Introduction

What is Eventuous?

Eventuous is a (relatively) lightweight library, which allows building production-grade applications using the Event Sourcing pattern.

The base library has a set of abstractions, following Domain-Driven Design tactical patterns, like Aggregate.

Additional components include:

• Aggregate persistence using EventStoreDB, PostgreSQL, and Microsoft SQL Server
• Real-time subscriptions for EventStoreDB, PostgreSQL, Microsoft SQL Server, RabbitMQ, and Google PubSub
• Command services and HTTP-based commands
• Extensive observability, including Open Telemetry support
• Integration with ASP.NET Core dependency injection, logging, and Web API
• Producers for EventStoreDB, RabbitMQ, Google PubSub, and Apache Kafka
• Read model projections for MongoDB
• Gateway for producing events to other services (Event-Driven Architecture support)

note

Eventuous is under active development and doesn't follow semantic versioning. We introduce changes often, according to immediate needs of its production users. The API hasn't reached a stable state and can change at any time. A patch version update would normally not change the API, but the minor version cloud.

Packages

You can find all the NuGet packages by visiting the Eventuous profile.

Package	What's it for
Eventuous	The umbrella package that includes the most used components
Eventuous.Domain	Library that includes the domain model abstractions like aggregates
Eventuous.Persistence	The base library for persistence, including event store and aggregate store abstractions
Eventuous.Application	Command services base library, including diagnostics and DI support
Eventuous.Subscriptions	Subscriptions base library, including diagnostics and DI support
Eventuous.Subscriptions.Polly	Support for retries in event handlers using Polly
Eventuous.Producers	Producers base library, including diagnostics and DI support
Eventuous.Diagnostics	Diagnostics base library
Eventuous.Diagnostics.OpenTelemetry	Diagnostics integration with OpenTelemetry
Eventuous.Diagnostics.Logging	Eventuous internal logs adapter for ASP.NET Core logging
Eventuous.Gateway	Eventuous gateway for connecting subscriptions with producers
Eventuous.EventStore	Support for EventStoreDB (event store, subscriptions, producers)
Eventuous.Postgresql	Support for PostgreSQL (event store, subscriptions, producers)
Eventuous.SqlServer	Support for Microsoft SQL Server (event store, subscriptions, producers)
Eventuous.RabbitMq	Support for RabbitMQ (subscriptions, producers)
Eventuous.GooglePubSub	Support for Google PubSub (subscriptions, producers)
Eventuous.Kafka	Support for Apache Kafka (producers)
Eventuous.ElasticSearch	Support for Elasticsearch (producers, event store for archive purposes)
Eventuous.Projections.MongoDB	Projections support for MongoDB
Eventuous.AspNetCore	DI extensions for app services, aggregate factory, etc.
Eventuous.AspNetCore.Web	HTTP API automation for app services

Normally, for the domain model project, you would only need to reference Eventuous.Domain package.

Go further - WIP

Read about the right way to understand how Eventuous embraces the original idea of Event Sourcing.

You can have a look at the sample project in a separate repository.