From 7a10c0ef2a6566229e8571f6d385ca2ff794cc20 Mon Sep 17 00:00:00 2001
From: Ivan Topolnak <itopolnak@despegar.com>
Date: Thu, 2 Jan 2014 18:09:53 -0300
Subject: integrate trace and metrics into the base project

---
 kamon-core/src/main/scala/kamon/trace/Trace.scala | 114 ++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 kamon-core/src/main/scala/kamon/trace/Trace.scala

(limited to 'kamon-core/src/main/scala/kamon/trace/Trace.scala')

diff --git a/kamon-core/src/main/scala/kamon/trace/Trace.scala b/kamon-core/src/main/scala/kamon/trace/Trace.scala
new file mode 100644
index 00000000..31e8185a
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/trace/Trace.scala
@@ -0,0 +1,114 @@
+/* ===================================================
+ * 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 kamon.Kamon
+import akka.actor._
+import scala.Some
+import kamon.trace.Trace.Register
+import scala.concurrent.duration._
+import java.util.concurrent.atomic.AtomicLong
+
+object Trace extends ExtensionId[TraceExtension] with ExtensionIdProvider {
+  def lookup(): ExtensionId[_ <: Extension] = Trace
+  def createExtension(system: ExtendedActorSystem): TraceExtension = new TraceExtension(system)
+
+  /*** Protocol */
+  case object Register
+
+  /** User API */
+  //private[trace] val traceContext = new DynamicVariable[Option[TraceContext]](None)
+  private[trace] val traceContext = new ThreadLocal[Option[TraceContext]] {
+    override def initialValue(): Option[TraceContext] = None
+  }
+  private[trace] val tranid = new AtomicLong()
+
+  def context() = traceContext.get
+  private def set(ctx: Option[TraceContext]) = traceContext.set(ctx)
+
+  def clear: Unit = traceContext.remove()
+  def start(name: String)(implicit system: ActorSystem): TraceContext = {
+    val ctx = newTraceContext(name)
+    ctx.start(name)
+    set(Some(ctx))
+
+    ctx
+  }
+
+  def withContext[T](ctx: Option[TraceContext])(thunk: ⇒ T): T = {
+    val oldval = context
+    set(ctx)
+
+    try thunk
+    finally set(oldval)
+  }
+
+  def transformContext(f: TraceContext ⇒ TraceContext): Unit = {
+    context.map(f).foreach(ctx ⇒ set(Some(ctx)))
+  }
+
+  def finish(): Option[TraceContext] = {
+    val ctx = context()
+    ctx.map(_.finish)
+    clear
+    ctx
+  }
+
+  // TODO: FIX
+  def newTraceContext(name: String)(implicit system: ActorSystem): TraceContext = TraceContext(Kamon(Trace).api, tranid.getAndIncrement, name)
+
+  def startSegment(category: Segments.Category, description: String = "", attributes: Map[String, String] = Map()): SegmentCompletionHandle = {
+    val start = Segments.Start(category, description, attributes)
+    SegmentCompletionHandle(start)
+  }
+
+  def startSegment(start: Segments.Start): SegmentCompletionHandle = SegmentCompletionHandle(start)
+
+  case class SegmentCompletionHandle(start: Segments.Start) {
+    def complete(): Unit = {
+      val end = Segments.End()
+      println(s"Completing the Segment: $start - $end")
+    }
+    def complete(end: Segments.End): Unit = {
+      println(s"Completing the Segment: $start - $end")
+    }
+  }
+}
+
+class TraceExtension(system: ExtendedActorSystem) extends Kamon.Extension {
+  val api: ActorRef = system.actorOf(Props[TraceManager], "kamon-trace")
+}
+
+class TraceManager extends Actor with ActorLogging {
+  var listeners: Seq[ActorRef] = Seq.empty
+
+  def receive = {
+    case Register ⇒
+      listeners = sender +: listeners
+      log.info("Registered [{}] as listener for Kamon traces", sender)
+
+    case segment: UowSegment ⇒
+      val tracerName = segment.id.toString
+      context.child(tracerName).getOrElse(newTracer(tracerName)) ! segment
+
+    case trace: UowTrace ⇒
+      listeners foreach (_ ! trace)
+  }
+
+  def newTracer(name: String): ActorRef = {
+    context.actorOf(UowTraceAggregator.props(self, 30 seconds), name)
+  }
+}
-- 
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