Re: HOD/HACL running on z/OS?
- From: "McKown, John" <john.mckown@xxxxxxxxxxxxxx>
- Date: Thu, 22 Sep 2005 10:52:52 -0500
> -----Original Message-----
> From: IBM Mainframe Discussion List
> [mailto:IBM-MAIN@xxxxxxxxxxx] On Behalf Of Farley, Peter x23353
> Sent: Thursday, September 22, 2005 9:08 AM
> To: IBM-MAIN@xxxxxxxxxxx
> Subject: Re: HOD/HACL running on z/OS?
>
>
> Thanks, I will look at that. However, I'm not really looking
> for something
> tied to a webserver, if it can be avoided. All I need is the
> ability to
> programmatically act as a 3270 terminal and record the
> outputs that I get
> from the applications that I run. And no, I don't really
> want to write VTAM
> LU code either. BTDT, much more complicated than my minimalist needs.
>
> Peter
If I understand correctly, what you basically want is the ability to
capture 3270 screens for later comparison. You would like to do this
capture on the z/OS system if at all possible. And the solution needs to
be zero, or at least very low, cost. (Do I ever understand that last
one!). From other posts, I would guess that you'd also like to capture
all the 3270 inputs. The eventual goal is to be able to capture 3270
inputs and outputs so that the inputs could be replayed later and the
new outputs compared against the old outputs. (regression testing of
code changes?).
The following is just "off the top of my head" (like my hair <grin>).
You mentioned that you don't want to write a VTAM "capture" type routine
due to its complexity. How about a TCP/IP "capture" type routine? I
think you'd write something like a "transparent proxy". What your
routine would do is LISTEN on a particular IP port. The end-user would
connect to this port. Upon connection, your routine would attempt to
connect to the normal TN3270E port. Your routine would simple "route"
(or "copy") the IP packets between the TN3270E server on the mainframe
and the TN3270E client on the other end. You shouldn't need to actually
inspect or change them. As it was routing the packets, it could record
them to a file on the mainframe (with an indicator as to which direction
the packet was flowing). When you wanted to "replay" a session, you
would write another program to connect to the TN3270E port on the
mainframe, read the previously recorded file, and send that information
to the TN3270E server. You could then compare the response from the
application to the response recorded in the file. The main problem that
I can see is that there are many possible TN3270E sequences which would
result in the same 3270 screen display. So I guess the "comparison"
would require actually creating a 3270 "buffer" from the file contents
and the response, then compare the buffers. This instead of directly
comparing the TN3270E data streams, byte for byte. There is still a
matter of error recovery or propagation if either socket is abnormally
terminated. But I think this is easier to program than the LU error
recovery / propagation.
I suggest this simply because, to me, this TCPIP program would be easier
to code than the equivalent VTAM program.
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