Upgrade to Drools 5 - loss of performance
by Scott Reed
I just upgraded our app from Drools 4 to 5 libraries. We just use the
rules engine with DRL. The performance of the engine on our rulebase is
unacceptably slow. I assume there is something we need to do to our
rules or the way we are configuring the engine to fix this. I don't see
anything in the release notes about backwards compatibility issues. I
would very much appreciate it if someone would direct me to any
documentation that explains what needs to be done so our 4.0 rules
perform at least as well as they did before the upgrade?
Thanks,
Scott
16 years, 2 months
drl to pkg
by Perumaal Krishnaraj
Hello Everybody,
I'm a newbie to Drools, so please excuse me, if question is very
fundamental.
I'm not using drools with eclipse or brms.
I would like to convert the drl file which I had created using a text editor
to the binary form ie. in pkg format (serialized), which can be used im my
Java application.
Is there a tool, or a code snippet which gives me an idea as to how this is
done.
Regards,
kp
16 years, 2 months
functions
by Chris Richmond
Ok.I am trying to build a function library in my .drl file and I added this
one test function
function String outputString(String sData){
return sData;
}
And no matter where I place this in my .drl file, I get an exception one way
or the other with compiling when I try instaniate and fire my rules. The
.drl file works exactly as expected if I remove this function declaration,
and when I *do* try to add it, I do not actually call it anywhere.but get
those errors.
So my question is, where exactly do I need to place function declarations..
Thanks,
Chris
16 years, 2 months
Re: [rules-users] Need help related to collection of data accessing in rule file.
by prasad raju sagi
Hi ,
I am trying to create rule on a fact , which contains arraylist of collection and the object in the collection internally contains an arraylist of another collection of objects.
This looks like object A contains collection of objects B and B contains collection object C
A -> blist ( Arraylist<B> )
B -> clist (ArrayList<C> )
C-> dlist( ArrayList<D>)
D-> type ( string)
I am inseting A as fact to the working memory.
I am in confusion state like how to write the rule to place conditions on collection C.
Can I use from in the form of nested from in rule statment.
Thanks
Prasad Raju Sagi
Mobile: 847-644-4103
________________________________
From: Aziz Boxwala <boxwala(a)yahoo.com>
To: rules-users(a)lists.jboss.org
Sent: Thursday, June 11, 2009 1:58:28 PM
Subject: [rules-users] process order example not working fully
I am trying to execute a ruleflow and use rules to assign tasks within the ruleflow in Drools 5.0.1. I have a drl file included in my knowledge base that tries to assign a task to a user when a new human task is created. This is based on the example in org.drools.example.process.order. I can't get my code to work. I don't the rules in the example are working either (dslr for the task assignment or the drl for dynamic logging). After some attempts, I found that this condition
WorkItemNodeInstance()
does not evaluate to true ever.
Do I have to do anything special to make the WorkItemNodeInstance appear in working memory?
Thanks for any help.
--Aziz
16 years, 3 months
Flow (human task) and web apps
by Rodrigo
Just a newbie question...
To use drools flow with human tasks in a Seam application for example, i
will need to start a mina server in another thread (and interact by a mina
client), like documentation suggest?
Anyone have a sample web app that use this approach, drools flow + human
task + webapps.
Thanks in advance.
Rodrigo Valério.
16 years, 3 months
Re: [rules-users] unable to determine value type class *** URGENT***
by Corneil du Plessis
Srithu wrote:
>
> I have a wired behavior..
>
> I have a set of rules and i have used drools-guvnor to packaging them...
> It is working in windows machines where i have jboss which is running on
> IBM java 5 and 6..
>
> When i connect the same from jboss Which is running on 64 bit IBM java 6
> on linux is not working...
> The same is working If i used 64 bit IBM java 5 on linux.....
>
>
> I getting following exception...
>
>
>
> Please help....
>
>>> [2009-02-11 12:30:29,697] [705980] [http-0.0.0.0-8080-12] [ERROR]
>>> [STDERR ] - org.drools.RuntimeDroolsException: unable to determine
>>> ValueType for Class [class java.lang.Object]
>
>>> [2009-02-11 12:30:29,698] [705981] [http-0.0.0.0-8080-12] [ERROR]
>>> [STDERR ] - at
>>> org.drools.base.ValueType.determineValueType(ValueType.java:193)
>
>>> [2009-02-11 12:30:29,698] [705981] [http-0.0.0.0-8080-12] [ERROR]
>>> [STDERR ] - at
>>> org.drools.base.ValueType.readResolve(ValueType.java:125)
>
>>> [2009-02-11 12:30:29,698] [705981] [http-0.0.0.0-8080-12] [ERROR]
>>> [STDERR ] - at
>>> sun.reflect.GeneratedMethodAccessor121.invoke(Unknown Source)
>
>>> [2009 -02-11 12:30:29,698] [705981] [http-0.0.0.0-8080-12]
>>> [ERROR] [STDERR ] - at
>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
>
>>> [2009-02-11 12:30:29,698] [705981] [http-0.0.0.0-8080-12] [ERROR]
>>> [STDERR ] - at java.lang.reflect.Method.invoke(Method.java:599)
>
> [deleted stacktrace]
>
>
We are experiencing same issue on WebSphere 6.1 FP 23 on Linux and AIX.
Has anyone found a resolution?
Regards
Corneil
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16 years, 5 months
Conversion from Normal Decision Tables to Web-Based Tables and vice-versa
by Vikrant Yagnick
Hi All,
I am wondering if anyone has had a requirement where they would need to convert their normal decision tables into web-based decision tables(or vice-versa).
If someone has already done this, can they share either some code or pointers to how this can be done? (I guess it will involving parsing the Excel and creating the XML for the decision table).
Will this be a useful feature to have?
Cheers,
Vikrant
MASTEK LTD.
Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List.
In the US, we're called MAJESCOMASTEK
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16 years, 5 months
"extends" in rules
by Chandana Pingle
Hi,
I found an example on using "extends" to extend a rule from another rule.
Using extends would only include the WHEN side of the rule.
I want to use the variable defined in the parent rule in sub rule
,something like below example,how do i do that?
rule A
when
$a:String( )
eval($a=="abc")
then
do something
end
rule B extends A
when
$b:String( )
$c:SomeClass()
then
$c.someMethod($a,$b) //i am not able to use $a here
end
Any suggestions?
Thanks
Chandana
16 years, 5 months
loading rules dynamically
by techy
Hi,
If the rules,conditions,consequences have to loaded from the database. I
can think of following two approach. what would be right approach( I will
have upto 1200 rules in the db)
1. Programmatically inject the rules into rule engine using drools API.
2. Read the rules from the database and create drl or dsl file for them and
inject into rule engine.
Thanks
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16 years, 5 months
Drools and Eclipse 3.5
by J Michael Dean
Sorry because I am sure this has been answered, but cannot find.
Compelling reasons to switch to Eclipse 3.5 because of recent changes
to Mac OSX but documentation pretty clearly indicates 3.4 for Drools
5.0. Is Drools 5.0 compatible with Eclipse 3.5?
- Mike
16 years, 6 months
