PollNotifier (Vaadin Platform (vaadin-platform-javadoc) 23.3.32 API)

All Superinterfaces:

Serializable

All Known Implementing Classes:

JavaScriptBootstrapUI, UI, WebComponentUI
```
public interface PollNotifier
extends Serializable
```
The interface for adding and removing 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:

1.0

See Also:

UI.setPollInterval(int)

- Method Summary
  
  All Methods Instance Methods Default Methods
  Modifier and Type Method Description
  
  default Registration addPollListener(ComponentEventListener<PollEvent> listener)
  Add a poll listener.

- Method Detail
  - addPollListener
```
default Registration addPollListener(ComponentEventListener<PollEvent> listener)
```
    Add a poll listener.
    The listener is called whenever the client polls the server for asynchronous UI updates.
    
    Parameters:
    
    listener - the listener to add
    
    Returns:
    
    a handle that can be used for removing the listener
    
    See Also:
    
    UI.setPollInterval(int)