Package org.eclipse.persistence.internal.identitymaps

Class NoIdentityMap

java.lang.Object

org.eclipse.persistence.internal.identitymaps.AbstractIdentityMap

org.eclipse.persistence.internal.identitymaps.NoIdentityMap

All Implemented Interfaces:

Serializable, Cloneable, IdentityMap

public class NoIdentityMap
extends AbstractIdentityMap

Purpose: Provide the capability to not cache objects at all.

Responsibilities:

• Do nothing when an object is cached.

Since:

TOPLink/Java 1.0

See Also:

Serialized Form

Field Summary

Fields inherited from class org.eclipse.persistence.internal.identitymaps.AbstractIdentityMap

descriptor, isIsolated, maxSize, session

Constructor Summary

Constructors

Constructor	Description
NoIdentityMap(int size, ClassDescriptor descriptor, AbstractSession session, boolean isolated)

Method Summary

Modifier and Type	Method	Description
Enumeration<CacheKey>	cloneKeys()	Return an empty enumerator.
void	collectLocks(HashMap threadList)	NoIdentityMap has no locks.
Enumeration	elements()	Return an empty enumerator.
Object	get(Object primaryKey)	Return null as no objects are cached.
CacheKey	getCacheKey(Object searchKey, boolean forMerge)	Return null as no objects are cached.
int	getSize()	Return 0 as no objects are cached.
int	getSize(Class myClass, boolean recurse)	Return 0 as no objects are cached.
Object	getWriteLockValue(Object primaryKey)	Return null as no objects are cached.
Enumeration<CacheKey>	keys()	Return an empty enumerator.
Enumeration<CacheKey>	keys(boolean checkReadLocks)	Return an empty enumerator.
void	lazyRelationshipLoaded(Object object, ValueHolderInterface valueHolder, ForeignReferenceMapping mapping)	Notify the cache that a lazy relationship has been triggered in the object and the cache may need to be updated
CacheKey	put(Object primaryKey, Object object, Object writeLockValue, long readTime)	Do Nothing.
protected CacheKey	putCacheKeyIfAbsent(CacheKey cacheKey)	Return null as no objects are cached.
Object	remove(Object primaryKey, Object object)	Do Nothing.
Object	remove(CacheKey searchKey)	Do Nothing.
void	setWriteLockValue(Object primaryKey, Object writeLockValue)	Do Nothing.

Methods inherited from class org.eclipse.persistence.internal.identitymaps.AbstractIdentityMap

acquireDeferredLock, acquireLock, acquireLockNoWait, acquireLockWithWait, acquireReadLockOnCacheKey, acquireReadLockOnCacheKeyNoWait, clone, containsKey, createCacheKey, getAllCacheKeysFromIdentityMapWithEntityPK, getAllFromIdentityMapWithEntityPK, getCacheKeyForLock, getCacheKeyWithReadLock, getDefaultIdentityMapClass, getDescriptor, getDescriptorClass, getMaxSize, getWrapper, release, setDescriptor, setMaxSize, setWrapper, toString, updateMaxSize

Methods inherited from class java.lang.Object

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

Constructor Detail

NoIdentityMap

public NoIdentityMap(int size,
                     ClassDescriptor descriptor,
                     AbstractSession session,
                     boolean isolated)

Method Detail

collectLocks

public void collectLocks(HashMap threadList)

NoIdentityMap has no locks.

Specified by:

collectLocks in interface IdentityMap

Specified by:

collectLocks in class AbstractIdentityMap

elements

public Enumeration elements()

Return an empty enumerator.

Specified by:

elements in interface IdentityMap

Specified by:

elements in class AbstractIdentityMap

get

public Object get(Object primaryKey)

Return null as no objects are cached.

Specified by:

get in interface IdentityMap

Overrides:

get in class AbstractIdentityMap

getCacheKey

public CacheKey getCacheKey(Object searchKey,
                            boolean forMerge)

Return null as no objects are cached.

Specified by:

getCacheKey in interface IdentityMap

Specified by:

getCacheKey in class AbstractIdentityMap

putCacheKeyIfAbsent

protected CacheKey putCacheKeyIfAbsent(CacheKey cacheKey)

Return null as no objects are cached.

Specified by:

putCacheKeyIfAbsent in class AbstractIdentityMap

getSize

public int getSize()

Return 0 as no objects are cached.

Specified by:

getSize in interface IdentityMap

Specified by:

getSize in class AbstractIdentityMap

getSize

public int getSize(Class myClass,
                   boolean recurse)

Return 0 as no objects are cached.

Specified by:

getSize in interface IdentityMap

Specified by:

getSize in class AbstractIdentityMap

getWriteLockValue

public Object getWriteLockValue(Object primaryKey)

Return null as no objects are cached.

Specified by:

getWriteLockValue in interface IdentityMap

Overrides:

getWriteLockValue in class AbstractIdentityMap

keys

public Enumeration<CacheKey> keys()

Return an empty enumerator.

Specified by:

keys in interface IdentityMap

Specified by:

keys in class AbstractIdentityMap

cloneKeys

public Enumeration<CacheKey> cloneKeys()

Return an empty enumerator.

Returns:

clone of the CacheKeys enumeration

keys

public Enumeration<CacheKey> keys(boolean checkReadLocks)

Return an empty enumerator.

Parameters:

checkReadLocks - - true if readLocks should be checked, false otherwise.

lazyRelationshipLoaded

public void lazyRelationshipLoaded(Object object,
                                   ValueHolderInterface valueHolder,
                                   ForeignReferenceMapping mapping)

Notify the cache that a lazy relationship has been triggered in the object and the cache may need to be updated

put

public CacheKey put(Object primaryKey,
                    Object object,
                    Object writeLockValue,
                    long readTime)

Do Nothing.

Specified by:

put in interface IdentityMap

Specified by:

put in class AbstractIdentityMap

Parameters:

primaryKey - is the primary key for the object.

object - is the domain object to cache.

writeLockValue - is the current write lock value of object, if null the version is ignored.

remove

public Object remove(Object primaryKey,
                     Object object)

Do Nothing. Return null, since no objects are cached.

Specified by:

remove in interface IdentityMap

Overrides:

remove in class AbstractIdentityMap

remove

public Object remove(CacheKey searchKey)

Do Nothing. Return null, since no objects are cached.

Specified by:

remove in interface IdentityMap

Specified by:

remove in class AbstractIdentityMap

setWriteLockValue

public void setWriteLockValue(Object primaryKey,
                              Object writeLockValue)

Do Nothing.

Specified by:

setWriteLockValue in interface IdentityMap

Overrides:

setWriteLockValue in class AbstractIdentityMap