the longevity context
In broad terms, you build your LongevityContext by specifying your domain model as a type
parameter, and optionally providing a configuration. Using Future as an effect, and without
specifying a configuration, it looks like this:
import longevity.context.LongevityContext
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future
val context = LongevityContext[Future, DomainModel]()
This call takes an implicit parameter of type longevity.model.ModelEv[DomainModel]. Because we
annotated our DomainModel trait as a longevity domain model, like so:
import longevity.model.annotations.domainModel
@domainModel trait DomainModel
The ModelEv[DomainModel] is found by the Scala compiler in the DomainModel companion object.
The longevity context contains a variety of tools for you to use relating to your model. The main thing it gives you is the repository - which supplies all the basic persistence operations you need to maintain your back-end store. But there are many other tools there, most of which are most useful when writing tests.