de.schwarzrot.data.access
Class EntityHolder

java.lang.Object
  de.schwarzrot.data.access.EntityHolder

public class EntityHolder
extends Object

another wrapper around HashMap, used to cache entity instances already read from persistence.

Author:

Reinhard Mantey

Constructor Summary

EntityHolder()

Method Summary

void	clear() clear the cache and force all entities to get read again from storage
boolean	contains(Class<? extends Entity> entityType, long id) returns true, if the instance identified by entityType and id is cached, otherwise false
void	dumpStats() tell some statistics about entity cache
Entity	get(Class<? extends Entity> entityType, long id) returns instance identified by entityType and id.
void	put(Entity e) puts an instance to cache
void	remove(Class<? extends Entity> entityType, long id) remove instance from cache
void	remove(Class<? extends Entity> entityType, long[] idList) remove a number of instances from cache, identified by entity type and list of ids
void	removeRelated(Class<?> relatedType, Entity parent, EntityDescriptor ed) remove instances from cache, that are related to given parent

Methods inherited from class java.lang.Object

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

Constructor Detail

EntityHolder

public EntityHolder()

Method Detail

clear

public void clear()

clear the cache and force all entities to get read again from storage

contains

public boolean contains(Class<? extends Entity> entityType,
                        long id)

returns true, if the instance identified by entityType and id is cached, otherwise false

Parameters:

entityType - - the class to search

id - - the id to search

Returns:

- true if the instance is cached, otherwise false

dumpStats

public void dumpStats()

tell some statistics about entity cache

get

public Entity get(Class<? extends Entity> entityType,
                  long id)

returns instance identified by entityType and id.

Parameters:

entityType - - class to search

id - - id to search

Returns:

- the cached instance or null

put

public void put(Entity e)

puts an instance to cache

Parameters:

e - - instance to cache

remove

public void remove(Class<? extends Entity> entityType,
                   long id)

remove instance from cache

Parameters:

entityType - - the class of instance to remove

id - - the id of instance to remove

remove

public void remove(Class<? extends Entity> entityType,
                   long[] idList)

remove a number of instances from cache, identified by entity type and list of ids

Parameters:

entityType - - the class of instances to remove

idList - - the list of ids to remove

removeRelated

public void removeRelated(Class<?> relatedType,
                          Entity parent,
                          EntityDescriptor ed)

remove instances from cache, that are related to given parent

Parameters:

relatedType - - class of instances to remove

parent - - parent the instances to remove are related to

ed - - the entity descriptor