StatusObserver

Invoked as soon as the projected information is readable by a separate thread (e.g committed to database). It will not be invoked if the envelope is skipped or handling fails.

Called as soon as an envelop is ready to be processed. The envelope processing may not start immediately if grouping or batching are enabled.

Called when processing of an envelope failed. The invocation of this method is not guaranteed when the handler failure causes a stream failure (e.g. using a Flow-based handler or a recovery strategy that immediately fails).

From the recoveryStrategy and keeping track how many times error is called it's possible to derive what next step will be; fail, skip, retry.

Called when a projection failed.

The projection will be restarted unless the projection restart backoff settings are configured with max-restarts limit.

Called when the corresponding offset has been stored. It might not be called for each envelope.

Called when a projection is started. Also called after the projection has been restarted.

Called when a projection is stopped. Also called before the projection is restarted.