Re: Fwd: [Smartfrog-support] sfStart() timeout

On 11/28/06, Steve Loughran <[email protected]> wrote:
> Olivier Pernet wrote:
>
> >
> > While I was at CERN this summer, we ran into the same problem when
> > deploying Xen virtual machines.
> > What I did was a bit different : I started a thread pinging the new
> > virtual machine every N seconds, reporting to a set of Observers when
> > the VM was brought up, or died.
> > http://smartdomains.svn.sourceforge.net/viewvc/smartdomains/trunk/src/ch/cern/openlab/smartdomains/DomainMonitoringThread.java?revision=71&view=markup
> >
> > Then, in the XenDomainManager component (the SmartFrog component), the
> > sfStart() method waits to be notified of the VM creation :
> > http://smartdomains.svn.sourceforge.net/viewvc/smartdomains/trunk/src/ch/cern/openlab/smartdomains/XenDomainManager.java?revision=84&view=markup
> >
> > All in all it's pretty simple.
> >
> > Cheers
> >
>
> ok, so if we were to have a Condition interface, you'd have a new
> XenNodeUp condition that could be tested and integrated with workflow?
>
> I like the idea of having a component that could observe one or more
> conditions and get notified when any of them changed state. It would be
> a workflow component that would use the condition as a trigger
>
>
> something extends Trigger {
>     condition extends XenNodeUp { hosts [ .. ]; }
>
>     action extends Sequence { ... }
>
>
> }

Sound good, we could certainly do that. I'm not sure I will, though -
I'm only doing SmartDomains on my spare time those days, but it would
probably be done anyway.

-- 
Olivier Pernet

We are the knights who say
echo '16i[q]sa[ln0=aln100%Pln100/snlbx]sbA0D4D465452snlbxq'|dc

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