Package com.vaadin.collaborationengine

Class PresenceManager

java.lang.Object

com.vaadin.collaborationengine.AbstractCollaborationManager

com.vaadin.collaborationengine.PresenceManager

public class PresenceManager
extends AbstractCollaborationManager

Manager to handle user presence in topics. It allows to set the user presence in the set topic and get a list of users currently set as present in the same topic. A handler can be set to react when the presence of a user changes.

Since:

3.2

Author:

Vaadin Ltd

Nested Class Summary

Nested classes/interfaces inherited from class com.vaadin.collaborationengine.AbstractCollaborationManager

AbstractCollaborationManager.ActivationHandler

Constructor Summary

Constructors

Constructor	Description
PresenceManager(ConnectionContext context, UserInfo localUser, String topicId, CollaborationEngine collaborationEngine)	Creates a new manager for the provided connection context.
PresenceManager(Component component, UserInfo localUser, String topicId)	Creates a new manager for the provided component.

Method Summary

Modifier and Type	Method	Description
void	markAsPresent(boolean markAsPresent)	Configures the manager to mark the local user present in the topic.
void	setPresenceHandler(PresenceHandler handler)	Sets a handler which will be invoked when a user becomes present.

Methods inherited from class com.vaadin.collaborationengine.AbstractCollaborationManager

close, getCollaborationEngine, getLocalUser, getTopicId, onConnectionFailed, openTopicConnection, setActivationHandler

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PresenceManager

public PresenceManager(Component component,
 UserInfo localUser,
 String topicId)

Creates a new manager for the provided component.

The provided user information is used to set the presence of the local user with markAsPresent(boolean) (the default is false).

Parameters:

component - the component which holds UI access, not null

localUser - the information of the local user, not null

topicId - the id of the topic to connect to, not null

PresenceManager

public PresenceManager(ConnectionContext context,
 UserInfo localUser,
 String topicId,
 CollaborationEngine collaborationEngine)

Creates a new manager for the provided connection context.

The provided user information is used to set the presence of the local user with markAsPresent(boolean) (the default is false).

Parameters:

context - the context that manages connection status, not null

localUser - the information of the local user, not null

topicId - the id of the topic to connect to, not null

collaborationEngine - the collaboration engine instance to use, not null

Method Details

markAsPresent

public void markAsPresent(boolean markAsPresent)

Configures the manager to mark the local user present in the topic.

If the user wasn't already present in the topic, all managers connected to the same topic will be notified of the change and their handlers will be applied to the user instance.

Parameters:

markAsPresent - true to mark the user as present in the topic, false to set as not present

setPresenceHandler

public void setPresenceHandler(PresenceHandler handler)

Sets a handler which will be invoked when a user becomes present.

The handler accepts a PresenceHandler.PresenceContext instance as a parameter and should return a Registration which will be removed when the user stops being present.

Replacing an existing handler will remove all registrations from the previous one.

Parameters:

handler - the user presence handler, or null to remove an existing handler