akka.projection.cassandra.scaladsl

Factories of akka.projection.Projection where the offset is stored in Cassandra. The envelope handler can integrate with anything, such as publishing to a message broker, or updating a read model in Cassandra.

The envelope handler function can be stateful, with variables and mutable data structures. It is invoked by the Projection machinery one envelope at a time and visibility guarantees between the invocations are handled automatically, i.e. no volatile or other concurrency primitives are needed for managing the state.