#eventsourcing

10 posts · Last used Sep 07

CQRS, async with retries and dead-lettering, event sourcing, projections, workflows. That feature list usually means a platform team. I built it as an e-commerce shop on Tempest + Ecotone. The entire messaging layer: about a dozen small classes of business logic. No worker command, no repository, no queue wiring. The Order aggregate IS the Tempest database model. One class, both frameworks. https://github.com/ecotoneframework/tempest-ecotone-demo #PHP #CQRS #EventSourcing
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Requirements change, but your events are immutable and your history lives forever. So how do you evolve them without breaking anything? I just published the second and final part of my two-part series on event design: "Evolving Your Events Over Time." It walks through the whole toolbox of event evolution, from a free rename to rebuilding the whole store. Feel free to check it out! https://patchlevel.dev/blog/evolving-your-events-over-time #TechBlog #PHP #DDD #EventSourcing #EventDesign
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Replying to
There is a comparison that can be made between ActivityPub and Event-Sourcing. 2/ With Event-Sourcing, you can "project" the events to get another (often more peformant) view of the data in the events. Without having to incur the cost of having to read all the events to figure out the final state. ... #ActivityPub #ActivityStreams #EventSourcing #FediDev
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Replying to
There is a comparison that can be made between ActivityPub and Event-Sourcing. 3/ With ActivityPub, Activities are often applied to an object. That object gets assigned an ID in the form of a URL. (And, by URL I mean URL, URI, IRI, etc.) One doesn't have to read through all the Activities in an inbox, outbox, etc to get the final state of an object. One can just get the JSON-LD document from the object's ID URL to get the final state. #ActivityPub #ActivityStreams #EventSourcing #FediDev
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