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""" | ||
* EJERCICIO: | ||
* Explora el patrón de diseño "singleton" y muestra cómo crearlo | ||
* con un ejemplo genérico. | ||
* | ||
* DIFICULTAD EXTRA (opcional): | ||
* Utiliza el patrón de diseño "singleton" para representar una clase que | ||
* haga referencia a la sesión de usuario de una aplicación ficticia. | ||
* La sesión debe permitir asignar un usuario (id, username, nombre y email), | ||
* recuperar los datos del usuario y borrar los datos de la sesión. | ||
""" | ||
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class Singleton: | ||
_instance = None | ||
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def __new__(cls): | ||
"""Constructor of the Singleton.""" | ||
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if not cls._instance: | ||
cls._instance = super(Singleton, cls).__new__(cls) | ||
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return cls._instance | ||
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singleton_1 = Singleton() | ||
print(singleton_1) | ||
singleton_2 = Singleton() | ||
print(singleton_2) | ||
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print(singleton_1 is singleton_2) # True | ||
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""" | ||
* DIFICULTAD EXTRA (opcional): | ||
* Utiliza el patrón de diseño "singleton" para representar una clase que | ||
* haga referencia a la sesión de usuario de una aplicación ficticia. | ||
* La sesión debe permitir asignar un usuario (id, username, nombre y email), | ||
* recuperar los datos del usuario y borrar los datos de la sesión. | ||
""" | ||
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class UserSession: | ||
_instance = None | ||
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id: str = None | ||
username: str = None | ||
name: str = None | ||
email: str = None | ||
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def __new__(cls): | ||
if not cls._instance: | ||
cls._instance = super(UserSession, cls).__new__(cls) | ||
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return cls._instance | ||
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def set_user(self, id, username, name, email): | ||
self.id = id | ||
self.username = username | ||
self.name = name | ||
self.email = email | ||
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def get_user(self): | ||
return f"{self.id}, {self.username}, {self.name}, {self.email}" | ||
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def remove_data(self): | ||
self.id = None | ||
self.username = None | ||
self.name = None | ||
self.email = None | ||
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session_1 = UserSession() | ||
print(session_1.get_user()) | ||
# None, None, None, None | ||
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session_1.set_user(1, "nlarrea", "Naia", "[email protected]") | ||
print(session_1.get_user()) | ||
# 1, nlarrea, Naia, [email protected] | ||
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session_2 = UserSession() | ||
print(session_2.get_user()) | ||
# 1, nlarrea, Naia, [email protected] | ||
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session_3 = UserSession() | ||
session_3.remove_data() | ||
print(session_3.get_user()) | ||
# None, None, None, None | ||
print(session_1.get_user()) | ||
# None, None, None, None |