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Table 12.2 JPA event callbacks and annotations Description Triggered after an entity instance has been loaded with find() or getReference(), or when a Java Persistence query is executed. Also called after the refresh() method is invoked. Occurs immediately when persist() is called on an entity, and after the database insert. Executed before and after the persistence context is synchronized with the database that is, before and after flushing. Triggered only when the state of the entity requires synchronization (for example, because it s considered dirty). Triggered when remove() is called or the entity instance is removed by cascading, and after the database delete.

In this case CDATA is needed because the < character is still illegal in element body text unless inside a CDATA section. It is important to note that Ant properties are not expanded automatically before calling addText. We demonstrate the use of addText in section 19.4.2 as well as how to have properties expanded if desired.

Unlike Hibernate interceptors, entity listeners are stateless classes. You therefore can t rewrite the previous Hibernate audit-logging example with entity listeners, because you d need to hold the state of modified objects in local queues. Another problem is that an entity listener class isn t allowed to use the EntityManager. Certain JPA implementations, such as Hibernate, let you again apply the trick with a temporary second persistence context, but you should look at EJB 3.0 interceptors for session beans and probably code this audit-logging at a higher layer in your application stack.

Our tasks from now on will extend from org.apache.tools.ant.Task. The primary reason for subclassing from Task is to gain access to Ant s internal APIs. The Task class provides the following: Access to the containing target Access to the current project Logging facilities A class that does not extend from Task can still gain access to the project instance and logging facilities through that instance by implementing a setProject method:

12.4 Summary

public void setProject (org.apache.tools.ant.Project project)

In this chapter, you learned how to work with large and complex datasets efficiently. We first looked at Hibernate s cascading options and how transitive persistence can be enabled with Java Persitence and annotations. Then we covered the bulk operations in HQL and JPA QL and how you write batch procedures that work on a subset of data to avoid memory exhaustion. In the last section, you learned how to enable Hibernate data filtering and how you can create dynamic data views at the application level. Finally, we introduced the Hibernate Interceptor extension point, the Hibernate core event system, and the standard Java Persistence entity callback mechanism. Table 12.3 shows a summary you can use to compare native Hibernate features and Java Persistence. In the next chapter, we switch perspective and discuss how you retrieve objects from the database with the best-performing fetching and caching strategy.

Table 12.3 Hibernate and JPA comparison chart for chapter 12 Hibernate Core Hibernate supports transitive persistence with cascading options for all operations. Java Persistence and EJB 3.0 Transitive persistence model with cascading options equivalent to Hibernate. Use Hibernate annotations for special cases. JPA QL supports direct bulk UPDATE and DELETE.

This makes extending from Task unnecessary for all practical purposes. The best reason not to do so would be to avoid a dependency on Ant from your class, as well as to keep your own inheritance hierarchy. But if you are going to have a setProject method, you ve already created an Ant dependency. As for the argument of keeping your own inheritance hierarchy, we recommend encapsulating your other Java classes inside a Task subclass; this acts as a wrapper and allows you to change the inner workings of your encapsulated code and keep the task and build file interface unchanged. 19.4.1 Adding an attribute to a task In keeping with our recommendations, here is a basic Ant task that extends from Task. It also demonstrates an optional attribute:

Hibernate supports bulk UPDATE, DELETE, and INSERT ... SELECT operations in polymorphic HQL, which are executed directly in the database. Hibernate supports query result cursors for batch updates. Powerful data filtering is available for the creation of dynamic data views. Extension points are available for interception and event listeners.

package org.example.antbook.tasks; import org.apache.tools.ant.Task; public class MessageTask extends Task { private String message = ""; public void setMessage(String message) { this.message = message; } public void execute() { log(message); } }