Upgrade to Pro — share decks privately, control downloads, hide ads and more …

State Pattern From GoF

Sponsored · SiteGround - Reliable hosting with speed, security, and support you can count on. →
Avatar for Chris Bushell Chris Bushell
July 07, 2010
Programming
79
1

State Pattern From GoF

Prepared for the Melbourne Patterns Group

Avatar for Chris Bushell

Chris Bushell

July 07, 2010

More Decks by Chris Bushell

See All by Chris Bushell
Test Automation for Packaged Systems: Yes You Can!
Avatar for Chris Bushell cbushell
0
87
Introduction to Pair Programming
Avatar for Chris Bushell cbushell
1
140
An Introduction to BDD
Avatar for Chris Bushell cbushell
5
190
An Introduction to HTTP
Avatar for Chris Bushell cbushell
2
140
Agile Test Automation
Avatar for Chris Bushell cbushell
2
200
Working Effectively With Legacy Code
Avatar for Chris Bushell cbushell
4
260
Jasmine, BDD for JavaScript
Avatar for Chris Bushell cbushell
1
140
Branches Are For Trees. How to Develop Software Without Them
Avatar for Chris Bushell cbushell
1
130
Continuous Integration, fast builds and Flot
Avatar for Chris Bushell cbushell
2
86

Other Decks in Programming

See All in Programming
わからない話を追いかけたら、プログラミング言語を作る側にいた
Avatar for ydah ydah
3
480
Apache Hive: Toward a Cloud Native Lakehouse
Avatar for okumin okumin
0
180
夏だ！祭りだ！祭りとはドメインモデリングでは？
Avatar for ryugen04 ryugen04
0
200
作るコストが小さくなった時代 幸せに働くために改めて考えたいこと 〜エンジニアとして価値を出し続けるために注視している二分野〜
Avatar for YuppeEng yuppeeng
0
190
<title><a id="</title>君はこのHTMLをパースできるか"></a></title> #雑LT_study
Avatar for pizzacat83 pizzacat83
0
140
Android CLI
Avatar for Sungyong An fornewid
0
210
AWS DevOps AgentのAzure接続機能を検証して見えた活用法／Use Cases Verified for the AWS DevOps Agent's Azure Connectivity Feature
Avatar for モブエンジニア（Masaki Okuda） masakiokuda
1
220
AI時代、エンジニアはどう育つのか -未経験エンジニアの成長を間近で見て考えたこと-
Avatar for ta-hasunuma thasu0123
0
220
torikago - Ruby::Boxで照らすモジュラモノリスの実行境界
Avatar for nori se4weed
1
350
Terraform標準の組織で AWS CDKをどう使うか
Avatar for mu7889yoon / Yuta Nakamura mu7889yoon
1
500
the container ship “Apple Silicon”@WWDC26 Recap -Japan-\(region).swift
Avatar for gangan shingangan
0
110
PostgreSQL 18で考えるUUID主キー
Avatar for Kazuhiro Seo kazuhiro1982
0
460

Featured

See All Featured
RailsConf 2023
Avatar for Aaron Patterson tenderlove
30
1.5k
The Art of Delivering Value - GDevCon NA Keynote
Avatar for David Neal reverentgeek
16
2.1k
The Mindset for Success: Future Career Progression
Avatar for Greg Gifford greggifford
PRO
0
440
Fantastic passwords and where to find them - at NoRuKo
Avatar for Phil Nash philnash
52
3.8k
Building Flexible Design Systems
Avatar for Yesenia Perez-Cruz yeseniaperezcruz
330
40k
Paper Plane
Avatar for Katie Cordina Lindsey katiecoart
PRO
2
52k
Technical Leadership for Architectural Decision Making
Avatar for Kenny Baas-Schwegler baasie
3
470
HDC tutorial
Avatar for Michiel Stock michielstock
2
790
Reflections from 52 weeks, 52 projects
Avatar for Jefferson Lam jeffersonlam
356
21k
Primal Persuasion: How to Engage the Brain for Learning That Lasts
Avatar for Mike Taylor tmiket
0
400
How to build a perfect <img>
Avatar for Jono Alderson jonoalderson
1
5.9k
Embracing the Ebb and Flow
Avatar for Simon Collison colly
88
5.1k

Transcript

  1. State  Pa'ern  From  GoF   Chris  Bushell  7th  July  2010

       

  2. Mo<va<on   “Allow  an  object  to  alter  its  behavior  when

     its   internal  state  changes”  

  3. Code  

  4. Applicability   •  Behavior  depends  on  state   •  Opera<ons

     have  large  condi<onal  statements   which  depend  on  state  

  5. Par<cipants  

  6. Collabora<ons   •  Context  and  Concrete  State   •  Context

     is  primary  interface  for  clients  

  7. Consequences   •  Localizes  state  specific  behavior.  Avoids  code  

    duplica<on   •  State  changes  are  well  defined,  atomic   opera<ons   •  State  objects  can  be  shared  

  8. Implementa<on   •  Context  or  Concrete  State  defines  transi<ons?  

    •  Table  based  approach  to  defining  transi<ons   •  Singleton,  Flyweight