Package org.eclipse.persistence.descriptors.invalidation

Class CacheInvalidationPolicy

java.lang.Object

org.eclipse.persistence.descriptors.invalidation.CacheInvalidationPolicy

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

DailyCacheInvalidationPolicy, NoExpiryCacheInvalidationPolicy, TimeToLiveCacheInvalidationPolicy

public abstract class CacheInvalidationPolicy
extends java.lang.Object
implements java.io.Serializable, java.lang.Cloneable

PUBLIC: A CacheInvalidationPolicy is used to set objects in TopLink's identity maps to be invalid following given rules. CacheInvalidationPolicy is the abstract superclass for all policies used for cache invalidation. By default in EclipseLink, objects do not expire in the cache. Several different policies are available to allow objects to expire. These can be set on the ClassDescriptor.

See Also:

ClassDescriptor, NoExpiryCacheInvalidationPolicy, DailyCacheInvalidationPolicy, TimeToLiveCacheInvalidationPolicy, Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	isInvalidationRandomized	Allows the timeToLive to be randomized to avoid bottlenecks.
static long	NO_EXPIRY
protected java.util.Random	random	Random used for randomized invalidation.
protected boolean	shouldRefreshInvalidObjectsOnClone	Determines if expired object registered in the unit of work should be refreshed, default true.
protected boolean	shouldUpdateReadTimeOnUpdate	This will represent objects that do not expire.

Constructor Summary

Constructors

Constructor	Description
CacheInvalidationPolicy()

Method Summary

Modifier and Type	Method	Description
java.lang.Object	clone()
abstract long	getExpiryTimeInMillis(org.eclipse.persistence.internal.identitymaps.CacheKey key)	INTERNAL: Get the next time when this object will become invalid
long	getRemainingValidTime(org.eclipse.persistence.internal.identitymaps.CacheKey key)	INTERNAL: Return the remaining life of this object
void	initialize(ClassDescriptor descriptor, org.eclipse.persistence.internal.sessions.AbstractSession session)	INTERNAL: Allow initialization with the descriptor.
boolean	isInvalidated(org.eclipse.persistence.internal.identitymaps.CacheKey key)	INTERNAL: return true if this object is expire, false otherwise.
abstract boolean	isInvalidated(org.eclipse.persistence.internal.identitymaps.CacheKey key, long currentTimeMillis)	INTERNAL: return true if this object is expire, false otherwise.
boolean	isInvalidationRandomized()	PUBLIC: Allows the timeToLive to be randomized to avoid bottlenecks.
void	setIsInvalidationRandomized(boolean isInvalidationRandomized)	PUBLIC: Allows the timeToLive to be randomized to avoid bottlenecks.
void	setShouldRefreshInvalidObjectsInUnitOfWork(boolean shouldRefreshInvalidObjectsInUnitOfWork)	Deprecated. since EclipseLink 2.2
void	setShouldRefreshInvalidObjectsOnClone(boolean shouldRefreshInvalidObjectsOnClone)	PUBLIC: Set if expired object should be refreshed prior to cloning, default is true.
void	setShouldUpdateReadTimeOnUpdate(boolean shouldUpdateReadTime)	PUBLIC: Set whether to update the stored time an object was read when an object is updated.
boolean	shouldRefreshInvalidObjectsInUnitOfWork()	Deprecated. since EclipseLink 2.2
boolean	shouldRefreshInvalidObjectsOnClone()	PUBLIC: Return if expired object should be refreshed prior to cloning.
boolean	shouldUpdateReadTimeOnUpdate()	PUBLIC: Return whether objects affected by this CacheInvalidationPolicy should have the read time on their cache keys updated when an update occurs.

Methods inherited from class java.lang.Object

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

Field Detail

NO_EXPIRY

public static final long NO_EXPIRY

See Also:

Constant Field Values

shouldUpdateReadTimeOnUpdate

protected boolean shouldUpdateReadTimeOnUpdate

This will represent objects that do not expire.

shouldRefreshInvalidObjectsOnClone

protected boolean shouldRefreshInvalidObjectsOnClone

Determines if expired object registered in the unit of work should be refreshed, default true.

isInvalidationRandomized

protected boolean isInvalidationRandomized

Allows the timeToLive to be randomized to avoid bottlenecks.

random

protected java.util.Random random

Random used for randomized invalidation.

Constructor Detail

CacheInvalidationPolicy

public CacheInvalidationPolicy()

Method Detail

isInvalidationRandomized

public boolean isInvalidationRandomized()

PUBLIC: Allows the timeToLive to be randomized to avoid bottlenecks.

setIsInvalidationRandomized

public void setIsInvalidationRandomized(boolean isInvalidationRandomized)

PUBLIC: Allows the timeToLive to be randomized to avoid bottlenecks.

getExpiryTimeInMillis

public abstract long getExpiryTimeInMillis(org.eclipse.persistence.internal.identitymaps.CacheKey key)

INTERNAL: Get the next time when this object will become invalid

getRemainingValidTime

public long getRemainingValidTime(org.eclipse.persistence.internal.identitymaps.CacheKey key)

INTERNAL: Return the remaining life of this object

initialize

public void initialize(ClassDescriptor descriptor,
                       org.eclipse.persistence.internal.sessions.AbstractSession session)

INTERNAL: Allow initialization with the descriptor.

isInvalidated

public boolean isInvalidated(org.eclipse.persistence.internal.identitymaps.CacheKey key)

INTERNAL: return true if this object is expire, false otherwise.

isInvalidated

public abstract boolean isInvalidated(org.eclipse.persistence.internal.identitymaps.CacheKey key,
                                      long currentTimeMillis)

INTERNAL: return true if this object is expire, false otherwise.

setShouldUpdateReadTimeOnUpdate

public void setShouldUpdateReadTimeOnUpdate(boolean shouldUpdateReadTime)

PUBLIC: Set whether to update the stored time an object was read when an object is updated. When the read time is updated, it indicates to EclipseLink that the data in the object is up to date. This means that cache invalidation checks will occur relative to the new read time. By default, the read time will not be updated when an object is updated. Often it is possible to be confident that the object is up to date after an update because otherwise the update will fail because of the locking policies in use.

shouldUpdateReadTimeOnUpdate

public boolean shouldUpdateReadTimeOnUpdate()

PUBLIC: Return whether objects affected by this CacheInvalidationPolicy should have the read time on their cache keys updated when an update occurs.

setShouldRefreshInvalidObjectsInUnitOfWork

@Deprecated
public void setShouldRefreshInvalidObjectsInUnitOfWork(boolean shouldRefreshInvalidObjectsInUnitOfWork)

Deprecated.

since EclipseLink 2.2

PUBLIC: Set if expired object registered in the unit of work should be refreshed, default is true.

See Also:

setShouldRefreshInvalidObjectsOnClone(boolean)

setShouldRefreshInvalidObjectsOnClone

public void setShouldRefreshInvalidObjectsOnClone(boolean shouldRefreshInvalidObjectsOnClone)

PUBLIC: Set if expired object should be refreshed prior to cloning, default is true. Applies to Protected Entities and UnitOfWork registration.

shouldRefreshInvalidObjectsInUnitOfWork

@Deprecated
public boolean shouldRefreshInvalidObjectsInUnitOfWork()

Deprecated.

since EclipseLink 2.2

PUBLIC: Return if expired object registered in the unit of work should be refreshed.

See Also:

shouldRefreshInvalidObjectsOnClone()

shouldRefreshInvalidObjectsOnClone

public boolean shouldRefreshInvalidObjectsOnClone()

PUBLIC: Return if expired object should be refreshed prior to cloning. Applies to Protected Entities and UnitOfWork registration.

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object