[rules-users] Synch Business Object / Working Memory
Anstis, Michael (M.)
manstis1 at ford.com
Fri Apr 11 10:57:03 EDT 2008
I am confident Drools supports what you are looking for; did you try
update() - or modify() - in the "then" part of the rule (and not in Java as
you code snippet)?
Can you explain more the need for the "computed" flag on the fact? Is the
value of a property set sometimes whilst calculated at other times?
Stick with both Drools and the group - we'll get you to where you want to
be.
_____
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 15:41
To: Rules Users List
Subject: RE: [rules-users] Synch Business Object / Working Memory
First, thank you for yours answers which are very clear. Your solution will
probably work. I'm just desapointed that there is no way to synchronized the
shadow with the object. That would be great for my work.
_____
Subject: RE: [rules-users] Synch Business Object / Working Memory
Date: Fri, 11 Apr 2008 14:57:52 +0100
From: manstis1 at ford.com
To: rules-users at lists.jboss.org
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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