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main: [script] [script] [script] [script] [script] [script] [echo] legalName = accessible illegal name = inaccessible test = test echo_task = org.apache.tools.ant.taskdefs.Echo@7a8a02 script_context = org.apache.tools.ant.Project@7ebe1 project = org.apache.tools.ant.Project@7ebe1 invoked via <script>

In this case, you again have three Item objects in persistent state, and touching one of the unloaded bids collections. Now all three Item objects have their bids loaded in a single SELECT. Batch-size settings for entity proxies and collections are also available with annotations, but only as Hibernate extensions:

The legalName property is directly accessible, but because illegal name contains a space, it is only accessible through projectgetProperty The test reference displays test because the Target object has a toString method that returns the target name The script_context reference is provided because of the name attribute on <project>, but it is preferable to access the project reference through project (which you can see is equivalent) An interesting facet to the <script> task is the ability to script the actual invocation of other targets, as shown by the invocation of the echo_task task You can use <script> to configure a task before it runs but remember that any attributes set in the task have priority, because they are set just before the task executes 2012 Scripting summary The scripting framework is very powerful.

@Entity @Table(name = "USERS") @org.hibernate.annotations.BatchSize(size = 10) public class User { ... } @Entity public class Item { ... @OneToMany

@org.hibernate.annotations.BatchSize(size = 10) private Set<Bid> bids = new HashSet<Bid>(); ... }

Any Java class can be used by giving its full package name, and objects in the build file can be referred to by using the names or id values assigned to them Usually, it is rare to see any task declaration in an Ant file given an id, but to access tasks within <script> code, an id is needed We could cover the <script> task in more detail, providing many examples of its use However, we prefer to encourage readers to write full Java tasks instead, as covered in chapter 19 For all the power the <script> task offers, it does not keep a build file simple, and it limits the reuse opportunities of the code Too much use of the task often indicates that someone is trying to turn a build file into a make file, or that it is time to refactor the script into an Ant task.

Prefetching proxies and collections with a batch strategy is really a blind guess. It s a smart optimization that can significantly reduce the number of SQL statements that are otherwise necessary to initialize all the objects you re working with. The only downside of prefetching is, of course, that you may prefetch data you won t need in the end. The trade-off is possibly higher memory consumption, with fewer SQL statements. The latter is often much more important: Memory is cheap, but scaling database servers isn t. Another prefetching algorithm that isn t a blind guess uses subselects to initialize many collections with a single statement.

The counter argument is that <script> code gives you power without writing and distributing Java libraries, and is faster to write If a project does use script tasks, then the best way to stay in control is to pull the scripts out into individual files and then use the <script file="randomjs"> option to refer to the file directly This lets you keep the scripts separate from the build; and they may be reused more easily The other issue is that the scripting framework is uninformative when things do not work For example, casting with (int) to convert the floating point random number to an integer caused the error undefined: identifier is a reserved word (<ANT>; line 3) 501.

Let s take the last example and apply a (probably) better prefetch optimization:

when executing the script. JavaScript, or ECMAScript to give its official name, is not Java, yet it is close enough to mislead. Besides the Ant documentation, a useful online resource for the <script> task lives at http://www.sitepen.com/ant/javascript.html.

List allItems = session.createQuery("from Item").list(); processBids( (Item)allItems.get(0) ); processBids( (Item)allItems.get(1) ); processBids( (Item)allItems.get(2) );