EventFlow.Example

DDD+CQRS+Event-sourcing examples using EventFlow following CQRS-ES architecture. It is configured with RabbitMQ, MongoDB(Snapshot store), PostgreSQL(Read store), EventStore(GES). It's targeted to .Net Core 2.2 and include docker compose file.

Event Sourcing/CQRS Architecture

The most common CQRS/ES architecture would look like following diagram

The example consists of the following concepts, each shown below

• Aggregates
• Command bus and commands
• Synchronous subscriber
• Event store (GES)
• In-memory read model.
• Snapshots (MongoDb)
• Sagas
• Event publising (In-memory, RabbitMq)
• Metadata
• Command bus decorator, custom value object, custom execution result, ...

Configuration

var resolver = EventFlowOptions.New
    .UseAutofacContainerBuilder(new ContainerBuilder())
    .Configure(c => c.ThrowSubscriberExceptions = true)
    .AddEvents(typeof(ExampleEvent))
    .AddEvents(typeof(ResetEvent))
    .AddCommands(typeof(ExampleCommand))
    .AddCommands(typeof(ResetCommand))
    .AddCommandHandlers(typeof(ExampleCommandHandler))
    .AddCommandHandlers(typeof(ResetCommandHandler))
    .ConfigureEventStore()
    .ConfigureMongoDb(client, SNAPSHOT_CONTAINER_NAME)
    .AddSnapshots(typeof(ExampleSnaphost))
    .UseMongoDbSnapshotStore()
    .RegisterServices(sr => sr.Register(i => SnapshotEveryFewVersionsStrategy.Default))
    .RegisterServices(DecorateCommandBus)
    .PublishToRabbitMq(RabbitMqConfiguration.With(new Uri(@"amqp://test:test@localhost:5672"), true, 4, "eventflow"))
    .UseInMemoryReadStoreFor<Aggregates.ReadModels.ExampleReadModel>()
    .AddJobs(typeof(ExampleJob))
    .CreateResolver());

📦 Stack

• EventFlow
• EventStore
• RabbitMQ
• MongoDB
• PostgreSQL
• Docker

🤝 Contributing

1. Fork it ( https://github.com/OKTAYKIR/EventFlow.Example/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

✨ Contributors

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📝 License

Apache-2.0 © Oktay Kır