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] to retrieve objects from a list using context
hi i have to retrieve all the objects from a list. And i should also be able to use a list inside another list. can i do this using context. is there any other way possible? -- View this message in context: http://www.nabble.com/to-retrieve-objects-from-a-list-using-%22context%22-tf3397082.html#a9458384 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] [rule-users] OR with multiple binding in LHS
Hi, I'd like to write a rule that contains an OR condition in the LHS, to match the presence in the working memory of an object with particular values of a specific field. In the rest of LHS, i need to bind other values of the specific object matched. Is there a particular sintax to use for the binding? For example: rule orCondition when myObj : (MyObject(field1 == a) or MyObject(field1 == b)) //correct column field2: myObj.getField2 ()// how to correctly get field3: myObj.getField3()// those values? then System.out.println(fields = + field2 + field3); Thanks in advance, FC. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] trouble with 3.1.0-M1 docs?
I am having trouble reading the 3.1.0-M1 docs/html files in either internet explorer or firefox. All I see under the chapter headings are a bunch of empty xi:include elements. Is there a plug in needed? Any ideas? Thanks, Justine ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] dynamically generated classes, drools classloader, and jsr-94
The application I'm working on will use facts which are dynamically generated classes. After reading http://jira.jboss.com/jira/browse/JBRULES-557 I figured out the trick to get this working was to pass the ClassLoader responsible for the dynamic classes to drools. So I set things up something like: PackageBuilderConfiguration pbc = new PackageBuilderConfiguration(); pbc.setCompiler(PackageBuilderConfiguration.JANINO); pbc.setClassLoader(instanceOfDynamicallyGeneratedClass.getClass().getCla ssLoader()); PackageBuilder builder = new PackageBuilder(pbc); Using this approach I am able to execute rules which interact with the properties of the dynamically generated classes. The problem I've run into is that I'd really like to work with the JSR-94 API. I have two questions: 1. Is the code I referenced above using the correct approach? Or am I already headed down the wrong path? 2. Would passing additional configuration details into the properties argument of the call ruleExecutionSetProvider.createRuleExecutionSet(drlStream, properties) be advisable? I have created a proof of concept to test this and included a patch. Using this approach the application code looks something like this: PackageBuilderConfiguration pbc = new PackageBuilderConfiguration(); pbc.setCompiler(PackageBuilderConfiguration.JANINO); pbc.setClassLoader(instanceOfDynamicallyGeneratedClass.getClass().getCla ssLoader()); Map localProperties = new HashMap(); localProperties.put(packageBuilderConfiguration, pbc); RuleExecutionSet ruleExecutionSet = ruleExecutionSetProvider.createRuleExecutionSet(drlStream, localProperties); Obviously this introduces a JBossRules dependency into my application code, but I am otherwise able to stick to the JSR-94 APIs. I have attached a patch to support this new property and welcome comments on this solution. Thanks, Marty Schoch [EMAIL PROTECTED] pbc-jsr94.patch Description: pbc-jsr94.patch ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Getting validation errors
Mike
What I usually see is that you have a fact or attribute where you can
set the result of your validation:
rule user is miked
when
$id : Identity( usename == miked )
$p : Permission( id == $id )
then
$p.deny();
end
In your application you asserted the Permission object, so you have
it's handle and just check the result:
if( permission.isDenied() ) {
// do something
}
Another way would be to use call back, setting the callback instance
as a global:
global org.sample.PermissionManager permission;
rule user is miked
when
$id : Identity( usename == miked )
then
permission.deny( $id );
end
[]s
Edson
Mike Dougherty 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
--
*
Mike Dougherty
[EMAIL PROTECTED] mailto:[EMAIL PROTECTED]
858.232.3635
http://www.google.com/talk/
*
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Software Engineer - JBoss Rules Core Developer
Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
JBoss, a division of Red Hat @ www.jboss.com
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Re: [rules-users] OR with multiple binding in LHS
Francesco, You need to be careful when doing that, if you are using 3.0.x version. First thing is that both sides of your or must be perfectly balanced, i.e., the same classes in the same order. I didn't tried that, but I think it works if you simply declare your binding once: rule orCondition when myObj : (MyObject(field1 == a, $field2 : field2, $field3 : field3) or MyObject(field1 == b))//correct column AnotherPattern( attr2 == $field2, attr3 == $field3 ) then System.out.println(fields = + field2 + field3); end This is a workaround for the 3.0.x versions.Try it and let me know plz. In 3.1M1 and later, all this is fixed and the correct is to declare the variable in all logical branches: rule orCondition when myObj : (MyObject(field1 == a, $field2 : field2, $field3 : field3) or MyObject(field1 == b, $field2 : field2, $field3 : field3))//correct column AnotherPattern( attr2 == $field2, attr3 == $field3 ) then System.out.println(fields = + field2 + field3); end []s Edson Francesco Campagnola wrote: Hi, I'd like to write a rule that contains an OR condition in the LHS, to match the presence in the working memory of an object with particular values of a specific field. In the rest of LHS, i need to bind other values of the specific object matched. Is there a particular sintax to use for the binding? For example: rule orCondition when myObj : (MyObject(field1 == a) or MyObject(field1 == b))//correct column field2: myObj.getField2 ()// how to correctly get field3: myObj.getField3()// those values? then System.out.println(fields = + field2 + field3); Thanks in advance, FC. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Shadow fact problem?
Mike, Yes, that is a shadow fact unwanted side-effect (nice name for a bug hm? :) ), but I remember fixing something similar as part of another ticket I was working on. Is it possible for you to verify if the problem is happening in trunk? If it is still hapenning, let me know and I will fix it. Thank you, Edson Anstis, Michael (M.) wrote: Hi, I am running 3.1-M1 and have (by way of example) two simple rules; A and B as follows:- *rule* A *when* $a1 : Attribute ( name == Constants.ATTRIBUTES_A, $pa : number ) $a2 : Attribute ( name == Constants.ATTRIBUTES_B, $nc : number ) $p : Process ( attributesList* contains* $a1, attributesList* contains* $a2 ) *then* * double* txy = doSomeMaths($pa, $nc, $p); Attribute a =* new* Attribute(Constants.ATTRIBUTES_C, txy); $p.addAttribute(a); * assertLogical*(a); * modify*($p); System.out.println(Rule 'A' fired); *end* *rule* B *when* $a1 : Attribute ( name == Constants.ATTRIBUTES_C, $txy : number) $p : Process( attributesList* contains* $a1 ) // -- Line causing rule not to activate *then* * double* m = doSomeMoreMaths($txy, $p); System.out.println(Rule 'B' fired); *end* Process exposes an ArrayList of Attribute objects (each having a name\value pair). When the content of the ArrayList held by Process is added to (Rule 'A') the next rule (Rule 'B') is not being activated. Can anybody provide any insight into how best a workaround can be engineered? With kind regards, Mike ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] can't refer to the bound column fields from the LHS?..
Vlad,
Not yet. We may eventually support that in the future through MVEL
integration, but right now you can't do it. You can though use a return
value predicate for that though:
Rule xxx
When
$r1: MyRecord (field1 == “xxx”)
$r2: MyRecord2 (field1 == ( $r1.getField1() ))
Then
System.out.println(“found match: “+$r2+”, “+$r1);
End
I know it was just an illustration example, but always good to
reinforce: for the above case, the best would be to bind the attribute
itself, not the fact:
Rule xxx
When
$r1: MyRecord ( $f1 : field1 == “xxx”)
$r2: MyRecord2 ( field1 == $f1 )
Then
System.out.println(“found match: “+$r2+”, “+$r1);
End
[]s
Edson
Olenin, Vladimir (MOH) wrote:
Hi,
I always assumed that one can refer to the properties of the bound
column in the LHS like this:
MyRecord {
String field1, field2;
}
MyRecord2 {
String field1, field3;
}
Rule xxx
When
$r1: MyRecord (field1 == “xxx”)
$r2: MyRecord2 (field1 == $r1.field1)
Then
System.out.println(“found match: “+$r2+”, “+$r1);
End
Compiler does complain on ‘$r1’ usage in the LHS (as part of
constraint for MyRecord2 fact), but works OK if used only in RHS. The
error I’m getting is: “Unable to find class $r1”. “$r1.getField1()”
doesn’t work either (getting “mismatched token, expecting ‘)’ “ error).
Thanks,
Vlad
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Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
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Re: [rules-users] trouble with 3.1.0-M1 docs?
Justine, Documents are not yet updated to 3.1. Although, to read them, you need a docbook reader/editor... for example: http://www.xmlmind.com/xmleditor/ []s Edson Justine Hlista wrote: I am having trouble reading the 3.1.0-M1 docs/html files in either internet explorer or firefox. All I see under the chapter headings are a bunch of empty xi:include elements. Is there a plug in needed? Any ideas? Thanks, Justine ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] dynamically generated classes, drools classloader, and jsr-94
Martin, You may find some useful information here: http://markproctor.blogspot.com/2006/12/dynamically-generated-class-beans-as.html Thank you for the patch. I will take a look. []s Edson Martin Schoch wrote: The application I'm working on will use facts which are dynamically generated classes. After reading http://jira.jboss.com/jira/browse/JBRULES-557 I figured out the trick to get this working was to pass the ClassLoader responsible for the dynamic classes to drools. So I set things up something like: PackageBuilderConfiguration pbc = new PackageBuilderConfiguration(); pbc.setCompiler(PackageBuilderConfiguration.JANINO); pbc.setClassLoader(instanceOfDynamicallyGeneratedClass.getClass().getCla ssLoader()); PackageBuilder builder = new PackageBuilder(pbc); Using this approach I am able to execute rules which interact with the properties of the dynamically generated classes. The problem I've run into is that I'd really like to work with the JSR-94 API. I have two questions: 1. Is the code I referenced above using the correct approach? Or am I already headed down the wrong path? 2. Would passing additional configuration details into the properties argument of the call ruleExecutionSetProvider.createRuleExecutionSet(drlStream, properties) be advisable? I have created a proof of concept to test this and included a patch. Using this approach the application code looks something like this: PackageBuilderConfiguration pbc = new PackageBuilderConfiguration(); pbc.setCompiler(PackageBuilderConfiguration.JANINO); pbc.setClassLoader(instanceOfDynamicallyGeneratedClass.getClass().getCla ssLoader()); Map localProperties = new HashMap(); localProperties.put(packageBuilderConfiguration, pbc); RuleExecutionSet ruleExecutionSet = ruleExecutionSetProvider.createRuleExecutionSet(drlStream, localProperties); Obviously this introduces a JBossRules dependency into my application code, but I am otherwise able to stick to the JSR-94 APIs. I have attached a patch to support this new property and welcome comments on this solution. Thanks, Marty Schoch [EMAIL PROTECTED] ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] SQL inside rules(new to rules )
Yes, you can. In RHS just call the helper classes and you are done. In LHS you need the from CE (available only in 3.1M1 and later). See previous messages to the list for additional info. []s Edson Arsene Costin wrote: Can I use java helper classes (that connect to a database and retrive data) inside LHS and RHS in order to achive some business requirements. Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites http://farechase.yahoo.com/promo-generic-14795097;_ylc=X3oDMTFtNW45amVpBF9TAzk3NDA3NTg5BF9zAzI3MTk0ODEEcG9zAzEEc2VjA21haWx0YWdsaW5lBHNsawNxMS0wNw-- to find flight and hotel bargains. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Error creating shadow fact for object
I am using drools 3.1 MI I have got a class Message which contains an inner class ProcessRuleDTO When I try to assert the inner class object directly into memory it gives a shadow fact error. The Code Snippet : ProcessRuleDTO processRuleDTO=message.new ProcessRuleDTO(); workingMemory.assertObject( processRuleDTO ); Error : org.drools.RuntimeDroolsException: Error creating shadow fact for object: [EMAIL PROTECTED] at org.drools.base.ClassObjectType.getShadow(ClassObjectType.java:125) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:148) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory.java:68) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:724) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:543) at Example.HelloWorldExample.main(HelloWorldExample.java:57) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:494) at org.drools.base.ClassObjectType.getShadow(ClassObjectType.java:123) ... 7 more Caused by: java.lang.NoSuchMethodError: com.components.Message$ProcessRuleDTO: method init()V not found at com.components.Message$ProcessRuleDTOShadowProxy.init(Unknown Source) ... 12 more Can we or not assert an inner class directly in drools? Thanks -- View this message in context: http://www.nabble.com/Error-creating-shadow-fact-for-object-tf3400224.html#a9468586 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] Problems with rule builder errors
I'm using trunk (revision 10170), and I'm getting an exception when trying to read errors after calling PackageBuilder.addPackageFromDrl(String, Reader). The getErrors() method spits out this exception: java.lang.ArrayStoreException at java.lang.System.arraycopy(Native Method) at java.util.ArrayList.toArray(ArrayList.java:304) at org.drools.compiler.PackageBuilder.getErrors(PackageBuilder.java:380) (The docs for toArray say that exception is thrown if one of the members of the List is the wrong class for the supplied array.) If I instead call printErrors, I get something more useful: java.lang.ClassCastException: org.drools.lang.ExpanderException at org.drools.compiler.PackageBuilder.printErrors(PackageBuilder.java:390) It looks like someone is putting the wrong kind of exception in the error list. This may be related to some bugs in DSL handling. I had to comment out all the blank lines in my DSL file to get it to suppress some other errors, and if I switch to PackageBuilder.addPackageFromDrl(String), the problem goes away. -- Dirk Bergstrom [EMAIL PROTECTED] _ Juniper Networks Inc., Computer Geek Tel: 408.745.3182 Fax: 408.745.8905 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Problem with shadow facts in trunk
I'm using trunk (revision 10170), and I'm getting an error while asserting objects. It looks to be reproducible, in that it only happens with particular instances of one class. But since it's in a method of a generated class (the shadow proxy), I don't have a clue how to debug it. I had a look at the buildHashCode method in ShadowProxyFactory, but the magic was too thick for me. If it helps, the class being shadowed has boolean, float and long attributes, but no char, short, int, double or list. Here's the stacktrace: Exception in thread RLIs Processor java.lang.IncompatibleClassChangeError at net.juniper.dash.data.RLIRecordShadowProxy.hashCode(Unknown Source) at java.util.HashMap.put(HashMap.java:418) at java.util.HashSet.add(HashSet.java:194) at org.drools.reteoo.CollectNode.assertTuple(CollectNode.java:135) at org.drools.reteoo.CollectNode.assertObject(CollectNode.java:212) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:20) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:304) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:176) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory.java:68) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:729) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:548) -- Dirk Bergstrom [EMAIL PROTECTED] _ Juniper Networks Inc., Computer Geek Tel: 408.745.3182 Fax: 408.745.8905 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
