ProductContext-EventSourcing

A practical/experimental Event Sourcing application on Product Bounded Context in an e-commerce

Purpose

I wanted to implement what i learnt about DDD CQRS and EventSourcing, that's why i created this repository. I will add new things to here by time as i learn.

Dependencies

• Docker
• EventStore
• Couchbase for query side

EventStore and Docker will be organized by docker-compose.yml

Libraries

• AggregateSource for base structure of AggregateRoots and Entities
• Value for value objects
• MediatR for seperating command and queries
• Projac for projections
• LibLog for logging

How

Repository contains a docker-compose.yml file which provides all dependencies for bootstrapping and developing.

docker-compose up

You can run tests afterwards.

Domain Model

WebEventStorming is used for Event Storming while modeling domain model.

Domain model basically provides a Product which has a Color (Content) and it's Variants.

Project Structure

Solution has 3 main projects. These projects are:

• ProductContext.WebApi
• ProductContext.Domain
• ProductContext.Framework

ProductContext.WebApi

• Uses Swagger for documentation
• Has a ProductCommandsApi as controller
• Uses Mediator for sending commands to handler

ProductContext.Domain

• Events and Commands sit here.

AggregateRoot	Entities	ValueObjects	Documents
Product	ProductContent	ProductContentId	ProductContentDocument
	ProductVariant	ProductVariantId	ProductVariantDocument
		ProductId	ProductDocument
		ProductContentVariantValue
		ProductVariantTypeValue
VariantTypeValue		VariantTypeValueId	Not yet implemented

Product is a Snapshotable aggregate root.

ProductContext.Framework

• Snapshotting with AsyncSnapshotableRepository<TAggregateRoot>
• Tracking last projection status with CouchbaseCheckpointStore
• Now, GetStreamName, GetSnapshotStreamName delegates for creating proper stream Ids
• ProjectionManager runs the Projections and every event fall into Projac projection handler.

Deploy

• Kubernetes

  • minikube start
  • eval $(minikube docker-env) switch to kubernetes local registry your current terminal context
  • docker ps #see what's going on kubernetes local registry
  • docker build -t productcontextes .

• Helm

  • Switch to /deployments
  • helm package productcontext --debug
  • helm install productcontext

To Be Implemented

• Correlation/Causation Id

Notes

What brings you here of course not unique. I inspired a lot from WorkshopEventSourcing