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    <p>One way to avoid blocking while waiting for a reply is to send using the <code>ask</code> method—a.k.a. <code>?</code> operator—which returns a <code>Future</code> (unlike <code>!</code> which returns <code>()</code>).</p> <p>Using the <code>onSuccess</code> or <code>foreach</code> methods, you can specify actions to be performed if/when the future is completed with a reply. To use this you need to mix in the <a href="http://doc.akka.io/api/akka/2.0.3/#akka.pattern.AskSupport" rel="nofollow"><code>AskSupport</code></a> trait:</p> <pre><code>class ApplicationApi(asyncIo : ActorRef) extends Actor with AskSupport { def receive = { case request: GetUser =&gt; val replyTo = sender asyncIo ? AsyncGet("http://app/user/" + request.userId) onSuccess { case response: AsyncResponse =&gt; val user = parseUser(response.body) replyTo ! GetUserResponse(user) } } </code></pre> <p>Avoid using this technique to perform any side effect that modifies the state of the <code>ApplicationApi</code> actor, because the effect will happen out-of-sync with the receive loop. Forwarding messages to other actors should be safe, though.</p> <hr> <p>By the way, here is a trick to capture the current <code>sender</code> as part of the pattern match, avoiding the need to assign it to a variable later.</p> <pre><code>trait FromSupport { this: Actor =&gt; case object from { def unapply(msg: Any) = Some(msg, sender) } } class MyActor extends Actor with FromSupport { def receive = { case (request: GetUser) from sender =&gt; // sender is now a variable (shadowing the method) that is safe to use in a closure } } </code></pre>
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    1. COI think you are correct; I forgot that `sender` is a mutable property of the Actor and not just a variable that can be closed over.
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    2. COthat infix extractor is really interesting
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