Bug 1020795 - Extending events doesn't allow to have smaller @expires
Extending events doesn't allow to have smaller @expires
Product: JBoss BRMS Platform 6
Classification: JBoss
Component: BRE (Show other bugs)
Unspecified Unspecified
unspecified Severity high
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Assigned To: Edson Tirelli
Lukáš Petrovický
Depends On:
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Reported: 2013-10-18 05:46 EDT by Richard Bourner
Modified: 2014-02-09 19:12 EST (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-10-18 09:09:22 EDT
Type: Bug
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Description Richard Bourner 2013-10-18 05:46:56 EDT
Description of problem:
When extending an event (either in Java or as declarative), if the extended event has a @expires value smaller than its parent, then it is ignored and the parents @expires values is taken.

declare SimpleEvent
    @role( event ) 
    @timestamp( eventDate.getTime() ) 
    @expires( 2d ) 

declare AvalancheEvent extends SimpleEvent 
    @role( event ) 
    @timestamp( eventDate.getTime() ) 
    @expires( 5m ) 

The reason is in the following class: org.drools.core.reteoo.builder.PatternBuilder.

private static long getExpiratioOffsetForType(BuildContext context, 
                                                  ObjectType objectType) { 
   long expirationOffset = -1; 
   for ( TypeDeclaration type : context.getRuleBase().getTypeDeclarations() ) { 
       if ( type.getObjectType().isAssignableFrom( objectType ) ) { 
           expirationOffset = Math.max( type.getExpirationOffset(), 
                                        expirationOffset ); 
   // if none of the type declarations have an @expires annotation 
   // we return -1 (no-expiration) value, otherwise we return the 
   // set expiration value+1 to enable the fact to match events with 
   // the same timestamp 
   return expirationOffset == -1 ? -1 : expirationOffset+1; 

It seems like we can only extends an event if the @expires value is greater than its parent.

Version-Release number of selected component (if applicable):
Drools 6.0.0.CR5

How reproducible:

Steps to Reproduce:

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Expected results:

Additional info:
Comment 2 Edson Tirelli 2013-10-18 09:09:22 EDT
Richard, this works as designed. The reason is that if you have a rule that uses the parent type, it still has to match the derived type. E.g.:

rule X

Because of such situations, the expiration offset of an event is always the max between the individual expiration offsets in each rule.

Please note that the global expiration offset for a given type discards the event from the session, but any constraints that would reduce the matching temporal interval are still applied to each rule.

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