Re: Triggers? -- JAVA400-L

Hi
we have been doing this kind of stuff also, we need to
create Purchase Order PDF files and email them to
verndors, so RPG program write this info in a message
queue, a java program is listening to this queue,(we
have a seperate subsystem for running this java
program)
as soon as it get message, this listening program
creates a thread which creates PDF file, emails it and
then is killed.
Ashish
--- Joe Sam Shirah <jshirah@xxxxxxxxxxxxx> wrote:

> 
>     Hi Chad,
> 
>     Just to follow up on Chris' response:  Many
> programmers think triggers
> are a great idea until they do tons of work on each
> DB change and things
> begin to bog down.  You want to do the least amount
> of work necessary when
> you use a trigger, regerdless of language.
> 
>     For example, one of our clients sends a fax when
> certain criteria is met
> for a database operation.  Rather than having the (
> RPG ) trigger do the
> time comsuming work, it just sends notification and
> the required info to a
> message queue, then returns.
> 
>     A Java program monitors the message queue and
> performs all necessary
> operations asynchronously, so the original
> application throughput is
> affected as little as possible.
> 
> 
>                                                     
>     Joe Sam
> 
> Joe Sam Shirah -        http://www.conceptgo.com
> conceptGO         -       
> Consulting/Development/Outsourcing
> Java Filter Forum:      
> http://www.ibm.com/developerworks/java/
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> http://www.jguru.com/faq/Java400
> 
> 
> ----- Original Message -----
> From: <chris.delashmutt@xxxxxxxxxxxxx>
> To: "Java Programming on and around the iSeries /
> AS400"
> <java400-l@xxxxxxxxxxxx>
> Cc: <java400-l@xxxxxxxxxxxx>;
> <java400-l-bounces@xxxxxxxxxxxx>
> Sent: Friday, January 21, 2005 12:42 PM
> Subject: Re: Triggers?
> 
> 
> >
> > We do this now, but you have to write a little
> wrapper around the Java to
> > get it to be called from the trigger.
> >
> > We've actually accomplished this on V5R1 via
> creating a Java Stored
> > procedure, and then calling that stored procedure
> via an SQL trigger.
> This
> > is nice because the DB is managing the lifecycle
> of the JVM, and I believe
> > the startup cost of the JVM only has to be paid
> once per job.
> >
> > We've also created a small externally defined
> trigger in a high level
> > language that actually calls/submits a call to run
> a Java class.  This
> > works ok as well, except that the JVM has to be
> started for each call.
> > That may not be an issue if this is on a slowly
> changing file.
> >
> > I would just say that in either of these methods
> you want to make sure
> that
> > you realize exactly how often this trigger is
> going to be called.  It is
> > very easy to end up in a bad situation if you
> attach a trigger to a file
> > that has transactions performed on it often. 
> You'll either slow down your
> > operations tremendously using the first method, or
> end up with too many
> > jobs submitted for the system to handle in a
> timely manner in the second.
> > Just be careful!
> >
> > Chris DeLashmutt
> > Senior R&D Analyst
> > LeasePlan USA
> > 1165 Sanctuary Pkwy., Alpharetta, GA 30004
> > Phone: 678-202-8695
> > Fax: 678-921-4895
> > ClearCase problems? Check out the LeasePlan
> ClearCase FAQ for answers!
> >
> >
> >
> >                       "cornelius, chad"
> >                       <chad.cornelius@xxxxxxxxxx  
>      To:
> "'java400-l@xxxxxxxxxxxx'" <java400-l@xxxxxxxxxxxx>
> >                       tate.co.us>                 
>      cc:
> >                       Sent by:                    
>      Subject:
> Triggers?
> >                       java400-l-bounces@midrange
> >                       .com
> >
> >
> >                       01/21/2005 12:13 PM
> >                       Please respond to Java
> >                       Programming on and around
> >                       the iSeries / AS400
> >
> >
> >
> >
> >
> > Does anyone know if it is possible to create a
> trigger that can execute a
> > java class?
> >
> >
> >
> > Thanks,
> >
> > Chad
> >
> 
> 
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