# ObserverManager<TIdentity, TObserver> Constructors

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.utilities.observermanager-2/)

## ObserverManager<TIdentity, TObserver>(TimeSpan, ILogger) {#constructor-system-timespan-microsoft-extensions-logging-ilogger-7078910e}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.utilities.observermanager-2/constructors/constructor-system-timespan-microsoft-extensions-logging-ilogger-7078910e/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Utils/ObserverManager.cs#L45-L73)

```csharp
public ObserverManager<TIdentity, ObserverManager(TimeSpan expiration, ILogger log)
```

Initializes a new instance of the `Orleans.Utilities.ObserverManager-2` class.

### Parameters

- `expiration` (`TimeSpan`): The expiration.
- `log` (`ILogger`): The log.