Mastering Microservices with Java - Third Edition

Factory

A factory is required when a simple constructor is not enough to create the object. It helps to create complex objects, or an aggregate that involves the creation of other related objects.

A factory is also a part of the life cycle of domain objects, as it is responsible for creating them. Factories and repositories are in some way related to each other, as both refer to domain objects. The factory refers to newly created objects, whereas the repository returns the pre-existing objects either from the memory, or from external storage.

Let's see how control flows, by using a user creation process application. Let's say that a user signs up with a username, user1. This user creation first interacts with the factory, which creates the ...