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November 25, 2025 00:29
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[md-export] constitution-code-2
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| from dataclasses import dataclass | |
| from datetime import datetime | |
| from abc import ABC, abstractmethod | |
| # Domain command + IDs used at the boundary of the application layer | |
| @dataclass | |
| class BookingId: | |
| value: str | |
| @dataclass | |
| class CreateBookingCommand: | |
| user_id: str | |
| departure: datetime | |
| origin: str | |
| destination: str | |
| # Application service interface | |
| class BookingApplicationService(ABC): | |
| @abstractmethod | |
| def create_booking(self, command: CreateBookingCommand) -> "Booking": | |
| pass | |
| @abstractmethod | |
| def get_booking(self, booking_id: BookingId) -> "Booking | None": | |
| pass | |
| class BookingApplicationServiceImpl(BookingApplicationService): | |
| def __init__( | |
| self, | |
| bookings: "BookingRepository", | |
| payments: "PaymentAdapter", | |
| ): | |
| self._bookings = bookings | |
| self._payments = payments | |
| def create_booking(self, command: CreateBookingCommand) -> "Booking": | |
| # Validation & business rules | |
| # (no HTTP, no SDK types) | |
| self._validate_command(command) | |
| provisional = Booking.provisional( | |
| user_id=command.user_id, | |
| departure=command.departure, | |
| origin=command.origin, | |
| destination=command.destination, | |
| ) | |
| # Orchestration via adapters/repositories | |
| payment_result = self._payments.charge( | |
| PaymentRequest.for_booking(provisional), | |
| ) | |
| confirmed = provisional.confirm(payment_result) | |
| self._bookings.save(confirmed) | |
| return confirmed | |
| def get_booking(self, booking_id: BookingId) -> "Booking | None": | |
| return self._bookings.find_by_id(booking_id) | |
| def _validate_command(self, command: CreateBookingCommand) -> None: | |
| # Pure validation; raise domain-level errors only | |
| pass | |
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