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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ## 策略設計模式 ### 構成 1. 抽象策略; 2. 具體策略,即實現; 3. 上下文——策略調度。 #### 優點 定義了一系列可重用的算法和行為; 消除了一些條件語句; 可以提供相同行為的不同實現。 #### 缺點 客戶必須了解不同的策略以選擇使用。 ### 示例代碼 ``` from abc import ABCMeta,abstractmethod class Strategy(metaclass=ABCMeta): @abstractmethod def execute(self, data): pass class FastStrategy(Strategy): def execute(self, data): print("用較快的策略處理%s" % data) class SlowStrategy(Strategy): def execute(self, data): print("用較慢的策略處理%s" % data) # 上下文類,負責策略的調度 class Context: def __init__(self, strategy, data): self.data = data self.strategy = strategy def set_strategy(self, strategy): self.strategy = strategy def do_strategy(self): self.strategy.execute(self.data) data = "L:" s1 = FastStrategy() s2 = SlowStrategy() context = Context(s1, data) context.do_strategy() """切換策略""" context.set_strategy(s2) context.do_strategy() ```
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