java.lang.Object
- org.eclipse.persistence.descriptors.invalidation.CacheInvalidationPolicy

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

DailyCacheInvalidationPolicy, NoExpiryCacheInvalidationPolicy, TimeToLiveCacheInvalidationPolicy
```
public abstract class CacheInvalidationPolicy
extends Object
implements Serializable, 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 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

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`clone()`
`abstract long`	`getExpiryTimeInMillis(CacheKey key)`	INTERNAL: Get the next time when this object will become invalid
`long`	`getRemainingValidTime(CacheKey key)`	INTERNAL: Return the remaining life of this object
`void`	`initialize(ClassDescriptor descriptor, AbstractSession session)`	INTERNAL: Allow initialization with the descriptor.
`boolean`	`isInvalidated(CacheKey key)`	INTERNAL: return true if this object is expire, false otherwise.
`abstract boolean`	`isInvalidated(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`	`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`	`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 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(CacheKey key)
```
    INTERNAL: Get the next time when this object will become invalid
  - getRemainingValidTime
```
public long getRemainingValidTime(CacheKey key)
```
    INTERNAL: Return the remaining life of this object
  - initialize
```
public void initialize(ClassDescriptor descriptor,
                       AbstractSession session)
```
    INTERNAL: Allow initialization with the descriptor.
  - isInvalidated
```
public boolean isInvalidated(CacheKey key)
```
    INTERNAL: return true if this object is expire, false otherwise.
  - isInvalidated
```
public abstract boolean isInvalidated(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.
  - 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.
  - shouldRefreshInvalidObjectsOnClone
```
public boolean shouldRefreshInvalidObjectsOnClone()
```
    PUBLIC: Return if expired object should be refreshed prior to cloning. Applies to Protected Entities and UnitOfWork registration.
  - clone
```
public Object clone()
```
    Overrides:
    
    clone in class Object

Class CacheInvalidationPolicy

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NO_EXPIRY

shouldUpdateReadTimeOnUpdate

shouldRefreshInvalidObjectsOnClone

isInvalidationRandomized

random

Constructor Detail

CacheInvalidationPolicy

Method Detail

isInvalidationRandomized

setIsInvalidationRandomized

getExpiryTimeInMillis

getRemainingValidTime

initialize

isInvalidated

isInvalidated

setShouldUpdateReadTimeOnUpdate

shouldUpdateReadTimeOnUpdate

setShouldRefreshInvalidObjectsOnClone

shouldRefreshInvalidObjectsOnClone

clone