Aarhus .NET User Group

Event sourcing is an approach to data persistence that is safe and flexible at the same time. It safely stores data as a log over all changes ever made. Nothing is lost. At the same time, event sourcing gives us tremendous flexibility to changes the business rules that govern how the data is used. These are some of the reasons that event sourcing has become increasingly popular over the past years. But even though event sourcing has some great benefits it's not the only good way to store data. Some scenarios call for a simple document store, and some call for a traditional relation model. Enter Postgresql. Postgresql is a fast, rock solid, and ops-friendly database. Just the kind of thing to rely on for mission critical applications. Postgres is also an unusually versatile database that may have its roots in the relational world, but today is equally capable of storing non-relational data. The Marten ORM leverages Postgres' JSON capabilities to make Postgres look like both an event store and a document database, which means that we get three models in one from Postgres: Relational, document, and event sourcing. In this talk I will give an introduction to event sourcing in general and event sourcing using Marten in particular. I will expand on that introduction to show how event sourcing tends to introduce a need for "readmodels" and how Marten supports that through its document store capabilities. Along the way there might be an anecdote or two from using Marten and Postgres in the real world and under heavy load. About the speaker: Christian Horsdal is an independent consultant with 20 years of experience building many kinds of systems from large scale microservice systems to tiny embedded systems and lots of stuff in between. He is a .NET expert, author of the books "Microservices in .NET Core" and "Instant Nancy Web Development", trainer, and an occasional open source contributor. -- Btw. our kind host, Novicell, will serve some kind of food during the evening. 🤓

Overskriften nævner "demo- og open-mic aften" - og hvad betyder det så... Det betyder kort at vi kører et helt åbent format, hvor der vil være forskellige præsentationer, af forskellige seje personer. Der vil selvfølgelig være en projektor, din bærbare kan blive tilsluttet, og så er det dig som får lov at føre ordet de næste 10-15 minutter. Hvad du skal præsentere, spørger du? Det bestemmer du selv - det kan være et fedt værktøj du bruger, en Cloud Service, et framework som sparker r*v, noget kode du selv har skrevet, en fed metode, et projekt du har været med til at udvikle, en sjov video... Anything goes, bare du holder dig inden for max 10-15 minutter. Vi hjælper dig selvfølgelig med at styre tiden. Der er allerede et par præsentationer linet op, kom bl.a. og hør Mathias Lykkegaard Lorentzen (https://github.com/ffMathy) fortælle om nogle af sine projekter. Vi "gider ikke se" velpudsede præsentationer, nej, denne aften kan alt ske, og så vil resten være op til demoguderne. Undervejs vil vores vært, Brølstærk, gerne byde på en sandwich, sodavand og kaffe, så vi kan holde et højt energiniveau. :-) Vi håber at se mange ansigter, og ikke mindst mange præsentationer - husk at man ikke behøver at være "særlig forberedt" for at gå "op på scenen". Ligesom man selvfølgelig også kan deltage uden at lave en præsentation. Vi glæder os til at se dig! :)