com.vaadin.collaborationengine

Interface PresenceHandler

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 and Description
static interface	PresenceHandler.PresenceContext The context of the user presence.

Method Summary

Modifier and Type	Method and 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