com.vaadin.collaborationengine.PresenceHandler API 23.1.17 | Vaadin

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com.vaadin.collaborationengine.

All Superinterfaces:

Serializable

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 interface PresenceHandler
extends Serializable
```
Functional interface that defines how to handle user presence changes in a topic.

Since:

4.0

Author:

Vaadin Ltd

See Also:

PresenceManager.setPresenceHandler(PresenceHandler)

- Nested Class Summary
  
  Nested Classes
  Modifier and Type Interface Description
  
  static interface PresenceHandler.PresenceContext
  The context of the user presence.
- Method Summary
  
  All Methods
  Modifier and Type Method Description
  
  Registration handlePresence(PresenceHandler.PresenceContext context)
  Handles a change of user presence in a topic.

- Method Detail
  - handlePresence
```
Registration handlePresence(PresenceHandler.PresenceContext context)
```
    Handles a change of user presence in a topic.
    
    Parameters:
    
    context - the context of the user presence, not null
    
    Returns:
    
    a registration that will be removed when the user stops being present