# IDurableValueCommandCodec<T> Methods

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.idurablevaluecommandcodec-1/)

## Apply(JournalBufferReader, IDurableValueCommandHandler<T>) {#apply-orleans-journaling-journalbufferreader-orleans-journaling-idurablevaluecom-ff5c8e49}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.idurablevaluecommandcodec-1/methods/apply-orleans-journaling-journalbufferreader-orleans-journaling-idurablevaluecom-ff5c8e49/)

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

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

### Parameters

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

## WriteSet(T, JournalStreamWriter) {#writeset-t-orleans-journaling-journalstreamwriter-a77b5e74}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.journaling/orleans.journaling.idurablevaluecommandcodec-1/methods/writeset-t-orleans-journaling-journalstreamwriter-a77b5e74/)

```csharp
public abstract void WriteSet(T value, JournalStreamWriter writer)
```

Writes a set command.

### Parameters

- `value` (`T`)
- `writer` (`JournalStreamWriter`)