[akka-user] Akka shutdown

[Shimi]

Is there a way to shutdown Akka gracefully?

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[Viktor Klang]

Hi Shimi,

If you're running akka in microkernel mode: se.scalablesolutions.akka.kernel.Kernel.shutdown

If you're running it in an app-server you just need to undeploy the app.


Does that help?


Cheers,

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Viktor Klang
| "A complex system that works is invariably
| found to have evolved from a simple system
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Akka - the Actor Kernel: Akkasource.org
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[Shimi]

microkernel mode.

> se.scalablesolutions.akka.kernel.Kernel.shutdown
Are you sure? there is no shutdown in
se.scalablesolutions.akka.kernel.Kernel

Exception in thread "main" java.lang.NoClassDefFoundError: se/
scalablesolutions/akka/kernel/Kernel/shutdown
Caused by: java.lang.ClassNotFoundException:
se.scalablesolutions.akka.kernel.Kernel.shutdown
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
Could not find the main class:
se.scalablesolutions.akka.kernel.Kernel.shutdown. Program will exit.

Am I missing something here?

On Apr 27, 2:59 pm, Viktor Klang <viktor.kl...@gmail.com> wrote:
> Hi Shimi,
>
> If you're running akka in microkernel mode:
> se.scalablesolutions.akka.kernel.Kernel.shutdown
>
> If you're running it in an app-server you just need to undeploy the app.
>
> Does that help?
>
> Cheers,
>

> On Tue, Apr 27, 2010 at 1:54 PM, Shimi <shim...@gmail.com> wrote:
> > Is there a way to shutdown Akka gracefully?
>
> > --
> > You received this message because you are subscribed to the Google Groups
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[Viktor Klang]

Kernel extends AkkaLoader, AkkaLoader has a shutdown method.
Which version of Akka are you running?

object Kernel extends AkkaLoader {

class AkkaLoader extends Logging {

Cheers,

[Shimi]

version 0.8.1 and yes AkkaLoader has a shutdown method but how can I
call it from command line without Main

On Apr 27, 3:46 pm, Viktor Klang <viktor.kl...@gmail.com> wrote:
> Kernel extends AkkaLoader, AkkaLoader has a shutdown method.
> Which version of Akka are you running?
>
> object Kernel extends AkkaLoader

> {<http://github.com/jboner/akka/blob/master/akka-kernel/src/main/scala/...>
>
> class AkkaLoader extends Logging
> {<http://github.com/jboner/akka/blob/master/akka-servlet/src/main/scala...>

[Viktor Klang]

On Tue, Apr 27, 2010 at 2:53 PM, Shimi <shi...@gmail.com> wrote:

version 0.8.1 and yes AkkaLoader has a shutdown method but how can I
call it from command line without Main

If you look at Kernel you can see that Main is just a wrapper around Kernel.boot
if you can't call it from your console, I'd suggest you don't have akka-kernel on your classpath.
 

[Shimi]

I can see that Main is just a wrapper around Kernel.boot which calls
AkkaLoader.boot
It might be a silly question but I have no idea how can I call
shutdown from command line.


On Apr 27, 3:57 pm, Viktor Klang <viktor.kl...@gmail.com> wrote:

> On Tue, Apr 27, 2010 at 2:53 PM, Shimi <shim...@gmail.com> wrote:
> > version 0.8.1 and yes AkkaLoader has a shutdown method but how can I
> > call it from command line without Main
>

> If you look at Kernel<http://github.com/jboner/akka/blob/master/akka-kernel/src/main/scala/...>you

[Viktor Klang]

On Tue, Apr 27, 2010 at 3:12 PM, Shimi <shi...@gmail.com> wrote:

I can see that Main is just a wrapper around Kernel.boot which calls
AkkaLoader.boot
It might be a silly question but I have no idea how can I call
shutdown from command line.

Ah, you're talking about from a terminal, I wrongly assumed you meant from an sbt console / a REPL

Akka is built around the principle "Let it crash", so I'd say kill it!
 

[Shimi]

right. So far I have been killing it.
still, it would have been nice to shut it down properly using init.d
script


On Apr 27, 4:54 pm, Viktor Klang <viktor.kl...@gmail.com> wrote:

> On Tue, Apr 27, 2010 at 3:12 PM, Shimi <shim...@gmail.com> wrote:
> > I can see that Main is just a wrapper around Kernel.boot which calls
> > AkkaLoader.boot
> > It might be a silly question but I have no idea how can I call
> > shutdown from command line.
>
> Ah, you're talking about from a terminal, I wrongly assumed you meant from
> an sbt console / a REPL
>

> Akka is built around the principle "Let it crash", so I'd say *kill* it!

[Viktor Klang]

On Tue, Apr 27, 2010 at 4:07 PM, Shimi <shi...@gmail.com> wrote:

right. So far I have been killing it.
still, it would have been nice to shut it down properly using init.d
script

Pretend you're shutting it down gracefully ;-)
 

[Shawn]

I've noticed that if I kill my akka microkernel it spits out some nice messages about shutting down the actor system. So I'm thinking that's at least a little bit graceful?

More importantly, if I kill an akka microkernel process does it give actors a chance to finish processing their current message? How about messages pending in their inboxes?

[Akka Team]

Hi Shawn,

akka.kernel.Main registers an JVM shutdown hook, which is executed on a best effort basis (e.g. it is not executed when sending SIGKILL or upon VM errors). You control what this does by overriding the Bootable.shutdown() method. If you do ActorSystem.shutdown() within that then that will context.stop() all actors, meaning that after the current message is processed they will terminate, messages left in the mailbox will go to deadLetters (best effort, again).

Regards,

Roland

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