[rules-users] About fusion and collections

[Amit Kumar]

Kewl !.. sounds good. Thanks for your help folks. I will try the options
out.

2010/3/15 Edson Tirelli <ed.tirelli at gmail.com>

>
>    Amit,
>
>    Check fireUntilHalt() docs in order to set the engine to reactive
> mode... although, for most cases I've seen, you still have more control by
> defining the fireAllRules() cycle explicitly.
>
>    Regarding your rule, the problem is that the first type is matched for
> multiple events. The simplest way to fix that is by pre-populating the
> working memory with all possible event types. In this case you would use a
> rule like:
>
> when
>     EventType( $type : type )
>
>     $events: ArrayList (size > 10)
>             from collect (Event(eventType == $type))
> then
>     // do something
> end
>
>    You can also find the distinct event types using accumulate, but that is
> heavier and more complex than the previous example. Lets say event type is a
> String:
>
> when
>     $types : Set()
>          from accumulate( Event($type : eventType),
>                                    collectSet( $type ) )
>     $type : String() from $types
>
>     $events: ArrayList (size > 10)
>             from collect (Event(eventType == $type))
> then
>     // do something
> end
>
>    I don't really recommend the second approach though. An intermediate
> approach is to have a separate rule logically insert all event types, and
> then use the same approach of the first example above:
>
> declare EventType
>     type : String @key
> end
>
> when
>     Event( $type : eventType )
> then
>     EventType et = new EventType();
>     et.setType( $type );
>     logicalInsert( et );
> end
>
>    []s
>    Edson
>
>
>  2010/3/15 Amit Kumar <amitkumar at gmail.com>
>
>> Hello All,
>>
>>
>> Was doing some rule writing and am seeing some issues which I want to
>> overcome.
>>
>> In Fusion when we send the facts into working memory.. there seems to be
>> no way that rules are automatically getting triggered.
>> We have to call fireAllRules after each fact insertion. Is this the way it
>> was designed. Its like this in the stocktick example also
>>
>> This one should be simple for somebody with little more experience than me
>> In the following rule
>>
>> rule "raise alarm"
>> when
>>   Event($type : eventType)
>>   $events: ArrayList (size > 10)
>>             from collect (Event(eventType == $type))
>> then
>>   raise alarm
>>
>> In the above rule the raise alarm is getting called 10 times. .. How can I
>> make it to be called only once.
>>
>> Thanks
>> Amit
>>
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>> rules-users at lists.jboss.org
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>>
>>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss by Red Hat @ www.jboss.com
>
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