Domain-Driven Design Q&A: Event Handling, Service Design, and Domain Boundaries

This article presents a Q&A session on Domain-Driven Design (DDD) from the "You Ask, I Answer" series by Meituan-Dianping's technology team. The content covers various DDD topics including event handling with database transactions, service interface design, domain boundaries, and the relationship between DDD and microservices. Multiple engineers provide different perspectives on each question, offering practical insights and implementation strategies.

Key topics include: using domain events with database transactions, designing RPC interfaces with proper parameter classes, distinguishing between domain and application layers, handling cross-aggregate operations, and identifying domain boundaries through bounded contexts. The article emphasizes that DDD is a methodology for understanding business essence and provides diverse approaches to solving common architectural challenges.