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Swing Actors using Akka
// ©2012 Viktor Klang
package akka.klang
import akka.dispatch.{ DispatcherPrerequisites, ExecutorServiceFactory, ExecutorServiceConfigurator }
import com.typesafe.config.Config
import java.util.concurrent.{ ExecutorService, AbstractExecutorService, ThreadFactory, TimeUnit }
import java.util.Collections
import javax.swing.SwingUtilities
// First we wrap invokeLater as an ExecutorService
object SwingExecutorService extends AbstractExecutorService {
def execute(command: Runnable) = SwingUtilities.invokeLater(command)
def shutdown(): Unit = ()
def shutdownNow() = Collections.emptyList[Runnable]
def isShutdown = false
def isTerminated = false
def awaitTermination(l: Long, timeUnit: TimeUnit) = true
}
// Then we create an ExecutorServiceConfigurator so that Akka can use our SwingExecutorService for the dispatchers
class SwingEventThreadExecutorServiceConfigurator(config: Config, prerequisites: DispatcherPrerequisites) extends ExecutorServiceConfigurator(config, prerequisites) {
private val f = new ExecutorServiceFactory { def createExecutorService: ExecutorService = SwingExecutorService }
def createExecutorServiceFactory(id: String, threadFactory: ThreadFactory): ExecutorServiceFactory = f
}
// Then we simply need to create a dispatcher configuration in our application.conf
swing-dispatcher {
type = "Dispatcher"
executor = "akka.klang.SwingEventThreadExecutorServiceConfigurator"
throughput = 1
}
// After that we just create the GUI Actors with a Props with the correct dispatcher set:
val frameActor = context.actorOf(Props[FrameActor].withDispatcher("swing-dispatcher"), "frame-actor")
// Done! Now all messages processed by "frameActor" will be executed by the Swing Event Dispatch Thread, enjoy!
@mucaho
mucaho commented Feb 13, 2014

Thank you. I have extended this gist to include JavaFX actors as suggested by this stackoverflow answer. It can be found here.

@drozzy
drozzy commented Apr 15, 2014

Could you explain where the g.draw() calls go? Does the frameActor gets created inside another actor? Thanks.

@viktorklang
Owner

@drozzy you can call draw inside the FrameActor, and if you want to initiate a repaint from the outside, send the FrameActor a message to do so.

@Maatary
Maatary commented Aug 10, 2014

Could you explain a bit better what you are doing here? The goal is to have an actor that can execute itself from within the UI Thread, To what be able to manipulate the UI, without using Platform.RunLater?

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