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Document ICurrentApp for getting the current app id #302

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22 changes: 22 additions & 0 deletions docs/user/app_model/app_model.md
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Expand Up @@ -134,6 +134,28 @@ public sealed class LifeTimeApp : IAsyncInitializable, IAsyncDisposable
}
```

### Knowing which app you are

Inject `ICurrentApp` to find out the id of the app that owns the current
dependency injection scope. This is useful when a service is shared between apps
and needs to pick up per-app configuration or logging.

```csharp
[NetDaemonApp]
public class MyApp
{
public MyApp(ICurrentApp currentApp, ILogger<MyApp> logger)
{
logger.LogInformation("Running as app {AppId}", currentApp.Id);
}
}
```

`ICurrentApp.Id` is the same id NetDaemon uses everywhere else: the `Id` set on
the `[NetDaemonApp]` attribute when present, otherwise the full name of the app
type. It can also be resolved from any other service that is registered in the
app's scope.

### Minimal app lifecycle events
A minimal app consists of just a single delegate. When the app is started, its parameters are resolved from the DI container and the delegate is invoked. A minimal app can implement async initialisation by providing an async delegate (that returns a Task, ValueTask, or other awaitable object) the runtime will the await its return value during initialisation.

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