Get command line arguments when running an Akka Microkernel?

Question

I have the Akka microkernel below:

class ServiceKernel extends Bootable {

  val system = ActorSystem("service-kernel")

  def startup = {
    system.actorOf(Props(new Boot(false))) ! Start
  }

  def shutdown = {
    system.shutdown()
  }
}

Because the kernel extends Bootable and not App, how would I access command line arguments used when starting the kernel? For instance if I run the kernel using start namespace.ServiceKernel -d rundevmode or similar. Thanks!

Additional Info

I thought it would be worth adding this information about the start up script in the microkernel. In /bin/start you notice the following:

#!/bin/sh

AKKA_HOME="$(cd "$(cd "$(dirname "$0")"; pwd -P)"/..; pwd)"
AKKA_CLASSPATH="$AKKA_HOME/config:$AKKA_HOME/lib/*"
JAVA_OPTS="-Xms256M -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=2"

java $JAVA_OPTS -cp "$AKKA_CLASSPATH" -Dakka.home="$AKKA_HOME" akka.kernel.Main "$@"

Although om-nom-nom originally suggested -D options, it looks like it's in use and the main start up parameter is being passed to the akka.kernel.Main class (which in this case would be the ServiceKernel class above).

Answer 1

Here is the minimal example:

object Foo extends App {
    val debugModeOn = System.getProperty("debugmode") != null
    val msg = if (debugModeOn) "in debug mode" else "not in debug mode"
    println(msg)
}

» scala Foo -Ddebugmode
in debug mode
» scala Foo            
not in debug mode

You can do extra check to overcome this issue:

» scala Foo -Ddebugmode=false
in debug mode

P.S. you might also want to use Properties helper, that contains bunch of methods like propOrNone, propOrElse, etc