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From: Jason Dillon <jason@planet57.com>
Subject: Re: When has the server started?
Date: Sun, 3 Sep 2006 16:53:24 -0700
To: dev@geronimo.apache.org
Sender: Jason Dillon <jason.dillon@gmail.com>

Okay, I was able to get something working... though I had to use  
classes from geronimo-kernel... not sure how to perform the same  
operations with just JMX interfaces.

If anyone knows, please speak up... it would be nice to not need to  
use kernel classes to check a few boolean attributes on remote beans.

I still think we might want to expose fullyStarted on the kernel  
directly, and configure it so that its exposed as a MBean attribute,  
so that AbstractName and AbstractNameQuery are not needed.

  * * *

Anyways, what I have now works well... and now geronimo:start can  
tell when the minimal servers are started :-)

Thanks for the hint about PersistentConfigurationList.

--jason


On Sep 3, 2006, at 6:00 AM, Aaron Mulder wrote:

> I think if you get the AbstractName for the LocalAttributeManager in a
> test program, there's a method on the AbstractName to get or generate
> an ObjectName, and then you could use that ObjectName to access the
> LocalAttributeManager (and therefore the kernelFullyStarted attribute)
> via JMX.  I'm not sure that will work, but it's where I would start.
> If that doesn't work, you could try invoking the
> getAttribute(abstractName, attributeName) operation on the Kernel via
> JMX (so you'd access the Kernel via JMX, but call an operation on it
> to access the LocalAttributeManager).
>
> FWIW, I think Daemon just loops over a Set to be fully generic -- I'm
> pretty sure that in practice, the LocalAttributeManager is the one and
> only PersistentConfigurationList in the server.
>
> Thanks,
>     Aaron
>
> On 9/3/06, Jason Dillon <jason@planet57.com> wrote:
>> Any idea how to actually do that?
>>
>> --jason
>>
>>
>> On Sep 3, 2006, at 5:34 AM, Aaron Mulder wrote:
>>
>> > I think kernelFullyStarted is a GBean attribute on only certain  
>> types
>> > of GBeans -- I believe PersistentConfigurationList GBeans.  It's  
>> set
>> > by Daemon.java when the startup process is complete, so it's not a
>> > kernel-level feature, but should still work for all practical
>> > purposes.  I would think you'd be able to get the property from the
>> > LocalAttributeManager via JMX.
>> >
>> > Thanks,
>> >     Aaron
>> >
>> > On 9/1/06, Jason Dillon <jason@planet57.com> wrote:
>> >> What is the best way to detect when the server has started  
>> using JMX?
>> >>
>> >> The ServerBehavior class in the deployment plugin has some code  
>> that
>> >> connects to JMX, then lists the configurations, and then takes he
>> >> first configuration and get the "kernelFulltStarted" attribute  
>> from
>> >> it... but it assumes that  
>> ConfigurationManager.listConfigurations()
>> >> returns an array of ObjectNames, which it does not.
>> >>
>> >> I also peeked at the server's JMX tree via jconsole and I don't  
>> see
>> >> any attribute or operation that matches up to  
>> "kernelFullyStarted".
>> >> There is also a strange "null" element of the tree, but I will  
>> leave
>> >> that for another day.
>> >>
>> >> So, how can I easily check of the server has started by polling  
>> a JMX
>> >> attribute?
>> >>
>> >> --jason
>> >>
>>
>>