Experimental Physics and Industrial Control System
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Hello all,
I´m a newbie in this environment and I´m trying to understand EPICSv4,
I have tried examples HelloWorld and rdbService from example JAVA in the
last release from EPICSv4-JAVA. Now I´m trying to make a classical
example of a PVServer generating data and clients trying to get it
automatically, so I have a pair of questions that maybe you can help me
to solve.
First: I think that I should try using Monitor to publish/suscribe for
automatic onChange working between a PVServer and a Client, AM I right?
Second: The General architecture for monitor seems a bit complex to me
and I need some help to Undestand it. Here are my thoughts and I want to
Know if I´m right or where I´m mistaken:
First you start the client with ClientFactory.start(). In the client
side you need to get to a ChannelProvider (in this case "pva"). Then you
have to create a Channel from the Provider (but you need a
ChannelRequester and I don´t know if I just have to create the object or
find it in the net).
Continuining with the creation of a PVStructure you can then create also
the Monitor (But I don´t know if when I create the channel, this channel
has to be a ChannelRPC or not). Also, Is the requester of the monitor
the same as the requester of the Channel creation?. Finally I don´t see
the structure of the MonitorElement, and when I create the Monitor, do I
have to make a while loop where I write the commando FOR for the monitor
and get there the MonitorElement?
In the server side I´m even more lost, as I have seen the createMonitor
in ChannelRPC, but I can´t see any of the parameters configuration
(such as the term onChange) that it´s mentioned in the documentation
about Monitor.
If anyone has tested this, I would gladly accept any help.
Thanks in advance, Ricardo
--
Doctorando i2a2
Jefe de Servicio de Instalaciones - CEDEX
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ANJ, 16 Dec 2015 |
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