实现中介者模式示例，添加中介者、同事类及具体实现，增强代码可读性

2026-01-06 18:29:49 +08:00
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+"""
+实例：
+汤宝宝一时想不开，当了房产中介。
+他负责把房东和租客撮合在一起，帮他们达成租房协议。
+"""
+
+from abc import ABC, abstractmethod
+
+
+# 抽象同事类
+class Colleague(ABC):
+    @abstractmethod
+    def send(self, event: str) -> None:
+        pass
+
+    @abstractmethod
+    def receive(self, event: str) -> None:
+        pass
+
+
+# 抽象中介者
+class Mediator(ABC):
+    @abstractmethod
+    def notify(self, sender: Colleague, event: str) -> None:
+        pass
+
+    @abstractmethod
+    def register(self, colleague: Colleague) -> None:
+        pass
+
+
+# 具体同事类：房东
+class Landlord(Colleague):
+    mediator: Mediator
+    name: str
+
+    def __init__(self, mediator: Mediator, name: str) -> None:
+        self.mediator = mediator
+        self.name = name
+        self.mediator.register(self)
+
+    def send(self, event: str) -> None:
+        print(f"房东{self.name}发布信息: {event}")
+        self.mediator.notify(self, event)
+
+    def receive(self, event: str) -> None:
+        print(f"房东{self.name}收到通知: {event}")
+
+
+# 具体同事类：租客
+class Tenant(Colleague):
+    mediator: Mediator
+    name: str
+
+    def __init__(self, mediator: Mediator, name: str) -> None:
+        self.mediator = mediator
+        self.name = name
+        self.mediator.register(self)
+
+    def send(self, event: str) -> None:
+        print(f"租客{self.name}发布需求: {event}")
+        self.mediator.notify(self, event)
+
+    def receive(self, event: str) -> None:
+        print(f"租客{self.name}收到通知: {event}")
+
+
+# 具体中介者类
+class HousingMediator(Mediator):
+    colleagues: list[Colleague] = []
+
+    def register(self, colleague: Colleague) -> None:
+        if colleague not in self.colleagues:
+            self.colleagues.append(colleague)
+
+    def notify(self, sender: Colleague, event: str) -> None:
+        for colleague in self.colleagues:
+            if colleague != sender:
+                colleague.receive(event)
+
+
+if __name__ == "__main__":
+    print("============= 中介者模式 =============")
+
+    mediator = HousingMediator()
+
+    landlord1 = Landlord(mediator, "张三")
+    landlord2 = Landlord(mediator, "李四")
+    tenant1 = Tenant(mediator, "王五")
+    tenant2 = Tenant(mediator, "赵六")
+
+    landlord1.send("张三有一套两室一厅的房子出租，月租2000元。")
+    print("-----")
+    tenant1.send("王五需要一套三室的房子，预算3000元/月。")
+
+    print("\n=========== 中介者模式结束 ===========")