how to deal with side effects?

[stephanos]

Is there a best practice on how to deal with side effects (e.g. email sending, external API calls)? If implemented in events, a replay of events would re-trigger them, which is usually not what you want.

[adrai]

It really depends on your architecture but: you can use eventExtenders (will not be called during replay) or with viewBuilders by marking the used collection with "noReplay"

[stephanos]

Thanks for the suggestions! I don't have an architecture yet :)
May I ask, how do you do it in your project(s)?

[adrai]

Stuff like email sending, with viewBuilders and eventExtenders...
And more important stuff with sagas... (cqrs-saga)

[stephanos]

Thanks.