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48 lines
1.3 KiB
48 lines
1.3 KiB
import { Subject } from "../observe/Observable";
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import { Model } from "./AbstractModel";
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import { Observer } from "../observe/Observer";
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export class UserModel implements Model, Subject {
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/**
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* @type {Observer[]} List of subscribers. In real life, the list of
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* subscribers can be stored more comprehensively (categorized by event
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* type, etc.).
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*/
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private observers: Observer[] = [];
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private state: number = 0;
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constructor() { }
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/**
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* The subscription management methods.
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*/
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public attach(observer: Observer): void {
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console.log('Subject: Attached an observer.');
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this.observers.push(observer);
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}
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public detach(observer: Observer): void {
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const observerIndex = this.observers.indexOf(observer);
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this.observers.splice(observerIndex, 1);
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console.log('Subject: Detached an observer.');
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}
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/**
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* Trigger an update in each subscriber.
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*/
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public notify(): void {
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console.log('Subject: Notifying observers...');
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for (const observer of this.observers) {
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observer.update(this.state);
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}
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}
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public someBusinessMethod(num: number): void {
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this.state = num;
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this.helperMethod();
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console.log(`Subject: My state has just changed to: ${this.state}`);
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this.notify();
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}
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private helperMethod() {}
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}
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