147 lines
3.4 KiB
Python
147 lines
3.4 KiB
Python
"""
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实例：
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汤宝宝成为一国之王，手下有一个传令官和三个大臣，分别是内政大臣、外交大臣和军事大臣。
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有一天，汤宝宝想要发布一个命令，传令官负责将命令传达给大臣们，大臣们根据命令的内容决定是否执行。
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"""
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from abc import ABC, abstractmethod
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# 接收者接口
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class Receiver(ABC):
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@abstractmethod
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def perform(self):
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pass
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def abort(self):
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pass
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# 内政大臣
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class HomeSecretary(Receiver):
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is_performing: bool
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def __init__(self):
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self.is_performing = False
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def perform(self):
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self.is_performing = True
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print("内政大臣开始执行命令")
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def abort(self):
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self.is_performing = False
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print("内政大臣取消执行命令")
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# 外交大臣
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class ForeignSecretary(Receiver):
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is_performing: bool
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def __init__(self):
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self.is_performing = False
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def perform(self):
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self.is_performing = True
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print("外交大臣开始执行命令")
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def abort(self):
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self.is_performing = False
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print("外交大臣取消执行命令")
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# 军事大臣
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class DefenseSecretary(Receiver):
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is_performing: bool
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def __init__(self):
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self.is_performing = False
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def perform(self):
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self.is_performing = True
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print("军事大臣开始执行命令")
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def abort(self):
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self.is_performing = False
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print("军事大臣取消执行命令")
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# 命令接口
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class Command(ABC):
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@abstractmethod
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def execute(self):
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pass
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# 执行命令
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class performCommand(Command):
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receiver: Receiver
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def __init__(self, receiver: Receiver):
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self.receiver = receiver
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def execute(self):
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self.receiver.perform()
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# 取消命令
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class abortCommand(Command):
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receiver: Receiver
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def __init__(self, receiver: Receiver):
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self.receiver = receiver
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def execute(self):
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self.receiver.abort()
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# 传令官
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class Herald:
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commands: list[Command]
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def __init__(self):
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self.commands = []
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def addCommand(self, command: Command):
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self.commands.append(command)
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def executeCommands(self):
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for command in self.commands:
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command.execute()
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self.commands.clear()
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if __name__ == "__main__":
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print("========= 命令模式 =========")
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# 创建接收者
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home_secretary = HomeSecretary()
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foreign_secretary = ForeignSecretary()
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defense_secretary = DefenseSecretary()
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# 创建命令
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perform_home_command = performCommand(home_secretary)
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perform_foreign_command = performCommand(foreign_secretary)
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perform_defense_command = performCommand(defense_secretary)
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abort_home_command = abortCommand(home_secretary)
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abort_foreign_command = abortCommand(foreign_secretary)
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abort_defense_command = abortCommand(defense_secretary)
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# 创建传令官
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herald = Herald()
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# 添加执行命令
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herald.addCommand(perform_home_command)
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herald.addCommand(perform_foreign_command)
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herald.addCommand(perform_defense_command)
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# 执行命令
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herald.executeCommands()
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# 添加取消命令
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herald.addCommand(abort_home_command)
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herald.addCommand(abort_foreign_command)
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herald.addCommand(abort_defense_command)
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# 执行取消命令
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herald.executeCommands()
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print("\n======= 命令模式结束 =======") |