July 2017
Intermediate to advanced
374 pages
8h
English
Content preview from Cloud Native Python
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Understanding Event Sourcing
By simple definition, Event Sourcing is an architectural pattern which determines the state of an application by a sequence of events.
The best way to understand Event Sourcing is by using an analogy. One of the best examples would be online shopping, which is an event processing system. Somebody places an order, which gets registered in an order queue for a vendor ordering system. Then, this status is notified to the customer at different stages of the order being delivered.
All these events, which occur one after the other, form a sequence of events called an event stream, which should look something like the following diagram:
So, Event Sourcing takes consideration of events which happened in the past, and ...