net.sf.basedb.core.log
Class LoggingInterceptor

java.lang.Object
  org.hibernate.EmptyInterceptor
      net.sf.basedb.core.log.LoggingInterceptor

All Implemented Interfaces:

Serializable, org.hibernate.Interceptor

public class LoggingInterceptor
extends org.hibernate.EmptyInterceptor

Interceptor that attaches to Hibernate sessions to provide logging of items that are updated/created/deleted. Do not attach this interceptor to a SessionFactory since this class is not thread-safe.

The interceptor uses onSave, onDelete and onFlushDirty to collect information about what has happened. The LogManagerFactory is asked to create EntityLogger:s for each modified/created/deleted item. The actual logging takes place in the postFlush method that calls EntityLogger.logChanges(LogManager, EntityDetails) on each entity logger.

NOTE! For new items, the ID is not available until after the flush to the database has been done. Eg. new items has a 0 id when LogManagerFactory.getEntityLogger(LogManager, Object) is called.

Version:

2.13

Author:

Nicklas

See Also:

Serialized Form

Last modified

$Date: 2010-08-13 10:50:27 +0200 (Fri, 13 Aug 2010) $

Field Summary

private List<EntityDetails>	changes
private LogControl	logControl
private LogManager	logManager
private LogManagerFactory	logManagerFactory
private static long	serialVersionUID

Fields inherited from class org.hibernate.EmptyInterceptor

INSTANCE

Constructor Summary

LoggingInterceptor(LogControl logControl, LogManagerFactory logManagerFactory)
Creates a new interceptor.

Method Summary

private void	addChange(ChangeType action, Object entity, Object[] state, Object[] previousState, String[] propertyNames, org.hibernate.type.Type[] types) If the log manager factory creates an entity logger, add information about the change to the internal list.
void	afterTransactionCompletion(org.hibernate.Transaction tx) Signals successful commit or rollback to the log manager.
void	onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, org.hibernate.type.Type[] types) Adds a DELETE event to the log.
boolean	onFlushDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState, String[] propertyNames, org.hibernate.type.Type[] types) Adds an UPDATE event to the log.
boolean	onSave(Object entity, Serializable id, Object[] state, String[] propertyNames, org.hibernate.type.Type[] types) Adds a CREATE event to the log.
void	postFlush(Iterator entities) Collects all log events and sends them to the each EntityLogger.
private void	readObject(ObjectInputStream ois)
private void	writeObject(ObjectOutputStream ois)

Methods inherited from class org.hibernate.EmptyInterceptor

afterTransactionBegin, beforeTransactionCompletion, findDirty, getEntity, getEntityName, instantiate, isTransient, onCollectionRecreate, onCollectionRemove, onCollectionUpdate, onLoad, onPrepareStatement, preFlush

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

logControl

private final LogControl logControl

logManagerFactory

private final LogManagerFactory logManagerFactory

logManager

private LogManager logManager

changes

private List<EntityDetails> changes

Constructor Detail

LoggingInterceptor

public LoggingInterceptor(LogControl logControl,
                          LogManagerFactory logManagerFactory)

Creates a new interceptor.

Parameters:

logControl - The LogControl that is managing the current transaction

logManagerFactory - The log manager factory to use for logging

Method Detail

onSave

public boolean onSave(Object entity,
                      Serializable id,
                      Object[] state,
                      String[] propertyNames,
                      org.hibernate.type.Type[] types)

Adds a CREATE event to the log.

Specified by:

onSave in interface org.hibernate.Interceptor

Overrides:

onSave in class org.hibernate.EmptyInterceptor

Returns:

Always false, since the state is not modified

onFlushDirty

public boolean onFlushDirty(Object entity,
                            Serializable id,
                            Object[] currentState,
                            Object[] previousState,
                            String[] propertyNames,
                            org.hibernate.type.Type[] types)

Adds an UPDATE event to the log.

Specified by:

onFlushDirty in interface org.hibernate.Interceptor

Overrides:

onFlushDirty in class org.hibernate.EmptyInterceptor

Returns:

Always false, since the state is not changed

onDelete

public void onDelete(Object entity,
                     Serializable id,
                     Object[] state,
                     String[] propertyNames,
                     org.hibernate.type.Type[] types)

Adds a DELETE event to the log.

Specified by:

onDelete in interface org.hibernate.Interceptor

Overrides:

onDelete in class org.hibernate.EmptyInterceptor

postFlush

public void postFlush(Iterator entities)

Collects all log events and sends them to the each EntityLogger.

Specified by:

postFlush in interface org.hibernate.Interceptor

Overrides:

postFlush in class org.hibernate.EmptyInterceptor

afterTransactionCompletion

public void afterTransactionCompletion(org.hibernate.Transaction tx)

Signals successful commit or rollback to the log manager. Note that this happens after the transaction/connection has been closed and no communication with the database can take place here.

Specified by:

afterTransactionCompletion in interface org.hibernate.Interceptor

Overrides:

afterTransactionCompletion in class org.hibernate.EmptyInterceptor

addChange

private void addChange(ChangeType action,
                       Object entity,
                       Object[] state,
                       Object[] previousState,
                       String[] propertyNames,
                       org.hibernate.type.Type[] types)

If the log manager factory creates an entity logger, add information about the change to the internal list. The list is processed in the postFlush(Iterator) method.

readObject

private void readObject(ObjectInputStream ois)
                 throws ClassNotFoundException,
                        IOException

Throws:

ClassNotFoundException

IOException

writeObject

private void writeObject(ObjectOutputStream ois)
                  throws IOException

Throws:

IOException