1 files changed, 82 insertions, 0 deletions
diff --git a/kamon-datadog/src/main/scala/kamon/datadog/Datadog.scala b/kamon-datadog/src/main/scala/kamon/datadog/Datadog.scala
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+++ b/kamon-datadog/src/main/scala/kamon/datadog/Datadog.scala
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+/*
+ * =========================================================================================
+ * Copyright © 2013-2014 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.datadog
+
+import akka.actor._
+import kamon.Kamon
+import kamon.metrics._
+import scala.concurrent.duration._
+import scala.collection.JavaConverters._
+import com.typesafe.config.Config
+import java.lang.management.ManagementFactory
+import akka.event.Logging
+import java.net.InetSocketAddress
+import java.util.concurrent.TimeUnit.MILLISECONDS
+
+object Datadog extends ExtensionId[DatadogExtension] with ExtensionIdProvider {
+  override def lookup(): ExtensionId[_ <: Extension] = Datadog
+  override def createExtension(system: ExtendedActorSystem): DatadogExtension = new DatadogExtension(system)
+
+  trait MetricKeyGenerator {
+    def generateKey(groupIdentity: MetricGroupIdentity, metricIdentity: MetricIdentity): String
+  }
+}
+
+class DatadogExtension(system: ExtendedActorSystem) extends Kamon.Extension {
+  val log = Logging(system, classOf[DatadogExtension])
+  log.info("Starting the Kamon(Datadog) extension")
+
+  private val datadogConfig = system.settings.config.getConfig("kamon.datadog")
+
+  val datadogHost = new InetSocketAddress(datadogConfig.getString("hostname"), datadogConfig.getInt("port"))
+  val flushInterval = datadogConfig.getDuration("flush-interval", MILLISECONDS)
+  val maxPacketSizeInBytes = datadogConfig.getBytes("max-packet-size")
+  val tickInterval = system.settings.config.getDuration("kamon.metrics.tick-interval", MILLISECONDS)
+
+  val datadogMetricsListener = buildMetricsListener(tickInterval, flushInterval)
+
+  // Subscribe to Actors
+  val includedActors = datadogConfig.getStringList("includes.actor").asScala
+  for (actorPathPattern ← includedActors) {
+    Kamon(Metrics)(system).subscribe(ActorMetrics, actorPathPattern, datadogMetricsListener, permanently = true)
+  }
+
+  // Subscribe to Traces
+  val includedTraces = datadogConfig.getStringList("includes.trace").asScala
+  for (tracePathPattern ← includedTraces) {
+    Kamon(Metrics)(system).subscribe(TraceMetrics, tracePathPattern, datadogMetricsListener, permanently = true)
+  }
+
+  // Subscribe to Dispatchers
+  val includedDispatchers = datadogConfig.getStringList("includes.dispatcher").asScala
+  for (dispatcherPathPattern ← includedDispatchers) {
+    Kamon(Metrics)(system).subscribe(DispatcherMetrics, dispatcherPathPattern, datadogMetricsListener, permanently = true)
+  }
+
+  def buildMetricsListener(tickInterval: Long, flushInterval: Long): ActorRef = {
+    assert(flushInterval >= tickInterval, "Datadog flush-interval needs to be equal or greater to the tick-interval")
+
+    val metricsTranslator = system.actorOf(DatadogMetricsSender.props(datadogHost, maxPacketSizeInBytes), "datadog-metrics-sender")
+    if (flushInterval == tickInterval) {
+      // No need to buffer the metrics, let's go straight to the metrics sender.
+      metricsTranslator
+    } else {
+      system.actorOf(TickMetricSnapshotBuffer.props(flushInterval.toInt.millis, metricsTranslator), "datadog-metrics-buffer")
+    }
+  }
+}
+