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AtomEventStore is a .NET library that uses the Atom Syndication Format to provide a server-less implementation of an Event Store.
It was created to solve a particular set of problems:
- It should support Test-Driven Development (particularly Outside-In TDD, or GOOS-style TDD) without adding much overhead.
- It should work well with Platform-as-a-Service solutions such as Microsoft Azure.
- It should be scalable.
- It should be lock-free.
- It should be reusable.
- It should be reasonably efficient.
As always in software development, there are trade-offs involved, so while AtomEventStore is designed mainly with the above goals in mind, it's not optimized for low latency, efficient storage, or fastest possible transmission times. It's also not designed to handle concurrent writes; the applications using AtomEventStore are expected to address this problem through applications of the Single Writer pattern.
AtomEventStore is a library with a top-level API organised around the well-known .NET interfaces IEnumerable<T> and IObserver<T>.
- Events are written using
IObserver<T>.OnNext, although and asynchronous alternative is also available. - Events are read using
IEnumerable<T>.
Supporting types enable clients to customize
- The underlying storage mechanism.
- How events are serialized and deserialized.
How an event stream is interpreted and optimised is entirely up to the client.
The idea that an Event Store can be modelled as a Linked List was originally put to my attention by Yves Reynhout in his article Your EventStream is a linked list.