org.grouplens.lenskit.data.dao

Interface UserEventDAO

All Known Implementing Classes:

BinaryRatingDAO, JDBCRatingDAO, PrefetchingUserEventDAO, RatingSnapshotDAO

@DefaultImplementation(value=PrefetchingUserEventDAO.class)
public interface UserEventDAO

DAO to retrieve events by user.

Since:

1.3

Method Summary

Modifier and Type	Method and Description
UserHistory<Event>	getEventsForUser(long user) Get the events for a specific user.
<E extends Event> UserHistory<E>	getEventsForUser(long user, Class<E> type) Get the events for a specific user, filtering by type.
Cursor<UserHistory<Event>>	streamEventsByUser() Stream events grouped by user.
<E extends Event> Cursor<UserHistory<E>>	streamEventsByUser(Class<E> type) Stream events grouped by user.

Method Detail

streamEventsByUser

Cursor<UserHistory<Event>> streamEventsByUser()

Stream events grouped by user.

Returns:

A cursor of user histories. If a user exists, but does not have any history, they may or may not be included depending on the DAO implementation.

streamEventsByUser

<E extends Event> Cursor<UserHistory<E>> streamEventsByUser(Class<E> type)

Stream events grouped by user.

Parameters:

type - The type of item to look for.

Returns:

A cursor of user histories, filtered to contain events of type type. If a user exists, but does not have any history, they may or may not be included depending on the DAO implementation.

getEventsForUser

@Nullable
UserHistory<Event> getEventsForUser(long user)

Get the events for a specific user.

Parameters:

user - The user ID.

Returns:

The user's history, or null if the user is unknown.

getEventsForUser

@Nullable
<E extends Event> UserHistory<E> getEventsForUser(long user,
                                                            Class<E> type)

Get the events for a specific user, filtering by type.

Parameters:

user - The user ID.

type - The type of events to retrieve.

Returns:

The user's history, or null if the user is unknown.