org.hibernate.envers.strategy

Class ValidityAuditStrategy

java.lang.Object

org.hibernate.envers.strategy.ValidityAuditStrategy

All Implemented Interfaces:

AuditStrategy

Direct Known Subclasses:

ValidTimeAuditStrategy

public class ValidityAuditStrategy
extends Object
implements AuditStrategy

Audit strategy which persists and retrieves audit information using a validity algorithm, based on the start-revision and end-revision of a row in the audit tables.

This algorithm works as follows:

• For a new row that is persisted in an audit table, only the start-revision column of that row is set
• At the same time the end-revision field of the previous audit row is set to this revision
• Queries are retrieved using 'between start and end revision', instead of a subquery.

This has a few important consequences that need to be judged against against each other:

• Persisting audit information is a bit slower, because an extra row is updated
• Retrieving audit information is a lot faster

Constructor Summary

Constructors

Constructor and Description
ValidityAuditStrategy()

Method Summary

Modifier and Type	Method and Description
void	addAssociationAtRevisionRestriction(QueryBuilder rootQueryBuilder, Parameters parameters, String revisionProperty, String revisionEndProperty, boolean addAlias, MiddleIdData referencingIdData, String versionsMiddleEntityName, String eeOriginalIdPropertyPath, String revisionPropertyPath, String originalIdPropertyName, String alias1, boolean inclusive, MiddleComponentData... componentDatas) Update the rootQueryBuilder with an extra WHERE clause to restrict the revision for a middle-entity association.
void	addEntityAtRevisionRestriction(GlobalConfiguration globalCfg, QueryBuilder rootQueryBuilder, Parameters parameters, String revisionProperty, String revisionEndProperty, boolean addAlias, MiddleIdData idData, String revisionPropertyPath, String originalIdPropertyName, String alias1, String alias2, boolean inclusive) Update the rootQueryBuilder with an extra WHERE clause to restrict the revision for a two-entity relation.
void	perform(Session session, String entityName, EnversService enversService, Serializable id, Object data, Object revision) Perform the persistence of audited data for regular entities.
void	performCollectionChange(Session session, String entityName, String propertyName, EnversService enversService, PersistentCollectionChangeData persistentCollectionChangeData, Object revision) Perform the persistence of audited data for collection ("middle") entities.
void	setRevisionTimestampGetter(Getter revisionTimestampGetter)

Methods inherited from class java.lang.Object

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

Constructor Detail

ValidityAuditStrategy

public ValidityAuditStrategy()

Method Detail

perform

public void perform(Session session,
                    String entityName,
                    EnversService enversService,
                    Serializable id,
                    Object data,
                    Object revision)

Description copied from interface: AuditStrategy

Perform the persistence of audited data for regular entities.

Specified by:

perform in interface AuditStrategy

Parameters:

session - Session, which can be used to persist the data.

entityName - Name of the entity, in which the audited change happens

enversService - The EnversService

id - Id of the entity.

data - Audit data to persist

revision - Current revision data

performCollectionChange

public void performCollectionChange(Session session,
                                    String entityName,
                                    String propertyName,
                                    EnversService enversService,
                                    PersistentCollectionChangeData persistentCollectionChangeData,
                                    Object revision)

Description copied from interface: AuditStrategy

Perform the persistence of audited data for collection ("middle") entities.

Specified by:

performCollectionChange in interface AuditStrategy

Parameters:

session - Session, which can be used to persist the data.

entityName - Name of the entity, in which the audited change happens.

propertyName - The name of the property holding the persistent collection

enversService - The EnversService

persistentCollectionChangeData - Collection change data to be persisted.

revision - Current revision data

addEntityAtRevisionRestriction

public void addEntityAtRevisionRestriction(GlobalConfiguration globalCfg,
                                           QueryBuilder rootQueryBuilder,
                                           Parameters parameters,
                                           String revisionProperty,
                                           String revisionEndProperty,
                                           boolean addAlias,
                                           MiddleIdData idData,
                                           String revisionPropertyPath,
                                           String originalIdPropertyName,
                                           String alias1,
                                           String alias2,
                                           boolean inclusive)

Description copied from interface: AuditStrategy

Update the rootQueryBuilder with an extra WHERE clause to restrict the revision for a two-entity relation. This WHERE clause depends on the AuditStrategy, as follows:

• For DefaultAuditStrategy a subquery is created:

  e.revision = (SELECT max(...) ...)

• for ValidityAuditStrategy the revision-end column is used:

  e.revision <= :revision and (e.endRevision > :revision or e.endRevision is null)

Specified by:

addEntityAtRevisionRestriction in interface AuditStrategy

Parameters:

globalCfg - the GlobalConfiguration

rootQueryBuilder - the QueryBuilder that will be updated

parameters - root parameters to which restrictions shall be added

revisionProperty - property of the revision column

revisionEndProperty - property of the revisionEnd column (only used for ValidityAuditStrategy)

addAlias - boolean indicator if a left alias is needed

idData - id-information for the two-entity relation (only used for DefaultAuditStrategy)

revisionPropertyPath - path of the revision property (only used for ValidityAuditStrategy)

originalIdPropertyName - name of the id property (only used for ValidityAuditStrategy)

alias1 - an alias used for subquery (only used for ValidityAuditStrategy)

alias2 - an alias used for subquery (only used for ValidityAuditStrategy)

inclusive - indicates whether revision number shall be treated as inclusive or exclusive

addAssociationAtRevisionRestriction

public void addAssociationAtRevisionRestriction(QueryBuilder rootQueryBuilder,
                                                Parameters parameters,
                                                String revisionProperty,
                                                String revisionEndProperty,
                                                boolean addAlias,
                                                MiddleIdData referencingIdData,
                                                String versionsMiddleEntityName,
                                                String eeOriginalIdPropertyPath,
                                                String revisionPropertyPath,
                                                String originalIdPropertyName,
                                                String alias1,
                                                boolean inclusive,
                                                MiddleComponentData... componentDatas)

Description copied from interface: AuditStrategy

Update the rootQueryBuilder with an extra WHERE clause to restrict the revision for a middle-entity association. This WHERE clause depends on the AuditStrategy, as follows:

• For DefaultAuditStrategy a subquery is created:

  e.revision = (SELECT max(...) ...)

• for ValidityAuditStrategy the revision-end column is used:

  e.revision <= :revision and (e.endRevision > :revision or e.endRevision is null)

Specified by:

addAssociationAtRevisionRestriction in interface AuditStrategy

Parameters:

rootQueryBuilder - the QueryBuilder that will be updated

parameters - root parameters to which restrictions shall be added

revisionProperty - property of the revision column

revisionEndProperty - property of the revisionEnd column (only used for ValidityAuditStrategy)

addAlias - boolean indicator if a left alias is needed

referencingIdData - id-information for the middle-entity association (only used for DefaultAuditStrategy)

versionsMiddleEntityName - name of the middle-entity

eeOriginalIdPropertyPath - name of the id property (only used for ValidityAuditStrategy)

revisionPropertyPath - path of the revision property (only used for ValidityAuditStrategy)

originalIdPropertyName - name of the id property (only used for ValidityAuditStrategy)

alias1 - an alias used for subqueries (only used for DefaultAuditStrategy)

inclusive - indicates whether revision number shall be treated as inclusive or exclusive

componentDatas - information about the middle-entity relation

setRevisionTimestampGetter

public void setRevisionTimestampGetter(Getter revisionTimestampGetter)