See: Description
| Interface | Description | 
|---|---|
| Message<T> | 
 A generic message representation with headers and body. 
 | 
| MessageChannel | 
 Defines methods for sending messages. 
 | 
| MessageHandler | 
 Contract for handling a  
Message. | 
| PollableChannel | 
 A  
MessageChannel from which messages may be actively received through polling. | 
| SubscribableChannel | 
 A  
MessageChannel that maintains a registry of subscribers and invokes
 them to handle messages sent through this channel. | 
| Class | Description | 
|---|---|
| MessageHeaders | 
 The headers for a  
Message. | 
| Exception | Description | 
|---|---|
| MessageDeliveryException | 
 Exception that indicates an error occurred during message delivery. 
 | 
| MessageHandlingException | 
 Exception that indicates an error occurred during message handling. 
 | 
| MessagingException | 
 The base exception for any failures related to messaging. 
 |