[Openroad-users] IIW4GL_SENDUSEREVENT

[Kim Ginnerup]

I did a test on the IIW4GL_SENDUSEREVENT.
I found that using the OpenROAD Server as a communication buffer between OpenROAD Clients was simple and very fast, especially when there is no SQL involved.
This way I used the external event as an alert to the client that something was waiting for ir in the Appserver. A little like a subscriber model.



Kim

-----Oprindelig meddelelse-----
Fra: openroad-users-bounces at peerlessit.com [mailto:openroad-users-bounces at peerlessit.com] På vegne af Richard M. Wright
Sendt: 17. november 2006 15:22
Til: International OpenROAD Users
Emne: Re: [Openroad-users] IIW4GL_SENDUSEREVENT

Hi Jim,

I am doing something similar to the files but with a DB Table - both
images have sessions to same DB. I use the table to communicate event
information due to limitation of IIW4GL_SENDUSEREVENT having message
integer only. 

I start the second image from the sender and then raise events for the
second image
It may well be that the second image is not ready to receive. I shall
investigate waiting until the second image writes a 'ready to receive'
flag to the table and then raise the event. 

Many thanks for your suggestion. 

Regards

Rich

-----Original Message-----
From: openroad-users-bounces at peerlessit.com
[mailto:openroad-users-bounces at peerlessit.com] On Behalf Of Antill, Jim
Sent: 14 November 2006 09:36
To: International OpenROAD Users
Subject: Re: [Openroad-users] IIW4GL_SENDUSEREVENT


Rich,

We're using events here (using C code) to communicate between multiple
OpenROAD applications. Haven't had any problems with events being
dropped.
We're using OR4.0 on WinXP.

One problem we did have was ensuring that the sending application waited
for the receiving application to fully start before trying to send
events to it.
In the end we solved this by getting the receiving app to write to a
file when it had finished setting itself up. The sending and receiving
applications are started at the same time. The sending application
monitors the file, looking for a message from the receiving app to say
it's ready.
Only once this message has been detected does the sending app start to
attempt sending events to the receiver.

In order to make the event handling a little more robust we also use a
logfile. When the receiving app gets an event it writes a message to the
logfile saying that the event has been received (each event is given a
unique numerical ID so it can be identified). When the sender issues an
event it monitors this logfile to ensure that the event has been
received OK. If, after a predetermined period, no confirmation of the
receipt of the event is in the log the event can either be sent again or
the error reported.

It's not particularly elegant but it's simple and works pretty well.

Hope that helps.

Regards,
Jim


-----Original Message-----
From: openroad-users-bounces at peerlessit.com
[mailto:openroad-users-bounces at peerlessit.com]On Behalf Of Richard M.
Wright
Sent: 13 November 2006 18:01
To: International OpenROAD Users
Subject: [Openroad-users] IIW4GL_SENDUSEREVENT


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OR 4.1 / XP

Hi,

I am trying to communicate with a separate image using events.
I am using IIW4GL_SENDUSEREVENT (in 3GL) to handle messages between the
two. The first time I raise an event and use this method, the
communication is hit or miss.

I am sure that the receiver has registered correctly for the event.

I have set up a loop to continually raise the event until I receive a
successful return, this ranges from 1 (most of the time ) to many
thousand times

Once I have successfully raised an event (and it has been received) then
everything is fine for subsequent events.

Has anyone experienced something similar? And if so did you find a
better solution than a loop to retry?


Many Thanks

Rich Wright


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