| Interface | Description | 
|---|---|
| ExpiryPolicy | Defines functions to determine when cache entries will expire based on
 creation, access and modification operations. | 
| Class | Description | 
|---|---|
| AccessedExpiryPolicy | An  ExpiryPolicythat defines the expiryDurationof a Cache Entry based on the last time it was accessed. | 
| CreatedExpiryPolicy | An  ExpiryPolicythat defines the expiryDurationof a Cache Entry based on when it was created. | 
| Duration | A  Serializableduration of time. | 
| EternalExpiryPolicy | An eternal  ExpiryPolicyspecifies that Cache Entries
 won't expire. | 
| ModifiedExpiryPolicy | An  ExpiryPolicythat defines the expiryDurationof a Cache Entry based on the last time it was updated. | 
| TouchedExpiryPolicy | An  ExpiryPolicythat defines the expiryDurationof a Cache Entry based on when it was last touched. | 
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