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facade.py
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facade.py
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from dataclasses import dataclass
class ComplexSystemStore:
def __init__(self, filepath: str):
self.filepath = filepath
self.cache = {}
print(f"Reading data from file: {filepath}")
def store(self, key: str, value: str):
self.cache[key] = value
def read(self, key: str):
return self.cache[key]
def commit(self):
print(f"Storing cached data to file {self.filepath}")
@dataclass
class User:
login: str
# Facade
class UserRepository:
def __init__(self):
self.system_preferences = ComplexSystemStore("/data/default.prefs")
def save(self, user: User):
self.system_preferences.store("USER_KEY", user.login)
self.system_preferences.commit()
def find_first(self):
return User(self.system_preferences.read("USER_KEY"))
if __name__ == '__main__':
user_repo = UserRepository()
user = User("john")
user_repo.save(user)
retrieved_user = user_repo.find_first()
print(retrieved_user.login)