DoneCallback (mu-server 2.1.20 API)

```
public interface DoneCallback
```
A callback for async operations that calls when an operation completes.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static DoneCallback NoOp
  A callback that does nothing on completion.
- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void onComplete(java.lang.Throwable error)
  The operation has completed.

- Field Detail
  - NoOp
```
static final DoneCallback NoOp
```
    A callback that does nothing on completion.
- Method Detail
  - onComplete
```
void onComplete(java.lang.Throwable error)
         throws java.lang.Exception
```
    The operation has completed.
    
    Parameters:
    
    error - If null, then the operation was a success. Otherwise it failed.
    
    Throws:
    
    java.lang.Exception - The result of throwing an exception depends on the operation, and may include actions such as disconnecting the client.