• Subject: Re: Listening to changes in a file
  • From: "Dave Wall" <dawall@xxxxxxxxxx>
  • Date: Thu, 18 Jan 2001 14:27:14 -0600
  • Importance: Normal

I don't know of any way to trigger all the way down to a client running a
JDBC driver.  The closest thing the Toolbox has to offer is data queues.
You could write a trigger on the AS/400 that writes to a DQ.  On the client
you would issue a DQ read that is not resolved until something is put on
the queue.  At that time the client gets control and can do something.

On the topic of events the Toolbox does fire events but the event is highly
localized.  That is, the object fires an event only when it does something.
Take UserSpace.class for example.  It fires a 'written' event only when
that specific object writes to the space.  No event is fired when another
object in the same JVM or a different JVM, or a different program writes to
the UserSpace.  This makes Toolbox event support of little value but it is
all we could do based on what the server can do at this time.

David Wall
AS/400 Toolbox for Java

"DUCRET Gilles (GVA)" <Gilles.DUCRET@lloydsbank.ch>@midrange.com on
01/18/2001 06:50:05 AM

Please respond to JAVA400-L@midrange.com

Sent by:  owner-java400-l@midrange.com

To:   "'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
Subject:  Listening to changes in a file

Hi all,

We have an RPG program that write data to a file/table.
When an instance of a table is updated we would like to generate an event.
This event would be coded in Java.

Has anybody done that?

Is it possible to do this with component of the JT400 toolbox?
Is there any way to write Java listeners to data queues, or something else?

We have several solutions to do that but we think that something may
already exist in the toolbox.

Do you have any idea?


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