CodePattern/15 工程化/1 复用/对象复用.py

# 创建对象是消耗资源的，如果发现对象已经存在，可以返回引用，不创造新对象 。设计模式中这个做法叫享元
from cppy.cp_util import *

#享元类
class WordFrequencyController():
    def __init__(self, controllertype,filepath ):
        word_list = extract_file_words(filepath)
        word_freq = get_frequencies(word_list)
        self.word_freq = sort_dict(word_freq)
        self.number = controllertype
    def print_word_freqs( self ):
        print_word_freqs( self.word_freq,self.number)        

#享元工厂
class WordFrequencyControllerFactory():
    def __init__(self):
        self.types = {}

    def get_WordFrequencyController(self, number,testfilepath):
        if number not in self.types:
            self.types[number] = WordFrequencyController(number,testfilepath) # 创建新的对象
            print('new obj: ','*'*30,number)                        
        else:
            print('ref obj: ','*'*30,number)
        return self.types[number] # 重复使用已存在的对象


if __name__ == "__main__":
    factory = WordFrequencyControllerFactory()
    for number in [ 1,3,5,3,5,7 ]:
        WordFrequency = factory.get_WordFrequencyController(number,testfilepath)
        # print(flush=True)
        WordFrequency.print_word_freqs()