Domain Model Pattern

What is it?

• Using an OO way instead of procedural in transaction pattern

  • objects have state and behaviour

• Build model of domain as objects

• interconnected objects

• Any validation or calculation related to an object is placed in the object

• Delegates work to different objects

• Use of polymorphism to handle different buisness rules

• Use a template or strategy pattern to bring everything together

Advantages

• Handles more complexity

• Avoid more conditionals, and adding more objects (polymorphism)

Disadvantages

• lots of indirection, hard to see flow of logic

• complex data mapping

• object bloat

• Need to model domain in different layers