Module org.eclipse.persistence.core

Package org.eclipse.persistence.internal.identitymaps

Class FullIdentityMap

java.lang.Object

org.eclipse.persistence.internal.identitymaps.AbstractIdentityMap

org.eclipse.persistence.internal.identitymaps.FullIdentityMap

All Implemented Interfaces:

Serializable, Cloneable, IdentityMap

Direct Known Subclasses:

CacheIdentityMap, UnitOfWorkIdentityMap, WeakIdentityMap

public class FullIdentityMap
extends AbstractIdentityMap

Purpose: A FullIdentityMap holds all objects stored within it for the life of the application.

Responsibilities:

• Guarantees identity
• Holds all cached objects indefinitely.

Since:

TOPLink/Java 1.0

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<Object,CacheKey>	cacheKeys	Map of CacheKeys stored using their key.

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

descriptor, isIsolated, maxSize, session

Constructor Summary

Constructors

Constructor	Description
FullIdentityMap()	Used to allow subclasses to build different map type.
FullIdentityMap(int size, ClassDescriptor descriptor, AbstractSession session, boolean isolated)

Method Summary

Modifier and Type	Method	Description
Object	clone()	INTERNAL: Clones itself.
Enumeration<CacheKey>	cloneKeys()	Allow for the CacheKey elements to be iterated.
void	collectLocks(HashMap threadList)	INTERNAL: Used to print all the Locks in every identity map in this session.
Enumeration	elements()	Allow for the cache CacheKey.getObject() elements to be iterated.
CacheKey	getCacheKey(Object searchKey, boolean forMerge)	Return the cache key matching the primary key of the searchKey.
Map<Object,CacheKey>	getCacheKeys()	Return the cache keys.
int	getSize()	Return the number of CacheKeys in the IdentityMap.
int	getSize(Class<?> myClass, boolean recurse)	Return the number of actual objects of type myClass in the IdentityMap.
Enumeration<CacheKey>	keys()	Allow for the cache keys to be iterated on.
Enumeration<CacheKey>	keys(boolean checkReadLocks)	Allow for the CacheKey elements to be iterated.
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)	Store the object in the cache at its primary key.
protected CacheKey	putCacheKeyIfAbsent(CacheKey searchKey)	Return the CacheKey (with object) matching the searchKey.
Object	remove(CacheKey cacheKey)	Removes the CacheKey from the map.
void	resetCacheKey(CacheKey key, Object object, Object writeLockValue, long readTime)	Reset the cache key with new data.
protected void	setCacheKeys(Map<Object,CacheKey> cacheKeys)

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

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

Methods inherited from class java.lang.Object

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

Field Details

cacheKeys

protected Map<Object,CacheKey> cacheKeys

Map of CacheKeys stored using their key.

Constructor Details

FullIdentityMap

public FullIdentityMap()

Used to allow subclasses to build different map type.

FullIdentityMap

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

Method Details

clone

public Object clone()

INTERNAL: Clones itself.

Specified by:

clone in interface IdentityMap

Overrides:

clone in class AbstractIdentityMap

collectLocks

public void collectLocks(HashMap threadList)

INTERNAL: Used to print all the Locks in every identity map in this session.

Specified by:

collectLocks in interface IdentityMap

Specified by:

collectLocks in class AbstractIdentityMap

elements

public Enumeration elements()

Allow for the cache CacheKey.getObject() elements to be iterated.

Specified by:

elements in interface IdentityMap

Specified by:

elements in class AbstractIdentityMap

Returns:

Enumeration of CacheKey.getObject() instances.

getCacheKey

public CacheKey getCacheKey(Object searchKey,
 boolean forMerge)

Return the cache key matching the primary key of the searchKey. If no object for the key exists, return null.

Specified by:

getCacheKey in interface IdentityMap

Specified by:

getCacheKey in class AbstractIdentityMap

putCacheKeyIfAbsent

protected CacheKey putCacheKeyIfAbsent(CacheKey searchKey)

Return the CacheKey (with object) matching the searchKey. If the CacheKey is missing then put the searchKey in the map. The searchKey should have already been locked.

Specified by:

putCacheKeyIfAbsent in class AbstractIdentityMap

getCacheKeys

public Map<Object,CacheKey> getCacheKeys()

Return the cache keys.

getSize

public int getSize()

Return the number of CacheKeys in the IdentityMap. This may contain weak referenced objects that have been garbage collected.

Specified by:

getSize in interface IdentityMap

Specified by:

getSize in class AbstractIdentityMap

getSize

public int getSize(Class<?> myClass,
 boolean recurse)

Return the number of actual objects of type myClass in the IdentityMap. Recurse = true will include subclasses of myClass in the count.

Specified by:

getSize in interface IdentityMap

Specified by:

getSize in class AbstractIdentityMap

keys

public Enumeration<CacheKey> keys()

Allow for the cache keys to be iterated on. Read locks will be checked.

Specified by:

keys in interface IdentityMap

Specified by:

keys in class AbstractIdentityMap

keys

public Enumeration<CacheKey> keys(boolean checkReadLocks)

Allow for the CacheKey elements to be iterated. CacheKey Collection is reused so this iteration may not be thread safe.

Parameters:

checkReadLocks - value of true if read lock on the CacheKey instances should be checked or false otherwise

Returns:

Enumeration of CacheKey instances.

cloneKeys

public Enumeration<CacheKey> cloneKeys()

Allow for the CacheKey elements to be iterated. Clone of CacheKey Collection is returned so this iteration should be thread safe.

Returns:

Enumeration with clone of the CacheKey Collection

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)

Store the object in the cache at its primary key. This is used by InsertObjectQuery, typically into the UnitOfWork identity map. Merge and reads do not use put, but acquireLock. Also an advanced (very) user API.

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(CacheKey cacheKey)

Removes the CacheKey from the map.

Specified by:

remove in interface IdentityMap

Specified by:

remove in class AbstractIdentityMap

Returns:

the object held within the CacheKey or null if no object cached for given cacheKey.

resetCacheKey

public void resetCacheKey(CacheKey key,
 Object object,
 Object writeLockValue,
 long readTime)

Reset the cache key with new data.

setCacheKeys

protected void setCacheKeys(Map<Object,CacheKey> cacheKeys)