A lightweight EventSourcing/CQRS micro framework for Elixir.

Chronik is composed of four components:

• The Chronik.Store which is an persisted data store for domain events. Two adapters are provided:

  • Chronik.Store.Adapters.Ecto
  • Chronik.Store.Adapters.ETS

• The Chronik.PubSub which publishes the domain events generated by 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, stored and published. Finally, the aggregate transitions to the next desirable state.

• The Chronik.Projection implements a read model on the Chronik.PubSub. The domain events are processed in order. Missing events are fetch from Chronik.Store.

Debugging can be turned off by placing the following in a config script:

config :chronik, :debug, false