Update dependency Autofac to 9.1.0

[dependencyupdates]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Autofac (source)	9.0.0 → 9.1.0

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Release Notes

autofac/Autofac (Autofac)

v9.1.0

This is a pretty big release for Autofac with some major new functionality!

AnyKey Support

First, Autofac now natively supports the concept of AnyKey. It behaves the same way AnyKey works in Microsoft.Extensions.DependencyInjection, but it is native to Autofac directly. The unit tests here show some very detailed examples of usage, but on a high level:

var builder = new ContainerBuilder();
builder.RegisterType<Service>().Keyed<IService>(KeyedService.AnyKey);

var container = builder.Build();

// Registering as AnyKey allows it to respond to... any key!
var service = container.ResolveKeyed<IService>("service1");

Inject Service Key Into Constructors

The new [ServiceKey] attribute allows you to inject the service key provided during resolution. This is handy in conjunction with AnyKey. Again, this is similar to the construct in Microsoft.Extensions.DependencyInjection, but with native Autofac.

First, mark up your class to take the constructor parameter.

public class Service : IService
{
  private readonly string _id;
  public Service([ServiceKey] string id) => _id = id;
}

Then when you resolve the class, the service key will automatically be injected.

You can also make use of this in a lambda registration.

var builder = new ContainerBuilder();
builder.Register<Service>((ctx, p) => {
  var key = p.TryGetKeyedServiceKey(out string value) ? value : null;
  return new Service(key);
}).Keyed<Service>(KeyedService.AnyKey);

Metrics

Some metrics have been introduced that can allow you to capture counters on how long middleware is taking, how often lock contention occurs, and so on.

Set the AUTOFAC_METRICS environment variable in your process to true or 1 to enable this feature. You can see the set of counters that will become available here.

⚠️ This is NOT FREE. Collecting counters and metrics will incur a performance hit, so it's not something you want to leave on in production.

General Performance Improvements

A pass over the whole system was made with an eye to trying to claw back some performance. Some additional caching was introduced to help reduce lookups and calculations of reflection data; and a few hot-path optimizations were made for the common situations.

Full Changelog: autofac/Autofac@v9.0.0...v9.1.0

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