Experimental Physics and Industrial Control System
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Hi,
At SNS we use JCA/JNI for production and use JCA/CAJ for testing
through the gateway outside the controls network. JCA/CAJ is more
convenient for external use since it doesn't require the EPICS
libraries and JNI plugin to be present on the client machine. However,
we encountered serious issues with earlier versions of CAJ, so it
isn't accepted for use inside of our controls network. In particular,
there was an issue with IOC crashes being correlated with CAJ clients.
That may have since been fixed. Another issue which may have also been
fixed is that channels would sometimes fail to reconnect
automatically. We also encountered connection issues when attempting
to connect thousands of channels using CAJ.
Basically, JCA/JNI tends to be more acceptable for production since it
uses the native CA libraries that are supported in the EPICS
community. JCA/CAJ is a very good, convenient, pure Java attempt at
implementing the same CA client protocol, but since it isn't the
"official" CA implementation it isn't as well accepted. More testing
will be needed to provide confidence in JCA/CAJ for use inside the
controls network.
best regards,
tom
On Mar 24, 2009, at 12:19 PM, GaryCarr wrote:
Here at LANL/AOT-IC we are just starting to replace JCA1 with JCA2
in our Java applications. Since moving between JCA2 and CAJ is just
a one line code change, I have run my applications with both, and
don't see any real differences between the two. A couple of questions.
How many people are using JCA2?
how many people are using CAJ?
Is there any reason to choose one over the other?
- References:
- JCA2 vs CAJ? GaryCarr
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ANJ, 31 Jan 2014 |
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