This repository is practical EventSourcing implementation on Azure. It mostly aims to implement CQRS, EventSourcing basics towards Serverless way on Azure. ImGalaxy is used for the purpose of providing to use Azure Cosmos DB as stream based EventStore and whole concepts of DDD, CQRS, EventSourcing needs. Change Feed is being used for projecting events from EventStore.

• .Net Core 2.2
• Azure Cosmos DB Instance (You can use Emulator for testing purpose)

• ImGalaxy for base structure of Aggregate modelling and Stream based persistance of Azure Cosmos DB
• MediatR for seperating command and queries
• Microsoft.Azure.WebJobs.Extensions.CosmosDB for connecting Change Feed processor

Command and Query model are separated by applying CQRS (Command Query Responsibility Segregation) technic.

Command Side

• OrderContext.Application - Commands and CommandHandlers are within this layer. It basicly handles commands and call that related behavoir in the domain model.
• OrderContext.Command.API - REST API application. Very thin, hosting Asp.Net Core application.

Query Side

• OrderContext.Projections- Azure function which is connected to Azure Cosmos DB Change feed. It listens the change feed & project events for real model.
• OrderContext.Query.API- REST API application. Builds InMemory read model for OrderContext also includes query handler for client needs.

Shared

• OrderContext.Domain- Domain model around Order bounded context.
• OrderContext.Domain.Messages- Domain events that can be happen in the Order context.
• OrderContext.Integration.Events- Events which are getting published to EventBus to communicate with other bounded contexts.

Background Functions

They act as async processes which are connected to Azure CosmosDB Change Feed

• OrderContext.Integration.Publisher- Azure function which is connected to Azure Cosmos DB Change feed. It tends to publish essential integration events to EventBus.
• OrderContext.Snapshotter- Azure function which is connected to Azure Cosmos DB Change feed. It takes snapshots of domain model as the snapshot strategy is defined.

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The project is under MIT license.