Implementing Domain-Driven Design

Common Usage Scenarios

Now it’s important to consider common usage scenarios. How often will one user request need to load all 144 objects into memory at once? Would that ever happen? It seems not, but the team needs to check. If not, what’s the likely high-end count of objects? Also, will there typically be multiclient usage that causes concurrency contention on backlog items? Let’s see.

The following scenarios are based on the use of Hibernate for persistence. Also, each Entity type has its own optimistic concurrency version attribute. This is workable because the changing status invariant is managed on the BacklogItem Root Entity. When the status is automatically altered (to done or back to committed), the Root’s version is bumped. Thus, changes ...