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Results tagged with event-sourcing
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user 6509
Architectural pattern that manages the current state as the result of a sequence of events that are captured and stored and each trigger a state change.
2
votes
Same Event types for multiple micro-services
The scenario you described is what the Open Tracing standard is designed to resolve. The Open Tracing standard has several libraries and agregators that help to integrate it with your application. B …
- 46.3k
1
vote
Should I create one large initial event or break down in smaller events?
I think the answer to your question comes from defining what the failure states for your application are. Event based systems come in a couple flavors: persistent queues and objects passed in memory. …
- 46.3k
6
votes
Accepted
Effective methodology in designing event driven systems
While I am not an advocate of Big Design Up Front, I'm also not an advocate of No Design Up Front. Some systems are complicated enough you have to think through them. When you have multiple systems …
- 46.3k
0
votes
Accepted
In an event sourced system, how do I get a current state of an entity?
According to all that I've looked into, you get your current state by doing a projection of your event history into the format you intend to use. A projection is, in functional terms, a left fold.
Th …
- 46.3k
3
votes
In CQRS/ES should database calls be done in command handlers or domain models?
They aren't really that incompatible. We have these two principles:
CQRS says that the business logic is enforced inside the command
DDD says that your domain model handles the business logic
So to …
- 46.3k
5
votes
Accepted
Should microservices in an event sourced architecture not communicate directly with one anot...
When working with microservices, the biggest concern is the time it takes to process requests. That means you have to manage synchronous response times. The important thing is to realize the impact …
- 46.3k
1
vote
What to improve/change and how to move forward with my Event Storming session?
Biggest constructive criticism I have is that you are still very much in a CRUD mindset rather than an Event Sourced mindset. In general restrict the language you use to describe the concepts:
Aggre …
- 46.3k