Symbio (Reactive Storage)
The VLINGO XOOM Reactive CQRS and Event Sourcing storage and projections.
The idea behind the name "symbio" is that there is a symbiotic relationship between domain models and persistence, and persistence and domain models. They depend on each other, but in a way that neither "life form" may be entirely conscious of the other. This is certainly true of the domain model more so than the data model.
The XOOM Symbio parent tool is a set of protocols and default in-memory implementations. The protocols are usable by concrete implementations. The in-memory implementations are useful for testing.
There are three primary kinds of storage mechanism protocols available:
StateStore(i.e. Key-Value and NoSQL), and
Journal. Among these there are a number of concrete implementations. For example, there are Postgres implementations of all three:
An important point to consider is, if you use the XOOM Lattice entity types, there is no need to learn the operations of the storage types. You get all storage persistence for free when you use one of
Each storage type is discussed in the following subsections. Additionally there is a separate useful discussion about Adapters, which are used to translate between application or service state and persistent state.
An object storage in which
The basic state storage protocol in which
Used within a Bounded Context (microservice) to store
Used to roundtrip translate between service/application state and storage state.