com.amazon.ask.attributes.persistence

Interface PersistenceAdapter

public interface PersistenceAdapter

Persistence adapters allow an AttributesManager to store skill attributes to a persistence layer. The adapter encapsulates all initialization, get, and save logic specific to the persistence implementation.

Method Summary

Modifier and Type	Method and Description
Optional<Map<String,Object>>	getAttributes(com.amazon.ask.model.RequestEnvelope envelope) Retrieves attributes from persistence.
void	saveAttributes(com.amazon.ask.model.RequestEnvelope envelope, Map<String,Object> attributes) Saves attributes to persistence.

Method Detail

getAttributes

Optional<Map<String,Object>> getAttributes(com.amazon.ask.model.RequestEnvelope envelope)
                                    throws PersistenceException

Retrieves attributes from persistence. A RequestEnvelope is passed to the adapter so current request parameters can be used as an attribute key.

Parameters:

envelope - the current request envelope

Returns:

Optional containing existing attributes if they exist, or empty if not

Throws:

PersistenceException - if attributes could not be retrieved due to an error

saveAttributes

void saveAttributes(com.amazon.ask.model.RequestEnvelope envelope,
                    Map<String,Object> attributes)
             throws PersistenceException

Saves attributes to persistence. A RequestEnvelope is passed to the adapter so current request parameters can be used as an attribute key.

Parameters:

envelope - the current request envelope

attributes - attributes to persist

Throws:

PersistenceException - if attributes could not be saved due to an error