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Auditable entity = (Auditable) it.next(); AuditLog.logEvent("create", entity, userId, session.connection()); } for (Iterator it = updates.iterator(); it.hasNext();) { Auditable entity = (Auditable) it.next(); AuditLog.logEvent("update", entity, userId, session.connection()); } } finally { inserts.clear(); updates.clear(); } } }

The Hibernate Interceptor API has many more methods than shown in this example. Because you re extending the EmptyInterceptor, instead of implementing the interface directly, you can rely on default semantics of all methods you don t override. The interceptor has two interesting aspects. This interceptor needs the session and userId attributes to do its work; a client using this interceptor must set both properties. The other interesting aspect is the audit-log routine in onSave() and onFlushDirty(): You add new and updated entities to the inserts and updates collections. The onSave() interceptor method is called whenever an entity is saved by Hibernate; the onFlushDirty() method is called whenever Hibernate detects a dirty object. The actual logging of the audit trail is done in the postFlush() method, which Hibernate calls after executing the SQL that synchronizes the persistence context with the database. You use the static call AuditLog.logEvent() (a class and method we discuss next) to log the event. Note that you can t log events in onSave(), because the identifier value of a transient entity may not be known at this point. Hibernate guarantees to set entity identifiers during flush, so postFlush() is the correct place to log this information. Also note how you use the session: You pass the JDBC connection of a given Session to the static call to AuditLog.logEvent(). There is a good reason for this, as we ll discuss in more detail. Let s first tie it all together and see how you enable the new interceptor.

Our task s execute method demonstrates that we have an instance of the Hex class by logging the hexadecimal value and the integer value.

Enabling the interceptor You need to assign the Interceptor to a Hibernate Session when you first open the session:

public void execute() { if (hex != null) { log(hex + " = " + hex.intValue()); } }

AuditLogInterceptor interceptor = new AuditLogInterceptor(); Session session = getSessionFactory().openSession(interceptor); Transaction tx = session.beginTransaction(); interceptor.setSession(session); interceptor.setUserId( currentUser.getId() ); session.save(newItem); // Triggers onSave() of the Interceptor tx.commit(); session.close();

Our build file specifies a hexadecimal number:

The interceptor is active for the Session you open it with. If you work with sessionFactory.getCurrentSession(), you don t control the opening of a Session; it s handled transparently by one of Hibernate s built-in implementations of CurrentSessionContext. You can write your own (or extend an existing) CurrentSessionContext implementation and supply your own routine for opening the current Session and assigning an interceptor to it. Another way to enable an interceptor is to set it globally on the Configuration with setInterceptor() before building the SessionFactory. However, any interceptor that is set on a Configuration and active for all Sessions must be implemented thread-safe! The single Interceptor instance is shared by concurrently running Sessions. The AuditLogInterceptor implementation isn t thread-safe: It uses member variables (the inserts and updates queues). You can also set a shared thread-safe interceptor that has a no-argument constructor for all EntityManager instances in JPA with the following configuration option in persistence.xml:

<persistence-unit name="..."> <properties> <property name="hibernate.ejb.interceptor" value="my.ThreadSafeInterceptorImpl"/> ... </properties> </persistence-unit>

Our Hex class is perhaps a bit misnamed, as it actually will accept any legitimately specified decimal, octal, or hexadecimal formatted value and decode it properly. It does, however, effectively demonstrate that it is easy to support attributes using whatever types are most appropriate for your custom task. HOW TASKS GET DATA 479

Let s get back to that interesting Session-handling code in the interceptor and find out why you pass the connection() of the current Session to AuditLog. logEvent().

Datatype references Reusable datatypes is one of Ant s greatest strengths. Datatypes used as nested elements implicitly support reuse without any additional coding efforts, but if your task needs to accept an id of a previously defined datatype as attribute, use the org. apache.tools.ant.types.Reference type. This is really a special case of the String-arg constructor capabilities. To accept a path datatype as a reference for a classpathref attribute, implement setClasspathRef:

Using a temporary Session It should be clear why you require a Session inside the AuditLogInterceptor. The interceptor has to create and persist AuditLogRecord objects, so a first attempt for the onSave() method could be the following routine:

public void setClasspathRef(Reference r) { createClasspath().setRefid(r); }