Python: Flyweight Pattern

DuFlyweight.py

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# 享元模式 Flyweight Pattern  geovindu,Geovin Du,涂聚文 import time   class Arrow:     def __init__(self, x, y, z, velocity):         self.x = x         self.y = y         self.z = z         self.velocity = velocity         self.shape = 'cone'     class ArrowContext:     def __init__(self, x, y, z, velocity):         self.x = x         self.y = y         self.z = z         self.velocity = velocity     class ArrowFlyweight:     def __init__(self):         self.shape = 'cone'         self.arrows = []       def arrow_factory(self, x, y, z, velocity):         arr = []         for b in self.arrows:             if b.x == x and b.y == y and b.z == z and b.velocity == velocity:                 arr.append(b)         if not arr:             arr = Arrow(x, y, z, velocity)             self.arrows.append(arr)         else:             arr = arr[0]           return arr       def print_arrows(self):         print('排列:')         for arrow in self.arrows:             print(str(arrow.x) + ' ' + str(arrow.y) + ' ' + str(arrow.z) + ' ' + str(arrow.velocity))     # Flyweight Object: HTTP Request result:  geovindu,Geovin Du,涂聚文 格式，排版要对齐，否则调用时，方法到提取不到 class WebRequestResult(object):    # The time (in munutes, converted to seconds) to cache a request.    # This is a 1-minute cahce.    CACHE_TIME_MINUTES = 1 * 60      def __init__(self, data):        # The Flyweight data:        self.data = data        self.cacheUntilTime = time.time() + WebRequestResult.CACHE_TIME_MINUTES      def isExpired(self):        return time.time() > self.cacheUntilTime   # WebRequestCache Factory: class WebRequestCache(object):     def __init__(self):         self.cache = {}       # For simplicity, we'll be concurrent with our requests:     def getRequest(self, url):         result = None           if url in self.cache:             result = self.cache[url]           if result is None or result.isExpired():             result = WebRequestResult("一些数据来自于 " + str(url))               self.cache[url] = result           return result

　　

main.py  调用

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# 享元模式 Flyweight Pattern   obj =DuFlyweight.ArrowFlyweight() obj.arrow_factory(1, 1, 1, 1) obj.arrow_factory(1, 2, 5, 1) obj.arrow_factory(1, 1, 1, 1) obj.print_arrows()   geovinduObject =DuFlyweight.ArrowFlyweight() geovinduObject.arrow_factory('geovindu', 'dusystem.com', '1', '塗聚文') geovinduObject.arrow_factory('geovin', 'du', '5', '1') geovinduObject.arrow_factory('geovi', 'studio', '1', '涂聚文') geovinduObject.print_arrows()   webCache = DuFlyweight.WebRequestCache()   request = webCache.getRequest("https://coronavirus-tracker-api.herokuapp.com/all") print(request.data) # output: Some cool data from mycoolapi/endpoint   print(request.isExpired()) # output: False

　　

 

输出：

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排列: 1 1 1 1 1 2 5 1 排列: geovindu dusystem.com 1 塗聚文 geovin du 5 1 geovi studio 1 涂聚文 一些数据来自于 https://coronavirus-tracker-api.herokuapp.com/all False