| Interface | Description | 
|---|---|
| ClusterSingletonService | 
ClusterSingletonService interface represents a single cluster service instance. | 
| ClusterSingletonServiceProvider | 
ClusterSingletonServiceProvider provides a functionality to register and group services
 ClusterSingletonService by service group identifier. | 
| ClusterSingletonServiceRegistration | 
ClusterSingletonServiceRegistration interface contains a marker for
 holding ClusterSingletonService registration and posibility to close it
 via AutoCloseable interface. | 
| Class | Description | 
|---|---|
| ServiceGroupIdentifier | 
 Identifier represents a service group competence. 
 | 
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