org.mule.api.transport
Interfaces 
Connectable
Connector
InternalMessageListener
MessageDispatcher
MessageDispatcherFactory
MessageDispatching
MessageReceiver
MessageRequester
MessageRequesterFactory
MessageRequesting
MuleMessageFactory
OutputHandler
ReplyToHandler
SessionHandler
Classes 
PropertyScope
PropertyScope.ScopeComparator
Exceptions 
ConnectorException
DispatchException
MessageTypeNotSupportedException
NoReceiverForEndpointException
ReceiveException