I do not like the /simultaneous/temperature interface.
As a general rule, owserver operations are synchronous: if you read
say /uncached/10.AE9C54020800/temperature, you get a reply when the
requested data is available.
On the contrary a write to /simultaneous/temperature is asynchronous,
since it will return *before* data is available.
IMHO for consistency also a write to /simultaneous/temperature should
*block* until all conversions are performed. I.e. ‘simultaneous’ ops
should be synchronous: by doing so there is no need for the 'sleep 1’
before the owread commands.
Moreover what happens if process A writes to /simultaneous/temperature
and process B reads from /uncached/10.AE9C54020800/temperature before
the 1.0s for the conversion are over? Will this result in a race
condition? Maybe all operations involving temperature should be
blocked during the simultaneous conversion.
Finally we have different temperature resolutions.
/structure/22/temperature 't,000000,000001,ro,000012,v,'
/structure/22/temperature10 't,000000,000001,ro,000012,v,'
/structure/22/temperature11 't,000000,000001,ro,000012,v,'
/structure/22/temperature12 't,000000,000001,ro,000012,v,'
/structure/22/temperature9 't,000000,000001,ro,000012,v,'
which one will be returned by latesttemp? Wouldn’t it be better to have
/structure/22/last/temperature 't,000000,000001,ro,000012,v,'
/structure/22/last/temperature10't,000000,000001,ro,000012,v,'
/structure/22/last/temperature11't,000000,000001,ro,000012,v,'
/structure/22/last/temperature12't,000000,000001,ro,000012,v,'
/structure/22/last/temperature9 't,000000,000001,ro,000012,v,'
instead of a catchall /structure/22/latesttemp ?
Even if the simultaneous conversion is valid for only a single
resolution, I would still prefer a single /22/last/temperatureXX
instead of a /22/latesttemp node.
S.
On 02 Feb 2016, at 01:18, Jan Kandziora <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I just committed the "latesttemp" node we have been talking about
recently. It's function: provide a way to read the temperature value
from scratchpad *without triggering a conversion*.
This is especially useful in conjunction with simultaneous conversions.
$ owwrite /simutaneous/temperature 1
$ sleep 1
$ owread /uncached/10.AE9C54020800/latesttemp
19.6875
$ owread /uncached/10.9EFD53020A00/latesttemp
21.5
...
Please pull from the git archive and test.
Kind regards
Jan
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