Re: CA Put Logging

[Matthias Clausen <Matthias.Clausen@desy.de>]

Ernest Williams wrote:
> Hi,
>
> Has CA Put Logging been integrated into EPICS R3.14.x?
the hook for CA-Put-Logging are available in base for quite some time. 
The hook for alarm-logging has been added recently.
> Is it integrated into iocLog facility?
The hooks are only the mandatory part of this story.
The real workhorse is behind the hooks. (and not part of base)
So the answer is -no- it's not integrated into iocLog.

Behind the alarm-hook is the alarmLogging task which is now in operation 
at DESY for about a year.
Behind the CA-PutLog hook is the task which Slava Korobov wrote about a 
decade ago.
As soon as there's time to work on this part we (Bernd) will have a look 
at the code for put-logging and use the same method as for alarmLogging 
to forward(push) the putLog messages to the interconnectionServer which 
finally writes messages into JMS. Besides the fact that we want to send 
all of the messages: alarms, putLog AND system messages into JMS there's 
another good reason to work on the putLogmessage task. Namely logging 
changes when one - or even worse - two or more operators are tuning a 
record using the slider. The actual implementation only covers the case 
where lots of changes are applied to the same PV(as a result only one 
message will be generated when the slider movement finished - here: 
another PV is accessed, or after a tineout). We want to improve this 
part of the code. The ring buffer which is already in place for 
alarmLogging can help us (probably a second instance of it) to keep 
track of bulk changes on several records in parallel.

If there's interest to work together on this part - let us know.

System logging shall finally also use the JMS message facility. The 
advantage being that all messages will be stored in one place. All the 
tools to display and analyze messages can be the same and last and most 
importantly we can also use the support for redundant connections which 
is built into the communication between IOC and interconnectionServer.

(btw: there's also a C++ program in operation to replace cmlogMsg and 
write directly to JMS - on workstations)

-Matthias