Chronik is a lightweight EventSourcing/CQRS micro framework for Elixir.

Chronik application is composed of four components:

• The Chronik.Store which is an persisted store for domain events. Two adapters are provided Chronik.Store.Adapters.Ecto and Chronik.Store.Adapters.ETS.
• The Chronik.PubSub which publishes the domain events generated by the Chronik.Aggregate. In Chronik there is only one topic on the PubSub, a stream-all. This provides a global order of the events. Chronik provides a Registry based adapter Chronik.PubSub.Adapters.Registry.
• The Chronik.Aggregate modules which provides the abstraction of an aggregate. Aggregates receive and validate commands, based on its current state. If the command is accepted a number of domain events are generated and stored and published. Finally the aggregate transition to another states.
• The Chronik.Projection implements a read model on the Chronik.PubSub. The domain events are processed in order. Missing events are fetch from the Chronik.Store.