org.eclipse.persistence.internal.identitymaps

Class WeakIdentityMap

java.lang.Object

org.eclipse.persistence.internal.identitymaps.AbstractIdentityMap

org.eclipse.persistence.internal.identitymaps.FullIdentityMap

org.eclipse.persistence.internal.identitymaps.WeakIdentityMap

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, IdentityMap

Direct Known Subclasses:

HardCacheWeakIdentityMap, SoftIdentityMap

public class WeakIdentityMap
extends FullIdentityMap

Purpose: A WeakIdentityMap holds all objects referenced by the application only. The weak identity map is similar to the full identity map except for the fact that it allows full garbage collection.

Responsibilities:

• Guarantees identity.
• Allows garbage collection.

Since:

TOPLink/Java 1.0

See Also:

Serialized Form

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
CacheKey	createCacheKey(java.lang.Object primaryKey, java.lang.Object object, java.lang.Object writeLockValue, long readTime) Create the correct type of CacheKey for this map.

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

clone, collectLocks, elements, getCacheKey, getCacheKeys, getSize, getSize, keys, keys, lazyRelationshipLoaded, put, remove, resetCacheKey

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakIdentityMap

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

Method Detail

createCacheKey

public CacheKey createCacheKey(java.lang.Object primaryKey,
                               java.lang.Object object,
                               java.lang.Object writeLockValue,
                               long readTime)

Description copied from class: AbstractIdentityMap

Create the correct type of CacheKey for this map.

Overrides:

createCacheKey in class AbstractIdentityMap