add 中介模式

Author: ryangle

17.中介模式.ipynb

@@ -4,7 +4,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# 模式 Pattern\n"
+    "# 中介模式 Mediator Pattern\n",
+    "\n",
+    "将对象间的交互和通讯封装在一个类中，各个对象间的通讯不必显式的声明和引用。这样就大大降低了系统的复制性和耦合程度。"
    ]
   },
   {
@@ -21,7 +23,64 @@
    "outputs": [],
    "source": [
     "#nullable enable\n",
-    "\n"
+    "\n",
+    "public abstract class Colleage{\n",
+    "    public abstract void Action();\n",
+    "    public string? State {get;set;}\n",
+    "    public Mediator? Mediator {get;set;}\n",
+    "}\n",
+    "public class ConcreteColleageA:Colleage{\n",
+    "    public override void Action(){\n",
+    "        Mediator?.DoActionFromAtoB();\n",
+    "    }\n",
+    "}\n",
+    "public class ConcreteColleageB:Colleage{\n",
+    "    public override void Action(){\n",
+    "        Mediator?.DoActionFromBtoA();\n",
+    "    }\n",
+    "}\n",
+    "public abstract class Mediator{\n",
+    "    protected Colleage _colleageA;\n",
+    "    protected Colleage _colleageB;\n",
+    "    public Mediator(Colleage colleageA,Colleage colleagB){\n",
+    "        _colleageA = colleageA;\n",
+    "        _colleageB = colleagB;\n",
+    "    }\n",
+    "    public abstract void DoActionFromAtoB();\n",
+    "    public abstract void DoActionFromBtoA();\n",
+    "}\n",
+    "public class ConcreteMediator:Mediator{\n",
+    "    public ConcreteMediator(Colleage colleageA,Colleage colleagB):base(colleageA,colleagB){}\n",
+    "    public override void DoActionFromAtoB(){\n",
+    "        _colleageB.State = _colleageA.State;\n",
+    "    }\n",
+    "    public override void DoActionFromBtoA(){\n",
+    "        _colleageA.State = _colleageB.State;\n",
+    "    }\n",
+    "\n",
+    "}\n",
+    "\n",
+    "ConcreteColleageA colleageA = new();\n",
+    "ConcreteColleageB colleageB = new();\n",
+    "ConcreteMediator mediator = new(colleageA,colleageB);\n",
+    "colleageA.Mediator = mediator;\n",
+    "colleageB.Mediator = mediator;\n",
+    "\n",
+    "colleageA.State = \"A old state\";\n",
+    "colleageB.State = \"B old state\";\n",
+    "\n",
+    "colleageA.Action();\n",
+    "\n",
+    "colleageA.State.Display();\n",
+    "colleageB.State.Display();\n",
+    "\n",
+    "colleageA.State = \"A new state\";\n",
+    "colleageB.State = \"B new state\";\n",
+    "\n",
+    "colleageB.Action();\n",
+    "\n",
+    "colleageA.State.Display();\n",
+    "colleageB.State.Display();"
    ]
   }
  ],