Nebula is an open-source .NET Core data abstraction library backed by Cosmos DB. It was architected to streamline the storage of domain entities in a way that promotes solid domain driven design, provides versioned append-only operations and integrates seamlessly into microservice archiectures.
Nebula leverages the speed and scailability of Cosmos DB while significantly reducing it's cost limitations by logically separating data across shared throughput allocation. This unlocks the benefits of Cosmos DB to projects with lower budgets and simplifies Cosmos DB service operational complexity where price is not a factor.
public void ConfigureServices(IServiceCollection services)
{
services.AddNebula("FloristService", Configuration);
services.AddScoped<FlowerStore>();
}public void Configure(IApplicationBuilder app)
{
app.UseNebula();
}{
"Nebula": {
"ServiceEndpoint": "https://localhost:8081",
"AuthKey": "C2y6yDjf5/R+ob0N8A7Cgv30VRDJIWEHLM+4QDU5DE2nQ9nDuVTqobD4b8mGGyPMbIZnqyMsEcaGQy67XIw/Jw=="
}
}public class FlowerStore : VersionedDocumentStore
{
private readonly DocumentTypeMapping<Daisy> _mapping;
private readonly DocumentStoreConfig _config;
private readonly IVersionedDocumentStoreClient _client;
public FlowerStore(IDocumentDbAccessProvider dbAccessProvider) : base(dbAccessProvider, false)
{
var config = new DocumentStoreConfigBuilder("Flowers");
var documentType = config.AddDocument("Daisy").Finish();
_mapping = config.AddDocumentMapping<Daisy>(documentType.DocumentName)
.SetIdMapper(x => x.Id.ToString())
.SetPartitionMapper(x => x.Id.ToString())
.Finish();
_config = config.Finish();
_client = CreateStoreLogic(DbAccess, _config);
DbAccess.ConfigRegistry.RegisterStoreConfigSource(this);
}
protected override DocumentStoreConfig StoreConfig
{
get { return _config; }
}
protected override IVersionedDocumentStoreClient StoreClient
{
get { return _client; }
}
public async Task<Daisy> GetById(Guid id)
{
var result = await StoreClient.GetDocumentAsync(id.ToString(), _mapping, null);
return result.Document;
}
public async Task Upsert(Daisy daisy)
{
await StoreClient.UpsertDocumentAsync(daisy, _mapping, new OperationOptions());
}
}