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&gt; > Subject: Re: [rules-users] Production rules vs. ECA Rules > To: Rules Users List <rules-users(a)lists.jboss.org&gt; > Message-ID: <46AE2C03.8090701(a)codehaus.org&gt; > 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 >> >> >> > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users