Design Pattern From Java To Ruby

Design Pattern -- from Java to Ruby
Richard
E kohe
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Why use Design Pattern
For reuse

For communication
www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Define a Node interface, all of leaf nodes and internal nodes should implements the interface, internal nodes has a list that includes other internal nodes and leaf nodes and it can add sub-nodes. But leaf node can’t have add sub-node method. Multi-level Menus?

For communication
www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Composite Pattern Multi-level Menus?

Difference from java to ruby
Classes are Objects
Messages, not function call
Duck Typing
Mixin

Singleton Pattern
ensures a class has only one instance, and provides a global point of access to it

Singleton Pattern www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development You are my only wife You are my only husband

Singleton Pattern -- java
Eager loading
Lazy loading

Singleton Pattern -- ruby
Ruby built-in singleton

Built-in (Singleton)
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Observer Pattern
defines a one-to-many dependency between objects so that when one object changes state, all of its dependents are notified and updated automatically

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Observer Pattern -- java www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development

Observer Pattern -- java
Java built-in observer

Observer Pattern -- ruby
Ruby built-in observer

Built-in (Singleton, Observer )
Mixin

Iterator Pattern
provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation

Iterator Pattern www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Count 1 2 3 10

Iterator Pattern -- java www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Merb - Offshore Web Development
External Iterator

Iterator Pattern -- java www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Merb - Offshore Web Development
Internal Iterator

Iterator Pattern -- ruby
Internal Iterator .each

Built-in (Singleton, Observer, Iterator )
Mixin

returns an instance of one of several possible classes, depending on the data provided to it.
www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Simple Factory Pattern

www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Simple Factory Pattern

www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Simple Factory Pattern -- java

Classes are Objects
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Built-in (Singleton, Observer, Iterator)‏
Mixin
Classes are Objects

encapsulates a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
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www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Command Pattern Increase temperature command Decrease temperature command

www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Command Pattern -- java

Proc
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Built-in (Singleton, Observer, Iterator)‏
Mixin
Classes are Objects
Proc

Make use of ruby advantage www.ekohe.com Web Development & Graphic Design China Ruby on Rails Development - Rails Consulting - Rails Services - Merb - Offshore Web Development Other Design Patterns

Principle
DRY – Don't Repeat Yourself
Convention Over Configuration

Resources
Design Pattern – Elements of Reusable Object-Oriented Software
Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides
Head First Design Pattern
Kathy Sierra, Bert Bates
Design Pattern in Ruby
Russ Olsen

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Design Pattern From Java To Ruby

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