10:37 a.m.
Thanks for your fast response Kris and Michal!
I tried to use your solution Kris, but I've found that 5.0.0 M5
WorkflowProcessInstance does not seems to provide getVariable method. I've
found that method into WorkflowProcessInstanceImpl searching in svn trunk. I
must work with that class or I missed something? Thanks again!
Ricardo.
---------- Mensaje reenviado ----------
From: Kris Verlaenen <Kris.Verlaenen(a)cs.kuleuven.be>
To: Rules Users List <rules-users(a)lists.jboss.org>
Date: Sun, 8 Mar 2009 03:56:29 +0100
Subject: Re: [rules-users] Drools Flow, constraint parametrization
Ricardo,
If you need to access process variables and have only simple constraint
expressions, I suggest you use code constraints (Java or MVEL dialect),
as they have direct access to variables (and globals).
If you want to use rule constraints anyway (because your constraints can
become rather complex), there are a few options:
- You cannot use globals to pass information used in your constraints,
because globals are considered immutable with respect to rule conditions
- You can put your data you want to access in your working memory.
Rule constraints can then access this info just like any normal rule.
- You access the variable value using the special "processInstance"
rule constraint (I just added a new section in the documentation to
explain):
Rule constraints do not have direct access to variables defined inside
the process. It is however possible to refer to the current process
instance inside a rule constraint, by adding the process instance to the
working memory and matching to the process instance inside your rule
constraint. We have added special logic to make sure that a variable
"processInstance" of type WorkflowProcessInstance will only match to the
current process instance and not to other process instances in the
working memory. Note that you are however responsible yourself to insert
(and possibly update) the process instance into the session (for example
using Java code or an (on-entry or on-exit or explicit) action in your
process). The following exampleof a rule constraint will search for a
person with the same name as the value stored in the variable "name" of
the process:
processInstance: WorkflowProcessInstance()
Person( name == ( processInstance.getVariable("name") ) )
# add more constraints here ...
Kris
Quoting Ricardo Gil Alcañiz <rgil(a)okode.com>:
> Hi,
>
> I'm not a new drools user but I started to test rule flows (5.0M5)
> recently
> and I'm stucked, so any clue will be welcomed :). I'm testing how to
> share a
> StatefulKnowledgeSession between N rule flow instances. I'm trying
> to
> parametrize each instance with process variables at start time but I
> don't
> know how to use them from rule constraints (in event waits, splits,
> etc.).
> I've read the documentation and I've found this text related to
> constraints
> "Both rule and code constraints have access to globals that are
> defined for
> the process and can reuse imports at the process level." I tried it
> assigning (from an action) a variable value to a global variable but
> it's
> not working for me. ¿I'm missing something?
>
> Thanks in advance!
>
> Ricardo.
>
11:03 a.m.
New subject: rules-users Digest, Vol 28, Issue 19
Ricardo,
This method has recently been added into WorkflowProcessInstance, it is on trunk and will
be in CR1. For M5, you could indeed use WorkflowProcessInstanceImpl ...
Kris
----- Original Message -----
From: Ricardo Gil Alcañiz
To: Rules Users List
Sent: Monday, March 09, 2009 4:37 PM
Subject: [rules-users] Re: rules-users Digest, Vol 28, Issue 19
Thanks for your fast response Kris and Michal!
I tried to use your solution Kris, but I've found that 5.0.0 M5
WorkflowProcessInstance does not seems to provide getVariable method. I've found that
method into WorkflowProcessInstanceImpl searching in svn trunk. I must work with that
class or I missed something? Thanks again!
Ricardo.
---------- Mensaje reenviado ----------
From: Kris Verlaenen <Kris.Verlaenen(a)cs.kuleuven.be>
To: Rules Users List <rules-users(a)lists.jboss.org>
Date: Sun, 8 Mar 2009 03:56:29 +0100
Subject: Re: [rules-users] Drools Flow, constraint parametrization
Ricardo,
If you need to access process variables and have only simple constraint
expressions, I suggest you use code constraints (Java or MVEL dialect),
as they have direct access to variables (and globals).
If you want to use rule constraints anyway (because your constraints can
become rather complex), there are a few options:
- You cannot use globals to pass information used in your constraints,
because globals are considered immutable with respect to rule conditions
- You can put your data you want to access in your working memory.
Rule constraints can then access this info just like any normal rule.
- You access the variable value using the special "processInstance"
rule constraint (I just added a new section in the documentation to
explain):
Rule constraints do not have direct access to variables defined inside
the process. It is however possible to refer to the current process
instance inside a rule constraint, by adding the process instance to the
working memory and matching to the process instance inside your rule
constraint. We have added special logic to make sure that a variable
"processInstance" of type WorkflowProcessInstance will only match to the
current process instance and not to other process instances in the
working memory. Note that you are however responsible yourself to insert
(and possibly update) the process instance into the session (for example
using Java code or an (on-entry or on-exit or explicit) action in your
process). The following exampleof a rule constraint will search for a
person with the same name as the value stored in the variable "name" of
the process:
processInstance: WorkflowProcessInstance()
Person( name == ( processInstance.getVariable("name") ) )
# add more constraints here ...
Kris
Quoting Ricardo Gil Alcañiz <rgil(a)okode.com>:
Hi,
I'm not a new drools user but I started to test rule flows (5.0M5)
recently
and I'm stucked, so any clue will be welcomed :). I'm testing how to
share a
StatefulKnowledgeSession between N rule flow instances. I'm trying
to
parametrize each instance with process variables at start time but I
don't
know how to use them from rule constraints (in event waits, splits,
etc.).
I've read the documentation and I've found this text related to
constraints
"Both rule and code constraints have access to globals that are
defined for
the process and can reuse imports at the process level." I tried it
assigning (from an action) a variable value to a global variable but
it's
not working for me. ¿I'm missing something?
Thanks in advance!
Ricardo.
------------------------------------------------------------------------------
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rules-users(a)lists.jboss.org
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9:52 a.m.
New subject: rules-users Digest, Vol 28, Issue 19
Thanks for the explanation!
I've found the CR1 downloads, I've just tried it, and it works just as I
needed :).
Just one comment. In my first attempts I missed your comment about using a
variable with the specific name "processInstance"... I'm "slower"
than I
thought... But, just as a suggestion, it may be better to have a clearer way
to use this special matching. Maybe using a fact property or a keyword... ?
Well, I don't know anything about the ruleflow project and its complexity so
take my suggestion as it is :).
Well, thanks again for the help and congratulations for your impressive
work!
Ricardo.
2009/3/9 Kris Verlaenen <kris.verlaenen(a)cs.kuleuven.be>
Ricardo,
This method has recently been added into WorkflowProcessInstance, it is on
trunk and will be in CR1. For M5, you could indeed use
WorkflowProcessInstanceImpl ...
Kris
----- Original Message -----
*From:* Ricardo Gil Alcañiz <rgil(a)okode.com>
*To:* Rules Users List <rules-users(a)lists.jboss.org>
*Sent:* Monday, March 09, 2009 4:37 PM
*Subject:* [rules-users] Re: rules-users Digest, Vol 28, Issue 19
Thanks for your fast response Kris and Michal!
I tried to use your solution Kris, but I've found that 5.0.0 M5
WorkflowProcessInstance does not seems to provide getVariable method. I've
found that method into WorkflowProcessInstanceImpl searching in svn trunk. I
must work with that class or I missed something? Thanks again!
Ricardo.
> ---------- Mensaje reenviado ----------
> From: Kris Verlaenen <Kris.Verlaenen(a)cs.kuleuven.be>
> To: Rules Users List <rules-users(a)lists.jboss.org>
> Date: Sun, 8 Mar 2009 03:56:29 +0100
> Subject: Re: [rules-users] Drools Flow, constraint parametrization
> Ricardo,
>
> If you need to access process variables and have only simple constraint
> expressions, I suggest you use code constraints (Java or MVEL dialect),
> as they have direct access to variables (and globals).
>
> If you want to use rule constraints anyway (because your constraints can
> become rather complex), there are a few options:
>
> - You cannot use globals to pass information used in your constraints,
> because globals are considered immutable with respect to rule conditions
>
> - You can put your data you want to access in your working memory.
> Rule constraints can then access this info just like any normal rule.
>
> - You access the variable value using the special "processInstance"
> rule constraint (I just added a new section in the documentation to
> explain):
>
> Rule constraints do not have direct access to variables defined inside
> the process. It is however possible to refer to the current process
> instance inside a rule constraint, by adding the process instance to the
> working memory and matching to the process instance inside your rule
> constraint. We have added special logic to make sure that a variable
> "processInstance" of type WorkflowProcessInstance will only match to the
> current process instance and not to other process instances in the
> working memory. Note that you are however responsible yourself to insert
> (and possibly update) the process instance into the session (for example
> using Java code or an (on-entry or on-exit or explicit) action in your
> process). The following exampleof a rule constraint will search for a
> person with the same name as the value stored in the variable "name" of
> the process:
>
> processInstance: WorkflowProcessInstance()
> Person( name == ( processInstance.getVariable("name") ) )
> # add more constraints here ...
>
> Kris
>
> Quoting Ricardo Gil Alcañiz <rgil(a)okode.com>:
>
> > Hi,
> >
> > I'm not a new drools user but I started to test rule flows (5.0M5)
> > recently
> > and I'm stucked, so any clue will be welcomed :). I'm testing how to
> > share a
> > StatefulKnowledgeSession between N rule flow instances. I'm trying
> > to
> > parametrize each instance with process variables at start time but I
> > don't
> > know how to use them from rule constraints (in event waits, splits,
> > etc.).
> > I've read the documentation and I've found this text related to
> > constraints
> > "Both rule and code constraints have access to globals that are
> > defined for
> > the process and can reuse imports at the process level." I tried it
> > assigning (from an action) a variable value to a global variable but
> > it's
> > not working for me. ¿I'm missing something?
> >
> > Thanks in advance!
> >
> > Ricardo.
> >
>
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