IConstraint is indeed used for storing the constraint for each of the outgoing connections of an (X)OR split.  This constraint is currently represented as a String, but this does not mean it will be interpreted at runtime.  We are currently thinking about making these conditions similar to the normal LHS of a rule, so you could say something like when "Person(age > 20)" as constraint.  These constraints will then be evaluated the same way as the LHS of a rule.  I'm pretty close to getting (X)OR splits working, the tooling (eclipse) is still the hardest part though.
 
The definition of variables for a ruleflow would allow you to define variables local to one specific ruleflow (instance).  They are similar to globals but their scope is different: globals have one value for an entire workingMemory, ruleflow variables would be local to one ruleflow (instance).  Note that these variables are still on the TODO list as well.
 
Kris
 
----- Original Message -----
From: Anstis, Michael (M.)
To: Rules Dev List
Sent: Tuesday, May 15, 2007 1:16 PM
Subject: [rules-dev] RE: [rules-users] Using the Rule Flow Builder GUI

So I'm increasingly excited with ruleflow.... but I'm afraid I want to understand more... Is the decision stuff for ruleflow set to be in 4.0? Can more information as to the role of IConstraint and IVariable be given? Will IConstraint continue to be Strings (that are evaluated at runtime)? What purpose do IVariables have; are they bound to (WorkingMemory) Global variables? Can IConstraints access Fact properties (so decisions are made on a per-fact basis - probably horredous truth maintenance issues - rather than global to the process). I'd love to try and contribute...
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Kris Verlaenen
Sent: 14 May 2007 22:57
To: Rules Users List
Subject: Re: [rules-users] Using the Rule Flow Builder GUI

> 1) Yes kris is still working on the decision stuff for ruleflow.
Some of the stuff is already partially implemented, but an (X)OR split (where you can define which path(s) to follow based on some conditions) is still on the TODO list.

> 3) The Eclipse GUI ruleflow builder doesn't seem to allow loops in the flow.
It does support the creation of loops: create an XOR split as the starting point of your loop, you can then always create nodes that link back to this starting point, resulting in a loop.  Note that looping kind of depends on the (X)OR split as well, as that would allow you to exit the loop in specific conditions (now you will probably create an endless loop).  I hope I'll be able to add that piece of functionality pretty soon to trunk.
 
Kris
 

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