Tim Freeman wrote:
Thanks for the information Mike,
I supposed it was getting destroyed, hmm. I'm making the controller
part of a grid service and the VM's are distinguished by an assigned
distinguished name which maps to a local name (so that ID #s can
change). The controller is only dealing in local names now. It looks
like one of the domain events is restart:
The domain exits with code reboot:
(event xend.domain.exit (gridvm1 3 reboot))
This is the restart being scheduled:
(event xend.domain.restart (gridvm1 3 schedule))
Now the domain gets destroyed and goes away:
(event xend.domain.destroy (gridvm1 3))
(event xend.domain.died (gridvm1 3))
Now the domain has gone we can restart it:
(event xend.domain.restart (gridvm1 3 begin))
Between the died event and the create event gridvm1 will
not appear in 'xm list'.
(event xend.domain.create (gridvm1 3))
The create succeeded so we get a restart success:
(event xend.domain.restart (gridvm1 3 success))
The domain starts to run:
(event xend.domain.unpause (gridvm1 3))
..where "gridvm1" is the local name. So I don't think a domain object
is necessary, couldn't I poll 8001 for any changes concerning the local
name (as long as nothing at a higher level started a domain with the
same name in that window)?. That's pretty cool, I didn't know you could
receive the events, I thought you could only 'ask.'
That makes me think I should write a polling thread that any class could
register callbacks with? My thinking is that the 'right way' is to
decouple any higher level functionality. Unless I'm missing a
programming trick here..
What I do in java is use a thread to read the events out of of the socket
and post them to a class handling the usual 'listener' pattern
so that things can register callbacks. Pretty much as you suggest.
In python you could use asyncore or twisted to avoid threads/blocking.
Hope this helps,
Mike
On Tue, 5 Oct 2004 14:25:58 +0100
Tom Wilkie <tw275@xxxxxxxxx> wrote:
From python you can use XendClient to call the api directly - either
synchronously or asynchronously. From Java you can use Jakarta commons
httpclient, and from C you can use libcurl (see the xfrd source in
xen).
I wrote a simple interface to xend in java for the high-xeno stuff.
Let me know if you need it, I don't think that repository is public.
Thanks, I would definitely like to take a look. I started an http
interface, but I do need to think about all of this some more (if I
combined or made improvements I'd make that available to anyone also).
Thanks to you both for you help!
Tim
Cheers
Tom
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