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atomic-store - Atomic event store for Scala/Akka

Atomic Store is a system for managing persistent streams of atomic events, with strict consistency. It is intended for systems in which only one event can be admitted to a canonical event log at a time, contingent upon past events. It exists to maintain the atomicity of handling of incoming events, but outsources the actual validation logic back to the event originator. In a sense, the idea here is to do as little as possible to meet this goal, but in a way that is as practical as possible.Atomic Store is built on top of Akka Persistence, which is designed to natively support highly scalable distributed systems with relaxed consistency. A distributed system can maximize its scalability by reducing coupling between its components, and synchronization of state changes is one such coupling. The general approach to relaxed consistency is to take compensatory actions to rectify inconsistencies between distributed components, in retrospect. But this is complex, and not desirable in all situations. Atomic Store is designed for situations where strict consistency is more desirable or appropriate than extreme scalability.

EventStore.Akka.Persistence - Event Store Journal for Akka Persistence

Akka Persistence journal and snapshot-store backed by Event Store.Akka serializes your messages into binary data by default. However you can add your own serializer to serialize as JSON, But make sure you extend akka.persistence.eventstore.EventStoreSerializer rather then akka.serialization.Serializer. And in case you are really going to serialize as json, please specify ContentType.Json, it will allow you to use projections.

akka-stream-eventsourcing - Event sourcing for Akka Streams

Methods emit and respond themselves are side-effect free. They only generate Emission values that are interpreted by the EventSourcing stage.