| Class | Description | 
|---|---|
| AppChecker | An interface for checking whether an app is running so that the cleaner
 service may determine if it can safely remove a cached entry. | 
| CleanerService | The cleaner service that maintains the shared cache area, and cleans up stale
 entries on a regular basis. | 
| ClientProtocolService | This service handles all rpc calls from the client to the shared cache
 manager. | 
| RemoteAppChecker | An implementation of AppChecker that queries the resource manager remotely to
 determine whether the app is running. | 
| SCMAdminProtocolService | This service handles all SCMAdminProtocol rpc calls from administrators
 to the shared cache manager. | 
| SharedCacheManager | This service maintains the shared cache meta data. | 
| SharedCacheUploaderService | This service handles all rpc calls from the NodeManager uploader to the
 shared cache manager. | 
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