Module org.eclipse.persistence.core

Package org.eclipse.persistence.internal.indirection

Class ProtectedValueHolder<T>

java.lang.Object

org.eclipse.persistence.internal.indirection.DatabaseValueHolder<T>

org.eclipse.persistence.internal.indirection.ProtectedValueHolder<T>

All Implemented Interfaces:

Serializable, Cloneable, ValueHolderInterface<T>, WeavedAttributeValueHolderInterface<T>, WrappingValueHolder<T>

public class ProtectedValueHolder<T>
extends DatabaseValueHolder<T>
implements WrappingValueHolder<T>

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

Modifier and Type	Field	Description
protected DatabaseMapping	mapping
protected ValueHolderInterface<T>	wrappedValueHolder

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

isCoordinatedWithProperty, isInstantiated, row, session, value

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

shouldToStringInstantiate

Constructor Summary

Constructors

Constructor	Description
ProtectedValueHolder(ValueHolderInterface<T> attributeValue, DatabaseMapping mapping, AbstractSession cloningSession)

Method Summary

Modifier and Type	Method	Description
ValueHolderInterface<T>	getWrappedValueHolder()	Returns the valueholder that is wrapped by this ValueHolder
protected T	instantiate()	Instantiate the object.
T	instantiateForUnitOfWorkValueHolder(UnitOfWorkValueHolder<T> 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, isTransactionalValueHolder, postInstantiate, privilegedSetValue, releaseWrappedValueHolder, resetFields, setInstantiated, setIsCoordinatedWithProperty, setIsNewlyWeavedValueHolder, setRow, setSession, setUninstantiated, setValue, shouldAllowInstantiationDeferral, toString

Methods inherited from class java.lang.Object

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

Field Detail

wrappedValueHolder

protected transient ValueHolderInterface<T> wrappedValueHolder

mapping

protected transient DatabaseMapping mapping

Constructor Detail

ProtectedValueHolder

public ProtectedValueHolder(ValueHolderInterface<T> attributeValue,
                            DatabaseMapping mapping,
                            AbstractSession cloningSession)

Method Detail

instantiate

protected T instantiate()
                 throws DatabaseException

Description copied from class: DatabaseValueHolder

Instantiate the object.

Specified by:

instantiate in class DatabaseValueHolder<T>

Throws:

DatabaseException

instantiateForUnitOfWorkValueHolder

public T instantiateForUnitOfWorkValueHolder(UnitOfWorkValueHolder<T> 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<T>

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<T>

getWrappedValueHolder

public ValueHolderInterface<T> getWrappedValueHolder()

Description copied from interface: WrappingValueHolder

Returns the valueholder that is wrapped by this ValueHolder

Specified by:

getWrappedValueHolder in interface WrappingValueHolder<T>

Overrides:

getWrappedValueHolder in class DatabaseValueHolder<T>