Upload.ProgressListener (vaadin-server 8.31-SNAPSHOT API)

All Superinterfaces:

Serializable

Enclosing class:

Upload

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public static interface Upload.ProgressListener
extends Serializable
```
ProgressListener receives events to track progress of upload.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void updateProgress(long readBytes, long contentLength)
  Updates progress to listener.

- Method Detail
  - updateProgress
```
void updateProgress(long readBytes,
                    long contentLength)
```
    Updates progress to listener.
    
    Parameters:
    
    readBytes - bytes transferred
    
    contentLength - total size of file currently being uploaded, -1 if unknown