Maestro.Aggregate.ProjectionHandler behaviour (Maestro v1.0.0)

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ProjectionHandlers are used to manage alternate representations of an aggregate.

This defines a minimal behaviour for use within the aggregate command/event lifecycle. For projections that should be updated immediately iff the relevant events are committed, the relevant ProjectionHandler should by included in the list of :projections on the aggregate root.

Summary

Types

event()
repo()

Callbacks

project(repo, event)

Projections registered with an aggregate root are invoked for every event, so they should ignore unrelated events explicitly.

Types

event()

@type event() :: Maestro.Types.Event.t()

repo()

@type repo() :: module() | nil

Callbacks

project(repo, event)

@callback project(repo(), event()) :: value :: any()

Projections registered with an aggregate root are invoked for every event, so they should ignore unrelated events explicitly.