Ruby使用設(shè)計模式中的代理模式與裝飾模式的代碼實例
代理模式
需求:
小明讓小李替他追小麗(送洋娃娃,送花,送巧克力)
沒有代理的代碼:
# -*- encoding: utf-8 -*- #追求者類 class Pursuit attr_accessor :mm def initialize(mm) @mm = mm end def give_dolls puts "#{mm.name} 送你洋娃娃" end def give_flowers puts "#{mm.name} 送你鮮花" end def give_chocolate puts "#{mm.name} 送你巧克力" end end #被追求者類 class Girl attr_accessor :name def initialize(name) @name = name end end xiao_hong = Girl.new('小紅') xiao_ming = Pursuit.new(xiao_hong) xiao_ming.give_dolls xiao_ming.give_flowers xiao_ming.give_chocolate
只有代理的代碼:
# -*- encoding: utf-8 -*- #代理類 class Proxy attr_accessor :mm def initialize(mm) @mm = mm end def give_dolls puts "#{mm.name} 送你洋娃娃" end def give_flowers puts "#{mm.name} 送你鮮花" end def give_chocolate puts "#{mm.name} 送你巧克力" end end #被追求者類 class Girl attr_accessor :name def initialize(name) @name = name end end xiao_hong = Girl.new('小紅') xiao_ming = Proxy.new(xiao_hong) xiao_ming.give_dolls xiao_ming.give_flowers xiao_ming.give_chocolate
只是把追求者類換成了代理類。
實際的代理模式代碼:
# -*- encoding: utf-8 -*- #公共接口module module GiveGift def give_dolls end def give_flowers end def give_chocolate end end #追求者類 class Pursuit include GiveGift attr_accessor :mm, :name def initialize(mm) @mm = mm end def give_dolls puts "#{mm.name} 替#{name}送你洋娃娃" end def give_flowers puts "#{mm.name} 替#{name}送你鮮花" end def give_chocolate puts "#{mm.name} 替#{name}送你巧克力" end end #代理類 class Proxy include GiveGift attr_accessor :gg def initialize(mm) @gg = Pursuit.new(mm) end def give_dolls gg.give_dolls end def give_flowers gg.give_flowers end def give_chocolate gg.give_chocolate end end #被追求者類 class Girl attr_accessor :name def initialize(name) @name = name end end xiao_hong = Girl.new('小紅') xiao_ming = Proxy.new(xiao_hong) xiao_ming.gg.name = '小明' xiao_ming.give_dolls xiao_ming.give_flowers xiao_ming.give_chocolate
裝飾模式
需求:
給人搭配不同的服飾
代碼版本一
# -*- encoding: utf-8 -*- class Person attr_accessor :name def initialize(name) @name = name end def wear_t_shirts puts '大T恤' end def wear_big_trouser puts '垮褲' end def wear_sneakers puts '破球鞋' end def wear_suit puts '西裝' end def wear_tie puts '領(lǐng)帶' end def wear_leather_shoes puts '皮鞋' end def show puts "*****裝扮的#{name}\n\n" end end xc=Person.new('小菜') puts "******第一種裝扮" xc.wear_t_shirts xc.wear_big_trouser xc.wear_sneakers xc.show puts "******第二種裝扮" xc.wear_suit xc.wear_tie xc.wear_leather_shoes xc.show
這樣寫的話,功能是實現(xiàn)了,問題是如果增加“超人”的裝扮,就要修改Person類,違反了開放-封閉原則。
代碼版本二
# -*- encoding: utf-8 -*- class Person attr_accessor :name def initialize(name) @name = name enddef show puts "*****裝扮的#{name}\n\n" end end class Finery def show end end class TShirts < Finery def show puts '大T恤' end end class BigTrouser < Finery def show puts '垮褲' end end class Sneakers < Finery def show puts '破球鞋' end end class Suit < Finery def show puts '西裝' end end class Tie < Finery def show puts '領(lǐng)帶' end end class LeatherShoes < Finery def show puts '皮鞋' end end xc=Person.new('小菜') ts = TShirts.new bt = BigTrouser.new sk = Sneakers.new puts "******第一種裝扮" ts.show bt.show sk.show xc.show suit = Suit.new tie = Tie.new ls = LeatherShoes.new puts "******第二種裝扮" suit.show tie.show ls.show xc.show
這樣改了之后,如果增加超人裝扮,確實不需要去修改Person類。存在的問題是,各種衣服是獨立的,并且暴露在外邊的,就是一件一件穿的,沒有順序,沒有控制。
代碼版本三
# -*- encoding: utf-8 -*- class Person attr_accessor :name def initialize(name=nil) @name = name end def show puts "*****裝扮的#{name}\n\n" end end class Finery < Person attr_accessor :componet def decorate(componet) @componet = componet end def show componet.show if componet end end class TShirts < Finery def show super puts '大T恤' end end class BigTrouser < Finery def show super puts '垮褲' end end class Sneakers < Finery def show super puts '破球鞋' end end class Suit < Finery def show super puts '西裝' end end class Tie < Finery def show super puts '領(lǐng)帶' end end class LeatherShoes < Finery def show super puts '皮鞋' end end xc=Person.new('小菜') ts = TShirts.new bt = BigTrouser.new sk = Sneakers.new puts "******第一種裝扮" ts.decorate xc bt.decorate ts sk.decorate bt sk.show suit = Suit.new tie = Tie.new ls = LeatherShoes.new puts "******第二種裝扮" suit.decorate xc tie.decorate suit ls.decorate bt ls.show
相關(guān)文章
Ruby中創(chuàng)建字符串的一些技巧小結(jié)
這篇文章主要介紹了Ruby中創(chuàng)建字符串的一些技巧小結(jié),本文用先講解技巧然后給出代碼示例的方式列出了多種Ruby創(chuàng)建字符串方法,需要的朋友可以參考下2015-01-01淺談Ruby on Rails下的rake與數(shù)據(jù)庫數(shù)據(jù)遷移操作
Rails中的Migration相對來說更適合做數(shù)據(jù)庫的對象集合操作,而自動化的rake則是一個較好的選擇,下面來淺談Ruby on Rails下的rake與數(shù)據(jù)庫數(shù)據(jù)遷移操作,需要的朋友可以參考下2016-06-06Linux系統(tǒng)上配置Nginx+Ruby on Rails+MySQL超攻略
這篇文章主要介紹了Linux系統(tǒng)上配置Nginx+Ruby on Rails+MySQL超攻略,用到了RVM,此種服務器搭建配置極力推薦!需要的朋友可以參考下2015-08-08