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(a)yahoo.com&gt;

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(a)yahoo.com&gt;

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(a)gmail.com&gt; wrote: From: Michael Anstis <michael.anstis(a)gmail.com&gt; Subject: Re: [rules-users] How to count number of facts of a type in memory? To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; 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(a)yahoo.com&gt; 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(a)gmail.com&gt; wrote: From: Michael Anstis <michael.anstis(a)gmail.com&gt; Subject: Re: [rules-users] How to count number of facts of a type in memory? To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; 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(a)yahoo.com&gt; 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 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -----Inline Attachment Follows----- _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -----Inline Attachment Follows----- _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Wolfgang I tried both using collect and accumulate and they both worked as you suggested.      ArrayList( $total : size>0 ) from collect ( Asset())       Number ($total:intValue ) from accumulate ($asset:Asset() ,count($asset))  Thanks, Ram --- On Sat, 9/3/11, Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; wrote: From: Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; Subject: Re: [rules-users] How to count number of facts of a type in memory? To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Saturday, September 3, 2011, 9:47 PM 2011/9/4 puja nandamuri <med_9501(a)yahoo.com&gt; The first operand of collect is a pattern, not a bound variable. Therefore, use     ArrayList($total:size >0)  from collect ( Asset() ) Just for counting, accumulate would also be possible:    Number( $total: intValue ) from accumulate( Assert(), count(1) ) -W _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users