[rules-users] Re: Production rules vs. ECA Rules

[Mark Proctor]

If anyone is interestined in creating a drools-eca extension module, to 
allow for ECA style event creation and handling, let me know, as its 
definitely something we would like to support.

Mark
Tomas Olsson wrote:
> Hi,
>
> I think one can say that in ECA there is a conceptually difference 
> between events and conditions. Events are modeled explicitly as a 
> separate concept outside the condition part. This can be
> a nice for modeling since you can separate the "event" that triggers
> rule execution from the internal conditions that governs what rules to
> execute. I have a paper that describes an SLA evaluator in terms of ECA
> implemented with Drools 2:
> http://www.sics.se/spot/document/QoS_using_SLA.pdf (see page 8). In
> short: the evaluator receives notifications and scheduled executions as
> events and reacts to them.
>
> Thus you can use JBoss Drools to implement ECA but you have to create
> the event model yourself. In an ECA engine this is already done for you
> and you get a language to somehow express the events.
>
> /Tomas
>
> qmars765 at gmx.de wrote:
>> Hi Mark,
>>
>> in which constellations i should select ECAs? What is the difference 
>> between events in ECAs and the occurrence of a certain set of facts 
>> in WorkingMemory in case of production rules?
>>
>> In following document they classify ECAs and production rules both as 
>> reactive rules, but they state they are somehow different:
>>
>> http://www.pms.ifi.lmu.de/publikationen/PMS-FB/PMS-FB-2007-8/PMS-FB-2007-8-reactive-rules-on-the-web.pdf 
>>
>>
>> And they state that JBoss Rules is only for production rules.  So can 
>> I use JBoss Rules for implementing ECAs?
>> Thanks and best regards,
>>
>> Kioumars
>>
>>
>> Date: Mon, 30 Jul 2007 19:20:51 +0100
>> From: Mark Proctor <mproctor at codehaus.org>
>> Subject: Re: [rules-users] Production rules vs. ECA Rules
>> To: Rules Users List <rules-users at lists.jboss.org>
>> Message-ID: <46AE2C03.8090701 at codehaus.org>
>> Content-Type: text/plain; charset=UTF-8; format=flowed
>>
>> ECA is really a specialised subset of Product Rules; focusing more on
>> generic event generation and event handling.
>>
>> Mark
>> qmars765 at gmx.de wrote:
>>  
>>> Dear List,
>>>
>>> In JBoss Rules documentation it is written that they can be used for 
>>> production rules. But I frequently read also in other sources about 
>>> ECA rules.
>>>
>>> Is there any significant difference between “ECA† and 
>>> “Production† Rules?
>>> If yes, what?
>>>
>>> Thanks in advance for your feedback and best Regards,
>>>
>>> Kioumars
>>>
>>>
>>>     
>>
>>   
>
>
>
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