org.jivesoftware.wildfire.pubsub
Class PubSubModule

java.lang.Object
  org.jivesoftware.wildfire.container.BasicModule
      org.jivesoftware.wildfire.pubsub.PubSubModule

All Implemented Interfaces:

ChannelHandler, Module, DiscoInfoProvider, DiscoItemsProvider, ServerItemsProvider, PubSubService, RoutableChannelHandler

public class PubSubModule
extends BasicModule
implements ServerItemsProvider, DiscoInfoProvider, DiscoItemsProvider, RoutableChannelHandler, PubSubService

Module that implements JEP-60: Publish-Subscribe. By default node collections and instant nodes are supported.

Author:

Matt Tucker

Constructor Summary

PubSubModule()

Method Summary

void	addNode(Node node) Adds an already persistent node to the service.
void	addSysadmin(String userJID)
void	addUserAllowedToCreate(String userJID)
void	broadcast(Node node, Message message, Collection<JID> jids) Broadcasts the specified Message containing an event notification to a list of subscribers to the specified node.
boolean	canCreateNode(JID creator) Returns true if the pubsub service allows the specified user to create nodes.
JID	getAddress() Returns the XMPP address of the service.
DefaultNodeConfiguration	getDefaultNodeConfiguration(boolean leafType) Returns the default node configuration for the specified node type or null if the specified node type is not supported by the service.
XDataFormImpl	getExtendedInfo(String name, String node, JID senderJID) Returns an XDataForm with the extended information about the entity or null if none.
Iterator<String>	getFeatures(String name, String node, JID senderJID) Returns an Iterator (of String) with the supported features.
Iterator<org.dom4j.Element>	getIdentities(String name, String node, JID senderJID) Returns an Iterator (of Element) with the target entity's identities.
Iterator<DiscoServerItem>	getItems() Returns an Iterator (of DiscoServerItem) with the items associated with the server or null if none.
Iterator<org.dom4j.Element>	getItems(String name, String node, JID senderJID) Returns an Iterator (of Element) with the target entity's items or null if none.
Node	getNode(String nodeID) Returns the Node that matches the specified node ID or null if none was found.
Collection<Node>	getNodes() Retuns the collection of nodes hosted by the pubsub service.
PubSubEngine	getPubSubEngine() Returns the pubsub engine responsible for handling packets sent to the pub-sub service.
CollectionNode	getRootCollectionNode() Returns the CollectionNode that acts as the root node of the entire node hierarchy.
String	getServiceDomain()
String	getServiceID() Returns a String that uniquely identifies this pubsub service.
String	getServiceName()
Collection<String>	getShowPresences(JID subscriber) Returns the show values of the last know presence of all connected resources of the specified subscriber.
Collection<String>	getSysadmins()
Collection<String>	getUsersAllowedToCreate()
boolean	hasInfo(String name, String node, JID senderJID) Returns true if we can provide information related to the requested name and node.
void	initialize(XMPPServer server) Initializes the basic module.
boolean	isCollectionNodesSupported() Returns true if the pubsub service supports collection nodes.
boolean	isInstantNodeSupported() Returns true if the pubsub service allows users to create nodes without specifying the node ID.
boolean	isMultipleSubscriptionsEnabled() Returns true if a user may have more than one subscription with the node.
boolean	isNodeCreationRestricted()
boolean	isServiceAdmin(JID user) Returns true if the specified user is a sysadmin of the pubsub service or has admin privileges.
void	presenceSubscriptionNotRequired(Node node, JID user) Requests the pubsub service to unsubscribe from the presence of the user.
void	presenceSubscriptionRequired(Node node, JID user) Requests the pubsub service to subscribe to the presence of the user.
void	process(Packet packet) Process an XMPP packet.
void	removeNode(String nodeID) Removes the specified node from the service.
void	removeSysadmin(String userJID)
void	removeUserAllowedToCreate(String userJID)
void	send(Packet packet) Sends the specified packet.
void	sendNotification(Node node, Message message, JID jid) Sends the specified Message containing an event notification to a specific subscriber of the specified node.
void	setNodeCreationRestricted(boolean nodeCreationRestricted)
void	start() Starts the basic module.
void	stop() Stops the basic module.

Methods inherited from class org.jivesoftware.wildfire.container.BasicModule

destroy, getName

Methods inherited from class java.lang.Object

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

Constructor Detail

PubSubModule

public PubSubModule()

Method Detail

process

public void process(Packet packet)

Description copied from interface: ChannelHandler

Process an XMPP packet.

Specified by:

process in interface ChannelHandler

Parameters:

packet - a packet to process.

getServiceID

public String getServiceID()

Description copied from interface: PubSubService

Returns a String that uniquely identifies this pubsub service. This information is being used when storing node information in the database so it's possible to have nodes with the same ID but under different pubsub services.

Specified by:

getServiceID in interface PubSubService

Returns:

a String that uniquely identifies this pubsub service.

canCreateNode

public boolean canCreateNode(JID creator)

Description copied from interface: PubSubService

Returns true if the pubsub service allows the specified user to create nodes.

Specified by:

canCreateNode in interface PubSubService

Parameters:

creator - the JID of the entity trying to create a new node.

Returns:

true if the pubsub service allows the specified user to create nodes.

isServiceAdmin

public boolean isServiceAdmin(JID user)

Description copied from interface: PubSubService

Returns true if the specified user is a sysadmin of the pubsub service or has admin privileges.

Specified by:

isServiceAdmin in interface PubSubService

Parameters:

user - the user to check if he has admin privileges.

Returns:

true if the specified user is a sysadmin of the pubsub service or has admin privileges.

isInstantNodeSupported

public boolean isInstantNodeSupported()

Description copied from interface: PubSubService

Returns true if the pubsub service allows users to create nodes without specifying the node ID. The service will create a random node ID and assigne it to the node.

Specified by:

isInstantNodeSupported in interface PubSubService

Returns:

true if the pubsub service allows users to create nodes without specifying the node ID.

isCollectionNodesSupported

public boolean isCollectionNodesSupported()

Description copied from interface: PubSubService

Returns true if the pubsub service supports collection nodes. When collection nodes is supported it is possible to create hierarchy of nodes where a CollectionNode may only hold children nodes of type CollectionNode or LeafNode. On the other hand, LeafNode can only hold PublishedItem.

Specified by:

isCollectionNodesSupported in interface PubSubService

Returns:

true if the pubsub service supports collection nodes.

getRootCollectionNode

public CollectionNode getRootCollectionNode()

Description copied from interface: PubSubService

Returns the CollectionNode that acts as the root node of the entire node hierarchy. The returned node does not have a node identifier. If collection nodes is not supported then return null.

Specified by:

getRootCollectionNode in interface PubSubService

Returns:

the CollectionNode that acts as the root node of the entire node hierarchy or null if collection nodes is not supported.

getDefaultNodeConfiguration

public DefaultNodeConfiguration getDefaultNodeConfiguration(boolean leafType)

Description copied from interface: PubSubService

Returns the default node configuration for the specified node type or null if the specified node type is not supported by the service.

Specified by:

getDefaultNodeConfiguration in interface PubSubService

Parameters:

leafType - true when requesting default configuration of leaf nodes

Returns:

the default node configuration for the specified node type or null if the specified node type is not supported by the service.

getShowPresences

public Collection<String> getShowPresences(JID subscriber)

Description copied from interface: PubSubService

Returns the show values of the last know presence of all connected resources of the specified subscriber. When the subscriber JID is a bare JID then the answered collection will have many entries one for each connected resource. Moreover, if the user is offline then an empty collectin is returned. Available show status is represented by a online value. The rest of the possible show values as defined in RFC 3921.

Specified by:

getShowPresences in interface PubSubService

Parameters:

subscriber - the JID of the subscriber. This is not the JID of the affiliate.

Returns:

an empty collection when offline. Otherwise, a collection with the show value of each connected resource.

presenceSubscriptionNotRequired

public void presenceSubscriptionNotRequired(Node node,
                                            JID user)

Description copied from interface: PubSubService

Requests the pubsub service to unsubscribe from the presence of the user. If the service was not subscribed to the user's presence or any node still requires to be subscribed to the user presence then do nothing.

Specified by:

presenceSubscriptionNotRequired in interface PubSubService

Parameters:

node - the node that originated the unsubscription request.

user - the JID of the affiliate to unsubscribe from his presence.

presenceSubscriptionRequired

public void presenceSubscriptionRequired(Node node,
                                         JID user)

Description copied from interface: PubSubService

Requests the pubsub service to subscribe to the presence of the user. If the service has already subscribed to the user's presence then do nothing.

Specified by:

presenceSubscriptionRequired in interface PubSubService

Parameters:

node - the node that originated the subscription request.

user - the JID of the affiliate to subscribe to his presence.

getPubSubEngine

public PubSubEngine getPubSubEngine()

Description copied from interface: PubSubService

Returns the pubsub engine responsible for handling packets sent to the pub-sub service. The engine is the actual place where the pubsub magic happens like creating nodes, publishing items or subscribing to nodes.

Specified by:

getPubSubEngine in interface PubSubService

Returns:

the pubsub engine responsible for handling packets sent to the pub-sub service.

getServiceName

public String getServiceName()

getServiceDomain

public String getServiceDomain()

getAddress

public JID getAddress()

Description copied from interface: PubSubService

Returns the XMPP address of the service.

Specified by:

getAddress in interface PubSubService

Specified by:

getAddress in interface RoutableChannelHandler

Returns:

the XMPP address of the service.

getUsersAllowedToCreate

public Collection<String> getUsersAllowedToCreate()

getSysadmins

public Collection<String> getSysadmins()

addSysadmin

public void addSysadmin(String userJID)

removeSysadmin

public void removeSysadmin(String userJID)

isNodeCreationRestricted

public boolean isNodeCreationRestricted()

isMultipleSubscriptionsEnabled

public boolean isMultipleSubscriptionsEnabled()

Description copied from interface: PubSubService

Returns true if a user may have more than one subscription with the node. When multiple subscriptions is enabled each subscription request, event notification and unsubscription request should include a subid attribute.

Specified by:

isMultipleSubscriptionsEnabled in interface PubSubService

Returns:

true if a user may have more than one subscription with the node.

setNodeCreationRestricted

public void setNodeCreationRestricted(boolean nodeCreationRestricted)

addUserAllowedToCreate

public void addUserAllowedToCreate(String userJID)

removeUserAllowedToCreate

public void removeUserAllowedToCreate(String userJID)

initialize

public void initialize(XMPPServer server)

Description copied from class: BasicModule

Initializes the basic module.

Inheriting classes that choose to override this method MUST call this initialize() method before accessing BasicModule resources.

Specified by:

initialize in interface Module

Overrides:

initialize in class BasicModule

Parameters:

server - the server hosting this module.

start

public void start()

Description copied from class: BasicModule

Starts the basic module.

Inheriting classes that choose to override this method MUST call this start() method before accessing BasicModule resources.

Specified by:

start in interface Module

Overrides:

start in class BasicModule

stop

public void stop()

Description copied from class: BasicModule

Stops the basic module.

Inheriting classes that choose to override this method MUST call this stop() method before accessing BasicModule resources.

Specified by:

stop in interface Module

Overrides:

stop in class BasicModule

getItems

public Iterator<DiscoServerItem> getItems()

Description copied from interface: ServerItemsProvider

Returns an Iterator (of DiscoServerItem) with the items associated with the server or null if none.

Specified by:

getItems in interface ServerItemsProvider

Returns:

an Iterator (of DiscoServerItem) with the items associated with the server or null if none.

getIdentities

public Iterator<org.dom4j.Element> getIdentities(String name,
                                                 String node,
                                                 JID senderJID)

Description copied from interface: DiscoInfoProvider

Returns an Iterator (of Element) with the target entity's identities. Each Element must include the categoty, type and name attributes of the entity.

Specified by:

getIdentities in interface DiscoInfoProvider

Parameters:

name - the recipient JID's name.

node - the requested disco node.

senderJID - the XMPPAddress of user that sent the disco info request.

Returns:

an Iterator (of Element) with the target entity's identities.

getFeatures

public Iterator<String> getFeatures(String name,
                                    String node,
                                    JID senderJID)

Description copied from interface: DiscoInfoProvider

Returns an Iterator (of String) with the supported features. The features to include are the features offered and supported protocols by the target entity identified by the requested name and node.

Specified by:

getFeatures in interface DiscoInfoProvider

Parameters:

name - the recipient JID's name.

node - the requested disco node.

senderJID - the XMPPAddress of user that sent the disco info request.

Returns:

an Iterator (of String) with the supported features.

getExtendedInfo

public XDataFormImpl getExtendedInfo(String name,
                                     String node,
                                     JID senderJID)

Description copied from interface: DiscoInfoProvider

Returns an XDataForm with the extended information about the entity or null if none. Each bit of information about the entity must be included as a value of a field of the form.

Specified by:

getExtendedInfo in interface DiscoInfoProvider

Parameters:

name - the recipient JID's name.

node - the requested disco node.

senderJID - the XMPPAddress of user that sent the disco info request.

Returns:

an XDataForm with the extended information about the entity or null if none.

hasInfo

public boolean hasInfo(String name,
                       String node,
                       JID senderJID)

Description copied from interface: DiscoInfoProvider

Returns true if we can provide information related to the requested name and node. For example, if the requested name refers to a non-existant MUC room then the answer will be false. In case that the sender of the disco request is not authorized to discover this information an UnauthorizedException will be thrown.

Specified by:

hasInfo in interface DiscoInfoProvider

Parameters:

name - the recipient JID's name.

node - the requested disco node.

senderJID - the XMPPAddress of user that sent the disco info request.

Returns:

true if we can provide information related to the requested name and node.

getItems

public Iterator<org.dom4j.Element> getItems(String name,
                                            String node,
                                            JID senderJID)

Description copied from interface: DiscoItemsProvider

Returns an Iterator (of Element) with the target entity's items or null if none. Each Element must include a JID attribute and may include the name and node attributes of the entity. In case that the sender of the disco request is not authorized to discover items an UnauthorizedException will be thrown.

Specified by:

getItems in interface DiscoItemsProvider

Parameters:

name - the recipient JID's name.

node - the requested disco node.

senderJID - the XMPPAddress of user that sent the disco items request.

Returns:

an Iterator (of Element) with the target entity's items or null if none.

broadcast

public void broadcast(Node node,
                      Message message,
                      Collection<JID> jids)

Description copied from interface: PubSubService

Broadcasts the specified Message containing an event notification to a list of subscribers to the specified node. Each message being sent has to have a unique ID value so that the service can properly track any notification-related errors that may occur.

Specified by:

broadcast in interface PubSubService

Parameters:

node - the node that triggered the event notification.

message - the message containing the event notification.

jids - the list of entities to get the event notification.

send

public void send(Packet packet)

Description copied from interface: PubSubService

Sends the specified packet.

Specified by:

send in interface PubSubService

Parameters:

packet - the packet to send.

sendNotification

public void sendNotification(Node node,
                             Message message,
                             JID jid)

Description copied from interface: PubSubService

Sends the specified Message containing an event notification to a specific subscriber of the specified node. The message being sent has to have a unique ID value so that the service can properly track any notification-related errors that may occur.

Specified by:

sendNotification in interface PubSubService

Parameters:

node - the node that triggered the event notification.

message - the message containing the event notification.

jid - the entity to get the event notification.

getNode

public Node getNode(String nodeID)

Description copied from interface: PubSubService

Returns the Node that matches the specified node ID or null if none was found.

Specified by:

getNode in interface PubSubService

Parameters:

nodeID - the ID that uniquely identifies the node in the pubsub service.

Returns:

the Node that matches the specified node ID or null if none was found.

getNodes

public Collection<Node> getNodes()

Description copied from interface: PubSubService

Retuns the collection of nodes hosted by the pubsub service. The collection does not support modifications.

Specified by:

getNodes in interface PubSubService

Returns:

the collection of nodes hosted by the pubsub service.

addNode

public void addNode(Node node)

Description copied from interface: PubSubService

Adds an already persistent node to the service.

Specified by:

addNode in interface PubSubService

Parameters:

node - the persistent node to add to the service.

removeNode

public void removeNode(String nodeID)

Description copied from interface: PubSubService

Removes the specified node from the service. Most probaly the node was deleted from the database as well.

A future version may support unloading of inactive nodes even though they may still exist in the database.

Specified by:

removeNode in interface PubSubService

Parameters:

nodeID - the ID that uniquely identifies the node in the pubsub service.