com.sun.jdo.spi.persistence.support.sqlstore

Interface VersionConsistencyCache

All Known Implementing Classes:

VersionConsistencyCacheImpl

public interface VersionConsistencyCache

A cache of "version consistent" StateManager instances. These instances are used so that we can avoid loading state from the database.

Author:

Dave Bristor

Method Summary

Modifier and Type	Method and Description
void	addPCType(Class pcType) Informs the cache to expect that the given pcType will be used as a key for the outer map in subsequent putEntry operations.
StateManager	get(Class pcType, Object oid) Returns an SM, if found, else null.
StateManager	put(Class pcType, Object oid, StateManager sm) Puts the given StateManager into a map that is keyed by the given OID.
StateManager	remove(Class pcType, Object oid) Removes entry based on pc and oid.
void	removePCType(Class pcType) Removes the map for the given pcType and all its elements.

Method Detail

put

StateManager put(Class pcType,
                 Object oid,
                 StateManager sm)

Puts the given StateManager into a map that is keyed by the given OID. We anticipate that implementations will want to use a two-level map, and so the pc's class can be used as a key into a map to access a second map, which would be that keyed by OID.

Parameters:

pcType - class of instance, used as key in outer map.

oid - Object id, used as key in inner map.

sm - StateManager bound to oid in inner map.

get

StateManager get(Class pcType,
                 Object oid)

Returns an SM, if found, else null.

Parameters:

pcType - class of instance, used as key in outer map.

oid - Object id, used as key in inner map.

remove

StateManager remove(Class pcType,
                    Object oid)

Removes entry based on pc and oid. If map is empty after remove, removes it from its containint map.

Parameters:

pcType - class of instance, used as key in outer map.

oid - Object id, used as key in inner map.

addPCType

void addPCType(Class pcType)

Informs the cache to expect that the given pcType will be used as a key for the outer map in subsequent putEntry operations.

Parameters:

pcType - class of instance, used as key in outer map.

removePCType

void removePCType(Class pcType)

Removes the map for the given pcType and all its elements.

Parameters:

pcType - class of instance, used as key in outer map.