[MOBY-dev] lease versus agent for registry updating

[Boris Steipe]

Why not put the burden of the lease on the agent to combine the 
advantages of both models? I.e. if service is down for less then a 
specific time, it might not get deregistered but only flagged as 
temporarily unavailable ... then un-flagged as it comes up again, 
except if it's down for, say > 1week, then it gets deregistered.

$0.02

Boris

On Friday, Aug 12, 2005, at 16:38 Canada/Atlantic, Mark Wilkinson wrote:

> Hi all!
>
> Eddie and I are spending the day working on MOBY Central architecture
> issues.  We've run into a question that has so many pros and cons that
> we decided to toss it out to the list for other opinions.
>
> Keeping MOBY Central up-to-date:
>
> Method 1:  Agent
>
> An agent retrieves the list of SignatureURL's from the registry, and
> crawls around retrieving the RDF from each of those URLs.  The RDF is
> compared to what is in the registry, and updates/deletions are made.
>
> Consequence to service provider: a service providers machine goes down,
> the service is deregistered (the agent can't retrieve the URL) and the
> service provider must then actively re-register their services
>
>
> Method 2:  Lease
>
> Services have a time-stamp in the registry and expire after X time.
> They must then be actively re-registered.
>
> Consequence to service provider:  Service providers must set up a cron
> (or whatever) that is aware of all of their *current* Signature URL's
> and can call MOBY Central to re-register their services on a regular
> basis.
>
>
> Both solutions seem to put an unwanted burden on the service providers,
> but the burdens are different in nature and frequency.
>
> Which of these seems preferable?  Are there solutions we haven't 
> thought
> of?
>
> ???
>
> Mark & Eddie
>
>
> -- 
> "Ontologists do it with the edges!"
>
> Mark Wilkinson
> Asst. Professor
> Dept. of Medical Genetics
> University of British Columbia
> PI in Bioinformatics
> iCAPTURE Centre
> St. Paul's Hospital
> Rm. 166, 1081 Burrard St.
> Vancouver, BC, V6Z 1Y6
> tel: 604 682 2344 x62129
> fax: 604 806 9274
>
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