oktaykir / eventflow.example Goto Github PK

View Code? Open in Web Editor NEW

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.

License: Apache License 2.0

C# 100.00%

eventflow.example's Introduction

EventFlow.Example

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());