BRM 2012 (Decision Tables)

Decision TablesMichael AnstisCore Developer, Red Hat8th March 2012

Agenda What are they? A little theory Guvnor Demo2

What are they? http://images.wellcome.ac.uk/indexplus/image/V0041734.html3

What are they? Simply a table "Decision tables are a precise yet compact way to model complicated logic." wikipedia Easily understood by humans Enable quick and easy analysis4

What are they? http://commons.wikimedia.org/wiki/File:Formal_Place_Setting_12_Course_Dinner.jpg5

What are they? Sections Conditions Condition states stub Actions Action states stub Rule identifiers6

What are they? Layouts - horizontal7

What are they? Layouts - vertical8

A little theory Extended Entry9

A little theory Limited Entry10

A little theory http://www.flickr.com/photos/ctbto/4926598654/in/photostream/11

A little theory Expanded form Guarantee of completeness Rule for every combination of conditions The number of columns should equal the product of the number of states for every condition.12

A little theory http://www.flickr.com/photos/marcovdz/4520986339/in/photostream/13

A little theory Contracted form Contraction is the first optimization Stage 1 – impossible matches Stage 2 – merge condition states14

A little theory Contraction – impossible conditions15

A little theory Contraction – merge condition states16

A little theory http://www.flickr.com/photos/worldseriesboxing/6334574625/sizes/z/in/photostream/17

A little theory Multiple, all hits Given a 35 year old with 15 years service 1. Rule 1 matches, giving 22 days 2. Rule 5 matches, giving an additional 3 days 3. A total of 25 days is assigned Supported by default in Drools18

A little theory Multiple, first hit Given a 35 year old with 15 years service 1. Rule 4 matches, giving 25 days 2. Rule 6 would match but Rule 4 was the first hit Can be emulated with Drools using Control Facts19

A little theory Single hit Given a 35 year old with 15 years service 1. Rule 3 matches, giving 25 days 2. No other rules match20

A little theory http://www.flickr.com/photos/kmakice/4713798045/sizes/m/in/photostream/21

A little theory Validation and verification Completeness Redundancy Conflict Deficiency22

Guvnor23

Guvnor Flexible authoring environment Extend or Limited Entry Automatic expansion V&V Import from Excel24

And now for something completely different...25

BRM 2012 (Decision Tables)

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BRM 2012 (Decision Tables) Presentation Transcript