| Interface | Description | 
|---|---|
| CommerceMessage | 
  This is the base interface for all the messages used in this system. 
 | 
| Class | Description | 
|---|---|
| CommerceMessageImpl | 
  This is an implementation of the CommerceMessage interface. 
 | 
| MessageForwardFilter | 
 The MessageForwardFilter can be used to take messages from one message source and
 forward it to one or more message sinks. 
 | 
| MessageSender | 
 This class is a generci MessageSender. 
 | 
| SourceSinkTemplate | 
 This class handles the sending and receiving of 
 CommerceMessage. 
 |