Re: Subprocedure Question

The binding directory is only used doing the compil.

If you have module in a binding directory, only those havin procedure needed
by your PGM will be included (copy) into your PGM.

----- Original Message ----- 
From: "Wall, Isa (ED)" <IWall@xxxxxxxxxxxxxxxxxxxx>
To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
Sent: Thursday, September 01, 2005 4:54 PM
Subject: RE: Subprocedure Question


> Paul,
>
> Thank you for your prompt response.  I have a question on performance.
> If I have all my modules in one binding directory would that affect
> performance?  I am picturing a program that only needs one file and yet
> I have attached a binding directory with thousands of modules to the
> program.  Is that a problem?
>
> I thought of separating the subprocedures to one module for each file
> and logicals.  The only benefit I can see is that my modules would be
> smaller, which will be a cleaner way of doing it.  Why would you do it
> that way?  I am open for suggestions...
>
> Thanks,
>
> Isa
>
>
>
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx
> [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Paul Morgan
> Sent: Thursday, September 01, 2005 10:33 AM
> To: rpg400-l@xxxxxxxxxxxx
> Subject: Re: Subprocedure Question
>
> Isa,
>
> You could create a module for each file with every module listed in the
> binding directory.  You could also create a service program using those
> modules with every service program in the binding directory.  Either way
> something is going to have to be listed in the binding directory.  You
> will
> end up with a binding directory with thousands of modules just as you
> have
> thousands of files.
>
> If you use service programs you will be sharing that file between
> programs.
> The file would be opened once in the service program.  If two programs
> use
> that file (service program) but one program calls the other program.
> The
> second program called from the first could do something with the file
> (SETLL, READ, CLOSE) that interferes with the first program.
>
> With modules a copy of the module gets created in each program.  Two
> programs that use that file would each get a copy of the module.  In the
> same example above the second program wouldn't intefer with the first
> program as the file would be opened twice.
>
> Sometimes sharing a file between programs is desirable.  Maybe the file
> is a
> code file that only has random retrieval (chain) of records.  In that
> case
> use a service program otherwise stick with modules.
>
> Have you considered making separate modules for the logical files
> instead of
> including them in the same module with the physical file?  You'd have a
> module for the physical file and one module for each logical file.
>
> Paul
>
> -- 
> Paul Morgan
> Senior Programmer Analyst - Retail
> J. Jill Group
> 100 Birch Pond Drive, PO Box 2009
> Tilton, NH 03276-2009
> Phone: (603) 266-2117
> Fax:   (603) 266-2333
>
> Isa wrote
>
> I would like to ask your option on the following subject.  I am planning
> on implementing subprocedures for all file actions.  For example, if you
> want to read, setll, open, update or write a record to a file you would
> call a subprocedure.  I am planning on creating a module for each file.
> Inside each module I would create all subprocedures related to that file
> and logicals.  My question is the next step which I don't know what is
> my best action.  I now have a module for each file do I create a binding
> directory for all the modules.  To me this does not make sense as we
> have thousands of file in our system.  So do I create a service program
> for each module and at compile time bind them as I need them?  Is there
> another way I can do this?  What is the best to handle this?
>
>
>
> -- 
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