{"action":"created","comment":{"url":"https://api.github.com/repos/akka/akka/pulls/comments/45360482","id":45360482,"diff_hunk":"@@ -0,0 +1,123 @@\n+/**\n+ * Copyright (C) 2015 Typesafe Inc. <http://www.typesafe.com>\n+ */\n+package akka.stream.impl\n+\n+import akka.stream.ThrottleMode.{ EnforcingMode, ShapingMode }\n+import akka.stream.impl.fusing.GraphStages.SimpleLinearGraphStage\n+import akka.stream.stage._\n+import akka.stream._\n+\n+import scala.concurrent.duration.{ FiniteDuration, _ }\n+import scala.util.control.NonFatal\n+\n+/**\n+ * INTERNAL API\n+ */\n+private[stream] trait ThrottleTimeCalculationHelper {\n+  def now(): Long = System.currentTimeMillis()\n+\n+  def calculateSpeed(counter: Double, time: FiniteDuration): Long =\n+    ((counter / time.toMillis) * 1024 * 1024).toLong\n+\n+  def scale(e: Int): Long = e.toLong << 20\n+}\n+\n+/**\n+ * INTERNAL API\n+ */\n+private[stream] abstract class AbstractThrottle[T](cost: Int,\n+                                                   per: FiniteDuration,\n+                                                   maximumBurst: Int,\n+                                                   mode: ThrottleMode)\n+  extends SimpleLinearGraphStage[T] with ThrottleTimeCalculationHelper {\n+\n+  def calculateElementCost(elem: T): Long\n+  val timerName: String\n+\n+  val enforcedModeException = new IllegalStateException(\"Maximum throttle throughput exceeded\")\n+\n+  override def createLogic(inheritedAttributes: Attributes): GraphStageLogic = new TimerGraphStageLogic(shape) {\n+    var willStop = false\n+    var lastTokens: Long = 0\n+    var previousTime: Long = 0\n+\n+    var currentElement: Option[T] = None\n+\n+    setHandler(in, new InHandler {\n+      val scaledMaximumBurst = scale(maximumBurst)\n+\n+      override def onUpstreamFinish(): Unit =\n+        if (isAvailable(out) && isTimerActive(timerName)) willStop = true\n+        else completeStage()\n+\n+      override def onPush(): Unit = {\n+        val timeElapsed = now() - previousTime\n+        val speed = calculateSpeed(cost, per)","path":"akka-stream/src/main/scala/akka/stream/impl/Throttle.scala","position":56,"original_position":56,"commit_id":"e751ad2bdf9d7a36bc1520a52e52537858382733","original_commit_id":"e751ad2bdf9d7a36bc1520a52e52537858382733","user":{"login":"drewhk","id":932285,"avatar_url":"https://avatars.githubusercontent.com/u/932285?v=3","gravatar_id":"","url":"https://api.github.com/users/drewhk","html_url":"https://github.com/drewhk","followers_url":"https://api.github.com/users/drewhk/followers","following_url":"https://api.github.com/users/drewhk/following{/other_user}","gists_url":"https://api.github.com/users/drewhk/gists{/gist_id}","starred_url":"https://api.github.com/users/drewhk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/drewhk/subscriptions","organizations_url":"https://api.github.com/users/drewhk/orgs","repos_url":"https://api.github.com/users/drewhk/repos","events_url":"https://api.github.com/users/drewhk/events{/privacy}","received_events_url":"https://api.github.com/users/drewhk/received_events","type":"User","site_admin":false},"body":"You can extract this from the method so it is only calculated once, not per `onPush`","created_at":"2015-11-19T16:09:52Z","updated_at":"2015-11-19T16:09:52Z","html_url":"https://github.com/akka/akka/pull/18887#discussion_r45360482","pull_request_url":"https://api.github.com/repos/akka/akka/pulls/18887","_links":{"self":{"href":"https://api.github.com/repos/akka/akka/pulls/comments/45360482"},"html":{"href":"https://github.com/akka/akka/pull/18887#discussion_r45360482"},"pull_request":{"href":"https://api.github.com/repos/akka/akka/pulls/18887"}}},"pull_request":{"url":"https://api.github.com/repos/akka/akka/pulls/18887","id":50075390,"html_url":"https://github.com/akka/akka/pull/18887","diff_url":"https://github.com/akka/akka/pull/18887.diff","patch_url":"https://github.com/akka/akka/pull/18887.patch","issue_url":"https://api.github.com/repos/akka/akka/issues/18887","number":18887,"state":"open","locked":false,"title":"=str #18555 add throttle 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