# JsonPersistentStateCommandCodec<T>.Apply(JournalBufferReader, IPersistentStateCommandHandler<T>)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.json.jsonpersistentstatecommandcodec-1/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.json.jsonpersistentstatecommandcodec-1/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Journaling/Formats/Json/JsonDurableValueCommandCodecs.cs#L90-L99)

```csharp
public void Apply(JournalBufferReader input, IPersistentStateCommandHandler<T> consumer)
```

Reads one encoded command and applies it to `consumer`.

### Parameters

- `input` (`JournalBufferReader`)
- `consumer` (`IPersistentStateCommandHandler<T>`)