| Interface | Description | 
|---|---|
| NotificationService | 
 Sends a notification to a set of receivers. 
 | 
| Class | Description | 
|---|---|
| Notification | 
 A notification is a message that is sent to different receivers. 
 | 
| NotificationServiceImpl | 
 Default implementation of  
NotificationService. | 
| NotificationTarget | 
 A target to send a notification to. 
 | 
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