org.hibernate.engine

Class StatefulPersistenceContext

Implemented Interfaces:
PersistenceContext

public class StatefulPersistenceContext
extends java.lang.Object
implements PersistenceContext

A PersistenceContext represents the state of persistent "stuff" which Hibernate is tracking. This includes persistent entities, collections, as well as proxies generated. There is meant to be a one-to-one correspondence between a SessionImpl and a PersistentContext. The SessionImpl uses the PersistentContext to track the current state of its context. Event-listeners then use the PersistentContext to drive their processing.
Author:
Steve Ebersole

Field Summary

static Object
NO_ROW

Constructor Summary

StatefulPersistenceContext(SessionImplementor session)
Constructs a PersistentContext, bound to the given session.

Method Summary

void
addCollectionHolder(PersistentCollection holder)
Register a PersistentCollection object for an array.
EntityEntry
addEntity(Object entity, Status status, Object[] loadedState, EntityKey entityKey, Object version, LockMode lockMode, boolean existsInDatabase, EntityPersister persister, boolean disableVersionIncrement, boolean lazyPropertiesAreUnfetched)
Adds an entity to the internal caches.
void
addEntity(EntityKey key, Object entity)
void
addEntity(EntityUniqueKey euk, Object entity)
Add an entity to the cache by unique key
EntityEntry
addEntry(Object entity, Status status, Object[] loadedState, Object rowId, Serializable id, Object version, LockMode lockMode, boolean existsInDatabase, EntityPersister persister, boolean disableVersionIncrement, boolean lazyPropertiesAreUnfetched)
Generates an appropriate EntityEntry instance and adds it to the event source's internal caches.
CollectionEntry
addInitializedCollection(CollectionPersister persister, PersistentCollection collection, Serializable id)
add a collection we just pulled out of the cache (does not need initializing)
void
addInitializedDetachedCollection(CollectionPersister collectionPersister, PersistentCollection collection)
add an (initialized) collection that was created by another session and passed into update() (ie.
void
addNewCollection(CollectionPersister persister, PersistentCollection collection)
Add a new collection (ie.
void
addNonLazyCollection(PersistentCollection collection)
Register a collection for non-lazy loading at the end of the two-phase load
void
addNullProperty(EntityKey ownerKey, String propertyName)
Record the fact that the association belonging to the keyed entity is null.
void
addProxy(EntityKey key, Object proxy)
Add a proxy to the session cache
void
addUninitializedCollection(CollectionPersister persister, PersistentCollection collection, Serializable id)
add a collection we just loaded up (still needs initializing)
void
addUninitializedDetachedCollection(CollectionPersister persister, PersistentCollection collection)
add a detached uninitialized collection
void
addUnownedCollection(CollectionKey key, PersistentCollection collection)
void
afterLoad()
Call this after finishing a two-phase load
void
afterTransactionCompletion()
void
beforeLoad()
Call this before begining a two-phase load
void
checkUniqueness(EntityKey key, Object object)
Attempts to check whether the given key represents an entity already loaded within the current session.
void
clear()
boolean
containsCollection(PersistentCollection collection)
boolean
containsEntity(EntityKey key)
boolean
containsProxy(Object entity)
int
decrementCascadeLevel()
static StatefulPersistenceContext
deserialize(ObjectInputStream ois, SessionImplementor session)
BatchFetchQueue
getBatchFetchQueue()
Get the BatchFetchQueue, instantiating one if necessary.
Object[]
getCachedDatabaseSnapshot(EntityKey key)
Retrieve the cached database snapshot for the requested entity key.
int
getCascadeLevel()
Do we already know that the entity does not exist in the database?
PersistentCollection
getCollection(CollectionKey collectionKey)
Get the collection instance associated with the CollectionKey
Map
getCollectionEntries()
CollectionEntry
getCollectionEntry(PersistentCollection coll)
Get the collection entry for a persistent collection
CollectionEntry
getCollectionEntryOrNull(Object collection)
Get the collection entry for a collection passed to filter, which might be a collection wrapper, an array, or an unwrapped collection.
PersistentCollection
getCollectionHolder(Object array)
Get the PersistentCollection object for an array
Object
getCollectionOwner(Serializable key, CollectionPersister collectionPersister)
Get the entity that owns this persistent collection
Map
getCollectionsByKey()
Object[]
getDatabaseSnapshot(Serializable id, EntityPersister persister)
Get the current state of the entity as known to the underlying database, or null if there is no corresponding row
Map
getEntitiesByKey()
Object
getEntity(EntityKey key)
Get the entity instance associated with the given EntityKey
Object
getEntity(EntityUniqueKey euk)
Get an entity cached by unique key
Map
getEntityEntries()
EntityEntry
getEntry(Object entity)
Retreive the EntityEntry representation of the given entity.
Object
getIndexInOwner(String entity, String property, Object childEntity, Map mergeMap)
Search the persistence context for an index of the child object, given a collection role
LoadContexts
getLoadContexts()
Serializable
getLoadedCollectionOwnerIdOrNull(PersistentCollection collection)
Get the ID for the entity that owned this persistent collection when it was loaded
Object
getLoadedCollectionOwnerOrNull(PersistentCollection collection)
Get the entity that owned this persistent collection when it was loaded
Object[]
getNaturalIdSnapshot(Serializable id, EntityPersister persister)
HashSet
getNullifiableEntityKeys()
Retrieve the set of EntityKeys representing nullifiable references
Serializable
getOwnerId(String entityName, String propertyName, Object childEntity, Map mergeMap)
Search this persistence context for an associated entity instance which is considered the "owner" of the given childEntity, and return that owner's id value.
Object
getProxy(EntityKey key)
Get an existing proxy by key
SessionImplementor
getSession()
Serializable
getSnapshot(PersistentCollection coll)
Get the snapshot of the pre-flush collection state
boolean
hasNonReadOnlyEntities()
int
incrementCascadeLevel()
void
initializeNonLazyCollections()
Force initialization of all non-lazy collections encountered during the current two-phase load (actually, this is a no-op, unless this is the "outermost" load)
boolean
isEntryFor(Object entity)
Is there an EntityEntry for this instance?
boolean
isFlushing()
boolean
isPropertyNull(EntityKey ownerKey, String propertyName)
Is the association property belonging to the keyed entity null?
boolean
isStateless()
Object
narrowProxy(Object proxy, EntityPersister persister, EntityKey key, Object object)
If the existing proxy is insufficiently "narrow" (derived), instantiate a new proxy and overwrite the registration of the old one.
Object
proxyFor(Object impl)
Return the existing proxy associated with the given EntityKey, or the argument (the entity associated with the key) if no proxy exists.
Object
proxyFor(EntityPersister persister, EntityKey key, Object impl)
Return the existing proxy associated with the given EntityKey, or the third argument (the entity associated with the key) if no proxy exists.
boolean
reassociateIfUninitializedProxy(Object value)
Takes the given object and, if it represents a proxy, reassociates it with this event source.
void
reassociateProxy(Object value, Serializable id)
If a deleted entity instance is re-saved, and it has a proxy, we need to reset the identifier of the proxy
PersistentCollection
removeCollectionHolder(Object array)
Object
removeEntity(EntityKey key)
Remove an entity from the session cache, also clear up other state associated with the entity, all except for the EntityEntry
EntityEntry
removeEntry(Object entity)
Remove an entity entry from the session cache
Object
removeProxy(EntityKey key)
Remove a proxy from the session cache.
void
replaceDelayedEntityIdentityInsertKeys(EntityKey oldKey, Serializable generatedId)
void
serialize(ObjectOutputStream oos)
Used by the owning session to explicitly control serialization of the persistence context.
void
setEntryStatus(EntityEntry entry, Status status)
void
setFlushing(boolean flushing)
void
setReadOnly(Object entity, boolean readOnly)
String
toString()
Returns a string representation of the object.
Object
unproxy(Object maybeProxy)
Get the entity instance underlying the given proxy, throwing an exception if the proxy is uninitialized.
Object
unproxyAndReassociate(Object maybeProxy)
Possibly unproxy the given reference and reassociate it with the current session.
PersistentCollection
useUnownedCollection(CollectionKey key)

Field Details

NO_ROW

public static final Object NO_ROW

Constructor Details

StatefulPersistenceContext

public StatefulPersistenceContext(SessionImplementor session)
Constructs a PersistentContext, bound to the given session.
Parameters:
session - The session "owning" this context.

Method Details

addCollectionHolder

public void addCollectionHolder(PersistentCollection holder)
Register a PersistentCollection object for an array. Associates a holder with an array - MUST be called after loading array, since the array instance is not created until endLoad().
Specified by:
addCollectionHolder in interface PersistenceContext

addEntity

public EntityEntry addEntity(Object entity,
                             Status status,
                             Object[] loadedState,
                             EntityKey entityKey,
                             Object version,
                             LockMode lockMode,
                             boolean existsInDatabase,
                             EntityPersister persister,
                             boolean disableVersionIncrement,
                             boolean lazyPropertiesAreUnfetched)
Adds an entity to the internal caches.
Specified by:
addEntity in interface PersistenceContext

addEntity

public void addEntity(EntityKey key,
                      Object entity)
Specified by:
addEntity in interface PersistenceContext

addEntity

public void addEntity(EntityUniqueKey euk,
                      Object entity)
Add an entity to the cache by unique key
Specified by:
addEntity in interface PersistenceContext

addEntry

public EntityEntry addEntry(Object entity,
                            Status status,
                            Object[] loadedState,
                            Object rowId,
                            Serializable id,
                            Object version,
                            LockMode lockMode,
                            boolean existsInDatabase,
                            EntityPersister persister,
                            boolean disableVersionIncrement,
                            boolean lazyPropertiesAreUnfetched)
Generates an appropriate EntityEntry instance and adds it to the event source's internal caches.
Specified by:
addEntry in interface PersistenceContext

addInitializedCollection

public CollectionEntry addInitializedCollection(CollectionPersister persister,
                                                PersistentCollection collection,
                                                Serializable id)
            throws HibernateException
add a collection we just pulled out of the cache (does not need initializing)
Specified by:
addInitializedCollection in interface PersistenceContext

addInitializedDetachedCollection

public void addInitializedDetachedCollection(CollectionPersister collectionPersister,
                                             PersistentCollection collection)
            throws HibernateException
add an (initialized) collection that was created by another session and passed into update() (ie. one with a snapshot and existing state on the database)
Specified by:
addInitializedDetachedCollection in interface PersistenceContext

addNewCollection

public void addNewCollection(CollectionPersister persister,
                             PersistentCollection collection)
            throws HibernateException
Add a new collection (ie. a newly created one, just instantiated by the application, with no database state or snapshot)
Specified by:
addNewCollection in interface PersistenceContext
Parameters:
collection - The collection to be associated with the persistence context

addNonLazyCollection

public void addNonLazyCollection(PersistentCollection collection)
Register a collection for non-lazy loading at the end of the two-phase load
Specified by:
addNonLazyCollection in interface PersistenceContext

addNullProperty

public void addNullProperty(EntityKey ownerKey,
                            String propertyName)
Record the fact that the association belonging to the keyed entity is null.
Specified by:
addNullProperty in interface PersistenceContext

addProxy

public void addProxy(EntityKey key,
                     Object proxy)
Add a proxy to the session cache
Specified by:
addProxy in interface PersistenceContext

addUninitializedCollection

public void addUninitializedCollection(CollectionPersister persister,
                                       PersistentCollection collection,
                                       Serializable id)
add a collection we just loaded up (still needs initializing)
Specified by:
addUninitializedCollection in interface PersistenceContext

addUninitializedDetachedCollection

public void addUninitializedDetachedCollection(CollectionPersister persister,
                                               PersistentCollection collection)
add a detached uninitialized collection
Specified by:
addUninitializedDetachedCollection in interface PersistenceContext

addUnownedCollection

public void addUnownedCollection(CollectionKey key,
                                 PersistentCollection collection)
Specified by:
addUnownedCollection in interface PersistenceContext

afterLoad

public void afterLoad()
Call this after finishing a two-phase load
Specified by:
afterLoad in interface PersistenceContext

afterTransactionCompletion

public void afterTransactionCompletion()
Specified by:
afterTransactionCompletion in interface PersistenceContext

beforeLoad

public void beforeLoad()
Call this before begining a two-phase load
Specified by:
beforeLoad in interface PersistenceContext

checkUniqueness

public void checkUniqueness(EntityKey key,
                            Object object)
            throws HibernateException
Attempts to check whether the given key represents an entity already loaded within the current session.
Specified by:
checkUniqueness in interface PersistenceContext
Parameters:
object - The entity reference against which to perform the uniqueness check.

clear

public void clear()
Specified by:
clear in interface PersistenceContext

containsCollection

public boolean containsCollection(PersistentCollection collection)
Specified by:
containsCollection in interface PersistenceContext

containsEntity

public boolean containsEntity(EntityKey key)
Specified by:
containsEntity in interface PersistenceContext

containsProxy

public boolean containsProxy(Object entity)
Specified by:
containsProxy in interface PersistenceContext

decrementCascadeLevel

public int decrementCascadeLevel()
Specified by:
decrementCascadeLevel in interface PersistenceContext

deserialize

public static StatefulPersistenceContext deserialize(ObjectInputStream ois,
                                                     SessionImplementor session)
            throws IOException,
                   ClassNotFoundException

getBatchFetchQueue

public BatchFetchQueue getBatchFetchQueue()
Get the BatchFetchQueue, instantiating one if necessary.
Specified by:
getBatchFetchQueue in interface PersistenceContext

getCachedDatabaseSnapshot

public Object[] getCachedDatabaseSnapshot(EntityKey key)
Retrieve the cached database snapshot for the requested entity key.

This differs from getDatabaseSnapshot(Serializable,EntityPersister) is two important respects:

  1. no snapshot is obtained from the database if not already cached
  2. an entry of NO_ROW here is interpretet as an exception
Specified by:
getCachedDatabaseSnapshot in interface PersistenceContext
Parameters:
key - The entity key for which to retrieve the cached snapshot
Returns:
The cached snapshot

getCascadeLevel

public int getCascadeLevel()
Do we already know that the entity does not exist in the database?
Specified by:
getCascadeLevel in interface PersistenceContext

getCollection

public PersistentCollection getCollection(CollectionKey collectionKey)
Get the collection instance associated with the CollectionKey
Specified by:
getCollection in interface PersistenceContext

getCollectionEntries

public Map getCollectionEntries()
Specified by:
getCollectionEntries in interface PersistenceContext

getCollectionEntry

public CollectionEntry getCollectionEntry(PersistentCollection coll)
Get the collection entry for a persistent collection
Specified by:
getCollectionEntry in interface PersistenceContext

getCollectionEntryOrNull

public CollectionEntry getCollectionEntryOrNull(Object collection)
Get the collection entry for a collection passed to filter, which might be a collection wrapper, an array, or an unwrapped collection. Return null if there is no entry.
Specified by:
getCollectionEntryOrNull in interface PersistenceContext

getCollectionHolder

public PersistentCollection getCollectionHolder(Object array)
Get the PersistentCollection object for an array
Specified by:
getCollectionHolder in interface PersistenceContext

getCollectionOwner

public Object getCollectionOwner(Serializable key,
                                 CollectionPersister collectionPersister)
            throws MappingException
Get the entity that owns this persistent collection
Specified by:
getCollectionOwner in interface PersistenceContext

getCollectionsByKey

public Map getCollectionsByKey()
Specified by:
getCollectionsByKey in interface PersistenceContext

getDatabaseSnapshot

public Object[] getDatabaseSnapshot(Serializable id,
                                    EntityPersister persister)
            throws HibernateException
Get the current state of the entity as known to the underlying database, or null if there is no corresponding row
Specified by:
getDatabaseSnapshot in interface PersistenceContext

getEntitiesByKey

public Map getEntitiesByKey()
Specified by:
getEntitiesByKey in interface PersistenceContext

getEntity

public Object getEntity(EntityKey key)
Get the entity instance associated with the given EntityKey
Specified by:
getEntity in interface PersistenceContext

getEntity

public Object getEntity(EntityUniqueKey euk)
Get an entity cached by unique key
Specified by:
getEntity in interface PersistenceContext

getEntityEntries

public Map getEntityEntries()
Specified by:
getEntityEntries in interface PersistenceContext

getEntry

public EntityEntry getEntry(Object entity)
Retreive the EntityEntry representation of the given entity.
Specified by:
getEntry in interface PersistenceContext
Parameters:
entity - The entity for which to locate the EntityEntry.
Returns:
The EntityEntry for the given entity.

getIndexInOwner

public Object getIndexInOwner(String entity,
                              String property,
                              Object childEntity,
                              Map mergeMap)
Search the persistence context for an index of the child object, given a collection role
Specified by:
getIndexInOwner in interface PersistenceContext

getLoadContexts

public LoadContexts getLoadContexts()
Specified by:
getLoadContexts in interface PersistenceContext

getLoadedCollectionOwnerIdOrNull

public Serializable getLoadedCollectionOwnerIdOrNull(PersistentCollection collection)
Get the ID for the entity that owned this persistent collection when it was loaded
Specified by:
getLoadedCollectionOwnerIdOrNull in interface PersistenceContext
Parameters:
collection - The persistent collection
Returns:
the owner ID if available from the collection's loaded key; otherwise, returns null

getLoadedCollectionOwnerOrNull

public Object getLoadedCollectionOwnerOrNull(PersistentCollection collection)
Get the entity that owned this persistent collection when it was loaded
Specified by:
getLoadedCollectionOwnerOrNull in interface PersistenceContext
Parameters:
collection - The persistent collection
Returns:
the owner, if its entity ID is available from the collection's loaded key and the owner entity is in the persistence context; otherwise, returns null

getNaturalIdSnapshot

public Object[] getNaturalIdSnapshot(Serializable id,
                                     EntityPersister persister)
            throws HibernateException
Specified by:
getNaturalIdSnapshot in interface PersistenceContext

getNullifiableEntityKeys

public HashSet getNullifiableEntityKeys()
Retrieve the set of EntityKeys representing nullifiable references
Specified by:
getNullifiableEntityKeys in interface PersistenceContext

getOwnerId

public Serializable getOwnerId(String entityName,
                               String propertyName,
                               Object childEntity,
                               Map mergeMap)
Search this persistence context for an associated entity instance which is considered the "owner" of the given childEntity, and return that owner's id value. This is performed in the scenario of a uni-directional, non-inverse one-to-many collection (which means that the collection elements do not maintain a direct reference to the owner).

As such, the processing here is basically to loop over every entity currently associated with this persistence context and for those of the correct entity (sub) type to extract its collection role property value and see if the child is contained within that collection. If so, we have found the owner; if not, we go on.

Also need to account for mergeMap which acts as a local copy cache managed for the duration of a merge operation. It represents a map of the detached entity instances pointing to the corresponding managed instance.

Specified by:
getOwnerId in interface PersistenceContext
Parameters:
entityName - The entity name for the entity type which would own the child
propertyName - The name of the property on the owning entity type which would name this child association.
childEntity - The child entity instance for which to locate the owner instance id.
mergeMap - A map of non-persistent instances from an on-going merge operation (possibly null).
Returns:
The id of the entityName instance which is said to own the child; null if an appropriate owner not located.

getProxy

public Object getProxy(EntityKey key)
Get an existing proxy by key
Specified by:
getProxy in interface PersistenceContext

getSession

public SessionImplementor getSession()
Specified by:
getSession in interface PersistenceContext

getSnapshot

public Serializable getSnapshot(PersistentCollection coll)
Get the snapshot of the pre-flush collection state
Specified by:
getSnapshot in interface PersistenceContext

hasNonReadOnlyEntities

public boolean hasNonReadOnlyEntities()
Specified by:
hasNonReadOnlyEntities in interface PersistenceContext

incrementCascadeLevel

public int incrementCascadeLevel()
Specified by:
incrementCascadeLevel in interface PersistenceContext

initializeNonLazyCollections

public void initializeNonLazyCollections()
            throws HibernateException
Force initialization of all non-lazy collections encountered during the current two-phase load (actually, this is a no-op, unless this is the "outermost" load)
Specified by:
initializeNonLazyCollections in interface PersistenceContext

isEntryFor

public boolean isEntryFor(Object entity)
Is there an EntityEntry for this instance?
Specified by:
isEntryFor in interface PersistenceContext

isFlushing

public boolean isFlushing()
Specified by:
isFlushing in interface PersistenceContext

isPropertyNull

public boolean isPropertyNull(EntityKey ownerKey,
                              String propertyName)
Is the association property belonging to the keyed entity null?
Specified by:
isPropertyNull in interface PersistenceContext

isStateless

public boolean isStateless()
Specified by:
isStateless in interface PersistenceContext

narrowProxy

public Object narrowProxy(Object proxy,
                          EntityPersister persister,
                          EntityKey key,
                          Object object)
            throws HibernateException
If the existing proxy is insufficiently "narrow" (derived), instantiate a new proxy and overwrite the registration of the old one. This breaks == and occurs only for "class" proxies rather than "interface" proxies. Also init the proxy to point to the given target implementation if necessary.
Specified by:
narrowProxy in interface PersistenceContext
Parameters:
proxy - The proxy instance to be narrowed.
persister - The persister for the proxied entity.
key - The internal cache key for the proxied entity.
object - (optional) the actual proxied entity instance.
Returns:
An appropriately narrowed instance.

proxyFor

public Object proxyFor(Object impl)
            throws HibernateException
Return the existing proxy associated with the given EntityKey, or the argument (the entity associated with the key) if no proxy exists. (slower than the form above)
Specified by:
proxyFor in interface PersistenceContext

proxyFor

public Object proxyFor(EntityPersister persister,
                       EntityKey key,
                       Object impl)
            throws HibernateException
Return the existing proxy associated with the given EntityKey, or the third argument (the entity associated with the key) if no proxy exists. Init the proxy to the target implementation, if necessary.
Specified by:
proxyFor in interface PersistenceContext

reassociateIfUninitializedProxy

public boolean reassociateIfUninitializedProxy(Object value)
            throws MappingException
Takes the given object and, if it represents a proxy, reassociates it with this event source.
Specified by:
reassociateIfUninitializedProxy in interface PersistenceContext
Parameters:
value - The possible proxy to be reassociated.
Returns:
Whether the passed value represented an actual proxy which got initialized.

reassociateProxy

public void reassociateProxy(Object value,
                             Serializable id)
            throws MappingException
If a deleted entity instance is re-saved, and it has a proxy, we need to reset the identifier of the proxy
Specified by:
reassociateProxy in interface PersistenceContext

removeCollectionHolder

public PersistentCollection removeCollectionHolder(Object array)
Specified by:
removeCollectionHolder in interface PersistenceContext

removeEntity

public Object removeEntity(EntityKey key)
Remove an entity from the session cache, also clear up other state associated with the entity, all except for the EntityEntry
Specified by:
removeEntity in interface PersistenceContext

removeEntry

public EntityEntry removeEntry(Object entity)
Remove an entity entry from the session cache
Specified by:
removeEntry in interface PersistenceContext

removeProxy

public Object removeProxy(EntityKey key)
Remove a proxy from the session cache.

Additionally, ensure that any load optimization references such as batch or subselect loading get cleaned up as well.

Specified by:
removeProxy in interface PersistenceContext
Parameters:
key - The key of the entity proxy to be removed
Returns:
The proxy reference.

replaceDelayedEntityIdentityInsertKeys

public void replaceDelayedEntityIdentityInsertKeys(EntityKey oldKey,
                                                   Serializable generatedId)
Specified by:
replaceDelayedEntityIdentityInsertKeys in interface PersistenceContext

serialize

public void serialize(ObjectOutputStream oos)
            throws IOException
Used by the owning session to explicitly control serialization of the persistence context.
Parameters:
oos - The stream to which the persistence context should get written

setEntryStatus

public void setEntryStatus(EntityEntry entry,
                           Status status)
Specified by:
setEntryStatus in interface PersistenceContext

setFlushing

public void setFlushing(boolean flushing)
Specified by:
setFlushing in interface PersistenceContext

setReadOnly

public void setReadOnly(Object entity,
                        boolean readOnly)
Specified by:
setReadOnly in interface PersistenceContext

toString

public String toString()
Returns a string representation of the object.
Specified by:
toString in interface PersistenceContext
Returns:
a string representation of the object.

unproxy

public Object unproxy(Object maybeProxy)
            throws HibernateException
Get the entity instance underlying the given proxy, throwing an exception if the proxy is uninitialized. If the given object is not a proxy, simply return the argument.
Specified by:
unproxy in interface PersistenceContext

unproxyAndReassociate

public Object unproxyAndReassociate(Object maybeProxy)
            throws HibernateException
Possibly unproxy the given reference and reassociate it with the current session.
Specified by:
unproxyAndReassociate in interface PersistenceContext
Parameters:
maybeProxy - The reference to be unproxied if it currently represents a proxy.
Returns:
The unproxied instance.

useUnownedCollection

public PersistentCollection useUnownedCollection(CollectionKey key)
Specified by:
useUnownedCollection in interface PersistenceContext