Let's Give DDD Back to Developers
summary
A legacy 140-line reservation method is incrementally refactored into domain objects and adapters: BigDecimal pricing is turned into an Amount value object and ratios into a Rate, XML printing is moved to a ReservationTicketPrinter in an exposition layer, and repository adapters plus an AllocationQuotaSpecification enforce VIP quotas. Refactor steps use IntelliJ extract/move/type-migration tools and an ApprovalTests Golden Master to keep tests stable while changing behavior; a pending-vs-assigned bug is fixed and an allocator aggregate with a contiguous-seat algorithm is developed and verified by tests.
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