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RE: Event-based actions



fixed

Ha! Thanks, Joe. Pretty slick. I hadn't thought to do this with multiple
formats.

Still feels like using a hammer to drive screws into the wall, though.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
Reality is for those who can't face Science Fiction.


Dennis, here's the IBM book on the issue. Not terribly helpful but it
gives you the basic idea.

http://publib.boulder.ibm.com/infocenter/iadthelp/v7r0/index.jsp?topic=
/com.ibm.etools.iseries.langref2.doc/dspfdq.html

The idea is that if the entry on the data queue is *DSPF, then READ the
display file, otherwise do whatever the entry says (which in this
business case would be to upadte the data and WRITE the display file).

Joe

Great to hear it's possible, Jack. Care to elaborate on _how_ one
would post updates to the 5250 screen (barring status messages, which
are too limited to satisfy the need) without flicker, flash, or
disruption to user input? That is a challenge for which I have never
seen a solution with the
(naturally-blocking) 5250 display.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"Never lend books, for no one ever returns them. The only books I
have in my library are those that other folks have lent me."
-- Anatole France


Not only possible with RPG and 5250- it's been possible since IBM
enabled display files to post status changes to data queues. FWIW, I
believe that feature was introduced on the System 38 from the
research I did supporting an such an application 12 years ago. Said
app was at least 10 years old at that time.

Was an undocumented maintenance nightmare until I used object
auditing to trace through the event chains, but I came to appreciate
it as one of the most elegant designs I've seen implemented on the
platform.


... for this kind of application, you would need 2 parts:
- a runtime supporting registration of listeners (windows, xwindows
or
something comparable as Javascript based for a browser interface)
- a programming language supporting Multithreading (remark: rpg
with
5250
is not possible)
most of this is done with Java, C# and C++

D*B
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