Qowaiv.DomainModel

Qowaiv Domain Model is a library containing the (abstract) building blocks to set up a Domain-Driven application.

Event Sourcing

Within Qowaiv Domain Model, the choice has been made to only support DDD via Event Sourcing. In short: Event Sourcing describes the state of an aggregate (root) by the (domain) events that occurred within the domain. Getting the current state of an aggregate can always be achieved by replaying these events.

Always Valid

The aggregate should always be valid according to the boundaries of its domain. There are multiple ways to achieve this, but within Qowaiv Domain Model this is guaranteed via an implicitly triggered validator.

When a public method is called that would lead to a new aggregate state, the events describing the change are only added to the event buffer associated with the aggregate if the new state is valid according to the rules specified in the validator.

Aggregate

An aggregate is a cluster of associated objects that we treat as a unit for the purpose of data changes. When implementing an aggregate there are several steps that have to be taken.

Further reading

More info can be found at https://github.com/Qowaiv/qowaiv-domainmodel.