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

Class MySQLJDBCInMemoryItemSimilarity

java.lang.Object

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

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

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

All Implemented Interfaces:

Refreshable, ItemSimilarity

public class MySQLJDBCInMemoryItemSimilarity
extends SQL92JDBCInMemoryItemSimilarity

Field Summary

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

DEFAULT_DATASOURCE_NAME

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
long[]	allSimilarItemIDs(long itemID)
protected int	getFetchSize()
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, lookupDataSource

Methods inherited from class java.lang.Object

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

Constructor Detail

MySQLJDBCInMemoryItemSimilarity

public MySQLJDBCInMemoryItemSimilarity()
                                throws TasteException

Throws:

TasteException

MySQLJDBCInMemoryItemSimilarity

public MySQLJDBCInMemoryItemSimilarity(String dataSourceName)
                                throws TasteException

Throws:

TasteException

MySQLJDBCInMemoryItemSimilarity

public MySQLJDBCInMemoryItemSimilarity(DataSource dataSource)

MySQLJDBCInMemoryItemSimilarity

public MySQLJDBCInMemoryItemSimilarity(DataSource dataSource,
                               String getAllItemSimilaritiesSQL)

Method Detail

getFetchSize

protected int getFetchSize()

Overrides:

getFetchSize in class AbstractJDBCComponent

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()