Demesne extends Akka's Persistence frameworks to provide structure to consistently build and use CQRS+ES based
AggregateRoots.
Overview
Demesne extends Akka's Persistence frameworks to provide structure to consistently build and use CQRS+ES based
AggregateRoots. Demesne is intended to be used in an Akka system along side other Actors, and handle the component
model and persistence for aggregates. Demesne AggregateRoots are Akka PersistentActor, and are accessed via Demesne's
demesne.DomainModel class. Commands are submitted to demesne.AggregateRoot, which if accepted and processed,
may produce zero or many Events that are published and persisted.
A demesne.DomainModel represents the collection of aggregates defined in a Bounded Context. Each DomainModel
exists within a single Akka ActorSystem.
Using Demesne
Aggregates are retrieved through one of demesne.DomainModel's aggregateOf operations.
Building AggregateRoots
Message Envelopes
Messages (Commands and Events) are wrapped with an envelope containing meta data that describes the unit of work,
actors involved and ordering.
Aggregates are returned from the DomainModel as an ActorRef. In order to ensure messages are sent into the domain with
an initial envelope use the enveloping send or !! operations. Developers need to ensure they continue using the
envelope capability at each point otherwise the meta envelope will not follow the unit of work.
Overview
Demesne extends Akka's Persistence frameworks to provide structure to consistently build and use CQRS+ES based AggregateRoots. Demesne is intended to be used in an Akka system along side other Actors, and handle the component model and persistence for aggregates. Demesne AggregateRoots are Akka PersistentActor, and are accessed via Demesne's demesne.DomainModel class. Commands are submitted to demesne.AggregateRoot, which if accepted and processed, may produce zero or many Events that are published and persisted.
A demesne.DomainModel represents the collection of aggregates defined in a Bounded Context. Each DomainModel exists within a single Akka ActorSystem.
Using Demesne
Aggregates are retrieved through one of demesne.DomainModel's
aggregateOfoperations.Building AggregateRoots
Message Envelopes
Messages (Commands and Events) are wrapped with an envelope containing meta data that describes the unit of work, actors involved and ordering.
Aggregates are returned from the DomainModel as an ActorRef. In order to ensure messages are sent into the domain with an initial envelope use the enveloping send or !! operations. Developers need to ensure they continue using the envelope capability at each point otherwise the meta envelope will not follow the unit of work.