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Start by taking all the files except the screen and putting them into a callable program. Not to difficult to do and does not require ILE. You will be calling this program passing the fields from the screen I/O. I like to pass external data structure of the main file that is being maintained. I also pass control fields, status fields and work variables. A great way of testing to make sure that every variable you need to retain between calls is being passed back and forth is to set on LR in the edit/update program. This will ensure that the module will work correctly latter when attached to a server program. Once you have the Screen I/O in a separate module calling the edit/update program(s), you can now introduce the ILE environment, although not really necessary. Make sure that everything you need to retain between calls is returned to the main module. DO NOT count on any variables being retained in the edit/update modules. Several different jobs will be accessing once you convert to a server program. Again I set on LR between each call. Now write a server program, I prefer data queue based, to read data queue entries and process the responses. I lay out the data queue into an file with fields big enough to hold the data structures being passed. I use the job number for the key to the data queue. The server reads with a key value of zero and writes with the key value equal to the job number of the job that send the entry to pass. This can be a simple CL program that reads the data queue and call the RPG that you are calling above although I think it is easier in RPG. Finally take the program with the screen I/O and change to send a data queue entry instead of call the edit/update module. The layout of the data queue I use is in general: 1. Action 10 char 2. Time Stamp timestamp 3. Return key 6 char (senders job number) 4. Sending file structure (optional before & after image) 5. Work variable structure I prefer the data queue approach. That way I can have several server programs reading the data queue. This gives me a many to many relationship. By keying the data queue with a 6 char key you can control what program reads what entry. The server program wait with a key value of "SERVER" and send responses back to the same data queue using the return key. I also have a nightly job that deletes old data queue entries. We use special actions to start more occurrences of the server, end the servers and reset the servers. Christopher K. Bipes mailto:ChrisB@Cross-Check.com Sr. Programmer/Analyst mailto:Chris_Bipes@Yahoo.com CrossCheck, Inc. http://www.cross-check.com 6119 State Farm Drive Phone: 707 586-0551 x 1102 Rohnert Park CA 94928 Fax: 707 586-1884 If consistency is the hobgoblin of little minds, only geniuses work here. Karen Herbelin - Readers Digest 3/2000 -----Original Message----- From: Colin.A.Williams@chase.com [mailto:Colin.A.Williams@chase.com] Sent: Monday, November 20, 2000 3:58 AM To: MIDRANGE-L@midrange.com Subject: Seperating I/O from business logic I have seen old messages on this where people have discussed seperating file and DDS operations from the business rules( validation and calculations). Whats the best way to start with something like this, how have other people acheived this. Is it even feasible with RPG? +--- | This is the Midrange System Mailing List! | To submit a new message, send your mail to MIDRANGE-L@midrange.com. | To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com. | To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com. | Questions should be directed to the list owner/operator: david@midrange.com +---
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