| Interface | Description | 
|---|---|
| SampleListener | 
 This is the interface implemented by services that wish to
 receive Samples broadcast by a Sampler. 
 | 
| Class | Description | 
|---|---|
| MemorySampler | 
 A MemorySampler obtains samples from a Sampler and stores them
 in memory for display through the administrative UI. 
 | 
| Sample | 
 Represents a single sample taken of a service's property. 
 | 
| SampleEvent | 
 A SampleEvent represents a set of Samples from different
 properties all taken at about the same time. 
 | 
| SampleLogEvent | 
 A log event which represents a SampleEvent 
 | 
| Sampler | 
 A Sampler is the base class for services that wish to keep a
 list of statistics about other services. 
 | 
| SampleToLogEvent | 
 This provides a facility to direct SampleEvents to Log Listeners. 
 |