# IEvictionStrategy

Package: [Microsoft.Orleans.Streaming](/orleans/docs/api/csharp/microsoft.orleans.streaming/) 10.0.0

[NuGet package](https://www.nuget.org/packages/Microsoft.Orleans.Streaming)

```csharp
public interface IEvictionStrategy
```

Eviction strategy for the PooledQueueCache

## Properties

- [OnPurged](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ievictionstrategy/properties/onpurged-7d6d1201/)
- [PurgeObservable](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ievictionstrategy/properties/purgeobservable-2736b31e/)

## Methods

- [OnBlockAllocated(FixedSizeBuffer)](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ievictionstrategy/methods/onblockallocated-orleans-providers-streams-common-fixedsizebuffer-dd1fc9b7/)
- [PerformPurge(DateTime)](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.providers.streams.common.ievictionstrategy/methods/performpurge-system-datetime-f28007b5/)