Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Fri, 11 May 2007 11:38:39 -0400

David Dudley wrote:

I've actually worked through all the problems I was having getting JCA
setup, and now as an application, it seems to be operating correctly.
I'm also using the CAJ library with this, so there is no native code in
the thing, and I can run it on any machine I copy the application on to
(major plus!).
All is fine and good to be able to use this, -except-, in the case of
distributing an application, or as an applet, there is no way to provide
a location of where to get the 'JCALibrary.properties' file.  Can the
capability of providing a location (preferably being able to use a URL
Link as well) be added to 'getInstance' (or should I do it?)?

I second this request. It would be great to be able to load the
JCALibrary.properties file from a JAR file rather than referring to the
file system.
Maybe even better would be to modify the algorithm used to find the
JCALibrary.properties file so that in addition to looking where it looks
in the file system, it will also look on the classpath via the class
loader (e.g. Class#getResource or Class#getResourceAsStream). This is
similar to how log4j <http://logging.apache.org/log4j/> finds its
properties file.
My workaround is to package my own custom JCALibrary.properties file in
my application JAR file, load it via Class#getResourceAsStream, create a
JCA DefaultConfiguration, set its properties from the properties loaded
from my custom JCALibrary.properties file, and then create the context
with it.
-lewis
Also, is there a way to create a channel and then 'add' a connection
Listener as a separate function?  Or a way to close a channel?
Since this package is supported by cosylab, though I'd suggest it
first, and see what kind of response.
David

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System