Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Fri, 17 Jun 2005 18:32:41 -0600

> This is really important. We must see how to implement the data store 
> for a CA gateway.

Important for the gateway, yes, but for the IOC's database we naturally
expect a different, more efficient, implementation of the data structures
because, unlike the gateway, the structure of the data is nearly 100%
determined when the code compiles.

Jeff 

> -----Original Message-----
> From: Marty Kraimer [mailto:[email protected]]
> Sent: Friday, June 17, 2005 9:49 AM
> To: EPICS Core Talk
> Subject: Re: Fundamental Types / Gateway
> 
> 
> 
> Ralph Lange wrote:
> 
> >
> > What I really like to have (if I had a free wish...) for the Gateway
> > is a completely opaque black-boxed data store.
> >
> >
> 
> A wish is not an implementation and actually not even an interface :-)
> 
> This is really important. We must see how to implement the data store
> for a CA gateway.
> 
> If someone can create code to describe, store, and transport all data
> we have discussed so far via just the Data Access definitions then
> please tell us how to do it.
> 
> Let me just make a wild proposal that involves allowing only well
> defined types.
> 
> GIVEN
> 
> The types
> 
> primitive
>      bool,
>      octet,
>      int16,
>      ...
>      float64
> string
> array
> struct   - can contain fields of any type including itself
> 
> 
> And via these types define a way to introspect.
> 
> 
> THEN
> 
> 
> Then I claim that we can create code to describe, store, and transport
> all data  we have discussed so far.
> 
> It would mean that anything interfacing to CA must use only this set of
> types for data.
> 
> 
> Marty
> 
> 
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System