AccessoryWithVolume (hap-java 2.0.2 API)

```
public interface AccessoryWithVolume
```
Accessory with volume values.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`CompletableFuture<Integer>`	`getVolume()`	Retrieves the current volume
`CompletableFuture<Void>`	`setVolume(Integer value)`	Sets the current volume
`void`	`subscribeVolume(HomekitCharacteristicChangeCallback callback)`	Subscribes to changes in the volume.
`void`	`unsubscribeVolume()`	Unsubscribes from changes in the volume.

- Method Detail
  - getVolume
```
CompletableFuture<Integer> getVolume()
```
    Retrieves the current volume
    
    Returns:
    
    a future that will contain the volume, expressed as an integer between 0 and 100.
  - setVolume
```
CompletableFuture<Void> setVolume(Integer value)
                           throws Exception
```
    Sets the current volume
    
    Parameters:
    
    value - the volume, on a scale of 0 to 100, to set
    
    Returns:
    
    a future that completes when the volume is changed
    
    Throws:
    
    Exception - when the volume cannot be set
  - subscribeVolume
```
void subscribeVolume(HomekitCharacteristicChangeCallback callback)
```
    Subscribes to changes in the volume.
    
    Parameters:
    
    callback - the function to call when the state changes.
  - unsubscribeVolume
```
void unsubscribeVolume()
```
    Unsubscribes from changes in the volume.