org.apache.mahout.cf.taste.impl.model.jdbc

Class ReloadFromJDBCDataModel

java.lang.Object

org.apache.mahout.cf.taste.impl.model.jdbc.ReloadFromJDBCDataModel

All Implemented Interfaces:

Serializable, Refreshable, DataModel

public final class ReloadFromJDBCDataModel
extends Object
implements DataModel

A DataModel which loads, and can re-load, data from a JDBC-backed JDBCDataModel into memory, as a GenericDataModel or GenericBooleanPrefDataModel. It is intended to provide the speed advantage of in-memory representation but be able to update periodically to pull in new data from a database source.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ReloadFromJDBCDataModel(JDBCDataModel delegate)

Method Summary

Methods

Modifier and Type	Method and Description
JDBCDataModel	getDelegate()
DataModel	getDelegateInMemory()
LongPrimitiveIterator	getItemIDs()
FastIDSet	getItemIDsFromUser(long id)
float	getMaxPreference()
float	getMinPreference()
int	getNumItems()
int	getNumUsers()
int	getNumUsersWithPreferenceFor(long itemID)
int	getNumUsersWithPreferenceFor(long itemID1, long itemID2)
PreferenceArray	getPreferencesForItem(long itemID)
PreferenceArray	getPreferencesFromUser(long id)
Long	getPreferenceTime(long userID, long itemID)
Float	getPreferenceValue(long userID, long itemID)
LongPrimitiveIterator	getUserIDs()
boolean	hasPreferenceValues()
void	refresh(Collection<Refreshable> alreadyRefreshed)
void	removePreference(long userID, long itemID)
void	setPreference(long userID, long itemID, float value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReloadFromJDBCDataModel

public ReloadFromJDBCDataModel(JDBCDataModel delegate)
                        throws TasteException

Throws:

TasteException

Method Detail

refresh

public void refresh(Collection<Refreshable> alreadyRefreshed)

Specified by:

refresh in interface Refreshable

getDelegate

public JDBCDataModel getDelegate()

getDelegateInMemory

public DataModel getDelegateInMemory()

getUserIDs

public LongPrimitiveIterator getUserIDs()
                                 throws TasteException

Specified by:

getUserIDs in interface DataModel

Throws:

TasteException

getPreferencesFromUser

public PreferenceArray getPreferencesFromUser(long id)
                                       throws TasteException

Specified by:

getPreferencesFromUser in interface DataModel

Throws:

TasteException

getItemIDsFromUser

public FastIDSet getItemIDsFromUser(long id)
                             throws TasteException

Specified by:

getItemIDsFromUser in interface DataModel

Throws:

TasteException

getPreferenceValue

public Float getPreferenceValue(long userID,
                       long itemID)
                         throws TasteException

Specified by:

getPreferenceValue in interface DataModel

Throws:

TasteException

getPreferenceTime

public Long getPreferenceTime(long userID,
                     long itemID)
                       throws TasteException

Specified by:

getPreferenceTime in interface DataModel

Throws:

TasteException

getItemIDs

public LongPrimitiveIterator getItemIDs()
                                 throws TasteException

Specified by:

getItemIDs in interface DataModel

Throws:

TasteException

getPreferencesForItem

public PreferenceArray getPreferencesForItem(long itemID)
                                      throws TasteException

Specified by:

getPreferencesForItem in interface DataModel

Throws:

TasteException

getNumItems

public int getNumItems()
                throws TasteException

Specified by:

getNumItems in interface DataModel

Throws:

TasteException

getNumUsers

public int getNumUsers()
                throws TasteException

Specified by:

getNumUsers in interface DataModel

Throws:

TasteException

getNumUsersWithPreferenceFor

public int getNumUsersWithPreferenceFor(long itemID)
                                 throws TasteException

Specified by:

getNumUsersWithPreferenceFor in interface DataModel

Throws:

TasteException

getNumUsersWithPreferenceFor

public int getNumUsersWithPreferenceFor(long itemID1,
                               long itemID2)
                                 throws TasteException

Specified by:

getNumUsersWithPreferenceFor in interface DataModel

Throws:

TasteException

setPreference

public void setPreference(long userID,
                 long itemID,
                 float value)
                   throws TasteException

Specified by:

setPreference in interface DataModel

Throws:

TasteException

removePreference

public void removePreference(long userID,
                    long itemID)
                      throws TasteException

Specified by:

removePreference in interface DataModel

Throws:

TasteException

hasPreferenceValues

public boolean hasPreferenceValues()

Specified by:

hasPreferenceValues in interface DataModel

getMaxPreference

public float getMaxPreference()

Specified by:

getMaxPreference in interface DataModel

getMinPreference

public float getMinPreference()

Specified by:

getMinPreference in interface DataModel