de.ipcon.db.core

Class CachingBOLoaderLRUStrategy

java.lang.Object

de.ipcon.db.core.CachingBOLoaderLRUStrategy

All Implemented Interfaces:

CachingBOLoaderUpdateStrategyI

public class CachingBOLoaderLRUStrategy
extends java.lang.Object
implements CachingBOLoaderUpdateStrategyI

This class implements a class limited LRU update strategy with matching gcStrategy. It allows to register a set of classes including class specific limits to keep inside of the cache. Those limits are honored using a relatively simple LRU strategy.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CachingBOLoaderLRUStrategy.ClassLimitedLRUContainer

Constructor Summary

Constructors

Constructor and Description
CachingBOLoaderLRUStrategy(CachingBOLoader _boLoader, java.lang.Class[] _keepClasses, int[] _maxKeeps, int _interval)

Method Summary

Modifier and Type	Method and Description
java.util.Set<EntityI>	getMonitoredEntities() Returns the entity types to register with the database change listener.
boolean	isEagerLoadingEnabled() Determines whether newly created server objects matching the monitored entities should be eagerly loaded into the cache even if not previously cached.
boolean	isMonitoredClass(java.lang.Class<? extends BOI> clazz) Evaluates whether a specific BO class requires cache synchronization.
CachingBOLoaderRegistration	registerKeepClass(java.lang.Class c, int maxKeep)
CachingBOLoaderRegistration	registerKeepClasses(java.lang.Class[] cs, int maxKeep)
void	unregisterKeepClass(CachingBOLoaderRegistration r)
void	unregisterKeepClasses(CachingBOLoaderRegistration[] rr)
void	unregisterKeepClassesProtected(CachingBOLoaderRegistration[] rr)

Methods inherited from class java.lang.Object

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

Constructor Detail

CachingBOLoaderLRUStrategy

public CachingBOLoaderLRUStrategy(CachingBOLoader _boLoader,
                                  java.lang.Class[] _keepClasses,
                                  int[] _maxKeeps,
                                  int _interval)

Method Detail

getMonitoredEntities

public java.util.Set<EntityI> getMonitoredEntities()

Description copied from interface: CachingBOLoaderUpdateStrategyI

Returns the entity types to register with the database change listener.

Only changes to business objects belonging to these entities trigger update evaluation.

Specified by:

getMonitoredEntities in interface CachingBOLoaderUpdateStrategyI

Returns:

unmodifiable set of entities monitored for updates; never null

isMonitoredClass

public boolean isMonitoredClass(java.lang.Class<? extends BOI> clazz)

Description copied from interface: CachingBOLoaderUpdateStrategyI

Evaluates whether a specific BO class requires cache synchronization.

Acts as a concrete type filter for polymorphic entities returned by CachingBOLoaderUpdateStrategyI.getMonitoredEntities(). Called only for classes whose entity definition is included in CachingBOLoaderUpdateStrategyI.getMonitoredEntities().

Specified by:

isMonitoredClass in interface CachingBOLoaderUpdateStrategyI

Parameters:

clazz - concrete BO class to evaluate; non-null

Returns:

true if instances of this class (or subclass) are tracked; false otherwise

isEagerLoadingEnabled

public boolean isEagerLoadingEnabled()

Determines whether newly created server objects matching the monitored entities should be eagerly loaded into the cache even if not previously cached.

If false, updates are applied strictly to objects already resident in the cache or linked via currently unlazied many-relations.

Returns false; this strategy restricts cache synchronization exclusively to already-cached objects, because adding changed BOs will mess with our LRU strategy the moment they're frapped.

Specified by:

isEagerLoadingEnabled in interface CachingBOLoaderUpdateStrategyI

Returns:

false

registerKeepClass

public CachingBOLoaderRegistration registerKeepClass(java.lang.Class c,
                                                     int maxKeep)

registerKeepClasses

public CachingBOLoaderRegistration registerKeepClasses(java.lang.Class[] cs,
                                                       int maxKeep)

unregisterKeepClass

public void unregisterKeepClass(CachingBOLoaderRegistration r)

unregisterKeepClasses

public void unregisterKeepClasses(CachingBOLoaderRegistration[] rr)

unregisterKeepClassesProtected

public void unregisterKeepClassesProtected(CachingBOLoaderRegistration[] rr)