#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'Andy'
"""
大話設(shè)計(jì)模式
設(shè)計(jì)模式——享元模式
享元模式(Flyweight Pattern):運(yùn)用共享技術(shù)有效地支持大量細(xì)粒度的對(duì)象
對(duì)一個(gè)類進(jìn)行的實(shí)例,只在第一次使用時(shí)建立,其他時(shí)候是用同一個(gè)實(shí)例,減少內(nèi)存的開銷
"""
# 抽象網(wǎng)站類
class Website(object):
  def use(self):
    pass
# 具體網(wǎng)站類
class ConcreteWebsite(Website):
  def __init__(self, name):
    self.name = name
  def use(self):
    print "網(wǎng)站分類",self.name
# 不共享的網(wǎng)站類
class UnshareConcreteWebsite(Website):
  def __init__(self, name):
    self.name = name
  def use(self):
    print "不共享網(wǎng)站分類",self.name
# 網(wǎng)站工廠
class WebsiteFactory(object):
  def __init__(self):
    self.hashtable = dict()
  # 獲取網(wǎng)站類 如果存在直接返回,如果不存在建好之后返回
  def get_website(self, key):
    if not key in self.hashtable:
      self.hashtable[key] = ConcreteWebsite(key)
    return self.hashtable[key]
  # 網(wǎng)站實(shí)例的個(gè)數(shù)
  def get_website_count(self):
    return len(self.hashtable.keys())
if __name__ == "__main__":
  factory = WebsiteFactory()
  f1 = factory.get_website("blog")
  f2 = factory.get_website("blog")
  f3 = factory.get_website("blog")
  f4 = factory.get_website("website")
  f5 = factory.get_website("website")
  f6 = factory.get_website("website")
  f7 = UnshareConcreteWebsite("test")
  f1.use()
  f2.use()
  f3.use()
  f4.use()
  f5.use()
  f6.use()
  f7.use()