#ORF09 Production Rule Systems

This entry is part 9 of 30 in the series October Rules Fest 2009

Mark Proctor gave a talk on where he sees things going in the future of rule systems.

He obviously gave a very brief introduction of Drools and then went on to presenting a “brain dump” of ideas he has been thinking about.

In Drools, he would like to see:

  • More expressiveness to support nested accessors
  • Supporting method calls (not simple to resolve)
  • Support for an else
  • Logical Closure
  • Logical Modify
  • Duration, Repetition and Cron
  • Execution Groups (Agenda Groups, Ruleflow Groups, Activation Groups)
  • Meta-Rules for controlling which rules would fire, controlling the order, etc.
  • How to make a large stateful rule engine (which requires persistence) as opposed to using stateless rule engines (Multi-Version Concurrency Control). Basically how to add functionality similar to some of the databases to allow transactions, rollbacks, etc. and allow stateful rule engines
  • Positional Slotted Language (POSL?), basically provide a rule engine that can support hybrid structure for slotted and positional rule language. (The examples he gave us here were helpful in understand what he has in mind)
  • Federated queries

Based on Mark’s presentation, we can expect Drools to have some of the functionality that other rule engines have or new syntax that would simplify the rule writing.

Some of the concepts he introduced are still fairly abstract and dry, but they show that one of the key people behind Drools is really thinking forward to where things can go next.

[Update]

Mark later posted his presentation on his blog. You can find it at: http://blog.athico.com/2009/10/drools-where-do-we-go-from-here-orf09.html

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