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

Class SQL92JDBCInMemoryItemSimilarity

java.lang.Object

org.apache.mahout.cf.taste.impl.common.jdbc.AbstractJDBCComponent

org.apache.mahout.cf.taste.impl.similarity.jdbc.SQL92JDBCInMemoryItemSimilarity

All Implemented Interfaces:

Refreshable, ItemSimilarity

Direct Known Subclasses:

MySQLJDBCInMemoryItemSimilarity

public class SQL92JDBCInMemoryItemSimilarity
extends AbstractJDBCComponent

Field Summary

Fields inherited from class org.apache.mahout.cf.taste.impl.common.jdbc.AbstractJDBCComponent

DEFAULT_DATASOURCE_NAME

Constructor Summary

Constructors

Constructor and Description
SQL92JDBCInMemoryItemSimilarity()
SQL92JDBCInMemoryItemSimilarity(DataSource dataSource)
SQL92JDBCInMemoryItemSimilarity(DataSource dataSource, String getAllItemSimilaritiesSQL)
SQL92JDBCInMemoryItemSimilarity(String dataSourceName)

Method Summary

Methods

Modifier and Type	Method and Description
long[]	allSimilarItemIDs(long itemID)
double[]	itemSimilarities(long itemID1, long[] itemID2s)
double	itemSimilarity(long itemID1, long itemID2)
void	refresh(Collection<Refreshable> alreadyRefreshed)
protected void	reload()

Methods inherited from class org.apache.mahout.cf.taste.impl.common.jdbc.AbstractJDBCComponent

checkNotNullAndLog, checkNotNullAndLog, getFetchSize, lookupDataSource

Methods inherited from class java.lang.Object

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

Constructor Detail

SQL92JDBCInMemoryItemSimilarity

public SQL92JDBCInMemoryItemSimilarity()
                                throws TasteException

Throws:

TasteException

SQL92JDBCInMemoryItemSimilarity

public SQL92JDBCInMemoryItemSimilarity(String dataSourceName)
                                throws TasteException

Throws:

TasteException

SQL92JDBCInMemoryItemSimilarity

public SQL92JDBCInMemoryItemSimilarity(DataSource dataSource)

SQL92JDBCInMemoryItemSimilarity

public SQL92JDBCInMemoryItemSimilarity(DataSource dataSource,
                               String getAllItemSimilaritiesSQL)

Method Detail

itemSimilarity

public double itemSimilarity(long itemID1,
                    long itemID2)
                      throws TasteException

Specified by:

itemSimilarity in interface ItemSimilarity

Throws:

TasteException

itemSimilarities

public double[] itemSimilarities(long itemID1,
                        long[] itemID2s)
                          throws TasteException

Specified by:

itemSimilarities in interface ItemSimilarity

Throws:

TasteException

allSimilarItemIDs

public long[] allSimilarItemIDs(long itemID)
                         throws TasteException

Specified by:

allSimilarItemIDs in interface ItemSimilarity

Throws:

TasteException

refresh

public void refresh(Collection<Refreshable> alreadyRefreshed)

Specified by:

refresh in interface Refreshable

reload

protected void reload()