Experimental Physics and
Industrial Control System

Matej Sekoranja <[email protected]> · Wed, 6 Jan 2010 11:58:54 +0100

Hi, all!

2 issues, 2 answers...

1) CAJ and JCA do not read environment variables

When CAJ was written reading env. variables was obsolete in Java (1.4). Now is back.
I got a request from SLAC to implement reading env. variables for CAJ and also for JCA.
It can be enabled with a special switch (for backward compatibility). Default is not to use env. variables.
If you all agree, I can change the default.

2) CAJ is broadcasting to 255.255.255.255.

Prior Java 1.6 it was not possible to introspect all network interfaces. So I was forced to use 255.255.255.255 as auto address.
Still I want CAJ to run on older Java version than 1.6. (Anyway, what do you use?)
What to do (options)?
1) detect java version and if 1.6 use introspection to get broadcast address of each network interfaces (might not be best solution since behavior is not the same)
2) I got one proposal from APS to use special env. variable that determines netmask; this would allow me to change 255.255.255.255 to e.g. 192.168.0.255 (but still only one network IF!)
3) ... any suggestion from you :)

I guess I should go 1) and for older versions non-auto address list should be used.

Cheers,
Matej

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System