Storage | Messaging | Reflection

The Namotion.Storage .NET libraries provide abstractions and implementations for storage services like blob storages, file systems or object storages.

By programming against a storage abstraction you enable the following scenarios:

• Build multi-cloud capable applications by being able to change storage technologies on demand.
• Quickly switch to different storage technologies to find the best technological fit for your applications.
• Implement behavior driven integration tests which can run in-memory or against different technologies for better debugging experiences or local execution.
• Provide better local development experiences, e.g. replace Azure Blob Storage with the local file system or an in-memory implementation.

In your application root, create an IBlobStorage instance with an actual implementation package and retrieve a blob container:

var storage = AzureBlobStorage.CreateFromConnectionString("MyConnectionString");
IBlobContainer container = storage.GetContainer("MyContainer");
IBlobContainer<Person> typedContainer = container.WithBlobType<Person>();

await typedContainer.WriteJsonAsync("MyPath", new Person { ... });
var person = await typedContainer.ReadJsonAsync("MyPath");

In your business service classes you should then only use the abstraction interfaces like IBlobContainer or IObjectStorage, etc.

Blobs

Inject IBlobStorage or IBlobContainer but do not get a container from a blob storage in the consuming class (violates SRP).

• IBlobStorage: A blob storage where blobs are stored in a container and cannot be directly stored. Only containerName/blobName or containerName/subDirectories/blobName are allowed.
• IBlobContainer<T>
• IBlobContainer: A blob container where blobs can be directly stored or in a subdirectory. A container acts like a simple/basic virtual file system.
  • OpenWriteAsync: Creates or overrides an existing blob
  • OpenAppendAsync: Creates or appends to an existing blob
  • OpenReadAsync
  • ExistsAsync
  • GetAsync
  • ListAsync
  • DeleteAsync: Deletes a blob
• BlobElement: Metadata and properties of a blob or container.

Internal:

• IBlobReader: Internal (do not use directly.)
• IBlobWriter: Internal (do not use directly.)

The idea behind the generic interfaces is to allow multiple instance registrations, read Dependency Injection in .NET: A way to work around missing named registrations for more information.

Objects

• IObjectStorage<T>
  • WriteAsync(id, value)
  • ReadAsync(id)
  • DeleteAsync(id)

Extension methods:

• WriteAsJson(): Writes an object as JSON into a blob container/storage.
• ReadAsJson(): Reads an object as JSON from a blob container/storage.
• CreateJsonObjectStorage<T>(): Creates an IObjectStorage<T> for a given IBlobContainer. Usage: var objectStorage = blobContainer.CreateJsonObjectStorage<Person>().

The following packages should only be used in the head project, i.e. directly in your application bootstrapping project where the dependency injection container is initialized.

Implementations:

• FileSystemBlobStorage
• InMemoryBlobStorage

Extensions:

• WithBlobType<T>(): Adds a blob type to an IBlobStorage/IBlobContainer and transforms it into a IBlobStorage<T>/IBlobContainer<T>.
• Wrap<T>()/Wrap(): Adds an interceptor to the blob storage (blobStorage.Wrap(s => new MyInterceptor(s))). An interceptor can be implemented as a new class inheriting from the BlobStorage class and overriding some methods.

Implementations:

• AzureBlobStorage

Implementations:

• FtpBlobStorage