[General Question] revisionGuard usage?

[AlexandreRoba]

Hi there, first thanks for all this open sourced cqrs component. They are of great value. I was wondering if you could point me to some documentation that describes what is the revisionGuard used for? I'm familiar with CQRS and I have followed Greg young intensive CQRS weekend seminar but I do not record having heard of the revision guard :( thanks for any help.
Alex.

[adrai]

HI Alexandre!

The revisionGuard is an optional part. (my invention)

If you need your events to be handled in order and your system(messaging layer) does not guarantee it and you have a revision number on your events (incremental number for the event stream) the revisionGuard ensures the ordered handling of the events.

for example if the received events are:

1. evt0
2. evt2
3. evt1

the revisionGuard will handle it that way:

1. evt0
2. evt1
3. evt2

and if there is a some missing events (i.e. if evt1 is never received) after a configurable timeout and EventMissing will be fired => https://github.com/adrai/node-cqrs-eventdenormalizer#wire-up-event-missing-optional

[AlexandreRoba]

Hi adrai, great, thanks for the clarification.