Get the latest tech news
Heard of Idempotency but unsure what it is?
lity of an operation to be performed multiple times whilst still yielding the same outcome. It is a critical property of handlers in an event driven system, since events can be reprocessed due to retries, network issues, or other failures.
Without idempotency, reprocessing the same event could lead to inconsistent states, duplicate entries, or other unintended side effects. This problem can be solved by using AsyncMonolith to emit an OrderCancelled event transactionally along with the changes to your domain, which subsequently invokes a handler that sends an email. By ensuring that your handlers are idempotent, you can safely reprocess events whilst making sure your system remains consistent and reliable.
Or read this on Hacker News