Re: ProgramCall and ProgramParameter classes

Thanks Dave for the explanation.

A while ago Jim Mason mentioned that Runtime.exec() could also be used to
call RPG programs. It would be interesting to know how this is done. Can
somebody give an example? A few references would help too.

Thanks.
Bruce

-----Original Message-----
From: Dave Wall <dawall@us.ibm.com>
To: JAVA400-L@midrange.com <JAVA400-L@midrange.com>
Date: Wednesday, April 04, 2001 4:22 PM
Subject: Re: ProgramCall and ProgramParameter classes


>
>I think the important considerations are:
>
>1) How familiar are you with JDBC.  If you are already an expert at JDBC
>then using JDBC procedure call is a natural way for you to call the
>program.  If you don't know anything about JDBC but are already using some
>other Toolbox component then you may go with ProgramCall just because that
>is an interface you are used to.  If you don't know either then you have to
>learn one.  I think ProgramCall is easier but that is just my opinion.
>
>2) Complexity of the buffer.  Those of you who use AS/400 APIs know the
>input and output buffers of many APIs are obviously created by committee.
>They can be very complex with their multiple repeating variable length
>structures.  For these types of buffers PCML is the way to go.  In a text
>file you define the generic layout of the buffer.  At run time PCML does
>all the messy math to address into the buffer to pull out fields.  PCML is
>a little slower, however, so if your buffer is simple PCML may not be worth
>the performance hit.
>
>3) If correctly written, the performance of ProgramCall vs JDBC is about
>the same, with PCML being a little slower.  Of the two, ProgramCall should
>be slightly faster just because there is less overhead on the client and
>server, but if your program takes any time at all you may not see a
>difference.  In either case connect time is significant.  If you need to
>call a program more than once you should use the same connection.  Toolbox
>in JTOpen 2.02 has connection pooling to help you reuse connections for
>both JDBC and ProgramCall
>
>I look foward to see the performance numbers some of you are gathering, to
>see if they match my number that ProgramCall is slightly faster.
>
>David Wall
>AS/400 Toolbox for Java
>
>
>"Bruce Jin" <brucej@MRC-PRODUCTIVITY.COM>@midrange.com on 04/04/2001
>08:53:10 AM
>
>Please respond to JAVA400-L@midrange.com
>
>Sent by:  owner-java400-l@midrange.com
>
>
>To:   <JAVA400-L@midrange.com>
>cc:
>Subject:  Re: ProgramCall and ProgramParameter classes
>
>
>
>
>I really wish to know the advantages/disadvantages in using JDBC procedure
>calls versus using Toolbox if my task is only to call RPG, CL, COBOL, and
>REXX from Java.
>
>Thanks.
>
>Bruce
>


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