Acknowledgement (messaging 3.8.9 API)

```
public interface Acknowledgement
```
A contract that allows for responding to messages.

Since:

1.1.0

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void ack()
  Acknowledges the message.
  
  void nack()
  Rejects the message.

- Method Detail
  - ack
```
void ack()
  throws MessageAcknowledgementException
```
    Acknowledges the message.
    
    Throws:
    
    MessageAcknowledgementException - if an error occurred acknowledging the message
  - nack
```
void nack()
   throws MessageAcknowledgementException
```
    Rejects the message.
    
    Throws:
    
    MessageAcknowledgementException - if an error occurred rejecting the message