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package oracle.toplink.essentials.internal.descriptors;
import java.io.Serializable;
import java.util.Vector;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.internal.helper.DatabaseField;
import oracle.toplink.essentials.internal.sessions.ObjectChangeSet;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
public interface OptimisticLockingPolicy extends Cloneable, Serializable {
/**
* INTERNAL:
* Add update fields for template row.
* These are any unmapped fields required to write in an update.
*
* #see this method in VersionLockingPolicy
*/
public void addLockFieldsToUpdateRow(AbstractRecord databaseRow, AbstractSession session);
/**
* INTERNAL:
* The method should update the translation row with the
* correct write lock values. This method is called on a delete.
*
* #see this method in VersionLockingPolicy
*/
public void addLockValuesToTranslationRow(ObjectLevelModifyQuery query);
/**
* INTERNAL:
* When given an expression, this method will return a new expression with
* the optimistic locking values included. This expression will be used
* in a delete call.
*
* #see this method in VersionLockingPolicy
*/
public Expression buildDeleteExpression(oracle.toplink.essentials.internal.helper.DatabaseTable table, Expression mainExpression, AbstractRecord row);
/**
* INTERNAL:
* When given an expression, this method will return a new expression with
* the optimistic locking values included. This expression will be used in
* an update call.
*
* #see this method in VersionLockingPolicy
*/
public Expression buildUpdateExpression(oracle.toplink.essentials.internal.helper.DatabaseTable table, Expression mainExpression, AbstractRecord translationRow, AbstractRecord modifyRow);
public Object clone();
/**
* INTERNAL:
* This method compares two writeLockValues.
* The writeLockValues should be non-null and of the correct type.
* Returns:
* -1 if value1 is less (older) than value2;
* 0 if value1 equals value2;
* 1 if value1 is greater (newer) than value2.
* Throws:
* NullPointerException if the passed value is null;
* ClassCastException if the passed value is of a wrong type.
*/
public int compareWriteLockValues(Object value1, Object value2);
/**
* INTERNAL:
* This is the base value that is older than all other values, it is used in the place of
* null in some situations.
*/
abstract public Object getBaseValue();
/**
* INTERNAL:
* Return the value that should be stored in the identity map.
* If the value is not stored in the cache, then return a null.
*
* #see this method in VersionLockingPolicy
*/
public Object getValueToPutInCache(AbstractRecord row, AbstractSession session);
/**
* PUBLIC:
* Return the number of versions different between these objects.
*/
public int getVersionDifference(Object currentValue, Object domainObject, Vector primaryKeys, AbstractSession session);
/**
* INTERNAL:
* Return the write lock field.
*
* #see this method in VersionLockingPolicy
*/
public DatabaseField getWriteLockField();
/**
* INTERNAL:
* This method will return the optimistic lock value for the object
*
* #see this method in VersionLockingPolicy
*/
public Object getWriteLockValue(Object domainObject, java.util.Vector primaryKey, AbstractSession session);
/**
* INTERNAL:
* This method will return an expression that is used to update its optimistic
* locking field.
*
* #see this method in VersionLockingPolicy
*/
public Expression getWriteLockUpdateExpression(ExpressionBuilder builder);
/**
* INTERNAL:
* It is responsible for initializing the policy.
*
* #see this method in VersionLockingPolicy
*/
public void initialize(AbstractSession session);
/**
* INTERNAL:
* Responsible for pre-initializing.
*
* #see this method in VersionLockingPolicy
*/
public void initializeProperties();
/**
* INTERNAL:
* Update the parent write lock value if the changeSet's is newer
*/
public boolean isChildWriteLockValueGreater(AbstractSession session, java.util.Vector primaryKey, Class original, ObjectChangeSet changeSet);
/**
* INTERNAL:
* Update the parent write lock value if the unit of works has been incremented
*/
public boolean isChildWriteLockValueGreater(UnitOfWorkImpl uow, java.util.Vector primaryKey, Class original);
/**
* INTERNAL:
* Returns true if the value stored with the domainObject is more recent
* than the value . Returns false otherwise.
*
* #see this method in VersionLockingPolicy
*/
public boolean isNewerVersion(Object currentValue, Object domainObject, java.util.Vector primaryKey, AbstractSession session);
/**
* INTERNAL:
* Returns true if the value stored with the domainObject is more recent
* than the value in the row. Returns false otherwise.
* NOTE: This method will only be called if the shouldOnlyRefreshCacheIfNewerVersion()
* flag is set on descriptor.
*
* #see this method in VersionLockingPolicy
*/
public boolean isNewerVersion(AbstractRecord databaseRow, Object domainObject, java.util.Vector primaryKey, AbstractSession session);
/**
* INTERNAL:
* This method should merge changes from the parent into the child.
*
* #see this method in VersionLockingPolicy
*/
public void mergeIntoParentCache(UnitOfWorkImpl uow, java.util.Vector primaryKey, Object object);
/**
* INTERNAL:
* provide a way to set the descriptor for this policy
*/
public void setDescriptor(ClassDescriptor descriptor);
/**
* INTERNAL:
* Add the initial right lock values to the modify
* row in the query. This method will only be called
* on insert.
*
* #see this method in VersionLockingPolicy
*/
public void setupWriteFieldsForInsert(ObjectLevelModifyQuery query);
/**
* INTERNAL:
* This method should update the translation row, the modify
* row and the domain object with th lock value.
*
* #see this method in VersionLockingPolicy
*/
public void updateRowAndObjectForUpdate(ObjectLevelModifyQuery query, Object object);
public void validateDelete(int rowCount, Object object, WriteObjectQuery query);
public void validateUpdate(int rowCount, Object object, WriteObjectQuery query);
/**
* INTERNAL:
* Prepare fetch group for read query
*/
public void prepareFetchGroupForReadQuery(FetchGroup fetchGroup, ObjectLevelReadQuery query);
}
