CQRS

A lightweight, opinionated CQRS and event sourcing framework targeting serverless architectures.

Opinions

• Aggregate persistence is via event sourcing only.
• Metadata is implemented only as a HashMap<String,String>. Further, the MetadataSupplier that the user provides has no insight into the event or aggregate that it supplies metadata for. This may be changed.
• JSON serialization only.
• Generics are preferred over boxed traits.
• Persistence is implemented through a Postgres database.

Todos/research

• Event upcasters.
• Some additional framework around GenericViewRepository to simplify event replay.
• Explore options for increasing the usefulness of MetadataSupplier.
• Event serialization uses the event type as the root node of the JSON tree. This simplifies deserialization but is non-standard.
• Persistence implementation for DynamoDb.