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| 1 | +/* eslint-disable max-classes-per-file */ |
| 2 | +/* eslint-disable no-console */ |
| 3 | +/* eslint-disable no-constructor-return */ |
| 4 | + |
| 5 | +class Singleton { |
| 6 | + private static instance: Singleton; |
| 7 | + private value: number; |
| 8 | + |
| 9 | + private constructor() { |
| 10 | + // Inicializa los atributos del Singleton aquí |
| 11 | + this.value = Math.ceil(Math.random() * 1000); |
| 12 | + } |
| 13 | + |
| 14 | + static getInstance(): Singleton { |
| 15 | + if (!Singleton.instance) { |
| 16 | + Singleton.instance = new Singleton(); |
| 17 | + } |
| 18 | + return Singleton.instance; |
| 19 | + } |
| 20 | + |
| 21 | + getValue(): number { |
| 22 | + return this.value; |
| 23 | + } |
| 24 | +} |
| 25 | + |
| 26 | +// Prueba del Singleton |
| 27 | +const singleton1 = Singleton.getInstance(); |
| 28 | +const singleton2 = Singleton.getInstance(); |
| 29 | + |
| 30 | +console.log(singleton1.getValue()); // Imprime el valor del primer Singleton |
| 31 | +console.log(singleton2.getValue()); // Imprime el mismo valor, ya que singleton1 y singleton2 son la misma instancia |
| 32 | +console.log(singleton1 === singleton2); // true, ambas variables referencian a la misma instancia |
| 33 | + |
| 34 | +interface User { |
| 35 | + id: number; |
| 36 | + username: string; |
| 37 | + name: string; |
| 38 | + email: string; |
| 39 | +} |
| 40 | + |
| 41 | +class UserSession { |
| 42 | + private static instance: UserSession; |
| 43 | + private user: User | null = null; // Usuario no asignado inicialmente |
| 44 | + |
| 45 | + private constructor() {} |
| 46 | + |
| 47 | + static getInstance(): UserSession { |
| 48 | + if (!UserSession.instance) { |
| 49 | + UserSession.instance = new UserSession(); |
| 50 | + } |
| 51 | + return UserSession.instance; |
| 52 | + } |
| 53 | + |
| 54 | + // Asigna un usuario a la sesión |
| 55 | + setUser(id: number, username: string, name: string, email: string): void { |
| 56 | + this.user = { |
| 57 | + id, |
| 58 | + username, |
| 59 | + name, |
| 60 | + email, |
| 61 | + }; |
| 62 | + } |
| 63 | + |
| 64 | + // Recupera los datos del usuario |
| 65 | + getUser(): User | null { |
| 66 | + return this.user; |
| 67 | + } |
| 68 | + |
| 69 | + // Borra los datos de la sesión |
| 70 | + clearUser(): void { |
| 71 | + this.user = null; |
| 72 | + } |
| 73 | +} |
| 74 | + |
| 75 | +// Prueba del Singleton en la gestión de sesiones |
| 76 | +const session1 = UserSession.getInstance(); |
| 77 | +session1.setUser(1, "marcode24", "Marco Cruz", "emailTest@gmail.com"); |
| 78 | + |
| 79 | +console.log(session1.getUser()); // Imprime el usuario asignado |
| 80 | + |
| 81 | +const session2 = UserSession.getInstance(); |
| 82 | +console.log(session2.getUser()); // También imprime el usuario asignado, ya que session1 y session2 son la misma instancia |
| 83 | + |
| 84 | +session2.clearUser(); |
| 85 | +console.log(session1.getUser()); // null, ya que el usuario ha sido borrado en la misma instancia |
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