[jboss-jira] [JBoss JIRA] (JBRULES-3161) CEP - event both in and out of time window at the same time

[Edson Tirelli (Resolved) (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edson Tirelli resolved JBRULES-3161.
------------------------------------

    Resolution: Rejected


I think this is just a misunderstanding of how the engine works. A few comments that might help to clarify things:

* The rules are not mutually exclusives. The first rule says "for every Event that arrives, fire the rule". The time window defined there is basically useless as every event will belong to that window before being expired. The second rule says "whenever there is no event in the last hour, fire the rule". So the rule will fire every time there is a 1h+ period without any event arriving. The complement of the rule is "exists( Event() over window...)" and that was in my understanding what you wanted to represent in the first rule.

* Temporal windows use event starting timestamps as their window anchor. Duration is not taken into account for temporal windows.

Hope this clarifies the issue. I am closing the ticket, but if you have more questions, please send them to the mail list as you will receive answers more quickly.
                
> CEP - event both in and out of time window at the same time
> -----------------------------------------------------------
>
>                 Key: JBRULES-3161
>                 URL: https://issues.jboss.org/browse/JBRULES-3161
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 5.2.0.Final
>         Environment: jre 6u24, windows 7 x64
>            Reporter: Radai Rosenblatt
>            Assignee: Edson Tirelli
>            Priority: Critical
>         Attachments: droolsbug.zip, illustration.jpg
>
>
> given this object:
> public class Event {
>     private Date started;
>     private Date finished;
>     private long duration;
>     //getters and setters
> }
> the following drools code:
> declare Event
>     @role( event )
>     @duration ( duration )
>     @timestamp( started )
> end
> rule "Event Exists In Window"
> when
>     $eventOne : Event() over window:time( 1h ) from entry-point "Event Stream"
> then
>     //nothing
> end
> rule "No Event Exists In Window"
> when
>     not ( Event() over window:time( 1h ) from entry-point "Event Stream" )
> then
>     //nothing
> end
> and the following scenario:
> [miserable attempt at ascii art replaced by attached image]
> (an event at time T that start at T-1.5h and ends at T+1h)
> both of the above rules fire. im not sure which of them _should_ fire for this scenario, but im pretty sure its either one or the other (to my understanding the conditions are logically exclusive - there either exists an event in the window or there doesnt)

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