+ akka-cluster-metrics: new akka module

* new akka module split from akka-cluster
* provide sigar provisioning
* fix ewma usage
* resolve #16121
* see #16354

project/SigarLoader.scala

@@ -0,0 +1,60 @@
+/**
+ * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package akka
+
+import sbt._
+import sbt.Keys._
+
+/**
+ * Sigar java agent injection build settings.
+ */
+object SigarLoader {
+
+  import Dependencies.Compile.Provided.sigarLoader
+
+  /** Enable Sigar java agent injection during tests. */
+  lazy val sigarTestEnabled = sys.props.get("akka.test.sigar").getOrElse("false").toBoolean
+
+  lazy val sigarArtifact = TaskKey[File]("sigar-artifact", "Location of Sigar java agent jar.")
+
+  lazy val sigarOptions = TaskKey[String]("sigar-options", "JVM command line options for Sigar java agent.")
+
+  lazy val sigarFolder = SettingKey[File]("sigar-folder", "Location of native library extracted by Sigar java agent.")
+
+  /** Sigar agent command line option property. */
+  val sigarFolderProperty = "kamon.sigar.folder"
+
+  def provideSigarOptions = (sigarArtifact, sigarFolder) map { (artifact, folder) =>
+    "-javaagent:" + artifact + "=" + sigarFolderProperty + "=" + folder
+  }
+
+  def locateSigarArtifact = update map { report =>
+    val artifactList = report.matching(
+      moduleFilter(organization = sigarLoader.organization, name = sigarLoader.name)
+    )
+    require(artifactList.size == 1, "Expecting single artifact, while found: " + artifactList)
+    artifactList(0)
+  }
+
+  // TODO remove Sigar form test:test* classpath, it is provided by Sigar agent.
+  lazy val sigarSettings = {
+    Seq(
+      //
+      // Prepare Sigar agent options.
+      sigarArtifact <<= locateSigarArtifact,
+      sigarFolder := target.value / "native",
+      sigarOptions <<= provideSigarOptions,
+      //
+      fork in Test := true
+    ) ++ (
+        // Invoke Sigar agent at JVM init time, to extract and load native Sigar library.
+        if (sigarTestEnabled) Seq(
+          javaOptions in Test += sigarOptions.value
+        )
+        else Seq()
+      )
+  }
+
+}