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ZOMBIEAPPS Javier Acero jacegu jacegu javieracero.com

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1 2 3 BUSINESS LOGIC DATA SOURCES PRESENTATION

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1 2 3 Busine Logic

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Business Logic is a non-technical term generally used to describe the functional algorithms that handle information exchange between a database and a user interface. - Wikipedia

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Business Logic is a non-technical term generally used to describe the functional algorithms that handle information exchange between a database and a user interface. - Wikipedia oh boy...

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- Martin Fowler, Patterns of Enterprise Application Architecture Business Logic is the work the application needs to do for the domain it’s working with.

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CALCULATIONS VALIDATIONS CALLS TO EXTERNAL SYSTEMS + + = BUSINESS LOGIC

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SCRIPT TRANSACTION

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TRANSACTIONS busine logic a

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PROCEDURES modeled a def newPurchase() DB.insert(); commit(); end

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simple easy to understand works great with simple datasources makes transaction boundaries visible 00 { ADVANTAGES

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00 {duplicated code procedural code duplicated code procedural code duplicated code procedural code duplicated code procedural code ADVANTAGES DIS

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duplicated code get wo e a the a lication gro time

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MODULE TABLE

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OPERATIONS busine logic a TABLE ROWS on

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OBJECTS modeled a class Product { def purchase(); recordSets(); RECORD SETS & class RecordSet {

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avoids duplication better than a transaction script 00 { ADVANTAGES helps overcoming the relational - oo mismatch

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00 { ADVANTAGES DIS modeling limited by and tied to the data model mechanisms basic to OOP like polymorphism are not available

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MODEL DOMAIN

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OBJECT busine logic a BEHAVIOUR

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OBJECT GRAPHS modeled a Product Price Stock ProductService ProductRepository

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- Martin Fowler, Patterns of Enterprise Application Architecture The Object Oriented way of implementing business logic.

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ADVANTAGES - Martin Fowler, Patterns of Enterprise Application Architecture The Object Oriented way of implementing business logic.

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00 {the hardest to comprehend data sources get more complex overhead for simple business logic ADVANTAGES DIS

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effort to enhance complexity of the business logic domain model table module transaction script

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effort to enhance complexity of the business logic domain model table module transaction script 7.42

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Programming What about... eXtreme

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OOP SOLID DESIGN PATTERNS REFACTORING

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UBIQUITOUS LANGUAGE

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.........F...... ................ .....TESTING..... ......F......... ....**...F..F...

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ANEMIC antipa ern DOMAIN MODEL

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antipa ern DOMAIN MODEL DRIVEN TABLE

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antipa ern DOMAIN MODEL CONNECTED

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DOMAIN MODEL BUILD Ho t ... A RICH

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BBBBRRRRR RAAAAIIILS

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Thank You

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QUESTIONS?

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The icons and images used in this presentation were found using Google and belong to their respective authors. The Database Slide was taken from @unclebob’s talk at Ruby Midwest 2011 Credit

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Here is where I found them: Credit Spaghetti: http://goo.gl/KrGiL Zombie 1: http://goo.gl/mHiYe Zombie 2: http://goo.gl/hk8i0 Zombie Apocalypse: http://goo.gl/7IIK6 Tool: http://goo.gl/75Svb