Object Oriented Architecture and Design

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Object Oriented Architecture and Design

• OOP Theresa Devine

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The problem with words

• Grady booch

• SG Ganesh

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Clarity

• They both agree about abstraction and
  encapsulation
• Booch
• Modularity
• Hierarchy
• Ganesh
• Inheritance
• Polymorphism

• Booch has a higher view in his choice of words
• Ganesh is a bit more practical

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3 Fundamentals of Object-Oriented Paradigm

• Encapsulation - a class includes both the data
  and operations that operate on the data. It can
  hide the implementation details.
• A user of the class only sees the public
  interface.
• You use the concepts of abstraction, modularity
  and hierarchy to create this.
• Polymorphism - many classes can perform the same
  behavior and we can use them interchangeably.
• You use abstraction, modularity, encapsulation
  and inheritance to create this
• Inheritance - one class can build on top of
  another class and inherit all its methods and
  attributes.
• You are using abstraction, modularity and
  hierarchy to create this

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Modularity and abstraction
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Hierarchy and Layers
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The first practical application of the theory
Layers
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Right click gt Add gt New Folder
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You have added Layers to your class library
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Definitions
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Example website
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Here is an example of a web page making a call to
create an invitation
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Add entities (these are what you have been
making)
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Add the logic layer class
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Add communication layer class
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Review Namespaces

• Namespaces allow you to create a system to
  organize your code.
• Namespaces are hierarchical
• The dot operator is used to define the hierarchy

• Examples
• MyEngineWithLayers.Logic.Invitation
• MyEngineWithLayers.Communication.Invitation
• MyEngineWithLayers.Entity.Invitation
• MyEngineWithLayers.DataAccess.Invitation
• Dot Operator
• Logic.Invitation is actually shorthand for
  defining a namespace named Invitation that
  contains a namespace named Logic
• You invoke a method on class by writing the name
  of the object followed by the dot operator and
  then the method name

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Let add a test project and see our layers
working. (also add reference, import namespace)
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Test method
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Run the test
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Debug
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Test results