Scala with DDD
32. trait Entity[ID <: Identity[_]] { ! /** エンティティの識別子。 */ val identity: ID ! override final def hashCode: Int = 31 * identity.## ! override final def equals(obj: Any): Boolean = obj match { case that: Entity[_] => identity == that.identity case _ => false } ! } 33. trait Identity[+A] extends Serializable { ! def value: A ! } ! object EmptyIdentity extends Identity[Nothing] { ! def value = throw E
Functional Programming + Domain-Driven Design
Functional programming promotes immutable classes and referential transparency. Domain-driven design is composed of Value Object (immutable) and Entities (mutable). Should we create immutable Entities instead of mutable ones? Let's assume, project uses Scala as main language, how could we write Entities as case classes (immutable so) without risking stale status if we're dealing with concurrency?
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