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act Avoid deadletter access if not needed (#26422)

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Johannes Rudolph 2019-03-05 14:09:38 +01:00 • committed by GitHub
parent 27957649e8
commit 971bd5159e
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1 changed files with 4 additions and 1 deletions
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5
akka-actor/src/main/scala/akka/dispatch/Mailbox.scala
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@ -290,7 +290,10 @@ private[akka] abstract class Mailbox(val messageQueue: MessageQueue)
* if we closed the mailbox, we must dump the remaining system messages * if we closed the mailbox, we must dump the remaining system messages
* to deadLetters (this is essential for DeathWatch) * to deadLetters (this is essential for DeathWatch)
*/ */
val dlm = actor.dispatcher.mailboxes.deadLetterMailbox val dlm: Mailbox =
// MICRO-OPT: `actor` is volatile, so the access is slow enough to avoid if not needed
if (messageList.nonEmpty) actor.dispatcher.mailboxes.deadLetterMailbox
else null
while (messageList.nonEmpty) { while (messageList.nonEmpty) {
val msg = messageList.head val msg = messageList.head
messageList = messageList.tail messageList = messageList.tail