Re: HTTP API or Web Service concurrency issue

Mike,

Do you have anyplace in the jobs where
- PGMA and PGMB both use HTTP API
- PGMA calls PGMB
- PGMA hasn't finished using HTTP API before calling PGMB

That can cause problems as HTTP API doesn't support simultaneous
connections within a job (Activation group really)

You can work around it by running PGMA and PGMB in seperate activation
groups as HTTP API uses *CALLER.

Charles




On Wed, May 29, 2019 at 9:56 AM Mike Jones <mike.jones.sysdev@xxxxxxxxx>
wrote:

Hi Scott,

Not a multi-threaded program, but it is being called in a submitted jobs
environment on a large system hosting many companies, where the HTTP API
and the web service can be executed in multiple jobs at the same instant
(across different jobs).

I noticed yesterday we have a very old version. I'm already planning on
recommending we update to the current version. Because it could impact
many companies, that will be a bureaucratic and slow process.

Thanks for your help and feedback.

Mike

On Tue, May 28, 2019 at 9:46 PM Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>
wrote:

Mike.

What do you mean by "concurrency", here? Are you trying to call
HTTPAPI in a multi-threaded environment? You almost never see people
use multi-threaded code in RPG, so this would be very bizarre. HTTPAPI
is not designed for multi-threaded access.

If you are running multiple copies of HTTPAPI in separate jobs or
activation groups, there is no problem.

However, you are running an 11 year out-of-date version of HTTPAPI. Who
knows what bugs have been fixed in the past 11 years? I certainly can't
remember everything that has happened in that time. Considering

updating.

-SK

On 5/28/19 6:00 PM, Mike Jones wrote:

HTTPAPI Version 1.23 released 2008-04-24
OS/400 V7R3M0

We're using the HTTP API plus internal web services and are

occasionally

experiencing a concurrency issue, where the results of one web service

call

are getting mixed up with the results of a different web service call.

RPG <--> HTTP API <--> Java Web Service

Our RPG and Java teams don't think the problem is in their code (of

course,

which I don't necessarily believe). But, they asked me to look into if
there have ever been concurrency issues in the HTTP API product by

Scott

K. Has anyone seen any concurrency issues like that?

Mike

--
Scott Klement
http://www.scottklement.com

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