typescript: Mediator pattern

 

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/**  *  * Mediator pattern 中介者是一种行为设计模式， 让程序组件通过特殊的中介者对象进行间接沟通， 达到减少组件之间依赖关系的目的。  * file: Mediatorts.ts  * The Mediator interface declares a method used by components to notify the  * mediator about various events. The Mediator may react to these events and  * pass the execution to other components.  */ interface Mediator {         notify(sender: object, event: string): void; //void }   /**  * Concrete Mediators implement cooperative behavior by coordinating several  * components.  */ class ConcreteMediator implements Mediator {       private component1: Component1;       private component2: Component2;               constructor(c1: Component1, c2: Component2) {           this.component1 = c1;         this.component1.setMediator(this);         this.component2 = c2;         this.component2.setMediator(this);     }       public notify(sender: object, event: string):string  { //void         let getstr="";         if (event === 'A') {             console.log('Mediator reacts on A and triggers following operations:');             this.component2.doC();             getstr="Mediator reacts on A and triggers following operations:";             getstr=getstr+this.component2.doC();         }           if (event === 'D') {             console.log('Mediator reacts on D and triggers following operations:');             this.component1.doB();             this.component2.doC();             getstr="Mediator reacts on D and triggers following operations:";             getstr=getstr+this.component1.doB()+","+this.component2.doC();         }           return getstr;       } }   /**  * The Base Component provides the basic functionality of storing a mediator's  * instance inside component objects.  */ class BaseComponent {       protected mediator: Mediator;       constructor(mediator?: Mediator) {         this.mediator = mediator!;     }       public setMediator(mediator: Mediator): void {         this.mediator = mediator;     } }   /**  * Concrete Components implement various functionality. They don't depend on  * other components. They also don't depend on any concrete mediator classes.  */ class Component1 extends BaseComponent {       /**      *      * @returns      */     public doA(): string { //void         console.log('Component 1 does A.');         this.mediator.notify(this, 'A');           return "Component 1 does A."     }     /**      *      * @returns      */     public doB(): string { //void         console.log('Component 1 does B.');         this.mediator.notify(this, 'B');           return "Component 1 does B.";     } }   /**  *  */ class Component2 extends BaseComponent {       /**      *      * @returns      */     public doC(): string {         console.log('Component 2 does C.');         this.mediator.notify(this, 'C');         return "Component 2 does C.";     }     /**      *      * @returns      */     public doD(): string {         console.log('Component 2 does D.');         this.mediator.notify(this, 'D');         return "Component 2 does D.";     } }   let pubMediator1=""; let pubMediator2=""; let pubMediator3="Geovin Du"; let pubMediator4="geovindu";   /**  * The client code.  */ const c1 = new Component1();   const c2 = new Component2();   const mediator = new ConcreteMediator(c1, c2);   console.log('Client triggers operation A.'); pubMediator1=c1.doA();   console.log(''); console.log('Client triggers operation D.'); pubMediator2=c2.doD();   pubMediator3=mediator.notify(c1,"A");//B   pubMediator4=mediator.notify(c2,"D");//C     let messageMediator: string = 'Hello World,This is a typescript!,涂聚文 Geovin Du.Web'; document.body.innerHTML = messageMediator+",<br/>one="+pubMediator1+",<br/>two="+pubMediator2+",<br/>three="+pubMediator3+",<br/>four="+pubMediator4+",<br/>TypeScript Command Pattern 命令模式";

　　

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<!doctype html> <html lang="en"> <head>   <meta charset="UTF-8">   <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">   <meta http-equiv="X-UA-Compatible" content="ie=edge">     <head><title>TypeScript Hello Mediator pattern 中介者模式</title>       <meta name="Description" content="geovindu,涂聚文,Geovin Du"/> <meta name="Keywords" content="geovindu,涂聚文,Geovin Du"/> <meta name="author" content="geovindu,涂聚文,Geovin Du"/>     </head>     <body>         <script src="dist/Mediatorts.js"></script>     </body> </html>

　　

 

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