Ok..I was under the impression that the rule would fire for each Order object that was injected, and in that case variables apply to each Order, hence accessing them from the consequences(right side) would be from an indfividual Order. I guess I am misundertanding how it works.
Thanks for the clarification.
Chris
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Wednesday, June 17, 2009 1:37 PM
To: Rules Users List
Subject: Re: [rules-users] averages on different data types
Chris,
Not sure what you mean. If you want to know what is in there for debug purposes, I guess the best way is to implement your own average() accumulate function that prints out (or do whatever you want) with the bound variables/facts.
For regular use, it does not makes sense to allow access to such variable because it is bound to multiple values. For instance:
$tot : Number() from accumulate(
Order( $value : value ),
sum( $value ) )
This pattern will sum all the values from all the Order facts in the working memory. Lets imagine that it would be possible to access the $value variable outside the accumulate, what Order would it be bound to? So, it makes no sense...
[]s
Edson2009/6/17 Chris Richmond <crichmond@referentia.com>
So how can I access variables that I have populated from within that scope delimiter(accumulate)? For instance if I did want to access the delayTime, what strategy should be used?
Thanks,
Chris
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Wednesday, June 17, 2009 11:49 AM
To: Rules Users List
Subject: Re: [rules-users] averages on different data types
Chris,
Remember that accumulate is a scope delimiter, meaning variables bound inside accumulate are not visible outside of it. The error message you see is the MVEL way of saying: non-existing variable (I guess you are using mvel as the dialect for the consequence).
If you want to know what data objects are being inserted/expired from the working memory, use a working memory listener.
[]s
Edson2009/6/17 Chris Richmond <crichmond@referentia.com>
Hi guys,
Building from the stockticker sample, I have been running my own average aggregates over time and window length and I have the following rule…it simply runs a last 10 average and outputs the average(in theory).
rule "show averages"
when
$n : Number( doubleValue > 0 ) from accumulate (
$mdo : MyDataObject($tm: delayTime) over window:length(10) from entry-point "DataObject stream",
average( $tm )
)
then
System.err.println($tm);
End
I have set the limit to 0 for the average because I simply want to have it fire every time, no matter the average(they are all positive)
However I get this error:
Unable to build expression for 'consequence': Failed to compile: 1 compilation error(s):
- (1,3) unqualified type in strict mode for: $tm '
System.err.println($tm);
' : [Rule name='show averages']
If I have the consequence
System.err.println($n);
Then it outputs the average no problem, but I am trying to simply output that indifidual value, delayTime which I have stored in $tm is an integer, so I cannot figure out why I cannot output this value. Similarly if I simply try as a consequence:
System.err.println($ mdo.delayTime);
I get a similar error.
What am I doing wrong?
Thanks,
Chris
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Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
_______________________________________________
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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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