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<== Date ==> <== Thread ==>

Subject: RE: PVManager ReadOnly Check
From: "Kasemir, Kay" <[email protected]>
To: "'Carcassi, Gabriele'" <[email protected]>, "[email protected]" <[email protected]>, "[email protected]" <[email protected]>
Date: Thu, 20 Oct 2011 15:22:00 -0400
Hi:

> Something like PV.isWriteAllowed() from org . csstudio . utility . pv would be
> nice.
I would go even further:
Something like o.c.utility.pv would be nice, period.

The PV manager is great for applications that need to read the average over the last 10 seconds
from N channels, updating at 1 Hz on thread X, expecting a list of Double, while filtering on
only data where ... is ... .
That's really great.
But of course you can't "write" to those PVs because how would you change the average
over the last 10 seconds? Go back 8 seconds and adjust that original value?

The good news is that the PVManager internally uses a 'DataSource' API that is similar
to utility.pv: It's the raw channel; pluggable implementations for EPICS V3, simulated channels,
then EPICS V4, or whatever you want to add in the future.

If we allow access to both
a) the DataSource API for those who need/want/prefer a raw channel API to read and write
b) a PVManager API that can average, queue, schedule update rates, handle thread access
.. I think we'd have it all.

Thanks,
Kay


Replies:
RE: PVManager ReadOnly Check Carcassi, Gabriele
RE: PVManager ReadOnly Check Dalesio, Leo
References:
PVManager ReadOnly Check marcus . michalsky
RE: PVManager ReadOnly Check Carcassi, Gabriele

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