org.eclipse.persistence.descriptors
Class AllFieldsLockingPolicy

java.lang.Object
  org.eclipse.persistence.descriptors.FieldsLockingPolicy
      org.eclipse.persistence.descriptors.AllFieldsLockingPolicy

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, org.eclipse.persistence.internal.descriptors.OptimisticLockingPolicy

public class AllFieldsLockingPolicy
extends FieldsLockingPolicy

Purpose: An implementation of the OptimisticLockingPolicy interface. This policy compares every field in the table in the WHERE clause when doing an update or a delete. If any field has been changed, an optimistic locking exception will be thrown.

NOTE: This policy can only be used inside a unit of work.

See Also:

Serialized Form

Author:

Peter Krogh

Since:

TopLink 2.1

Field Summary

Fields inherited from class org.eclipse.persistence.descriptors.FieldsLockingPolicy

allNonPrimaryKeyFields, descriptor

Constructor Summary

AllFieldsLockingPolicy()
PUBLIC: Create a new all fields locking policy.

Method Summary

void	addLockValuesToTranslationRow(ObjectLevelModifyQuery query) INTERNAL: Values to be included in the locking mechanism are added to the translation row.
protected java.util.Vector	getFieldsToCompare(org.eclipse.persistence.internal.helper.DatabaseTable table, org.eclipse.persistence.internal.sessions.AbstractRecord transRow, org.eclipse.persistence.internal.sessions.AbstractRecord modifyRow) INTERNAL: Returns the fields that should be compared in the where clause.

Methods inherited from class org.eclipse.persistence.descriptors.FieldsLockingPolicy

addLockFieldsToUpdateRow, buildAllNonPrimaryKeyFields, buildDeleteExpression, buildExpression, buildUpdateExpression, clone, compareWriteLockValues, getAllNonPrimaryKeyFields, getAllNonPrimaryKeyFields, getBaseValue, getValueToPutInCache, getVersionDifference, getWriteLockField, getWriteLockUpdateExpression, getWriteLockValue, initialize, initializeProperties, isCascaded, isNewerVersion, isNewerVersion, isPrimaryKey, isStoredInCache, mergeIntoParentCache, setAllNonPrimaryKeyFields, setDescriptor, setupWriteFieldsForInsert, supportsWriteLockValuesComparison, updateRowAndObjectForUpdate, validateDelete, validateUpdate, verifyUsage

Methods inherited from class java.lang.Object

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

Constructor Detail

AllFieldsLockingPolicy

public AllFieldsLockingPolicy()

PUBLIC: Create a new all fields locking policy. A field locking policy is based on locking on all fields by comparing with their previous values to detect field-level collisions. Note: the unit of work must be used for all updates when using field locking.

Method Detail

addLockValuesToTranslationRow

public void addLockValuesToTranslationRow(ObjectLevelModifyQuery query)

INTERNAL: Values to be included in the locking mechanism are added to the translation row. Set the translation row to all the original field values.

Specified by:

addLockValuesToTranslationRow in interface org.eclipse.persistence.internal.descriptors.OptimisticLockingPolicy

Specified by:

addLockValuesToTranslationRow in class FieldsLockingPolicy

getFieldsToCompare

protected java.util.Vector getFieldsToCompare(org.eclipse.persistence.internal.helper.DatabaseTable table,
                                              org.eclipse.persistence.internal.sessions.AbstractRecord transRow,
                                              org.eclipse.persistence.internal.sessions.AbstractRecord modifyRow)

INTERNAL: Returns the fields that should be compared in the where clause. In this case, it is all the fields, except for the primary key and class indicator.

Specified by:

getFieldsToCompare in class FieldsLockingPolicy