org.springframework.integration.channel
Interfaces 
ChannelInterceptor
ChannelResolver
PollableChannel
SubscribableChannel
Classes 
AbstractMessageChannel
AbstractPollableChannel
AbstractSubscribableChannel
BeanFactoryChannelResolver
ChannelPurger
DirectChannel
ExecutorChannel
MapBasedChannelResolver
MessageChannelTemplate
MessagePublishingErrorHandler
NullChannel
PriorityChannel
PublishSubscribeChannel
QueueChannel
RendezvousChannel
ThreadLocalChannel
Exceptions 
ChannelResolutionException