com.liferay.portal.kernel.notifications
Interfaces 
Channel
ChannelHub
ChannelHubManager
ChannelHubManagerListener
ChannelListener
NotificationEventFactory
UserNotificationHandler
UserNotificationManager
Classes 
BaseChannelImpl
BaseUserNotificationHandler
ChannelHubManagerUtil
NotificationEvent
NotificationEventComparator
NotificationEventFactoryUtil
UserNotificationDefinition
UserNotificationDeliveryType
UserNotificationFeedEntry
UserNotificationManagerUtil
Exceptions 
ChannelException
DuplicateChannelException
DuplicateChannelHubException
DuplicateChannelListenerException
UnknownChannelException
UnknownChannelHubException