UIEvents.PollNotifier (vaadin-all 8.27.7 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 Deprecated Methods
Modifier and Type	Method	Description
`Registration`	`addPollListener(UIEvents.PollListener listener)`	Add a poll listener.
`void`	`removePollListener(UIEvents.PollListener listener)`	Deprecated. As of 8.0, replaced by `Registration.remove()` in the registration object returned from `addPollListener(PollListener)`.

- Method Detail
  - addPollListener
```
Registration 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, not null
    
    Returns:
    
    a registration object for removing the listener
    
    Since:
    
    8.0
    
    See Also:
    
    UI.setPollInterval(int), removePollListener(PollListener), Registration
  - removePollListener
```
@Deprecated
void removePollListener(UIEvents.PollListener listener)
```
    Deprecated.
    As of 8.0, replaced by Registration.remove() in the registration object returned from addPollListener(PollListener).
    
    Remove a poll listener.
    
    Parameters:
    
    listener - the listener to be removed
    
    See Also:
    
    addPollListener(PollListener)