| Interface | Description | 
|---|---|
| MessageChannelEvent | Describes events when a involving a  Textmessage andMessageChannels. | 
| MessageChannelEvent.Chat | Fired when the  Textbeing sent to aMessageChannelwas
 due to chatting. | 
| MessageEvent | Describes events when a involving a  Textmessage. | 
| Class | Description | 
|---|---|
| MessageEvent.DefaultBodyApplier | Represents the initial body set by the implementation before the event
 is posted. | 
| MessageEvent.DefaultHeaderApplier | Represents the initial header set by the implementation before the event
 is posted. | 
| MessageEvent.MessageFormatter | Formatter used for formatting messages within this event. |