[rules-users] How to count number of facts of a type in memory?

[puja nandamuri]

I tried to create the following rule using a simple drl to just count the number of Asset facts in memory. 
An Asset can be a very simple class. I am not sure if the fields or methods are really relevant in this rule.

rule " Count number of Assets Rule"
dialect "mvel"
when
asset:Asset()ArrayList($total:size >0)  from collect ( asset)
then
System.out.println(" Number of Assets in memory"+total);
end
This fails. my understanding of how collect works seems to be wrong :(
can you please correct the mistake I might be doing here ?

--- On Sat, 9/3/11, Michael Anstis <michael.anstis at gmail.com> wrote:

From: Michael Anstis <michael.anstis at gmail.com>
Subject: Re: [rules-users] How to count number of facts of a type in memory?
To: "Rules Users List" <rules-users at lists.jboss.org>
Date: Saturday, September 3, 2011, 1:24 PM

Sure, just look at the examples of "collect".

You could use a XLS decision table, or IIRC a guided DRL rule in Guvnor - just not the web guided decision table.

2011/9/3 puja nandamuri <med_9501 at yahoo.com>


Michael,
ThankYou for your speedy feedback.
Is it possible to count the number of fact types in a drl if not in a Guided decision table editor ?

--- On Sat, 9/3/11, Michael Anstis <michael.anstis at gmail.com> wrote:


From: Michael Anstis <michael.anstis at gmail.com>

Subject: Re: [rules-users] How to count number of facts of a type in memory?
To: "Rules Users List" <rules-users at lists.jboss.org>
Date: Saturday, September 3, 2011, 11:27 AM


It is not possible with the web guided decision table at this stage as you need to use "collect" as you rightly suspect.

We have numerous improvements to complete to make the web editor more
 powerful.


2011/9/3 puja nandamuri <med_9501 at yahoo.com>


Hi,
How can I count the number of facts of a partilcuar type inserted into the rules session?


lets say, I insert several instances of fact called Asset into the rules session.
I need to write a web guided decision table that outputs a specifc text value in an action column based on the number of assets in memory.




numberofAssets      result
1                            result12                            result23                          
  result3
How can I create a condition column that counts the number of Assets in memory ?


question2:
If I want to write a drl  that needs to count number of Assets in memory and print that value, can I use a collect from or is it only used with a Collection ?


As always ,
 Thank You all for your fast responses and ideas.
Thanks,
Ram
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