Package org.cometd.bayeux.server

Interface ServerChannel

All Superinterfaces:

Channel, ConfigurableServerChannel

All Known Implementing Classes:

ServerChannelImpl

public interface ServerChannel
extends ConfigurableServerChannel

Server side representation of a Bayeux channel.

ServerChannel is the entity that holds a set of ServerSessions that are subscribed to the channel itself.

A message published to a ServerChannel will be delivered to all the ServerSession's subscribed to the channel.

Contrary to their client side counterpart (ClientSessionChannel) a ServerChannel is not scoped with a session.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	ServerChannel.MessageListener	Listeners objects that implement this interface will be notified of message publish.
static interface	ServerChannel.SubscriptionListener	Listener objects that implement this interface will be notified of subscription events.

Nested classes/interfaces inherited from interface org.cometd.bayeux.server.ConfigurableServerChannel

ConfigurableServerChannel.Initializer, ConfigurableServerChannel.ServerChannelListener

Field Summary

Fields inherited from interface org.cometd.bayeux.Channel

META, META_CONNECT, META_DISCONNECT, META_HANDSHAKE, META_SUBSCRIBE, META_UNSUBSCRIBE, SERVICE

Method Summary

Modifier and Type	Method	Description
Set<ServerSession>	getSubscribers()
void	publish(Session from, Object data, Promise<Boolean> promise)	Publishes the given information to this channel.
void	publish(Session from, ServerMessage.Mutable message, Promise<Boolean> promise)	Publishes the given message to this channel, delivering the message to all the ServerSessions subscribed to this channel.
void	remove()	Removes this channel, and all the children channels.
boolean	subscribe(ServerSession session)	Subscribes the given session to this channel.
boolean	unsubscribe(ServerSession session)	Unsubscribes the given session from this channel.

Methods inherited from interface org.cometd.bayeux.Channel

getAttribute, getAttributeNames, getChannelId, getId, isBroadcast, isDeepWild, isMeta, isService, isWild, removeAttribute, setAttribute

Methods inherited from interface org.cometd.bayeux.server.ConfigurableServerChannel

addAuthorizer, addListener, getAuthorizers, getLazyTimeout, getListeners, isBroadcastToPublisher, isLazy, isPersistent, removeAuthorizer, removeListener, setBroadcastToPublisher, setLazy, setLazyTimeout, setPersistent

Method Details

getSubscribers

Set<ServerSession> getSubscribers()

Returns:

a snapshot of the set of subscribers of this channel

subscribe

boolean subscribe(ServerSession session)

Subscribes the given session to this channel.

Subscriptions are effective for broadcast channels and are successful no-operations for service channels.

The subscription may fail if the session is already subscribed to the channel or if the session is expired or if the channel is a meta channel.

Parameters:

session - the session to subscribe

Returns:

whether the subscription succeeded

See Also:

• unsubscribe(ServerSession)

unsubscribe

boolean unsubscribe(ServerSession session)

Unsubscribes the given session from this channel.

Unsubscriptions are effective for broadcast channels and are successful no-operations for service channels.

The unsubscription may fail if the session is already unsubscribed from the channel or if the session is expired or if the channel is a meta channel.

Parameters:

session - the session to unsubscribe

Returns:

whether the unsubscription succeeded

publish

void publish(Session from,
 ServerMessage.Mutable message,
 Promise<Boolean> promise)

Publishes the given message to this channel, delivering the message to all the ServerSessions subscribed to this channel.

Parameters:

from - the session from which the message originates

message - the message to publish

promise - the promise to notify whether the message has been published

See Also:

• publish(Session, Object, Promise)

publish

void publish(Session from,
 Object data,
 Promise<Boolean> promise)

Publishes the given information to this channel.

Parameters:

from - the session from which the message originates

data - the data of the message

promise - the promise to notify whether the message has been published

See Also:

• publish(Session, ServerMessage.Mutable, Promise)

remove

void remove()

Removes this channel, and all the children channels.

If channel "/foo", "/foo/bar" and "/foo/blip" exist, removing channel "/foo" will remove also "/foo/bar" and "/foo/blip".

The removal will notify BayeuxServer.ChannelListener listeners.