[rules-users] Synch Business Object / Working Memory

Fri Apr 11 09:57:52 EDT 2008

Do you need ruleflow? Perhaps this is too simple and I misunderstood.

package com.sample;

public class Test {

    private Integer a;
    private Integer b;
    private Integer c;

    public Integer getA() {
        return a;
    }

    public Integer getB() {
        return b;
    }

    public Integer getC() {
        return c;
    }

    public void setA(Integer a) {
        this.a = a;
    }

    public void setB(Integer b) {
        this.b = b;
    }

    public void setC(Integer c) {
        this.c = c;
    }

}

package com.sample

import com.sample.Test

rule "rule 1"
    salience 90
    when
        a : Test( a != null, b == null )
    then
     System.out.println("setting b to 10");
        a.setB(10);
        update(a);
end

rule "rule 2"
    salience 80
    when
        a : Test( b : b != null, c == null )
    then
     System.out.println("setting c to b x 5");
        a.setC(b * 5);
        update(a);
end

rule "rule 3"
    salience 70
    when
        a : Test( c != null )
    then
     System.out.println("c = " + a.getC());
end

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Jonathan
Guéhenneux
Sent: 11 April 2008 13:23
To: Rules Users List
Subject: RE: [rules-users] Synch Business Object / Working Memory

Indeed, it works but I will have to use such booleans for a lot of rules.

Cause my rule flow is schematically :

compute A
compute B(A)
compute C(B)
...

Perhaps I may create several ruleflows, one per independant computing?

  _____  

Subject: RE: [rules-users] Synch Business Object / Working Memory
Date: Fri, 11 Apr 2008 12:11:32 +0100
From: manstis1 at ford.com
To: rules-users at lists.jboss.org

I was thinking something more like this:-

package com.sample

import com.sample.Test

rule "rule 1 - 1"
    salience 90
    when
        a : Test(
         computed == "false",
            c < 15,
            d >= 75)        
    then
     System.out.println("setting e to 0");
        a.setE(0);
        update(a);
end

rule "rule 1 - 2"
    salience 10
    when
        a : Test(
            computed == "false",
            c < 15,
            d >= 75)        
    then
     System.out.println("setting e to 1");
        a.setE(1);
end

Note rule "rule 1 - 2" deliberately uses the same patterns as rule "rule 1 -
1".

package com.sample;

public class Test {

    private boolean computed =false;
    private int c=0;
    private int d=80;
    private int e;

    public String getComputed(){
       if(computed)
          return "true";
       else
          return "false";
    }

    public int getC() {
        return c;
    }

    public int getD() {
        return d;
    }

    public void setE(int e){
        this.e = e;
        computed = true;
    }

}

Rule "rule 1 - 1" is the only rule to run (and runs once); the second
activatino being cancelled due to the update to "computed". Here's the audit
view:-

<object-stream>
  <list>
    <org.drools.audit.event.ActivationLogEvent>
      <activationId>rule 1 - 1 [1]</activationId>
      <rule>rule 1 - 1</rule>
      <declarations>a=com.sample.Test at 67126712(1)</declarations>
      <type>4</type>
    </org.drools.audit.event.ActivationLogEvent>
    <org.drools.audit.event.ActivationLogEvent>
      <activationId>rule 1 - 2 [1]</activationId>
      <rule>rule 1 - 2</rule>
      <declarations>a=com.sample.Test at 67126712(1)</declarations>
      <type>4</type>
    </org.drools.audit.event.ActivationLogEvent>
    <org.drools.audit.event.ObjectLogEvent>
      <factId>1</factId>
      <objectToString>com.sample.Test at 67126712</objectToString>
      <type>1</type>
    </org.drools.audit.event.ObjectLogEvent>
    <org.drools.audit.event.ActivationLogEvent>
      <activationId>rule 1 - 1 [1]</activationId>
      <rule>rule 1 - 1</rule>
      <declarations>a=com.sample.Test at 67126712(1)</declarations>
      <type>6</type>
    </org.drools.audit.event.ActivationLogEvent>
    <org.drools.audit.event.ActivationLogEvent>
      <activationId>rule 1 - 2 [1]</activationId>
      <rule>rule 1 - 2</rule>
      <declarations>a=com.sample.Test at 67126712(1)</declarations>
      <type>5</type>
    </org.drools.audit.event.ActivationLogEvent>
    <org.drools.audit.event.ObjectLogEvent>
      <factId>1</factId>
      <objectToString>com.sample.Test at 67126712</objectToString>
      <type>2</type>
    </org.drools.audit.event.ObjectLogEvent>
    <org.drools.audit.event.ActivationLogEvent>
      <activationId>rule 1 - 1 [1]</activationId>
      <rule>rule 1 - 1</rule>
      <declarations>a=com.sample.Test at 67126712(1)</declarations>
      <type>7</type>
    </org.drools.audit.event.ActivationLogEvent>
  </list>
</object-stream> 

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Jonathan
Guéhenneux
Sent: 11 April 2008 11:33
To: Rules Users List
Subject: RE: [rules-users] Synch Business Object / Working Memory

Ok, I think I understood well. I modified my business code, now I call if

(wm != null)
            wm.update(wm.getFactHandle(this), this);

each time a properties is modified.

But it is worse. Rules that sould be activated only once actually loop, even
if I add the no-loop clause.

I understand why they loop, assuming update = (rectact + insert), but I dont
get a solution to my problem. I just want to notify an object changement in
order to read again the properties, but I dont want to restart the ruleflow.

Sorry, but I find hard to say it in english because even in french, it's not
very clear ;)

  _____  

Subject: RE: [rules-users] Synch Business Object / Working Memory
Date: Fri, 11 Apr 2008 10:39:41 +0100
From: manstis1 at ford.com
To: rules-users at lists.jboss.org

In essence, yes. Have a look at "update" in the manual (and a read on Shadow
Facts will probably be useful too).

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Jonathan
Guéhenneux
Sent: 11 April 2008 10:24
To: Rules Users List
Subject: RE: [rules-users] Synch Business Object / Working Memory

yes, i made a mistake. its a.setE(...) and not c.setE(...).

I don't call update. If I dont call update, properties of an object are just
read one time for all rules?

  _____  

Subject: RE: [rules-users] Synch Business Object / Working Memory
Date: Fri, 11 Apr 2008 09:47:43 +0100
From: manstis1 at ford.com
To: rules-users at lists.jboss.org

I guess the example is a simplification as "c" (in RHS) has not been bound
to a fact.

Anyway, that aside, do you call "update" to ensure WM knows of changes to
facts otherwise properties need to be "time-constant" which in your example
they are not.

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Jonathan
Guéhenneux
Sent: 11 April 2008 09:34
To: Rules Users List
Subject: [rules-users] Synch Business Object / Working Memory

Hi,

I have two rules :

rule "rule 1 - 1"

    salience 90
    ruleflow-group "rfg1"
    when
        a : A(
            eComputed == "false",
            c < 15,
            d >= 75)        
    then
        c.setE(0);
end

rule "rule 1 - 2"

    salience 10
    ruleflow-group "rfg1"
    when
        a : A(
            eComputed == "false",
            c >= 15,
            d >= 75)        
    then
        c.setE(1);
end

and part of the corresponding business code :

public class A {

    ...

    public String getEComputed(){
       if(eComputed)
          return "true";
       else
          return "false";
    }

    ...

    public void setE(int e){
        this.e = e;
        eComputed = true;
    }

    ...

}

so, I expected that if the first rule is activated, the second won't be. But
according to my tests, the two rule can be fired on the same object A.
While debugging, I noticed the getEComputed method was only called once. I
suppose that I should write this :

rule "rule 1 - 1"

    salience 90
    ruleflow-group "rfg1"
    when
        a : A(
            eComputed == "false",
            c < 15,
            d >= 75)        
    then
        c.setE(0);
        c.setEComputed("true);
end

rule "rule 1 - 2"

    salience 10
    ruleflow-group "rfg1"
    when
        a : A(
            eComputed == "false",
            c >= 15,
            d >= 75)        
    then
        c.setE(1);
        c.setEComputed("true);
end

But I would prefer another solution. Thanks for help.

  _____  

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