Re: [rules-users] Re: Production rules vs. ECA Rules
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(a)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-...
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(a)codehaus.org>
Subject: Re: [rules-users] Production rules vs. ECA Rules
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID: <46AE2C03.8090701(a)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(a)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
>
>
>