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| from typing import Dict, List, Optional
from abc import ABC, abstractmethod
class UserService:
"""用户服务子系统"""
_users: Dict[str, Dict] = {
"user1": {"id": "user1", "name": "Alice", "email": "alice@example.com"},
"user2": {"id": "user2", "name": "Bob", "email": "bob@example.com"}
}
def get_user(self, user_id: str) -> Optional[Dict]:
return self._users.get(user_id)
def create_user(self, name: str, email: str) -> Dict:
user_id = "user" + str(len(self._users) + 1)
user = {"id": user_id, "name": name, "email": email}
self._users[user_id] = user
return user
def delete_user(self, user_id: str) -> bool:
if user_id in self._users:
del self._users[user_id]
return True
return False
class OrderService:
"""订单服务子系统"""
_orders: List[Dict] = []
def create_order(self, user_id: str, items: List[str]) -> Dict:
order_id = "ORD-" + str(len(self._orders) + 1)
order = {
"id": order_id,
"user_id": user_id,
"items": items,
"status": "pending"
}
self._orders.append(order)
return order
def get_order(self, order_id: str) -> Optional[Dict]:
for order in self._orders:
if order["id"] == order_id:
return order
return None
def cancel_order(self, order_id: str) -> bool:
order = self.get_order(order_id)
if order:
order["status"] = "cancelled"
return True
return False
class PaymentService:
"""支付服务子系统"""
def process_payment(self, order_id: str, amount: float) -> bool:
print(f"处理支付: 订单 {order_id}, 金额 {amount}")
return True
def refund(self, order_id: str, amount: float) -> bool:
print(f"退款: 订单 {order_id}, 金额 {amount}")
return True
class NotificationService:
"""通知服务子系统"""
def send_email(self, to: str, subject: str, body: str) -> None:
print(f"发送邮件到 {to}: {subject}")
def send_sms(self, to: str, message: str) -> None:
print(f"发送短信到 {to}: {message}")
class ECommerceFacade:
"""电商系统外观"""
def __init__(self):
self.user_service = UserService()
self.order_service = OrderService()
self.payment_service = PaymentService()
self.notification_service = NotificationService()
def create_account(self, name: str, email: str, phone: str) -> Dict:
"""创建账户的统一接口"""
user = self.user_service.create_user(name, email)
self.notification_service.send_email(
email,
"欢迎注册",
f"欢迎 {name}！您的账户已创建。"
)
self.notification_service.send_sms(
phone,
f"欢迎 {name}！您的账户已创建。"
)
return user
def place_order(self, user_id: str, items: List[str]) -> Optional[Dict]:
"""下单的统一接口"""
user = self.user_service.get_user(user_id)
if not user:
print("用户不存在")
return None
order = self.order_service.create_order(user_id, items)
amount = len(items) * 99.0
if not self.payment_service.process_payment(order["id"], amount):
self.order_service.cancel_order(order["id"])
return None
self.notification_service.send_email(
user["email"],
"订单确认",
f"您的订单 {order['id']} 已创建。"
)
return order
def cancel_order(self, order_id: str) -> bool:
"""取消订单的统一接口"""
if not self.order_service.cancel_order(order_id):
return False
self.payment_service.refund(order_id, 99.0)
return True
def main():
ecommerce = ECommerceFacade()
user = ecommerce.create_account("Charlie", "charlie@example.com", "13800138000")
print(f"用户创建成功: {user}\n")
order = ecommerce.place_order(user["id"], ["商品A", "商品B"])
print(f"订单创建成功: {order}\n")
ecommerce.cancel_order(order["id"])
if __name__ == "__main__":
main()
|