September 2008 - rules-users - Jboss List Archives

by siddhartha banik

Hi, I am facing an issue with Drools Query. Our application serializes working memory after its each execution, to save the rule engine state. Our rule base contains a Query along with other rules: query "GetFactsByValue" ( String $value ) Facts : DataObject( stringValue == $value ) end With this query present in Rule Base, if I insert more then 900 instances of DataObject & then try to serialize the working memory... serialization fails with bellow error: java.lang.StackOverflowError at java.io.ObjectStreamClass.processQueue(Unknown Source) at java.io.ObjectStreamClass.lookup(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) But if I remove the query from rule base, I can insert more then 60,000 objects & then serialize WM without any problem. Not sure if this is a bug in Query feature or problem in the way I have written the Query. I have attached test files. We are using few more queries in our RuleBase like: query "GetAllFacts" ( ) Fact : DataObject( ) end query "GetFactsByDate" ( Calendar $startDate, Calendar $endDate ) Fact : DataObject( startDate >= $startDate, endDate <= $endDate ) end query "GetFactsByParamIdTimeRange" ( ArrayList $paramIDs, Calendar $startDate, Calendar $endDate ) Facts : DataObject( paramID memberOf $paramIDs, startDate >= $startDate, endDate <= $endDate ) end Not sure if they also may fail in some special scenarios. Atleast last 3 Queries we are planning to use in our production. Is it ok to use those? Execution Environment: OS: Windows/ Solaris Drools 4.0.7 jre1.5.0_09 Thanks Siddhartha

16 years, 3 months

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Drools ruturn multiple results based on child objects data length

by Mohamed Riyaz

Hi, In one-to-many relationship object type, Drools generate multiple results based on child objects data length. ie. No of child records belongs to parent object. I wanted the RHS part should be executed only if conditions imposed on child object satisfies. I have two facts with 1-* relationship defined in object mapping. class Invoice{} class Order{ private Set<Invoice> invoices; } *I wanted RHS should be executed with only one result irrespective of child records length.* rule "Multiple results set" when order: Order() invoice : Invoice() from order.invoices then System.out.println("Rule Example (Multiple results set)"+order.getId()); end; Result: Rule Example (Multiple results set)1000 Rule Example (Multiple results set)1000 Please help me in resolving this issue. Regards, Riyaz

16 years, 3 months

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Excel sheet has immediate error

by J Michael Dean

This must be a ridiculous newbie issue, but I have working Sample.xls and com.sample; when, however, I add a new decision table resource in the Eclipse environment, the new spreadsheet is immediately marked by Excel as having an error (with the error decoration). What is the reason for this?

16 years, 3 months

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Drools returns the duplicated results with 'OR' logical operator if both conditions are met.

by Mohamed Riyaz

Hi, I have one more qurey on 'OR' logical operator for the following scenario: I want the the boolen result from parent object which satisfies two different condition sets with child objects. I made the rule which is generated duplicated results if both conditions are satisfied. rule "test" when order: Order ( exists ( condition-1 with child objects) or exists (condition-2 with child objects) ) then SOP("order id "+order.getId()); result : order id 1000 order id 1000 return the results in twice if both the conditions (cond-1 & cond-2) are satisfied. It just combine both results and behaves like 'union all' instead of 'union' function. Please provide me your suggestion on this. regards,riyaz

16 years, 3 months

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logging with WorkingMemoryEventListener

by thomas kukofka

Hello, I tried to overwrite toString(): public String toString() { System.out.println("Type: " + type); return super.toString(); } But the output ist the following: Type: TypeXY [ObjectInserted: handle=[fid:1:7:com.dssrules.InputObject@996cef]; object=com.dssrules.InputObject@996cef] Is there any possiblity to configure the WorkingMemoryEventListener so that it looks like: [ObjectInserted: type=TypeXY: handle=[fid:1:7:com.dssrules.InputObject@996cef]; object=com.dssrules.InputObject@996cef]

16 years, 3 months

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invalid rule package

by Sascha

I'm a member of the drools mailinglist, so please answer me am using jbpm with drools. my rules are defined in an excel sheet. where must i install the class referenced in the excel sheet? org.drools.rule.InvalidRulePackage: Rule Compilation error formular(my class) cannot be resolved

16 years, 3 months

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Returned mail: Data format error

by Post Office

Your message was undeliverable due to the following reason(s): Your message could not be delivered because the destination server was not reachable within the allowed queue period. The amount of time a message is queued before it is returned depends on local configura- tion parameters. Most likely there is a network problem that prevented delivery, but it is also possible that the computer is turned off, or does not have a mail system running right now. Your message was not delivered within 5 days: Host 204.45.179.129 is not responding. The following recipients could not receive this message: <rules-users(a)lists.jboss.org> Please reply to postmaster(a)lists.jboss.org if you feel this message to be in error.

16 years, 3 months

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Help with syntax for detecting when an object exists, none of whose children match a pattern

by Tom.E.Murphy＠wellsfargo.com

As a newbie to Drools (using v4.0.7), I'm struggling a bit with the right way to express the following concept I have a ParentFactObject with an array of ChildFactObjects. The ChildFactObjects have a boolean attribute "TestMe" I want to pattern match all ParentFactObjects for whom all ChildFactObjects have false for TestMe Here's what I've tried: rule "NoTestChildren" when $parentFactObject : ParentFactObject // parent exists ( ) not ChildFactObject // no child exists that has TestMe true ( TestMe == true ) from $parentFactObject.childFactObjects then log("Rule NoTestChildren fired."); end I get the following: org.drools.rule.InvalidRulePackage: [66,4]: unknown:66:4 mismatched token: [@1085,4469:4472='from',<38>,66:4]; expecting type THEN Also tried this: rule " NoTestChildren " when $parentFactObject : Borrower // parent exists ( ) forall ($childFactObject : ChildFactObject // no child exists that has TestMe true ( TestMe == true ) )from $parentFactObject. childFactObjects then log("Rule NoTestChildren fired."); end I've tried a series of variations with similar results. Can anyone provide any guidance on how to do this? Thanks in advance. Tom Murphy This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation.

16 years, 3 months

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Re: [rules-users] logging with WorkingMemoryEventListener

by Shyam, Pallav (MSCIBARRA)

You can override the toString method of InputObject to return the type information. ________________________________ From: rules-users-bounces(a)lists.jboss.org To: Rules Users List Sent: Fri Sep 05 22:31:04 2008 Subject: [rules-users] logging with WorkingMemoryEventListener Hello, I want to use WorkingMemoryEventListener and AgendaEventListener for logging. But I have a generic InputObject as fact which has a parameter "type" to disitnguish between different fact types, but all facts are instances of the class InputObject, only the type Paramater has different values. Therefore in the log using DefaultWorkingMemoryEventListener I see only that an Object of class InputObject is inserted but not which type teh Object has. Is it possible to configure the WorkingMemoryEventListener that also the type is logged? Regards Thomas -------------------------------------------------------- NOTICE: If received in error, please destroy and notify sender. Sender does not intend to waive confidentiality or privilege. Use of this email is prohibited when received in error.

16 years, 3 months

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logging with WorkingMemoryEventListener

by thomas kukofka

Hello, I want to use WorkingMemoryEventListener and AgendaEventListener for logging. But I have a generic InputObject as fact which has a parameter "type" to disitnguish between different fact types, but all facts are instances of the class InputObject, only the type Paramater has different values. Therefore in the log using DefaultWorkingMemoryEventListener I see only that an Object of class InputObject is inserted but not which type teh Object has. Is it possible to configure the WorkingMemoryEventListener that also the type is logged? Regards Thomas

16 years, 3 months

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rules-users September 2008