Re: How to inform a web page that a submitted job is ended -- RPG400-L

There is a form of polling known as long-polling. The submitted job sends
an entry to a data queue when it completes. The web application calls a
procedure that waits a minute or more for the entry to be placed on the
queue. Repeat the polling cycle until the data queue entry is received.

On Thu, Jul 26, 2018 at 9:12 AM, Maria Lucia Stoppa <mlstoppa@xxxxxxxxx>
wrote:

As a matter of fact, I think the solution is the mix of the two options.

Submitted job (we usually calc unique ids for our tables) traces its
execution's steps until it finishes whereas web page polls this new control
table to show the end user what's going on.

Lucia

Il giorno gio 26 lug 2018 alle ore 16:52 Bradley Stone <bvstone@xxxxxxxxx>
ha scritto:

Well, you really only have 2 options..

1. polling (easy to do with js)
2. somehow alerting your web app the process is done. You still need

some

unique id for the job here but this may end up being more complicated

than

you want.

Bradley V. Stone
www.bvstools.com
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used.

On Thu, Jul 26, 2018 at 9:23 AM Maria Lucia Stoppa <mlstoppa@xxxxxxxxx>
wrote:

@Nathan
Actually, I haven't thought of sending text or email to the user and in
fact, I may suggest it.
I don't know what a web socket service is, can you explain it a little

more

so I can ask web developers to see if we may adopt it?.

@Bradley
The idea of recording the job status is good, though it means that

polling

is the only option.

Thank you very much.
Lucia

Il giorno gio 26 lug 2018 alle ore 16:05 Bradley Stone <

bvstone@xxxxxxxxx>

ha scritto:

How I've done this is make a simple file with a unique job id (that I
generate) and a status. When a job is submitted a record is written

to

that file with a status of "started" by the job that submits the

processing

job. (The id is passed along to the processing job as well).

Then the processing program can update that status file any time it

likes

(with percentages complete, number or records processed, what step is

being

performed, etc).

The web program polls the file until it is complete.

Worked pretty slick. I made sure that the program in batch updated

the

status often so that it appeared to the user that something was

actually

going on. I know one thing we found is if users just saw

"processing..."

and it was something that took longer than 20 seconds they would
continually refresh their screens.. lol

Bradley V. Stone
www.bvstools.com
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On Thu, Jul 26, 2018 at 2:45 AM Maria Lucia Stoppa <

mlstoppa@xxxxxxxxx

wrote:

Hi all. I apologize if an answer to my question already exists but

as

the

search engine is still not working I couldn't find any post on this
subject. Also, I know very little about communications between

iSeries

and

external HTTP server.

The scenario consists of a web page run by an IIS HTTP server which

makes a

call to a stored procedure on our iSeries; the stored procedure is

an

RPGLE

program which submits a job under QBATCH subsystem: having the job
submitted is an obliged option because it takes a lot for it to

complete.

When the submitted job ends how can it inform or wake the web page

to

have

the web page do something else?

So far, I could only think of having the web page continuously

pooling

the

iSeries until a certain condition is reached, such as a certain row

on

a

table written by the submitted job before ending its execution,

but I

am

pretty sure this is a very usual need and it's my lack of knowledge

about

how to approach this issue.

Please, can you suggest me how to address this question or where I

can

find

technical documentation on it?

Thank you very much in advance

Lucia

--

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