Introduction to Sharpino and Event Sourcing

Sharpino is a lightweight, modern F# event sourcing framework designed to power robust, predictable, and highly scalable backends.

The Paradigm Shift

Traditional CRUD applications rely on structural state stored in a relational database, constantly overwritten as the system changes. Event Sourcing represents a paradigm shift: moving from tracking the current structural state to tracking the behavioral domain events that caused the state to change.

In Sharpino, the immutable sequence of events is the single source of truth. The current state is simply a projection or "fold" of those events over time. This approach guarantees an absolute audit trail and enables powerful temporal queries.

The Canonical Example: BlazorBookLibrary

While Sharpino has numerous examples in its primary repository, the best way to understand its power in a real-world setting is by exploring the canonical, production-ready example: blazorBookLibrary.

This project demonstrates all the advanced features discussed throughout this book:

• Using Pure Aggregates with specific Value Object IDs.
• Eliminating bidirectional relationships in favor of unidirectional flow and Materialized Detail Views.
• High-performance, distributed L1/L2 caching using SQL and backplanes.
• A fully asynchronous architecture capable of robust web-scale workloads.
• Seamless integration between an F# domain backend and a C# Blazor frontend.

This book will guide you through the principles of building event-sourced systems using Sharpino, leveraging the architectural blueprints provided by blazorBookLibrary.