4:48 a.m.
Hello,
Is it possible to run a rule from a group A, and if conditions of that rule
are satisfied that in consequence to tell Drools to run rules of a group B ?
And if it's possible, how to do that?
Thanks :-)
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5:01 a.m.
Please accept that my knowledge is based on 4.x and there might be other
alternatives in 5.
Rules are not "ran" but their patterns (LHS) evaluated as facts
(objects) are inserted into Working Memory. When all patterns in the LHS
of a rule are matched activations are placed on the agenda for execution
of the consequence (RHS) when fireAllRules() is called (or other
mechanisms to run what is on the agenda are invoked; such as RuleFlow).
So you could have rules in Group A cause Group B to receive the focus
but it is the RHS's execution order you control and not the pattern
matching - which will happen for Group A and Group B when facts are
inserted into WM.
Look at Agenda Groups and RuleFlow. This should help.
With kind regards,
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Thierry B
Sent: 21 January 2009 10:48
To: rules-users(a)lists.jboss.org
Subject: [rules-users] Run a set of rules in a group B from a rule in a
group A
Hello,
Is it possible to run a rule from a group A, and if conditions of that
rule
are satisfied that in consequence to tell Drools to run rules of a group
B ?
And if it's possible, how to do that?
Thanks :-)
--
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roup-A-tp21580767p21580767.html
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6:53 a.m.
Hello,
So if I've well understand :
- before calling fireAllRules(), Drools know for all rules (from any group)
definied in DRL files, those which all patterns in the LHS of a rule are
matched, and those rules are placed on a agenda.
At which moment exactly, Drools verified from a rule that all of its pattern
in the LHS are matched, if it's before callling fireAllRules() ?
- And fireAllRules() permit to execute all rules that are placed on agenda
- When using setFocus() from a java class or a rule, we can control the
order of rules to specify to execute rules from group B, and group C...
- So it's not possible to tell Drools that we don't want to execute a group
of rules if a rule A is not matched : in that group of rules : those which
all paterns match LHS will be inevitably executed.
All these points that I said, are exact?
Thanks :-)
Anstis, Michael (M.) wrote:
Please accept that my knowledge is based on 4.x and there might be other
alternatives in 5.
Rules are not "ran" but their patterns (LHS) evaluated as facts
(objects) are inserted into Working Memory. When all patterns in the LHS
of a rule are matched activations are placed on the agenda for execution
of the consequence (RHS) when fireAllRules() is called (or other
mechanisms to run what is on the agenda are invoked; such as RuleFlow).
So you could have rules in Group A cause Group B to receive the focus
but it is the RHS's execution order you control and not the pattern
matching - which will happen for Group A and Group B when facts are
inserted into WM.
Look at Agenda Groups and RuleFlow. This should help.
With kind regards,
Mike
--
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7:06 a.m.
New subject: Run a set of rules in a group B from a rule in agroup A
Hi,
See below.
"executing a rule" is really two parts: LHS pattern matching (which
can't be stopped for a given RuleBase) and execution of the RHS (which
can be controlled by the agenda and truth maintenance).
I hope my time away hasn't led to me giving wrong advice.
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Thierry B
Sent: 21 January 2009 12:53
To: rules-users(a)lists.jboss.org
Subject: RE: [rules-users] Run a set of rules in a group B from a rule
in agroup A
Hello,
So if I've well understand :
- before calling fireAllRules(), Drools know for all rules (from any
group)
definied in DRL files, those which all patterns in the LHS of a rule are
matched, and those rules are placed on a agenda.
At which moment exactly, Drools verified from a rule that all of its
pattern
in the LHS are matched, if it's before callling fireAllRules() ?
>> Yes, LHS is evaluated on workingMemory.insert(o). A call to
fireAllRules() executes the activations on the agenda (i.e. RHS queued
as a consequence of LHS being matched on workingMemory.insert(o)).
- And fireAllRules() permit to execute all rules that are placed on
agenda
>> Yes
- When using setFocus() from a java class or a rule, we can control the
order of rules to specify to execute rules from group B, and group C...
> I believe so.
- So it's not possible to tell Drools that we don't want to execute a
group
of rules if a rule A is not matched : in that group of rules : those
which
all paterns match LHS will be inevitably executed.
>> Wrong. The rules won't be executed (read as activations -
RHS -
won't be run) but you can't stop the LHS being evaluated.
All these points that I said, are exact?
Thanks :-)
Anstis, Michael (M.) wrote:
Please accept that my knowledge is based on 4.x and there might be
other
alternatives in 5.
Rules are not "ran" but their patterns (LHS) evaluated as facts
(objects) are inserted into Working Memory. When all patterns in the
LHS
of a rule are matched activations are placed on the agenda for
execution
of the consequence (RHS) when fireAllRules() is called (or other
mechanisms to run what is on the agenda are invoked; such as
RuleFlow).
So you could have rules in Group A cause Group B to receive the
focus
but it is the RHS's execution order you control and not the pattern
matching - which will happen for Group A and Group B when facts are
inserted into WM.
Look at Agenda Groups and RuleFlow. This should help.
With kind regards,
Mike
--
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roup-A-tp21580767p21582595.html
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7:23 a.m.
New subject: Run a set of rules in a group B from a rule in agroup A
Michael is right. It is just harder to explain than to do it. Just take
a look at agenda-groups or ruleflow-groups. Chose which one you prefer to
use it, place your rules in two separate groups: A and B.
If using agenda-groups, set initial focus to A, fireAllRules and make
sure that on the consequence of one of the rules from group A you set focus
to B. So if that rule never fires, B will never have the focus and will
never fire. Just remeber that agenda-groups work like a stack, so if you
want ALL rules from A to execute before B, add the setFocus on the rule with
the lowest salience in A.
Using ruleflow-groups is similar, but you draw your "flow" graphically,
and it does not work like a stack. Sometimes easier for your use case.
[]s
Edson
2009/1/21 Anstis, Michael (M.) <manstis1(a)ford.com>
Hi,
See below.
"executing a rule" is really two parts: LHS pattern matching (which
can't be stopped for a given RuleBase) and execution of the RHS (which
can be controlled by the agenda and truth maintenance).
I hope my time away hasn't led to me giving wrong advice.
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Thierry B
Sent: 21 January 2009 12:53
To: rules-users(a)lists.jboss.org
Subject: RE: [rules-users] Run a set of rules in a group B from a rule
in agroup A
Hello,
So if I've well understand :
- before calling fireAllRules(), Drools know for all rules (from any
group)
definied in DRL files, those which all patterns in the LHS of a rule are
matched, and those rules are placed on a agenda.
At which moment exactly, Drools verified from a rule that all of its
pattern
in the LHS are matched, if it's before callling fireAllRules() ?
>>> Yes, LHS is evaluated on workingMemory.insert(o). A call to
fireAllRules() executes the activations on the agenda (i.e. RHS queued
as a consequence of LHS being matched on workingMemory.insert(o)).
- And fireAllRules() permit to execute all rules that are placed on
agenda
>>> Yes
- When using setFocus() from a java class or a rule, we can control the
order of rules to specify to execute rules from group B, and group C...
>> I believe so.
- So it's not possible to tell Drools that we don't want to execute a
group
of rules if a rule A is not matched : in that group of rules : those
which
all paterns match LHS will be inevitably executed.
>>> Wrong. The rules won't be executed (read as activations - RHS -
won't be run) but you can't stop the LHS being evaluated.
All these points that I said, are exact?
Thanks :-)
Anstis, Michael (M.) wrote:
>
> Please accept that my knowledge is based on 4.x and there might be
other
> alternatives in 5.
>
> Rules are not "ran" but their patterns (LHS) evaluated as facts
> (objects) are inserted into Working Memory. When all patterns in the
LHS
> of a rule are matched activations are placed on the agenda for
execution
> of the consequence (RHS) when fireAllRules() is called (or other
> mechanisms to run what is on the agenda are invoked; such as
RuleFlow).
> So you could have rules in Group A cause Group B to receive the focus
> but it is the RHS's execution order you control and not the pattern
> matching - which will happen for Group A and Group B when facts are
> inserted into WM.
>
> Look at Agenda Groups and RuleFlow. This should help.
>
> With kind regards,
>
> Mike
>
>
--
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roup-A-tp21580767p21582595.html<http://www.nabble.com/Run-a-set-of-rul...
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_______________________________________________
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_______________________________________________
rules-users mailing list
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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
7:40 a.m.
New subject: Run a set of rules in a group B from a rule in agroup A
Ha ok, thanks :-)
Edson Tirelli-3 wrote:
Michael is right. It is just harder to explain than to do it. Just
take
a look at agenda-groups or ruleflow-groups. Chose which one you prefer to
use it, place your rules in two separate groups: A and B.
If using agenda-groups, set initial focus to A, fireAllRules and make
sure that on the consequence of one of the rules from group A you set
focus
to B. So if that rule never fires, B will never have the focus and will
never fire. Just remeber that agenda-groups work like a stack, so if you
want ALL rules from A to execute before B, add the setFocus on the rule
with
the lowest salience in A.
Using ruleflow-groups is similar, but you draw your "flow"
graphically,
and it does not work like a stack. Sometimes easier for your use case.
[]s
Edson
2009/1/21 Anstis, Michael (M.) <manstis1(a)ford.com>
> Hi,
>
> See below.
>
> "executing a rule" is really two parts: LHS pattern matching (which
> can't be stopped for a given RuleBase) and execution of the RHS (which
> can be controlled by the agenda and truth maintenance).
>
> I hope my time away hasn't led to me giving wrong advice.
>
> Mike
>
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org
> [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Thierry B
> Sent: 21 January 2009 12:53
> To: rules-users(a)lists.jboss.org
> Subject: RE: [rules-users] Run a set of rules in a group B from a rule
> in agroup A
>
>
> Hello,
>
> So if I've well understand :
>
> - before calling fireAllRules(), Drools know for all rules (from any
> group)
> definied in DRL files, those which all patterns in the LHS of a rule are
> matched, and those rules are placed on a agenda.
>
> At which moment exactly, Drools verified from a rule that all of its
> pattern
> in the LHS are matched, if it's before callling fireAllRules() ?
>
> >>> Yes, LHS is evaluated on workingMemory.insert(o). A call to
> fireAllRules() executes the activations on the agenda (i.e. RHS queued
> as a consequence of LHS being matched on workingMemory.insert(o)).
>
> - And fireAllRules() permit to execute all rules that are placed on
> agenda
>
> >>> Yes
>
> - When using setFocus() from a java class or a rule, we can control the
> order of rules to specify to execute rules from group B, and group C...
>
> >> I believe so.
>
> - So it's not possible to tell Drools that we don't want to execute a
> group
> of rules if a rule A is not matched : in that group of rules : those
> which
> all paterns match LHS will be inevitably executed.
>
> >>> Wrong. The rules won't be executed (read as activations - RHS -
> won't be run) but you can't stop the LHS being evaluated.
>
> All these points that I said, are exact?
>
> Thanks :-)
>
>
> Anstis, Michael (M.) wrote:
> >
> > Please accept that my knowledge is based on 4.x and there might be
> other
> > alternatives in 5.
> >
> > Rules are not "ran" but their patterns (LHS) evaluated as facts
> > (objects) are inserted into Working Memory. When all patterns in the
> LHS
> > of a rule are matched activations are placed on the agenda for
> execution
> > of the consequence (RHS) when fireAllRules() is called (or other
> > mechanisms to run what is on the agenda are invoked; such as
> RuleFlow).
> > So you could have rules in Group A cause Group B to receive the focus
> > but it is the RHS's execution order you control and not the pattern
> > matching - which will happen for Group A and Group B when facts are
> > inserted into WM.
> >
> > Look at Agenda Groups and RuleFlow. This should help.
> >
> > With kind regards,
> >
> > Mike
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Run-a-set-of-rules-in-a-group-B-from-a-rule-in-a-g
>
roup-A-tp21580767p21582595.html<http://www.nabble.com/Run-a-set-of-rul...
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> 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
>
--
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JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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8:05 a.m.
New subject: Run a set of rules in a group B from a rule in agroup A
Hello,
But I see that even if I put the focus to a group, he will inevitably
execute rules that doesn't have a group, it's normal?
Thanks :-)
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8:33 a.m.
New subject: Run a set of rules in a group B from a rule inagroup A
Rules that are not in any explicit user-defined Agenda Group belong
implicitly to the MAIN Agenda Group which is the last Agenda Group to
trigger activations when all others have completed. Provided ALL of your
rules belong to an explicit Agenda Group you should be able to
setFocus(...) to Group A on the WM before fireAllRules() which would
then setFocus(...) to Group B in the RHS causing this other group to
activate. As no rules are in MAIN then they will not activate by
default. Have a read about Agenda Groups in the docs. Last time I looked
in the source I believe this is how RuleFlow is (was) implemented.
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Thierry B
Sent: 21 January 2009 14:05
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Run a set of rules in a group B from a rule
inagroup A
Hello,
But I see that even if I put the focus to a group, he will inevitably
execute rules that doesn't have a group, it's normal?
Thanks :-)
--
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roup-A-tp21580767p21583764.html
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7:25 a.m.
New subject: Run a set of rules in a group B from a rule in agroup A
Hello,
When you said "Wrong. The rules won't be executed (read as activations -
RHS -
won't be run) but you can't stop the LHS being evaluated.", I don't
understand : if we use fireAllRules(), those rules will be executed
inevitably no?
I don't understand how we can decide that those rules (from a certain group)
won't be executed.
Thanks :-)
Anstis, Michael (M.) wrote:
Hi,
See below.
"executing a rule" is really two parts: LHS pattern matching (which
can't be stopped for a given RuleBase) and execution of the RHS (which
can be controlled by the agenda and truth maintenance).
I hope my time away hasn't led to me giving wrong advice.
Mike
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Thierry B
Sent: 21 January 2009 12:53
To: rules-users(a)lists.jboss.org
Subject: RE: [rules-users] Run a set of rules in a group B from a rule
in agroup A
Hello,
So if I've well understand :
- before calling fireAllRules(), Drools know for all rules (from any
group)
definied in DRL files, those which all patterns in the LHS of a rule are
matched, and those rules are placed on a agenda.
At which moment exactly, Drools verified from a rule that all of its
pattern
in the LHS are matched, if it's before callling fireAllRules() ?
>>> Yes, LHS is evaluated on workingMemory.insert(o). A call to
fireAllRules() executes the activations on the agenda (i.e. RHS queued
as a consequence of LHS being matched on workingMemory.insert(o)).
- And fireAllRules() permit to execute all rules that are placed on
agenda
>>> Yes
- When using setFocus() from a java class or a rule, we can control the
order of rules to specify to execute rules from group B, and group C...
>> I believe so.
- So it's not possible to tell Drools that we don't want to execute a
group
of rules if a rule A is not matched : in that group of rules : those
which
all paterns match LHS will be inevitably executed.
>>> Wrong. The rules won't be executed (read as activations - RHS -
won't be run) but you can't stop the LHS being evaluated.
All these points that I said, are exact?
Thanks :-)
Anstis, Michael (M.) wrote:
>
> Please accept that my knowledge is based on 4.x and there might be
other
> alternatives in 5.
>
> Rules are not "ran" but their patterns (LHS) evaluated as facts
> (objects) are inserted into Working Memory. When all patterns in the
LHS
> of a rule are matched activations are placed on the agenda for
execution
> of the consequence (RHS) when fireAllRules() is called (or other
> mechanisms to run what is on the agenda are invoked; such as
RuleFlow).
> So you could have rules in Group A cause Group B to receive the focus
> but it is the RHS's execution order you control and not the pattern
> matching - which will happen for Group A and Group B when facts are
> inserted into WM.
>
> Look at Agenda Groups and RuleFlow. This should help.
>
> With kind regards,
>
> Mike
>
>
--
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roup-A-tp21580767p21582595.html
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5838
days inactive
5838
days old
8 comments
3 participants
participants (3)
-
Anstis, Michael (M.) -
Edson Tirelli -
Thierry B