Re: [rules-users] How to inovke a Service...
James,
The consequence and function blocks in a DRL file are transformed
into a plain java method. It means you can do whatever you want and java
allows. So, if you are for instance inside an application server, you
cat get your JNDI context from there and do your stuff. Although, it is
usually better to have helper classes doing procedural code and keep the
consequence code clean to make rules maintance easier.
So, for exaple, you can have a helper class that has the actual code
to call the service you want and set it as a global for your rulebase.
Then in the consequence you call this class method with the given
paramenters.
Example:
package my.package;
global my.service.package.ServiceInvoker invoker;
rule "Cheese in stock"
when
$p : Person( $likes : likes )
$c : Cheese( type == $likes, quantity > 0 )
then
invoker.sendMessageToPerson( $p, "Your prefered cheese
("+$c.getType()+") is back in stock;" );
end
Inside your ServiceInvoker class you create the code to actually send
the message (procedural code).
This is only one way of doing it, but it is usually what is done.
Hope it helps.
[]s
Edson
jdepaul wrote:
I've done a little research since my first post and have been
experimenting
with the AgendaEventListener interface... I can register a component in
WorkingMemory that will 'listen' and be notified afterEventFired event -
this could be a good place from which to invoke my serivce, however, the
problem I'm having is that the event delivered doesn't seem to pass the
original Fact that caused the Event to fire, only the rule that got
activated is sent... How could I get the Fact that caused this event to
fire from that event object?
James
--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
JBoss, a division of Red Hat @ www.jboss.com