[SegmentInfo])
+case class SegmentInfo(name: String, category: String, library: String, timestamp: NanoTimestamp, elapsedTime: NanoInterval, metadata: Map[String, String])
+\ No newline at end of file