| Interface | Description | 
|---|---|
| TokenStore | 
 Describes a component capable of storing and retrieving event tracking tokens. 
 | 
| Class | Description | 
|---|---|
| AbstractTokenEntry<T> | 
 Abstract base class of a JPA entry containing a serialized tracking token belonging to a given process. 
 | 
| ConfigToken | 
 A special implementation of a Token that is used to store configuration specific to the underlying
 storage of each TokenStore instance. 
 | 
| GenericTokenEntry<T> | 
 Generic implementation of a token entry. 
 | 
| Exception | Description | 
|---|---|
| UnableToClaimTokenException | 
 Exception indicating that a processor tried to claim a Token (either by retrieving or updating it) that has already
 been claimed by another process. 
 | 
| UnableToInitializeTokenException | 
 Exception indicating that the TokenStore was unable to initialize a Token for a tracking processor and Segment. 
 | 
| UnableToRetrieveIdentifierException | 
 Exception indicating that a TokenStore implementation was unable determine its identifier based on the underlying
 storage. 
 | 
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