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Event Sourcing

Event Sourcing: Projections with Liquid Projections

Projections are an important yet pretty simple concept when working with event-centric or event sourcing systems. The concept is to build a state from a stream of events. In my previous post, Event Sourcing with SQL Stream Store, I made a pretty basic projection to keep the current account balance. In this post, I’ll use Liquid Projections to accomplish the same task. I recommend checking out my post on SQL Stream Store as I’m using the same example/demo application in this post. Liquid Projections Liquid Projection is a library for building projections. The concept and API are pretty simple, and… Read More »Event Sourcing: Projections with Liquid Projections

Event Sourcing with SQL Stream Store

I’ve known about SQL Stream Store for a bit (I believe when it was called Cedar) but haven’t really looked into it much. The premise is to provide a stream store over SQL. Currently supporting MS SQL Server, PostgreSQL, and MySQL. Meaning it is simply a .NET Library you can use with an SQL implementation. Let’s take a look at how you can implement Event Sourcing with SQL Stream Store. SQL Stream Store Demo Application For this demo/sample, I’m going to create a .NET Core 3 console app. The idea will be to create the stereotypical event-sourcing example of a… Read More »Event Sourcing with SQL Stream Store

EventStore for Orleans Grain Persistence

In my previous post, I used the JournaledGrain to create an Event Sourced grain.  This enabled us to raise events from within our grain which would be applied to our grain state.  Next up, which I’m covering in this post is how to use EventStore for Orleans Grain Persistence. This means when we raise events, they will also be persisted to EventStore.  When our grain is activated, we can re-hydrate it by retrieving prior events from an EventStore stream and re-running them in our Grain to get back to current state. Blog Post Series: Part 1 – Practical Orleans Part… Read More »EventStore for Orleans Grain Persistence