org.apache.mahout.cf.taste.model

Interface UpdatableIDMigrator

All Superinterfaces:

IDMigrator, Refreshable

All Known Implementing Classes:

AbstractJDBCIDMigrator, MemoryIDMigrator, MySQLJDBCIDMigrator

public interface UpdatableIDMigrator
extends IDMigrator

Method Summary

Modifier and Type	Method and Description
void	initialize(Iterable<String> stringIDs) Make the mapping aware of the given string IDs.
void	storeMapping(long longID, String stringID) Stores the reverse long-to-String mapping in some kind of backing store.

Methods inherited from interface org.apache.mahout.cf.taste.model.IDMigrator

toLongID, toStringID

Methods inherited from interface org.apache.mahout.cf.taste.common.Refreshable

refresh

Method Detail

storeMapping

void storeMapping(long longID,
                  String stringID)
           throws TasteException

Stores the reverse long-to-String mapping in some kind of backing store. Note that this must be called directly (or indirectly through initialize(Iterable)) for every String that might be encountered in the application, or else the mapping will not be known.

Parameters:

longID - long ID

stringID - string ID that maps to/from that long ID

Throws:

TasteException - if an error occurs while saving the mapping

initialize

void initialize(Iterable<String> stringIDs)
         throws TasteException

Make the mapping aware of the given string IDs. This must be called initially before the implementation is used, or else it will not be aware of reverse long-to-String mappings.

Throws:

TasteException - if an error occurs while storing the mappings