Re: [rules-users] Inferencing
Hi Tim,
That is a nice topic for studies, but be prepared for a tsunami of
information and quite a few controversies. :)
Regarding your question, I am not sure I completely understand what you
mean, but it is important to be clear that "generation of code" is an
orthogonal concern to the chosen algorithm. I.e., take the Rete algorithm
for example: you can have it fully "interpreted" (I am using the term
loosely here), you can generate code for it completely, or you can be
anywhere in the middle. In all cases, the properties of the algorithm itself
will be preserved (assuming the implementations are correct). Incurring the
risk of making a mistake here, I will mention that AFAIK Jess falls in the
first cathegory, OPSJ falls in the second and Drools falls in the 3rd, and
they are all Rete based algorithms.
Its been a long time since I last looked at TAKE, but at that time it was
generating code for a backward-chaining-like algorithm. Not sure what it has
now.
So, my suggestion is that you either focus on the properties of the
algorithms itself (for instance, are you comparing classic Rete with known
algorithm like LEAPS, TREAT, etc) or focus on the advantages and
disadvantages of code generation (for instance "interpreted Rete" versus
"code generated Rete", again using terms loosely here). Mixing everything in
a single comparison might be misleading.
Edson
2010/3/8 Tim de Jager <tim.dejager(a)student.hu.nl>
Hi everybody,
I'm currently doing my bachelor thesis on Rule engines. This includes
comapring different Rule engine products. I have set up a small Java
program
(Conway's game of life) and I'm writing the 'engine' in different Rule
engines, while keeping the same GUI,CellGrid etc. I have already made a
Drools based engine.
I have been studying the Rule engine subject for somewhat more then a month
now. And I'm currently seeing two different developments namely the use of
an inference engine and the generation of embedded code instead (Take,
Visual Rules etc.) I can see some of the pro's and cons with both
paradigms. But I'm wondering what opinion some of you guys have on the
subject.
I can see that without inferencing it is very hard (or even impossible) to
keep a statefull session inside the rule engine, haven't seen a
non-inferencing rule engine which does offer this possibility. And also
lose
features like TMS. But what would be a concrete example where a statefull
session is absolutely necessary? Instead of letting the engine reason over
all the facts in stateless way. And managing conflicts with a ruleflow (see
Visual Rules for a nice example).
I'm looking forward to hearing your thoughts.
Thanks,
Tim
P.S I already read two of Mark Proctors blogs on inferencing, but while
enlightening, they didn't supply me with a definitive awnser
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Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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