Integrate drools into existing app
by Ian Spence
I have been asked to integrate Drools into an existing webapp. We are
thinking about using Spring (already implemented).
I have read in the Drools 4 documentation, the RuleAgent should be kept in a
Singleton or JNDI or similar.
i.e. from 4.0 docs
"IMPORTANT: You should only have one instance of the RuleAgent per rulebase
you are using. This means you should (for example) keep the agent in a
singleton, JNDI (or similar). In practice most people are using frameworks
like Seam or Spring - in which case they will take care of managing this for
you (in fact in Seam - it is already integrated - you can inject rulebases
into Seam components). Note that the RuleBase can be used multiple times by
multiple threads if needed (no need to have multiple copies of it)."
I have upgraded to Drools 5.0. Is the Singleton still required in 5.0 ? I
cannot see any mention of it there.
Has any had any experience with Drools 5.0 and Spring? Any advice?
--
Regards,
Ian Spence
17 years, 1 month
Download Drools 4.0.7
by Shenika Harris
Is it still possible to download 4.0.7?
We are in the process of getting approval to implement 4.0.7 in our one
of our applications. While 5.x is very appealing, it would be a
significant delay in the project to get approval for 5 at this time.
The links for 4.0.7 are 'gone' and making people very nervous.
Please let me know if you have the url to download 4.0.7... I suspect
it's something like http://download.jboss.org/drools/release/4.0.7 etc.
Thank you!
- Shenika
17 years, 2 months
RE: [rules-users] How to import DRL into Business Rule Assets section?
by Late Norther
> Hello,
> We are trying to develop a system based on Drools and want to have a
> repository based on JBoss and manage it from the Guvnor website. Now,
> we have a few questions:
> 1) Can we import DRL files into the Business rules section, so that
> later we can view/modify them using the graphical interface (text
> boxes, drop down menus, etc)? This will be very useful for production
> use.
> What we tried so far, imports them as text in the Technical rules
> section
I have the identical question. I have created a utility which takes
our own homegrown rules and converts them (hundreds of rules) into a
DRL file. I too have been able to import them into Guvnor, but was
hoping they could then be modified via the graphical editor instead of
the technical rule editor. The rules are simple and do not contain
anything that Guvnor's graphical editor does not support. I have a
feeling this is an enhancement request, but just in case anyone knew
of a workaround to change the type of rule from technical rule to
business rule.....
Thanks,
Jon
17 years, 2 months
can drools support complex rules
by Bhushan Bhangale
Hi,
I recently came across Drools. I gone through the documentation and the
examples provide are quite simple. I want to know if it can be really
applied to complex real world problems.
Take for example,
If a customer login within 5 minutes from two different locations, mark the
user invalid.
How can I write the above rule in drools? I have the data when the user last
logged in and the data of current login. You can say two objects.
May be my understanding is wrong but looks like based on rule I have to pass
all the required data. How can then at real time new rules can be added?
For example,
If the customer location is not on a list of valid locations, mark the user
invalid.
For the above rule I need to pass a list of valid locations as well.
Now how about "Customer login from more than 5 locations in the last one
month"?
Thanks
Mr. Bhangale Bhushan
Associate Manager
Kale Consultants Ltd.
<mailto:bhushan_bhangale@kaleconsultants.com>
bhushan_bhangale(a)kaleconsultants.com
tel:
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3777
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17 years, 2 months
Not able to build documentation from version 5.0 source
by dpointzero-drools＠yahoo.com.sg
Hi,
I am new to Drools and I am not able to build the documentation from the source code.
The versions of the various software I am using are as follows:
- Drools: 5.0.1.26597.FINAL.
- Maven: 2.1.0
- OS: Mac OS X 10.5.7 (on an Intel-Mac)
- Java: 1.5.0_16
The error messages I see when trying to build the documentation are as follows:
----------------------------------------------------------------------------------------------------------------
~/Developmen.../drools-5.0-src\>mvn -e -Ddocumentation clean package
+ Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='org.drools:docbook-style-drools'}' and 'Vertex{label='org.drools:docbook-style-drools'}' introduces to cycle in the graph org.drools:docbook-style-drools --> org.drools:docbook-style-drools
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.BuildFailureException: The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='org.drools:docbook-style-drools'}' and 'Vertex{label='org.drools:docbook-style-drools'}' introduces to cycle in the graph org.drools:docbook-style-drools --> org.drools:docbook-style-drools
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:323)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: hidden.org.codehaus.plexus.util.dag.CycleDetectedException: Edge between 'Vertex{label='org.drools:docbook-style-drools'}' and 'Vertex{label='org.drools:docbook-style-drools'}' introduces to cycle in the graph org.drools:docbook-style-drools --> org.drools:docbook-style-drools
at hidden.org.codehaus.plexus.util.dag.DAG.addEdge(DAG.java:127)
at hidden.org.codehaus.plexus.util.dag.DAG.addEdge(DAG.java:107)
at org.apache.maven.project.ProjectSorter.addEdgeWithParentCheck(ProjectSorter.java:351)
at org.apache.maven.project.ProjectSorter.<init>(ProjectSorter.java:161)
at org.apache.maven.execution.ReactorManager.<init>(ReactorManager.java:99)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:316)
... 10 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2 seconds
[INFO] Finished at: Tue May 19 17:48:42 EDT 2009
[INFO] Final Memory: 9M/247M
[INFO] ------------------------------------------------------------------------
~/Developmen.../drools-5.0-src\>
----------------------------------------------------------------------------------------------------------------
Any pointer is appreciated. Thanks!
regards,
Daniel
17 years, 2 months
rule with low Salience is fired too early
by David Boaz
Dear all,
First, let me inform that we are using stateless sessions in Drools 5 CR1.
In my application I have to compute a score and if the score is above a
threshold, an alert is created. The score is accumulated from many small
rules (actually, generated from excel using drools decision-tables).
Initially, many input objects and a Score object initialized to zero are
inserted. The form of my rules is:
1 rule “accumulate #1”
2 when
3 Input(....)
4 s:Score()
5 then
6 s.add(4) // 4 is just an example
7 end
8
9 rule “threshold”
10 when
11 Score(value>40)
12 then
13 Alert.create(..)
14 end
1.The Score object was actually accumulated as expected. But for some
reason, the “threshold” rule fired once when the score.value was still ==0.
2.I tried to set the salience of the “threshold” rule to -1 (low priority).
But it didn't affect the rule firing.
3.I suspected that the engine was not informed that the score object was
updated in the first rules. So, I added a call to drools.update(s) after
line 6. That solved the issue and the “threshold” rule actually fired. But
now, I noticed that several alerts were created because the score was set
several times to a value>40.
4.To solve that new issue, I set again the salience of the threshold rule to
-1. This time, only one alert was created.
My concern is that I don't understand what happened. Can someone please
explain?
To my understanding, the situation described in my second bullet should
work. Initially, all the inserted objects are checked in the RETE network
and an agenda is created. The activation for the “threshold” rule is the
last one. I don't see the reason how can the threshold rule fire before all
the accumulate rules were fired.
Thanks for the help, David
--
View this message in context: http://www.nabble.com/rule-with-low-Salience-is-fired-too-early-tp2358559...
Sent from the drools - user mailing list archive at Nabble.com.
17 years, 2 months
Rules Debugging
by Vikas Phonsa
Hi All,
I'm using Drools 4.0.7 with Java 1.4.
Some of my rules are throwing exceptions and my goal is to get a list of names of all rules that are being executed (till the point the exception is thrown).
I have tried doing
stateLesssession.addEventListener( new DebugAgendaEventListener() );
and it does give me a bunch of information about the agenda. But I want to narrow it down to the rules that are actually executed.
Which event it called right after the execution control goes inside a rule (before the 'when' condition is executed)?
Thanks,
Vikas
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17 years, 2 months
Re: [rules-users] Rules and Hibernate Question
by Greg Barton
Global is probably how I'd do it. Now, outside the rules you might want to get fancy, like IOC or a ThreadLocal, but inside a global is fine. (unless you're in multithreaded mode with a single hibernate session, which is bad because hibernate sessions are not thread safe.)
GreG
On May 15, 2009, at 14:54, Shannon Lal <shannonlal2909(a)gmail.com> wrote:
Thanks for the response. How would you recommend passing it in? Via the Global Memory or another way?
Shannon
On Fri, May 15, 2009 at 4:50 PM, Greg Barton <greg_barton(a)yahoo.com> wrote:
It depends on your transaction needs. A hibernate session can only encompass one db transaction. So if you need to execute more than one db transaction in one rule firing session, then pass in a hibernate SessionFactory to spawn multiple hibernate Sessions. Otherwise pass in a hibernate Session.
GreG
On May 15, 2009, at 11:42, Shannon Lal <shannonlal2909(a)gmail.com> wrote:
I have a question about using Hibernate with Rules. I am wondering if there is some standard practices on how one should reference the Hibernate Session inside a rule. Should this be passed in as a global variable? Is there a better way of doing this? Any advice on this would be greatly appreciated.
Thanks
Shannon
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17 years, 2 months
Re: [rules-users] Rules and Hibernate Question
by Greg Barton
It depends on your transaction needs. A hibernate session can only encompass one db transaction. So if you need to execute more than one db transaction in one rule firing session, then pass in a hibernate SessionFactory to spawn multiple hibernate Sessions. Otherwise pass in a hibernate Session.
GreG
On May 15, 2009, at 11:42, Shannon Lal <shannonlal2909(a)gmail.com> wrote:
I have a question about using Hibernate with Rules. I am wondering if there is some standard practices on how one should reference the Hibernate Session inside a rule. Should this be passed in as a global variable? Is there a better way of doing this? Any advice on this would be greatly appreciated.
Thanks
Shannon
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
17 years, 2 months
Rules and Hibernate Question
by Shannon Lal
I have a question about using Hibernate with Rules. I am wondering if there
is some standard practices on how one should reference the Hibernate Session
inside a rule. Should this be passed in as a global variable? Is there a
better way of doing this? Any advice on this would be greatly appreciated.
Thanks
Shannon
17 years, 2 months
