[rules-users] Event streams

[Greg Barton]

Yes to both.  However to the first part (rules firing "automatically") you need to use fireUntilHalt() instead of fireAllRules().  fireUntilHalt blocks (until halt is called) so you need to invoke it in a separate Thread.  Then from another thread you can insert events into the entry points.  For the second item (long lived event) you must use an @expires tag in your object declaration and be running in STREAM mode.




________________________________
From: Chris Richmond <crichmond at referentia.com>
To: Rules Users List <rules-users at lists.jboss.org>
Sent: Friday, September 25, 2009 3:17:52 PM
Subject: [rules-users] Event streams

 
It is my understanding that an event will be detected as
soon as it is inserted into a stream…meaning that I don’t have to
explicitly call fireRules in order to evaluate events, but them will be
evaluated as soon as I insert them into a stream, so a rule like the one below
would fire as soon as I perform  datastream.insert(myDataStreamObject) without
having to explicitly fire rules? Is that behavior correct/intended?
 
 
Declare MyDataStreamObject
            @role(event)
End
 
 
//rule “detect a stream data object”
 
When
            MyDataStreamObject()
from entry point “DATA”
Then
            System.err.println(“data
object inserted”);
end
 
 
 
 
Also, could I generate another event(long lived…say it
lives 1 minute) so that if the above event detector fired and some condition
was  met, I could have it fire some event within the rule engine? Something
like the following:
 
 
//rule “detect a stream data object”
 
When
            MyDataStreamObject($val:
fieldValue < 20) from entry point “DATA”
Then
            //I
want to raise an event purely from this rule that will live for one minute or
so, that I can use to further refine this rule, to make sure this rule makes
            //sure
that the MyDataStreamObject event “NOT INCLUDED” within the
generated longer lived event lifetime. Efffectively preventing me from firing
this if one of my
            //generated
events is still living
end
 
 
Thanks,

Chris


      
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