David:
All true! I just got used to using user spaces with the IBM APIs, and they
seemed easy enough.
--
Jim Oberholtzer
Agile Technology Architects
-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of David
Gibbs via RPG400-L
Sent: Friday, August 16, 2019 8:31 AM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Cc: David Gibbs <david@xxxxxxxxxxxx>
Subject: Re: Parameter passing between programs
On Fri, Aug 16, 2019 at 8:23 AM Jim Oberholtzer
<midrangel@xxxxxxxxxxxxxxxxx> wrote:
Agreed. Data Queues would work too. I just think user spaces are a
bit faster, albeit maybe not enough to care.
The reason I like data queue's is that I can send structured data records
back and forth easily.
Generate a unique key, put data into the queue using that key, call a
program and pass the name of the queue and the key (or just the key, if the
queue name is constant), and the called program retrieves the data using the
key.
If the called program needs to generate a response, it puts the data back on
the same queue using the same key, and the caller processes the data.
The other nice thing about data queues is that you can also have a program
simply watch a queue for data to arrive.
I do that with some java code ... I create a thread that watches a data
queue and waits for data to arrive (timing out periodically to check if it
needs to shut down). The RPG code sends the queue entry and the java process
handles it.
david
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