{"action":"created","comment":{"url":"https://api.github.com/repos/akka/akka/pulls/comments/77371999","id":77371999,"diff_hunk":"@@ -43,15 +43,30 @@ import akka.util.OptionVal\n import org.agrona.concurrent.ManyToOneConcurrentArrayQueue\n import akka.remote.artery.compress.CompressionProtocol._\n import akka.stream.scaladsl.MergeHub\n+import java.util.concurrent.atomic.AtomicBoolean\n \n /**\n  * INTERNAL API\n  */\n private[remote] object Association {\n-  final case class QueueWrapper(queue: Queue[OutboundEnvelope]) extends SendQueue.ProducerApi[OutboundEnvelope] {\n+  sealed trait QueueWrapper extends SendQueue.ProducerApi[OutboundEnvelope] {\n+    def queue: Queue[OutboundEnvelope]\n+  }\n+\n+  final case class QueueWrapperImpl(queue: Queue[OutboundEnvelope]) extends QueueWrapper {\n     override def offer(message: OutboundEnvelope): Boolean = queue.offer(message)\n   }\n \n+  final case class LazyQueueWrapper(queue: Queue[OutboundEnvelope], materialize: () ⇒ Unit) extends QueueWrapper {\n+    private val onlyOnce = new AtomicBoolean\n+\n+    override def offer(message: OutboundEnvelope): Boolean = {\n+      if (onlyOnce.compareAndSet(false, true))\n+        materialize()\n+      queue.offer(message)","path":"akka-remote/src/main/scala/akka/remote/artery/Association.scala","position":25,"original_position":25,"commit_id":"5caedd98dc18888c4e2734e67a60f2b84fdfc483","original_commit_id":"5caedd98dc18888c4e2734e67a60f2b84fdfc483","user":{"login":"patriknw","id":336161,"avatar_url":"https://avatars.githubusercontent.com/u/336161?v=3","gravatar_id":"","url":"https://api.github.com/users/patriknw","html_url":"https://github.com/patriknw","followers_url":"https://api.github.com/users/patriknw/followers","following_url":"https://api.github.com/users/patriknw/following{/other_user}","gists_url":"https://api.github.com/users/patriknw/gists{/gist_id}","starred_url":"https://api.github.com/users/patriknw/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/patriknw/subscriptions","organizations_url":"https://api.github.com/users/patriknw/orgs","repos_url":"https://api.github.com/users/patriknw/repos","events_url":"https://api.github.com/users/patriknw/events{/privacy}","received_events_url":"https://api.github.com/users/patriknw/received_events","type":"User","site_admin":false},"body":"Yes, that is the same trick we use when the association is created. The queue is created outside and can be used immediately. It's then injected into the stage.","created_at":"2016-09-02T16:10:54Z","updated_at":"2016-09-02T16:10:54Z","html_url":"https://github.com/akka/akka/pull/21356#discussion_r77371999","pull_request_url":"https://api.github.com/repos/akka/akka/pulls/21356","_links":{"self":{"href":"https://api.github.com/repos/akka/akka/pulls/comments/77371999"},"html":{"href":"https://github.com/akka/akka/pull/21356#discussion_r77371999"},"pull_request":{"href":"https://api.github.com/repos/akka/akka/pulls/21356"}}},"pull_request":{"url":"https://api.github.com/repos/akka/akka/pulls/21356","id":83796794,"html_url":"https://github.com/akka/akka/pull/21356","diff_url":"https://github.com/akka/akka/pull/21356.diff","patch_url":"https://github.com/akka/akka/pull/21356.patch","issue_url":"https://api.github.com/repos/akka/akka/issues/21356","number":21356,"state":"open","locked":false,"title":"make restart materialization of outbound streams lazy, 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