Use of function in Drools Test Scenario
by Abbo
Hi,
I am a newbie on Drools, don't mind me asking stupid questions :)
W've started using Drools, first in a Proof-Of-Concept mode for a large
scale project in which we have developers and analysts using Drools. As an
analyst I defined the Rules and Test Scenarios in Guvnor. The developer has
added some functions too in the Repository in the same package as my Rules
and Test Scenarios are. So far so good. However, I encounter problems when
using the functions in my Test Scenario. I receive a:
[Error: no such method or function: timeStringToLong] [Near : {... new
java.util.Date(), "17:00" ....}] ^ [Line: 1, Column: 0]
The first part of the Test Scenario looks like:
GIVEN
insert [Segment] [$seg]
arrivalTime: =timeStringToLong(new java.util.Date(), "17:00")
If I use eval() around the function call or prefix it with the package name
it does not help.
So all this leads to the questions:
- is it possible to use function calls in Test Scenarios?
- what is the format to call functions?
- is there somewhere documentation about input values, formats, etc.
- do I have the fully qualify the Date parameter?
Thanks very much!
Abbo
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15 years, 1 month
Some doubts on Guvnor
by Diego Martins
Hello!
So, let'me explain what is happening first...
I'm developing a project based on seam 2.2.0, and we used to have guvnor
(5.0.1) working perfectly. So, suddenly I decided it was time to move on and
start using the newest version (5.1.1, i guess). Made a backup of the older
version, configured the newer guvnor and deployed it. But I didn't know
Guvnor 5.1.1 had this need to authenticate in order to retrieve the binary
packages, which causes some trouble with seam 2.2.0, since I can't configure
username and password on my rules.properties, making it impossible to
integrate them.
Then I decided to move back to my good old guvnor 5.0.1, but as I tried to
deploy, malign forces started acting and, what worked perfectly before, no
longer works. This is the exception: http://pastebin.com/VUWxJyLD
(BTW, I'm using tomcat 6)
So, nothing changed, but suddenly Guvnor 5.0.1 no longer deploys.
I tried to find this version on Jboss Drools website, without success. Looks
like the only version available is the newest.
So, I came to you kindly asking for urgent help... It could be on how to fix
this exception and make my backup deployable again, or on how to get older
versions of Guvnor (preferably 5.0.1).
Thanks already!
Diego Martins
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15 years, 1 month
Use of DroolsManagementAgentMBean
by asutosh_pandya
Hello all,
I need to grab all the information/statistics after firing all the rules. It
is observed that the same can be achieved by different event listeners in
drools. But I don't want to use listeners, instead I need all the
information after firing all the rules. Going through the Drools API, I came
across an interface DroolsManagementAgentMBean which can provide the above
information. I tried to google out the way we need to implement this
interface but in vain.
can any one please let me know how can I achieve the above without using
listeners and at the same time how can I use DroolsManagementAgentMBean?
Thanks in advance,
Asutosh
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15 years, 1 month
Why Using "from" Always Return A New Fact?
by hyjshanghai
I am trying to understand why care should be taken to use "from" and
"lock-on-active" together, as is described in "Section 4.8.3.8. Conditional
Element from" of
http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/ht...
the Drools Reference Document .
It says "the use of from returns a new fact for all intents and purposes
each time it is evaluated." Why is it true?
Below is the full related-text copied from the Drools Reference Document for
your reference:
=== BEGIN ===
You must take caution, however, when using from, especially in conjunction
with the lock-on-active rule attribute as it may produce unexpected results.
Consider the example provided earlier, but now slightly modified as follows:
rule "Assign people in North Carolina (NC) to sales region 1"
ruleflow-group "test"
lock-on-active true
when
$p : Person( )
$a : Address( state == "NC") from $p.address
then
modify ($p) {} #Assign person to sales region 1 in a modify block
end
rule "Apply a discount to people in the city of Raleigh"
ruleflow-group "test"
lock-on-active true
when
$p : Person( )
$a : Address( city == "Raleigh") from $p.address
then
modify ($p) {} #Apply discount to person in a modify block
end
In the above example, persons in Raleigh, NC should be assigned to sales
region 1 and receive a discount; i.e., you would expect both rules to
activate and fire. Instead you will find that only the second rule fires.
If you were to turn on the audit log, you would also see that when the
second rule fires, it deactivates the first rule. Since the rule attribute
lock-on-active prevents a rule from creating new activations when a set of
facts change, the first rule fails to reactivate. Though the set of facts
have not changed, the use of from returns a new fact for all intents and
purposes each time it is evaluated.
=== END ===
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15 years, 1 month
Re: [rules-users] Drools Release 5.2
by Rob Fisher
Mark
Any chance you have an ETA for 5.2?
Thanks
Rob
Date: Thu, 20 Jan 2011 06:18:24 -0800 (PST)
From: alim <audrey.lim(a)it-vision.com>
Subject: [rules-users] Drools Release 5.2
To: rules-users(a)lists.jboss.org
Message-ID: <1295533104306-2294771.post(a)n3.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi,
I was wondering if there's already a planned release date for Drools
Version
5.2?
Kindest regards,
Audrey
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------------------------------
Message: 4
Date: Thu, 20 Jan 2011 14:39:38 +0000
From: Mark Proctor <mproctor(a)codehaus.org>
Subject: Re: [rules-users] Drools Release 5.2
To: rules-users(a)lists.jboss.org
Message-ID: <4D38492A.2020206(a)codehaus.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 20/01/2011 14:18, alim wrote:
> Hi,
>
> I was wondering if there's already a planned release date for Drools
Version
> 5.2?
no planned date yet.
We are currently moving Guvnor of extjs, which is about 80% done. When
that is done we'll look at pushing out a release.
Mark
> Kindest regards,
> Audrey
15 years, 1 month
Drools with Hibernate, with dynamic types
by Gabor Szokoli
Hi,
I'm gathering the requirements for an odd system project, and I have a
design idea that is centered around Drools. I'd like to hear everyones
opinion.
The project is in a really early stage of conceptual analysis, and I'm
also near the start on the winding road exploring Drools.
The requirements call for a generic service application that performs
database operations in response to service requests.
Service logic should be editable by domain experts, not programmers.
(Enter Drools Flow due to the procedural nature of the domain logic.)
Trouble is, the exact database schema, thus the entity types are not
known at compile time, only at the time of deployment. (In fact may
differ across deployments.)
So here's the idea:
At deployment time I can convert the local database schema and domain
logic description into both Drools rules/processes with type
definitions, and matching hibernate/ibatis/JPA mappings for the java
types defined via Drools.
Drools would do the runtime bytecode generation for the entities and
request objects its rules/process steps will operate on at deployment
time.
Then the ORM can instantiate the object network of entities from the
database. (a few thousand entities, not a real big database.)
All entities are inserted as facts in a forever-running session.*
At each service request, the service connector would use reflection to
create and populate a request object, and trigger a short-lived Drools
Process.
The user defined logic is executed, and if all went well, entity state
is persisted back into the database for Durability.
Servicing the requests sequentially is acceptable, so I'm not thinking
about concurrency and Isolation yet.
(I can always throw more worker threads at the problem with separate
Working Memories, coupled by the L2 cache of the ORM I guess.)
*: It's of course not critical for the KnowledgeSession to live
forever: The working memory can be re-created from the database at any
time.
Does this sound doable? Is there any obvious flaw you guys can spot
right away maybe?
The alternative would be reading the database contents into Maps
instead of typed entities with dynamically generated types, but that
would drain all the elegance out of the Drools rules:
when
$p = PalpusztaiCheese(smell>11)
then
modify($p) { setQA("pass"); }
end
becomes
when
$m = Map()
eval( "PalpusztaiChese".equals($m.get("type")) )
eval((Integer)$m.get("smell") > 11 )
then
modify($m) { set("QA","pass"); }
end
(A DSL could completely hide this difference though, couldn't it?)
Thanks for any ideas!
Gabor Szokoli
15 years, 1 month
Drools repository and accessing the rules engine from vb.net
by Gorantla, Bhaskar (GE Capital)
I would appreciate if you could please answer the following questions.
1. Can you share some information on the out of the box repository? Is
it a relational database or is it an embedded database such as Berkley DB?
2. Can we make Guvnor to store the rules in an Oracle database?
3. Ways in .net application can access the rules engine to execute the
rules
Thanks
Bhaskar
15 years, 1 month
Salience
by huionn
If I have a rule like below:
rule "#1"
when
$i : Item(type == 1)
then
retract ($i)
// do something...
end
rule "#2"
when
$i : Item(type == 2)
then
retract ($i)
// do something...
end
// to handle other type of Item
rule "#catch-all"
salience -10
when
$i : Item()
then
retract ($i)
// do something...
end
As it is known, reliance on salience is bad practice and its order is not
guaranteed (as shown in Sudoku example).
My question is: what is the simple and good practice to emulate "else" (rule
"#catch-all") without reliance on salience? It seems ruleflow is not
applicable here as well.
Thanks and best regards.
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15 years, 1 month
Need clarification in dslr conversion
by Bala
Hi,
Please find the below sample dsl and dslr, in which only the keyword part is
alone getting converted in dslr. condition scope is not getting converted
when i look at the generated drl file. But when i change the scope from
condition to keyword, its getting converted.. am i missing something...
eg: [condition][]Get a Customer=$Customer : CustomerInfoType() is not
getting converted..
sample DSL
**********
[keyword][][Ii][fF]=when
[keyword][]Start Rule {ruleName}=rule {ruleName}
[keyword][]Template Header=template header
[keyword][]Start Template : "{tamplateName}"=template "{tamplateName}"
[keyword][]Finish Template=end template
[keyword][]FieldName {field}={field}
[keyword][]Start template Rule"{ruleName}"=rule
"{ruleName}__(a){row.rowNumber}"
[keyword][]Finish Rule=end
[keyword][][Aa]dd [Rr]ule [Ii]nfo :
{attribute}("{value}")=@{attribute}("{value}")
[condition][]1st=1
[condition][]2nd=2
[condition][]3rd=3
[condition][]Get a Customer=$Customer : CustomerInfoType()
[condition][]-with {fieldName} as {value}=${fieldName} : {fieldName},
{fieldName}=={value}
sample dslr
**********
expander pricingRules.dsl
Start Rule "AutoRatingDemo"
Add Rule Info : subRuleName("test")
Add Rule Info : author("Vishal Kaushik")
Add Rule Info : DateOfCreation("19-Jan-2011")
when
Get a Customer
-with customerCode as "23470942810"
then
end
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15 years, 1 month
