All Questions
Tagged with cqrsevent-programming
7 questions
2votes
1answer
931views
How to handle aggregations of out-of-order events in an event stream?
I'm interested in integrating with an external system which uses webhooks to notify clients of events. The system is very similar to Stripe - the REST endpoints have rate limits to avoid undue polling ...
-4votes
1answer
72views
What do you store first in a CQRS + ES architecture
I've recently started reading about CQRS, DDD and EventSourcing. From what I've read one of the best ways to do ES is to have an event store and then a regular DB or cache for easier querying. However,...
- 101
1vote
2answers
2kviews
Designing events in an event-driven (event sourced) architecture and managing duplication
I have been creating a POC for a part of our system but I'm finding some trouble communicating some of the ideas behind it. This takes ideas from Event Sourcing and Event Driven Architecture but ...
- 321
15votes
2answers
5kviews
How do I deal with side effects in Event Sourcing?
Let's assume that we want to implement a small security subsystem for a financial application that warns the users via email if a strange pattern is detected. For this example, the pattern will ...
- 321
0votes
1answer
921views
CQRS - Passing aggregate root as argument
So, I have following code: public class CQRSQuestion { public static void main(String[] args) { //received command for algorithm run AlgorithmAR algorithmAR = new AlgorithmAR(...
10votes
2answers
6kviews
How to create new aggregate root in CQRS?
How should we create new aggregate roots in cqrs architecture? In this example I want to create new aggregate root AR2 that holds reference to first one AR1. I'm creating AR2 using AR1 method as ...
18votes
1answer
5kviews
Should I use a command or an event?
The difference between a command and an event in bus communication seems a little vague to me. I know that commands should be executed once only, while an event can be handled multiple times, but ...
- 1,023
