org.eclipse.persistence.internal.indirection

Class ProtectedValueHolder

java.lang.Object

org.eclipse.persistence.internal.indirection.DatabaseValueHolder

org.eclipse.persistence.internal.indirection.ProtectedValueHolder

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ValueHolderInterface, WeavedAttributeValueHolderInterface, WrappingValueHolder

public class ProtectedValueHolder
extends DatabaseValueHolder
implements WrappingValueHolder

Purpose: provides a value holder type that can be used in Protected instances of Entities. Similar to UnitOfWork Value Holder it wraps the original cache version.

Since:

EclipseLink 2.2

Author:

Gordon Yorke

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.eclipse.persistence.indirection.ValueHolderInterface

shouldToStringInstantiate

Constructor Summary

Constructors

Constructor and Description
ProtectedValueHolder(ValueHolderInterface attributeValue, DatabaseMapping mapping, AbstractSession cloningSession)

Method Summary

Modifier and Type	Method and Description
ValueHolderInterface	getWrappedValueHolder() Returns the valueholder that is wrapped by this ValueHolder
java.lang.Object	instantiateForUnitOfWorkValueHolder(UnitOfWorkValueHolder unitOfWorkValueHolder) Triggers UnitOfWork valueholders directly without triggering the wrapped valueholder (this).
boolean	isPessimisticLockingValueHolder() Answers if this valueholder is a pessimistic locking one.

Methods inherited from class org.eclipse.persistence.internal.indirection.DatabaseValueHolder

clone, getRow, getSession, getValue, getValue, isCoordinatedWithProperty, isEasilyInstantiated, isInstantiated, isNewlyWeavedValueHolder, isSerializedRemoteUnitOfWorkValueHolder, postInstantiate, privilegedSetValue, releaseWrappedValueHolder, setInstantiated, setIsCoordinatedWithProperty, setIsNewlyWeavedValueHolder, setRow, setSession, setUninstantiated, setValue, shouldAllowInstantiationDeferral, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ProtectedValueHolder

public ProtectedValueHolder(ValueHolderInterface attributeValue,
                            DatabaseMapping mapping,
                            AbstractSession cloningSession)

Method Detail

instantiateForUnitOfWorkValueHolder

public java.lang.Object instantiateForUnitOfWorkValueHolder(UnitOfWorkValueHolder unitOfWorkValueHolder)

Description copied from class: DatabaseValueHolder

Triggers UnitOfWork valueholders directly without triggering the wrapped valueholder (this).

When in transaction and/or for pessimistic locking the UnitOfWorkValueHolder needs to be triggered directly without triggering the wrapped valueholder. However only the wrapped valueholder knows how to trigger the indirection, i.e. it may be a batchValueHolder, and it stores all the info like the row and the query. Note: Implementations of this method are not necessarily thread-safe. They must be used in a synchronized manner

Specified by:

instantiateForUnitOfWorkValueHolder in class DatabaseValueHolder

isPessimisticLockingValueHolder

public boolean isPessimisticLockingValueHolder()

Description copied from class: DatabaseValueHolder

Answers if this valueholder is a pessimistic locking one. Such valueholders are special in that they can be triggered multiple times by different UnitsOfWork. Each time a lock query will be issued. Hence even if instantiated it may have to be instantiated again, and once instantiated all fields can not be reset. Note: Implementations of this method are not necessarily thread-safe. They must be used in a synchronizaed manner

Specified by:

isPessimisticLockingValueHolder in class DatabaseValueHolder

getWrappedValueHolder

public ValueHolderInterface getWrappedValueHolder()

Description copied from interface: WrappingValueHolder

Returns the valueholder that is wrapped by this ValueHolder

Specified by:

getWrappedValueHolder in interface WrappingValueHolder

Overrides:

getWrappedValueHolder in class DatabaseValueHolder