Re: [rules-users] Example of contains operator...
On 2/13/07, jdepaul [EMAIL PROTECTED] wrote: Ok thanks - that worked when partnerList was an ArrayList, how would I code my contains condition if the parternList was a HashMap!? You could write an accessor in your model called getPartnerListKeys() which returns getPartnerList().keySet() and then use (partnerListKeys contains 2900) in your rule. I'm not 100% sure (started with JBoss Rules only a couple of days ago), but I'm pretty confident that this should work. hth Marcus Michael Neale wrote: contains works on the Collection interface. So if parnerList is a ArrayList of String, then you could do: parnerList contains 2900 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Using Java to write rules?
On 3/2/07, Aeinehchi Nader [EMAIL PROTECTED] wrote: I wonder if it is possible to write rules and make queries toward the knowledge database of Jboss Rules using Java language itself. What I need is to to be able to access the rule engine's API. I do not want to use Drools language or XML. Although I guess that it would be possible to make all those calls manually, I wonder what the advantage would be. The RHS of a rule is already Java code and the LHS provides a lot of Java functionality or can use eval() if neccessary. Also you can embed the DRL in your source or dynamically create new rules and add those using StringReader if need be: I'm currently working on a business project where new rules are assembled by the application: POC works like a charm. If that is not feasible, I'd probably take a look at the drools-decisiontables codebase which basically does a similar thing: replace DRL/XML syntax with a new interface (decision tables). Anyway, that's just my $0.02 ;) Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Rules with Lookup Tables...
On 3/2/07, Francisco Brum [EMAIL PROTECTED] wrote: I also need to make a rule with a lookup tables, and I have found that the new version of rules support 'from'. Another solution could be the the use of globals: http://labs.jboss.com/file-access/default/members/jbossrules/freezone/docs/3.0.5/html_single/index.html#d0e719 You could insert a global PartnerList and a global PortLocationList and evaluate on these. It somewhat depends on your situation: using FROM is definitely more powerful, globals are quicker to implement because you probably have this List object laying around already. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Using rules with database scenario
On 3/9/07, Uday Kamath [EMAIL PROTECTED] wrote: We had similar use case. What we do is we model the Schema elements, generate Java Beans (pojo), and write rules using these Pojo. Now we have written a Service on top which takes Hibernate QL and gets the database records as the same Pojos that Rules are defined on and fire the Rules. Thus the service is generic and can be changed to take any Query. The Rules can me modified and changed anytime and redeployed but business objects in form of Pojos remain the same. Hope this helps -Uday From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Joe Chuby Sent: Friday, March 09, 2007 3:53 AM To: rules-users@lists.jboss.org Subject: [rules-users] Using rules with database scenario Hi all, First time trying to learn JBoss Rules here. We have a pretty large database (DBMS), we want to build some rules and retrieve data based on the rules. Could someone give a hint or an example of this usage scenario? I mean, how can I use rules for database query, without writing my rules in SQL directly? We are currently writing everything in HQL (Hibernate), but the rules change every 3 months on average, so that's not a way to maintain the system. Therefore, we want to extract that portion of the business logic out of the code. The data structure does not change, but the rules keep on changing. I'm reading the user's guide, running thru the examples, writing some of my own, but still no clue how to make it work with database. If someone could give a sample, that would be greatly appreciated. Thanks a lot. That's probably the best solution. Using the current version (3.1M1), you can use the FROM keyword to reference facts from List object returned from a method call on a service, for example. Something like this works very good in my current testing project: rule foobar when MyObject( someValue = foobar ) from MyObjectDAO.loadAll() then ... end The DAO then uses Hibernate to load some objects and returns a ListMyObject which can be used by Drools. As Uday already wrote, you could also write a DAO which retrieves arbitrary objects using a given HQL statement. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Getting validation errors
Hi Mike,
On 3/13/07, Mike Dougherty [EMAIL PROTECTED] wrote:
Hello,
I am using JBoss Rules to validate entities before storing them in the
database. I therefore need a way to inform the calling code that the entity
which was asserted failed verification. The only way I have been able to
find that works is to assert an exception from within the rule file. For
example:
rule user is 'miked'
when
identity : Identity( username == miked )
then
assertLogical(new IllegalStateException(Entity failed verification.));
end
Then in the Java that fires the rule, I have:
workingMemory.fireAllRules();
for(Iterator i = workingMemory.getObjects(Exception.class).iterator();
i.hasNext(); ) {
System.out.println(Exception: +i.next());
}
Which seems to be working OK. But I wanted to see if maybe there is a better
way to accomplish what I need.
Thanks for you help.
Mike
My approach would be to derive all objects that will be validated from
a superclass, e.g. ValidatedObject, which provides a boolean property
validated.
Then you can set this property in your rules and later on display
warning/error messages for those objects that failed validation.
Best regards
Marcus
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[rules-users] Remotely debugging application server code
Hi list, I'm experiencing problems when remotely debugging my JBoss-Rules-using application running on an application server. The application server is JBoss 4.2.1.GA and I connect to it via Eclipse. My JBoss Rules version is 4.0.3. As soon as I start inserting facts, the application seems to hang. The debugger reports the status Running on all threads, however the application does not seem to reach the next statement (which is a logging statement). When I disconnect the debugger, the execution resumes and everything works fine. The displayed callstack when suspending the execution claims that the execution has reached the next breakpoint, however I'm in doubt that this is true and there's no way for me to resume the execution. Maybe some of you have experienced something similar. I had no problems at all debugging the code that does all the work before the fact insertion. Only after starting to insert facts the debugging goes awry. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Globals asserted as facts... how to modify them...
Hi, On Feb 16, 2008 1:00 PM, mmquelo massi [EMAIL PROTECTED] wrote: Hi everybody, I followed all the topics about globals and the fact that they are immutables. I also understood that once we decide to reason over globals, it's time we no more use them and we start to use simple WM facts. Now... I tell you my scenario. I have got two globals. A request global and a reply global. The first one is a Request java instance and the second one is a Reply java instance. They belong to the Object model I designed. My application makes a request to the rule engine passing it a request as global, and get back a reply from it receiving a modified reply global. I use a ruleflow to execute the rules. I think everything would be perfect and smooth if I had not the need to reason over the reply during the rule session That's the point! I do not just need to modify the reply global in order to get the final value outside the rule engine, but I DO need to reason over it INSIDE the rule session. So what should I do in order to reason over the reply INSIDE AND OUTSIDE the Rule Session? Should I insert the reply global into the WM? Let assume I do that, what happen if I pass the reply global to a drools function which alters the reply? Imagine a rule as follows and imagine I previously inserted the reply global into the WM: ... global my.object.model.Reply reply ... rule addcriminal_2_reply when $p: Person(job==criminal) then addCriminaltoReply(reply, $p ); end Will this alteration affect the corresponding Reply() fact in the WM as well? Now let see this other rule: (Same, let imagine i previously inserted: insert(reply); ) global my.object.model.Reply reply rule FullFill_replyCode when $r: Reply(code==john.wayne) from reply then $r.code.name = john; $r.code.lastname = wayne; end If I execute this rule in a ruleflow, do i need to update($r) in order to get the modified $r value in the next ruleflow node? And what happens to the global??? Will it get modified as well? I am sure you can help me. Bye bye. Massi have you thought about initializing and asserting the Reply instance in a separate rule at the beginning of the ruleflow? After the ruleflow has finished, you can look for instances of Reply in the WorkingMemory and retrieve your Reply object. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Drools as OSGI bundle
Hi, On Wed, May 14, 2008 at 1:12 PM, ekke [EMAIL PROTECTED] wrote: just seen that SpringSource published Drools as OSGI bundles http://www.springsource.com/repository/app/search?query=drools http://www.springsource.com/repository/app/search?query=drools - I'll create a request to get 4.0.7 - they published 4.0.4 next two weeks I'll try the bundles ekke -- thanks for the hint! It's especially interesting that they apparently managed to deploy core, compiler and JSR94 interface in separate packages. Have you tried these packages already? I'd assume that one has to specify Eclipse-RegisterBuddy: com.springsource.org.drools or some equivalent so Drools can find the classes from the bundles that are using it? I tried to package Drools in OSGi bundles myself some weeks ago but stumbled over some class loader issues after dividing the components into their own bundles. If SpringSource managed to build working manifest files, it would be great if the Drools team would incorporate these into the JAR-distribution. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: Re:[rules-users] JUnit testing
Glad that I could actually contribute something back to this great project.
I put together a patch for this issue in the JIRA at
http://jira.jboss.org/jira/browse/JBRULES-1618 as promised.
Best regards
Marcus
On Tue, May 20, 2008 at 2:34 AM, Mike Dean [EMAIL PROTECTED] wrote:
Sorry to ask question and then figure it out! I just substituted the actual
name of my suite class instead of saying this.class and it works
beautifully. I am now testing Drools with JUnit 4 with no problems, after
nearly six months! THANK YOU.
- Mike
Mike Dean wrote:
Thanks to both of you for pursuing this problem. I have worked around it
by putting my business classes and rules in a separate Drools project,
testing everything there, and then copying them to my RCP. I look forward
to a better solution!
I must confess Java ignorance, but I use a test suite and try to
instantiate the engine once and then run a series of tests. My crash
occurs before I get to the individual tests. However, the setUp routine
is static, and your code work around cannot be executed in a static
context. Where exactly to you put the test for a null classloader?
Thanks again. I thought this issue simply died.
Marcus Ilgner wrote:
Hi Edson,
thank you very much for testing this! Since I could not discern any
differences between your approach and mine, I decided to resolve the
issue manually by inserting a work-around in my test routine which
sets the context class loader for the current thread before calling
the method under test.
if (Thread.currentThread().getContextClassLoader() == null) {
Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
}
My guess is that the custom JUnit 4 class runner
(SpringJUnit4ClassRunner) somehow is responsible for the faulty
behaviour.
Thanks again
Marcus
On Mon, May 19, 2008 at 3:09 PM, Edson Tirelli [EMAIL PROTECTED] wrote:
All,
I see that the code in that spot is weak and could be improved.
Although,
using drools 4.0.7, I successfully created a junit 4 test that I paste
bellow. Also, the whole drools code is tested with junit 3 and we have
no
problems. For instance, look at our integration tests here:
http://anonsvn.labs.jboss.com/labs/jbossrules/branches/4.0.x/drools-compiler/src/test/java/org/drools/integrationtests/
The code I used to create the junit 4 test is based on the default
example create by the drools plugin + the snippet you showed bellow:
@Test
public void testRuleBase() {
try {
//load up the rulebase
RuleBase ruleBase = readRule();
StatefulSession workingMemory =
ruleBase.newStatefulSession();
//go !
Message message = new Message();
message.setMessage( Hello World );
message.setStatus( Message.HELLO );
workingMemory.insert( message );
workingMemory.fireAllRules();
workingMemory.dispose();
} catch (Throwable t) {
t.printStackTrace();
Assert.fail(Something is wrong: +t.getMessage());
}
}
/**
* Please note that this is the low level rule assembly API.
*/
private RuleBase readRule() throws Exception {
//read in the source
Reader source = new InputStreamReader(
DroolsTest.class.getResourceAsStream( /Sample.drl ) );
PackageBuilderConfiguration conf = new
PackageBuilderConfiguration();
JavaDialectConfiguration javaConf = (JavaDialectConfiguration)
conf.getDialectConfiguration(java);
javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);
javaConf.setJavaLanguageLevel(1.5);
PackageBuilder builder = new PackageBuilder( conf );
builder.addPackageFromDrl( source );
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( builder.getPackage() );
return ruleBase;
}
Hope it helps,
Edson
2008/5/19 Marcus Ilgner [EMAIL PROTECTED]:
Hi list,
I'm reviving this thread because I happen to have the same problem.
On Sun, Mar 23, 2008 at 7:34 PM, Mike Dean [EMAIL PROTECTED] wrote:
Thanks (months later!). I have cut down my code example below to
show
this
issue more clearly:
John J. Franey wrote:
NullPointerException on line 146 means classLoader is null. That
is
odd.
I have no idea why the code that gets classLoader won't work in
eclipse's
junit runtime, but does when run in your eclipse plugin.
It seems indeed like during JUnit tests, the context classloader of
the thread gets not set (null).
The code leading up to the problem is as follows:
PackageBuilderConfiguration conf = new PackageBuilderConfiguration();
JavaDialectConfiguration javaConf = (JavaDialectConfiguration)
conf.getDialectConfiguration(java);
javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);
javaConf.setJavaLanguageLevel(1.5);
RuleBase ruleBase
Re: [rules-users] Drools 4.0.7 supports Clustering and DB interaction ?
Hi, On Fri, May 30, 2008 at 10:13 AM, Thalupula Ravi [EMAIL PROTECTED] wrote: Hi, Can some one answer my questions regarding drools support 1. is drools supports clustering? I don't have that much experience on the topic, but I my guess would be that if you write your code on top of some application server like JBoss AS, clustering should be fairly transparent to your application. You may want to have a look at http://docs.jboss.com/jbossas/guides/clusteringguide/r2/en/html/ to evaluate this approach with regard to your requirements. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] How to Configure Hibernate and use in Drools
Hi Sekhar, On Mon, Jun 2, 2008 at 5:56 PM, RAJA SEKHAR REDDY MAYALURU [EMAIL PROTECTED] wrote: hi , i need to connect to data from a .drl file from a rule . i need to get the dynamic data from DB to frmae a rule . I have seen that Drools support Hibernate . so how can i connect to DB from a drl to DB using hibernate . i need to have dynamic (data ) rules in my drl file . we can configure hibernate on top of pojo , my main intrest is to know how to invoke hibernate from a drl file . how to execute named queries in the rule project . please send me the steps to configure hibernate and use it in rules project . while you cannot directly access your ORM in Drools, it's nonetheless quite simple: just write some DAO which provides methods to access your objects - you could, for example, simply have a method which takes the name of a NamedQuery and executes it - and register it as a global. Then you can use the from syntax to retrieve the objects in your rules. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] eclipse-jdtcore.jar
Hi, just as a side note: I had one project using Eclipse which already used another version of the JDT core. Encountering the same problem, I just put the core-3.2.3.v_686_R32x.jar from Drools in my project, too, and it worked without problems. Best regards Marcus On Tue, Jun 3, 2008 at 3:25 PM, Augusto Rodriguez [EMAIL PROTECTED] wrote: Hi Corneil, Unluckily I've seen that error more often that I would like. It's not a bug in drools, but is related to the dependencies of the drools-compiler. There's a big chance that you have a different version of the JDT core jar in your classpath (drools depends on version 3.2.3 - the filename of that jar is core-3.2.3.v_686_R32x.jar). This jar is used by drools to compile the rules. I hope this helps you to solve this issue. Cheers, Augusto Corneil du Plessis wrote: I am experiencing a conflict with a deployment: We used WebSphere Application Server 6.0.2.x in our integration testing environment and now the deployed application at a customer site is reporting the following exception: java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult: method getProblems()[Lorg/eclipse/jdt/core/compiler/CategorizedProblem; not found at org.drools.commons.jci.compilers.EclipseJavaCompiler$3.acceptResult(EclipseJ avaCompiler.java(Compiled Code)) at org.eclipse.jdt.internal.compiler.Compiler.handleInternalException(Compiler. java(Compiled Code)) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java(Compiled Code)) at org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaComp iler.java(Compiled Code)) at org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCo mpiler.java:51) at org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java :342) Has anyone else comes across this? I am not sure where the JAR comes from because has not version info. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] eval question
Hi Mike, On Wed, Jun 4, 2008 at 3:53 PM, Mike D [EMAIL PROTECTED] wrote: I'm close, but no cigar... I have a header record amount and did an accumulate on a detail amount. The sum of the detail can be within a percent of the total. The $valueUsAmt is the header, and the totValue is the sum of lines... What I need to do is to take the valueUsAmt * .0001 and if that is = the abs value, all is good. eval($valueUsAmt.subtract($totValue).abs().compareTo(???) = 0) It's the * .0001 that is giving me the problem. Any help would be appreciated. Thanks! Have you tried compareTo(new Float($valueUsAm*0.0001f)) ? I'm not 100% percent sure if this is faster, but eventually you could even use Number(intValue 0) from $valueUsAmt.subtract($totValue).abs().compareTo(new Float($valueUsAm*0.0001f)) Hope that helps Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] precompile rules
Hi, On Fri, Jun 6, 2008 at 10:02 PM, apor [EMAIL PROTECTED] wrote: hi, i am new with drools. one question , The rules can precompilar ? yes, you can compile your rulebase and serialize then later deserialize the compiled packages. From the documentation: 7.1.4.4. Serializing Practically all of the rulebase related objects in Drools are serializable. For a working memory to be serializable, all of your objects must of course be serializable. So it is always possible to deploy remotely, and bind rule assets to JNDI as a means of using them in a container environment. Please note that when using package builder, you may want to check the hasError() flag before continuing deploying your rules (if there are errors, you can get them from the package builder - rather then letting it fail later on when you try to deploy). Best regards Marcus Thank you -- View this message in context: http://www.nabble.com/precompile-rules-tp17700145p17700145.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] logging
On Wed, Jun 18, 2008 at 10:29 AM, Jaroslaw Kijanowski [EMAIL PROTECTED] wrote: May be you could store the names of every fired rule in a global by putting drools.getRule().getName() into a list on the RHS. Then you could get all rules in your package ( pkg.getRules() ) into another list and diff both collections (another_list.removeAll(list) ). Thalupula Ravi wrote: Hi, How can i log that where a rule is executed or not for supplied data? If the rule fires, in 'then' section i can have a log statement. How can i log that the rule is not executed?? I need to log in both scenarios. Thanks, Ravi Thalupula Hi Ravi, have you looked at the logging facilities included in Drools, especially AgendaEventListener? That way you wouldn't have to manually log activations in the RHS of every rule. Diffing the the names of available rules versus those collected by the logging seems to me the most straightforward solution, too. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Re: access to in working memory generated objects
Hi, On Wed, Jun 18, 2008 at 1:17 PM, Alexander Claus [EMAIL PROTECTED] wrote: I want to use rules which shall generate as a consequence a new java object. The GUI of my application shall display the new generated objekt. but how can the GUI of my application get informed by the rule engine that it has generated a new object (Warning)? And how the GUI or any other java component can access this new generated object from outside? Have a look at org.drools.event.WorkingMemoryEventListener. I think you find yourself how to use it. Best regards. Alexander Claus another approach would be to register some service as a global to your working memory. Then, when creating the object in the RHS of your rule, you call some method on it like this rule Value below threshold when FactX ( property threshold) then Warning warning = new Warning( Under threshold ); service.addWarning(warning); insert(warning); end Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Beginner question about Dynamic Beans
Hi Francesco,
On Wed, Jul 2, 2008 at 10:28 AM, fmarchioni [EMAIL PROTECTED] wrote:
Hi all drools users!
I'm just learning Drools from the manual, I have a question about Dynamic
Beans. I have added PropertyChangeSupport and listeners to my Beans: I can
see that inside my rule, if I change
one property the bean.
rule Check Age
salience 20
when
b : Buyer (age 18)
then
bankApp.addMessage(Messages.AGE_UNDER_18);
b.setCash(4); // CHANGE OF PROPERTY
end
..then all rules are fired back again. Is it the correct behaviour ? is
there a way to re-evaluate only some of the Rules back again ?
thanks a lot
Francesco
--
that's strange. From my experience, only those rules that depend on
the cash property should be fired if the new value triggers an
activation that wouldn't have been triggered for the old value. Could
you post the code of your PropertyChangeSupport implementation?
Here's some sample code from one of my projects:
public abstract class BindObject { /* simple proxy */
private PropertyChangeSupport propertyChangeSupport = new
PropertyChangeSupport(this);
public void addPropertyChangeListener(PropertyChangeListener _listener) {
propertyChangeSupport.addPropertyChangeListener(_listener);
}
public void addPropertyChangeListener(String _propertyName,
PropertyChangeListener _listener) {
propertyChangeSupport.addPropertyChangeListener(_propertyName,
_listener);
}
public void removePropertyChangeListener(PropertyChangeListener _listener) {
propertyChangeSupport.removePropertyChangeListener(_listener);
}
public void removePropertyChangeListener(String _propertyName,
PropertyChangeListener _listener) {
propertyChangeSupport.removePropertyChangeListener(_propertyName,
_listener);
}
protected void firePropertyChange(String _propertyName, Object
_oldValue, Object _newValue) {
propertyChangeSupport.firePropertyChange(_propertyName,
_oldValue, _newValue);
}
protected void firePropertyChange(String _propertyName, int
_oldValue, int _newValue) {
propertyChangeSupport.firePropertyChange(_propertyName,
_oldValue, _newValue);
}
protected void firePropertyChange(String _propertyName, boolean
_oldValue, boolean _newValue) {
propertyChangeSupport.firePropertyChange(_propertyName,
_oldValue, _newValue);
}
}
Now I simply inherit my classes from BindObject and write my setters like this:
public final static String PROPERTY_ARTICLE_NUMBER = articleNumber;
public void setArticleNumber(String _articleNumber) {
String oldValue = _articleNumber;
articleNumber = _articleNumber;
firePropertyChange(PROPERTY_ARTICLE_NUMBER, oldValue, articleNumber);
}
This has been working great for me so far.
HTH
Marcus
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Re: [rules-users] drools-eclipse sources?
On Thu, Jul 3, 2008 at 8:23 AM, Markus Helbig [EMAIL PROTECTED] wrote: Hi everybody, where can i get the sources for drools-eclipse? I remember they were in svn but currently i can't find them there. Cheers Markus Hi Markus, have a look at http://anonsvn.labs.jboss.com/labs/jbossrules/trunk/drools-eclipse/ Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] insert a collection/ArrayList of facts
On Thu, Jul 3, 2008 at 2:55 PM, thomas kukofka [EMAIL PROTECTED] wrote: Hello, is it possible to insert an Arraylist of facts like this?: ArraList list; wm.insert (list); And if yes how can I iterate over the list in the when-part of the rule? The rule should be applied to all elements of the inserted list. A short drl-example would be perfect. Kind Regards Thomas Hi Thomas, I'm not sure if this is what you want but I think this should work: rule ItemsFromList when $list : List(); $item : MyObject() from $list; then // do something end Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Using from
Hi Aziz,
On Thu, Jul 17, 2008 at 8:26 PM, Aziz Boxwala [EMAIL PROTECTED] wrote:
I have the following class structure.
Class GrandFather {
ListFather fathers;
public ListFather getFathers() {return fathers;}
}
Class Father {
int age;
ListSon sons;
public int getAge() {return age;}
public ListSon getSons() {return sons;}
}
Class Son {
int age;
public int getAge() {return age;}
}
I'd like to write a rule that finds all the Fathers who have age 45 and
have Sons where the son's age is greater than 5. But I can't figure out how
to use from to iterate over father first and then over son.
Any help will be greatly appreciated.
Thanks,
--Aziz
Something like this?
rule FatherAndSon
when
$father : Father(age 45)
$son : Son(age 5) from $father.sons
then
// do something
end
Best regards
Marcus
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Re: [rules-users] How to avoid circular rule activation for non circular problems?
On Thu, Jul 24, 2008 at 3:28 PM, Ralph Ammon [EMAIL PROTECTED] wrote: I'd like to get some hints to improve the rules of my simple planning system. My simple planning system is derived from the HelloWorld Drools Project. The job of my planning system is to calculate startTime and endTime as function of duration and predecessors for each task. Each task has the fields long duration; SetTask predesessors; long startTime; long endTime; For each task the rule (endTime = startTime + duration) should hold. If a task has no predecessors, then its startTime should be 0. If a task has predecessors, then is should start at the latest endTime of all predecessors. Maybe something like this would work? rule Calc EndTime no-loop true when $t : Task(endTime != (startTime+duration)) then $t.setEndTime( $t.getStartTime() + $t.getDuration() ); System.out.println( Drools: Set + $t.getName() + .EndTime to + $t.getEndTime() ); update( $t ); end Afaik, this will also enable Drools to only check this rule if one of the attributes used in the LHS is changed. So if you change any other field of your object at some point, this rule will not be evaluated again. Please note that I haven't checked the syntax but I think that it should work like this. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Handle activationCancelled Event
On Fri, Jul 25, 2008 at 1:04 PM, Claudio Rainoldi [EMAIL PROTECTED] wrote: Hi everyone, i'm developing a java application using drools 4 for domotic control; i ve implemented a listener on my working memory with the method afterActivationFired(...) and activationCancelled(...) . At startup of my app i've write the following lines: listener = new FiredRulesListener(); workingMemory.addEventListener(listener); Each time a rule is fired the method afterActivationFired(...) is called and it is ok; but when the rule stop to be true the method activationCancelled isn't never called. Afaik, activationCancelled works like this: The fact is added, a rule would match, the activation is scheduled. However, another rule (probably with higher priority) matches, too, and it modifies the fact in a way that would make the first rule not match - thus, the activation is cancelled and the corresponding listener method gets called. Somebody correct me if I'm wrong, please ;) ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Handle activationCancelled Event
On Fri, Jul 25, 2008 at 3:15 PM, Ingomar Otter [EMAIL PROTECTED] wrote: Why don't you use facts for control? when mylamp==on then assert/update sth? That looks easier to me. --I Indeed. If I understand your problem correctly, the corresponding rule should rather look like rule Lamp is not on when $lamp : Lamp(state != on) then // the lamp isn't on anymore - do something end Best regards Marcus Am 25.07.2008 um 13:04 schrieb Claudio Rainoldi: Hi everyone, i'm developing a java application using drools 4 for domotic control; i ve implemented a listener on my working memory with the method afterActivationFired(...) and activationCancelled(...) . At startup of my app i've write the following lines: listener = *new* FiredRulesListener(); workingMemory.addEventListener(listener); Each time a rule is fired the method afterActivationFired(...) is called and it is ok; but when the rule stop to be true the method activationCancelled isn't never called. I try to be more clear: i 've the following rule: when mylamp==on then System.out.println(light 1 on); When i turn on the light 1 the method afterActivationFired(...) is called, but when i turn off the light the method activationCancelled isn't called. Can someboy help me?? Thanks in advance. Cla ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Request for assistance in removing eval from a rule
Hi, On Wed, Sep 17, 2008 at 12:48 AM, Warren, David [USA] [EMAIL PROTECTED] wrote: If it helps, RulesUtil.containsKeywordString() checks to see if a string passed in is present in a list of keywords held in the class. maybe it would work if you asserted your keywords as a ListString global and then did something like s1 : Sensor( source == X, $rfp : RFP , $rfp memberOf keywordList , $tcn : TCN) But I'm not sure if memberOf would work in this case since the documentation states that it requires a variable. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Storing RuleDescr and/or PackageDescr in a database table
Hi, On Mon, Sep 15, 2008 at 10:11 PM, imraan [EMAIL PROTECTED] wrote: Users in my system will be able to configure their own rules to an extent through a UI. I will create these rules programmatically using the org.drools.lang.descr package. Right now, I am trying to see if its possible to store the RuleDescr or PackageDescr object(s) in a database. Is there another way to store these objects in a database besides storing the contents of a DRL dump? Thanks, Imraan those objects implement java.io.Serializable, so you can directly write them to and from a storage type of your liking. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Defining fallback rules
Hi all, I'm currently puzzled on how to implement a sort of fallback rule. In my scenario I have a couple of articles and payments related to those articles. Now I need to distribute royalties to the authors of these articles. There's a common business logic which says distribute X percent for articles of type T, Y percent for articles of type S and Z percent for all other articles. At first, my approach was to write the rules like this (omitting a rule for type 'S' for the sake of brevity): rule1 activation-group article1 salience 100 when $article : Article(type == 'T') $payment : Payment( article==$article ) then account(x%) end rule3 activation-group article1 salience 0 when $article : Article() $payment : Payment( article==$article ) then account(z%) end However, I quickly found out that the use of activation-group will then only consider all articles of type T and ignore all other fact-combinations. Retracting payments from the WM is also not feasible since there may be other rules that should work on them. I also cannot write the last rule as Article( type != 'T', type != 'S' etc) since new article types may be added later on and it would not be manageable to update all previously written rules (which may very well number in thousands in the future). Now I'm a bit stuck on this issue and would welcome any hints. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Does drools have any trigger?
2009/4/24 Lindy hagan lindyha...@gmail.com: I was looking at Blaze Advisor documentation it has “when changed” operator that only fires when an attribute of an object changes. A business analyst might use it to watch for any important issue, such as a thermostat warning in a process plant or a particular stock reaching a certain price or volume. In similar way does Drools have this feature? Can any one correct if I am wrong: Rules can be updated by business users thru BRMS and Guvnor? (I did not get chance to go thru these) Hi, you can register your business objects (facts) as dynamic facts. They will need to implement addPropertyChangeListener and related methods. That way, as soon as a property that is used in a rule changes, the rule will re-evaluate and fire if appropriate. See section 2.5.4.7. of the docs for more information on this feature. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] The Eclipse JDT Core jar is not in the classpath error
2009/6/2 Chris Richmond crichm...@referentia.com: Hello, I am using netbeans and ivy with Drools 5. I have successfully named, published the jars from drools to and could build my port of the stock ticker application in netbeans, but when I try to run it, I get the following error: java.lang.NoClassDefFoundError: org/antlr/runtime/tree/TreeNodeStream I have the antlr-runtime jar from the bin/lib on my classpath where I added all the others, but it always fails at this line In loadRuleBase() in Broker.java of the stock ticker sample builder.add( ResourceFactory.newInputStreamResource( Broker.class.getResourceAsStream( RULES_FILE ) ), ResourceType.DRL);. Does anyone have any ideas what jar I might be missing if it’s not the antlr-runtime? Thanks, Chris Hi, in one of my projects, I actually needed two different versions of antlr in the classpath. Did you check if the class referenced in the exception actually exists in the deployed antlr jar file? Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] A relational SQL Database as RuleBase
On Wed, Jun 3, 2009 at 10:21 PM, r.r.neum...@freenet.de r.r.neum...@freenet.de wrote: Hi guys, my question is listed in the topic. Is it possible? I read, that Drools 4 provides such a feature but in this case, there is noch DSL available? Is this correct? What's about Drools 5, same thing? Thanks for an answer! Regards René If you want to store the rules in a RDBMS in order to have them accessible from many sources and/or outside your application, you may want to consider using Guvnor to decouple the rule management from the main application code. Inside your app you can then download the rules which were created within Guvnor from a URL on the application server. Maybe that helps. Best regards Marcus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
