[Biocorba-l] BSANE and bioCORBA

[Ewan Birney]

On Thu, 31 May 2001, Philip Lijnzaad wrote:

> On Thu, 31 May 2001 12:59:03 +0100 (BST), 
> "Ewan" == Ewan Birney <birney@ebi.ac.uk> wrote:
> 
> Ewan>    I need to revisit CosPropertyService and CosLifeCycle - if I remember
> Ewan> right they make life a pain in the arse for implementors - 
> 
> CosProperty should be OK; CosLifeCycle is evil. It was just added because it
> provides a remove() The others, move() and copy(), are completely
> unimplementable, even the OMG agrees on that (in BSA, it's intended that
> copy() and move() raise the NO_IMPLEMENT exception). So I would say drop
> LifeCycle, and cut-n-paste remove()
> 
> Note: the semantics of remove() are that it destroys the CORBA object; after
> this, noone who happens to have a reference to that same object, can do
> anything with it anymore. 
> 
> Ewan> I prefer the GNOME reference counting system and just a short a simple
> Ewan> key - list-value system as in BioCorba. 
> 
> I think I agree, but I also think Bonobo confuses the CORBA Object management
> with the implementation object management, whereas they are (or can be)
> largely orthogonal. Firstly, it relies on clients always calling ref() when
> wanting to pass their object reference around; secondly, clients allways have
> to call deref() when done with an object. Neither can be guaranteed,
> especially with crashing clients and backhoes roaming the surface of the
> earth.
> 


For sure but it works, even across distances. Agreed you *have* to restart
servers at some point, but for well behaved clients the server gets a big
win.

 I like the GNOME ref() unref model - it has been used now for >10 years
first in DOM and now Bonbo object frameworks v.well



> The only scalable way to keep the resources under control is to periodically
> restart the server (requires persistent iors), or to use an evictor queue, and
> killing things that are drop off the queue and/or are too old. 
> 
> But this is probably nothing new. Cheers,
> 
>                                                                       Philip
> -- 
> If you have a procedure with 10 parameters, you probably missed some. (Kraulis)
> -----------------------------------------------------------------------------
> Philip Lijnzaad, lijnzaad@ebi.ac.uk \ European Bioinformatics Institute,rm A2-08
> +44 (0)1223 49 4639                 / Wellcome Trust Genome Campus, Hinxton
> +44 (0)1223 49 4468 (fax)           \ Cambridgeshire CB10 1SD,  GREAT BRITAIN
> PGP fingerprint: E1 03 BF 80 94 61 B6 FC  50 3D 1F 64 40 75 FB 53
> 

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Ewan Birney. Mobile: +44 (0)7970 151230, Work: +44 1223 494420
<birney@ebi.ac.uk>. 
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