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。
+*/
+
+// 抽象中介者
+interface Mediator {
+  register(colleague: Colleague): void;
+  notify(sender: Colleague, event: string): void;
+}
+
+// 抽象同事
+interface Colleague {
+  send(event: string): void;
+  receive(event: string): void;
+}
+
+// 具体中介者
+class HousingMediator implements Mediator {
+  private colleagues: Colleague[];
+
+  constructor() {
+    this.colleagues = [];
+  }
+
+  register(colleague: Colleague): void {
+    if (!this.colleagues.includes(colleague)) {
+      this.colleagues.push(colleague);
+    }
+  }
+
+  notify(sender: Colleague, event: string): void {
+    for (const colleague of this.colleagues) {
+      if (colleague !== sender) {
+        colleague.receive(event);
+      }
+    }
+  }
+}
+
+// 具体同事 - 房东
+class Landlord implements Colleague {
+  private mediator: Mediator;
+  private name: string;
+
+  constructor(mediator: Mediator, name: string) {
+    this.mediator = mediator;
+    this.name = name;
+    this.mediator.register(this);
+  }
+
+  send(event: string): void {
+    console.log(`房东${this.name}发布信息: ${event}`);
+    this.mediator.notify(this, event);
+  }
+
+  receive(event: string): void {
+    console.log(`房东${this.name}收到通知: ${event}`);
+  }
+}
+
+// 具体同事 - 租客
+class Tenant implements Colleague {
+  private mediator: Mediator;
+  private name: string;
+
+  constructor(mediator: Mediator, name: string) {
+    this.mediator = mediator;
+    this.name = name;
+    this.mediator.register(this);
+  }
+
+  send(event: string): void {
+    console.log(`租客${this.name}发布需求: ${event}`);
+    this.mediator.notify(this, event);
+  }
+
+  receive(event: string): void {
+    console.log(`租客${this.name}收到通知: ${event}`);
+  }
+}
+
+(function () {
+  console.log("============= 中介者模式 =============");
+  const mediator = new HousingMediator();
+
+  const landlord1 = new Landlord(mediator, "张三");
+  const landlord2 = new Landlord(mediator, "李四");
+  const tenant1 = new Tenant(mediator, "王五");
+  const tenant2 = new Tenant(mediator, "赵六");
+
+  landlord1.send("张三有一套两室一厅的房子出租，月租2000元。");
+  console.log("-----");
+  tenant1.send("王五需要一套三室的房子，预算3000元/月。");
+
+  console.log("\n=========== 中介者模式结束 ===========");
+})();