12:16 p.m.
Hi,
I've got a simple question.
How can I get generated facts out of the memory (for publishing them
using JMS)?
Thanks :)
Tina
12:46 p.m.
The usual method:
You establish a TopicPublisher as a global declared in your .drl file.
global TopicPublisher topicPublisher
You must set this from Java code using
TopicPublisher topicPublisher = ...;
statefulKnowledgeSession.setGlobal( "publisher", topicPublisher )
and then you use it in any RHS code.
Of course, a TopicPublisher could also be (field of) some fact,
but this shouldn't be necessary for such a central service.
-W
On 29 August 2010 19:16, Tina Vießmann <tviessmann(a)stud.hs-bremen.de> wrote:
Hi,
I've got a simple question.
How can I get generated facts out of the memory (for publishing them
using JMS)?
Thanks :)
Tina
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rules-users(a)lists.jboss.org
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2:24 p.m.
Thank you, Wolfgang! :)
Let's say:
I'm generating StatusMessage objects during the rule processing. They
will be published. But they are also need for further processing (so
they can not be deleted after publishing).
The StatusMessage objects defined as simple POJOs.
If I'm publishing the StatusMessage objects using a rule like
rule 'publish StatusMessages'
when
$msg : StatusMessage( )
then
// publish
end
In this case every StatusMessage would be send again and again.
My first impression for a solution would be to define a Boolean field
'send' that signals if the object has been send. But the field would
just be needed for Drools internal processing. So I thought of defining
this additional field using the declare statement. But if I remember
correctly from previous tries, such a things are not possible because
the declare statement with the additional field is the definition of a
new type... Am I right so far?
Do you have a idea how I can solve my problem of sending an fact/event
just once but keep it in the memory for further processing?
Thank sou!
Tina
The usual method:
You establish a TopicPublisher as a global declared in your .drl file.
global TopicPublisher topicPublisher
You must set this from Java code using
TopicPublisher topicPublisher = ...;
statefulKnowledgeSession.setGlobal( "publisher", topicPublisher )
and then you use it in any RHS code.
Of course, a TopicPublisher could also be (field of) some fact,
but this shouldn't be necessary for such a central service.
-W
On 29 August 2010 19:16, Tina Vießmann <tviessmann(a)stud.hs-bremen.de
<mailto:tviessmann@stud.hs-bremen.de>> wrote:
Hi,
I've got a simple question.
How can I get generated facts out of the memory (for publishing them
using JMS)?
Thanks :)
Tina
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rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
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7:35 p.m.
Try:
// this is type of control fact
declare MsgSent
msg : StatusMessage
end
rule publish
when
$msg : StatusMessage( )
not MsgSent( msg == $msg )
then
// publish
insert( new MsgSent( $msg ) ); // using 5.1.1, otherwise needs to use
empty constructor and set the field
end
rule cleanup
when
$snt : MsgSent( )
not StatusMessage( this == $snt.msg )
then
retract( $snt );
end
Edson
2010/8/29 Tina Vießmann <tviessmann(a)stud.hs-bremen.de>
Thank you, Wolfgang! :)
Let's say:
I'm generating StatusMessage objects during the rule processing. They will
be published. But they are also need for further processing (so they can not
be deleted after publishing).
The StatusMessage objects defined as simple POJOs.
If I'm publishing the StatusMessage objects using a rule like
rule 'publish StatusMessages'
when
$msg : StatusMessage( )
then
// publish
end
In this case every StatusMessage would be send again and again.
My first impression for a solution would be to define a Boolean field
'send' that signals if the object has been send. But the field would just be
needed for Drools internal processing. So I thought of defining this
additional field using the declare statement. But if I remember correctly
from previous tries, such a things are not possible because the declare
statement with the additional field is the definition of a new type... Am I
right so far?
Do you have a idea how I can solve my problem of sending an fact/event just
once but keep it in the memory for further processing?
Thank sou!
Tina
The usual method:
You establish a TopicPublisher as a global declared in your .drl file.
global TopicPublisher topicPublisher
You must set this from Java code using
TopicPublisher topicPublisher = ...;
statefulKnowledgeSession.setGlobal( "publisher", topicPublisher )
and then you use it in any RHS code.
Of course, a TopicPublisher could also be (field of) some fact,
but this shouldn't be necessary for such a central service.
-W
On 29 August 2010 19:16, Tina Vießmann <tviessmann(a)stud.hs-bremen.de>wrote:
> Hi,
>
> I've got a simple question.
>
> How can I get generated facts out of the memory (for publishing them
> using JMS)?
>
> Thanks :)
> Tina
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
_______________________________________________
rules-users mailing
listrules-users@lists.jboss.orghttps://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
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--
Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
2:04 a.m.
2010/8/29 Tina Vießmann <tviessmann(a)stud.hs-bremen.de>
Thank you, Wolfgang! :)
Let's say:
I'm generating StatusMessage objects during the rule processing. They will
be published. But they are also need for further processing (so they can not
be deleted after publishing).
The StatusMessage objects defined as simple POJOs.
If I'm publishing the StatusMessage objects using a rule like
rule 'publish StatusMessages'
when
$msg : StatusMessage( )
then
// publish
end
In this case every StatusMessage would be send again and again.
No, unless //publish modifies/updates $msg. Even if you'd need to change the
POJO, you can do so without notifying the Engine.
-W
My first impression for a solution would be to define a Boolean
field
'send' that signals if the object has been send. But the field would just be
needed for Drools internal processing. So I thought of defining this
additional field using the declare statement. But if I remember correctly
from previous tries, such a things are not possible because the declare
statement with the additional field is the definition of a new type... Am I
right so far?
Do you have a idea how I can solve my problem of sending an fact/event just
once but keep it in the memory for further processing?
Thank sou!
Tina
The usual method:
You establish a TopicPublisher as a global declared in your .drl file.
global TopicPublisher topicPublisher
You must set this from Java code using
TopicPublisher topicPublisher = ...;
statefulKnowledgeSession.setGlobal( "publisher", topicPublisher )
and then you use it in any RHS code.
Of course, a TopicPublisher could also be (field of) some fact,
but this shouldn't be necessary for such a central service.
-W
On 29 August 2010 19:16, Tina Vießmann <tviessmann(a)stud.hs-bremen.de>wrote:
> Hi,
>
> I've got a simple question.
>
> How can I get generated facts out of the memory (for publishing them
> using JMS)?
>
> Thanks :)
> Tina
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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rules-users mailing
listrules-users@lists.jboss.orghttps://lists.jboss.org/mailman/listinfo/rules-users
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4 comments
3 participants
participants (3)
-
Edson Tirelli -
Tina Vießmann -
Wolfgang Laun