| Interface | Description | 
|---|---|
| MessageMonitor<T extends Message<?>> | 
 Specifies a mechanism to monitor message processing. 
 | 
| MessageMonitor.MonitorCallback | 
 An interface to let the message processor inform the message monitor of the result
 of processing the message 
 | 
| Class | Description | 
|---|---|
| MultiMessageMonitor<T extends Message<?>> | 
 Delegates messages and callbacks to the given list of message monitors 
 | 
| Enum | Description | 
|---|---|
| NoOpMessageMonitor | 
 A message monitor that returns a NoOp message callback 
 | 
| NoOpMessageMonitorCallback | 
 A NoOp MessageMonitor callback 
 | 
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