- Create a directory for our project files.
-
Create
helloworld.scala
in the project directory.import akka.actor._ import akka.pattern.ask import akka.util.duration._ import akka.util.Timeout case class Print(s: String) case object PrintAck class Printer extends Actor { def receive = { case Print(s) => { println(s) sender ! PrintAck } } } object HelloWorld { def main(args: Array[String]) { val system = ActorSystem("HelloWorld") val printer = system.actorOf(Props[Printer]) implicit val timeout = Timeout(5 seconds) (printer ? Print("Hello world")) onComplete { _ => system.shutdown() } } }
-
Create
build.sbt
in the project directory.name := "Akka Hello World" version := "1.0" scalaVersion := "2.9.2" resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/" libraryDependencies += "com.typesafe.akka" % "akka-actor" % "2.0.3"
- Download the latest SBT launch JAR and install it somewhere. This JAR bootstraps SBT and builds the project. I downloaded the 0.12.1 version. You can get the location of the latest version from the SBT Manual Installation instructions on the SBT website.
-
Go to your project directory and run SBT. The following has the recommended VM options for running on Windows. Replace
XXX
with your SBT installation location.$ java -Xmx512M -jar XXX/sbt-launch-0.12.1.jar [info] Set current project to Akka Hello World (...)
-
Run the program!
> run [info] Running HelloWorld Hello world [success] Total time: 6 s, completed 11/11/2012 11:02:21 AM
See also:
- Akka's basic actor documentation.
- The example program in the Akka template project.
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