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DDD

The project is based on the principles of Domain-Driven Design (DDD). We have defined the following abstractions to model the tactical patterns of DDD:

ID

open class ID<I> (open val id: I) : ValueObject {
    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (other !is ID<*>) return false
        return id == other.id
    }

    override fun hashCode(): Int {
        return this.id.hashCode()
    }

    override fun toString(): String {
        return id.toString()
    }
}

Class that represents the identity of an entity.

Entity

open class Entity<I : ID<*>>(open val id: I) {
    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (other !is Entity<*>) return false
        return id == other.id
    }

    override fun hashCode(): Int {
        return id.hashCode()
    }

    override fun toString(): String {
        return id.toString()
    }
}

Class to identify a DDD object as Entity.

Value Object

interface ValueObject

Marker interface to easily identify a domain object as value object.

Aggregate Root

open class AggregateRoot<I : ID<*>> (id: I) : Entity<I>(id)

Class to easily identify a domain object as aggregate root, that is a specialization of entity.

Repository

interface Repository<I : ID<*>, E : Entity<*>> {
    fun findById(id: I): E?
    fun save(entity: E)
    fun deleteById(id: I): E?
    fun findAll(): Array<E>
    fun update(entity: E)
}

Interface to easily identify a domain object as repository, with minimal methods.

Factory

interface Factory<E : Entity<*>>

Marker interface to easily identify a domain object as factory.

Event

interface DomainEvent

Marker interface to easily identify a domain object as domain event.

Service

interface Service

Marker interface to easily identify a domain object as service.

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