UIEvents.PollNotifier (vaadin-all 7.7.46 API)

All Superinterfaces:

Serializable

All Known Implementing Classes:

LegacyWindow, UI

Enclosing interface:

UIEvents
```
public static interface UIEvents.PollNotifier
extends Serializable
```
The interface for adding and removing UIEvents.PollEvent listeners.
By implementing this interface, a class publicly announces that it is able to send PollEvents whenever the client sends a periodic poll message to the client, to check for asynchronous server-side modifications.

Since:

7.2

See Also:

UI.setPollInterval(int)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addPollListener(UIEvents.PollListener listener)`	Add a poll listener.
`void`	`removePollListener(UIEvents.PollListener listener)`	Remove a poll listener.

- Method Detail
  - addPollListener
```
void addPollListener(UIEvents.PollListener listener)
```
    Add a poll listener.
    The listener is called whenever the client polls the server for asynchronous UI updates.
    
    Parameters:
    
    listener - the UIEvents.PollListener to add
    
    See Also:
    
    UI.setPollInterval(int), removePollListener(PollListener)
  - removePollListener
```
void removePollListener(UIEvents.PollListener listener)
```
    Remove a poll listener.
    
    Parameters:
    
    listener - the listener to be removed
    
    See Also:
    
    addPollListener(PollListener)