Starts what the framework needs at runtime, in the right order: the event bus, the handler subscriptions, the outbox poller and the dead-letter handler. Put it in your supervision tree after your repo:

children = [
  MyApp.Repo,
  {DDD.Supervisor, handlers: [MyApp.Handlers.SendWelcome, MyApp.Projections.ListSummary]}
]

The repo is config :vicander, repo: MyApp.Repo (see DDD.Config).

Options

• :handlers - the event handlers and projections (modules that use DDD.EventHandler or DDD.Projection) to subscribe. They are subscribed before the poller starts, because an event with no subscribed handler counts as delivered. Default: none.
• :poller - options for DDD.Outbox.Poller (:interval_ms, :batch_size, ...), or false for no poller and no dead-letter handler: what a test or a web-only node wants. Default: [], which polls every 500 ms in batches of 100.
• :retention - [older_than_days: 30] (and optionally :every_ms) to prune published events from the outbox on a timer (DDD.Outbox.Retention). Default: never prune.
• :repo - another repo than the configured one
• :name - the supervisor's name (default DDD.Supervisor)

If the event bus restarts, it forgets its subscriptions, so the supervisor restarts everything after it (the subscriptions and the poller) too.