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We call setTaskName with our current task name, from getTaskName(), so the output is prefixed with our custom task name instead of [java]. In this case, output from Searcher will be prefixed by [searcher]. The SearcherTask shown in listing 19.6 demonstrates several key techniques useful for wrapping a Java program within a task fa ade. Most importantly it provides flexibility in how the classpath is specified, allowing either a classpath or classpathref attribute, or nested <classpath> elements. Each of these required work in our task code, but the effort was minimal thanks to Ant s API. The main trick employed in SearcherTask is the use of the <java> task internally. While this does have a hackish feel to it, it s the easiest way to deal with the complexities of forking, classpath, command-line parameters, and JVM parameters. From the knowledge you ve gained in this chapter about how Ant populates tasks with data, you are equipped with the know-how to see how this is working. We simply call the setters and other special methods, such as the create/add-prefixed methods, just as Ant would do if we used <java> literally in a build file. 492

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Item item = (Item) session.get(Item.class, new Long(123)); User seller = item.getSeller();

Before Ant 1.5, tasks could not dynamically add new attributes or elements at run time. As an example of this, you cannot add new <condition> tests, or other elements, inside <ejbjar> without changing Ant s source. Any task that needed to be dynamically extensible had to do so in an ugly manner. For example, a task that needed to support user-defined parameters would typically be specified like this in a build file:

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The first line retrieves an Item object into persistent state. The second line accesses the seller of that Item. This call to getSeller() is intercepted by Hibernate and triggers the loading of the User in question. Note how proxies are more lazy than interception: You can call item.getSeller().getId() without forcing initialization of the proxy. This makes interception less useful if you only want to set references, as we discussed earlier. You can also lazy load properties that are mapped with <property> or <component>; here the attribute that enables interception is lazy="true", in Hibernate XML mappings. With annotations, @Basic(fetch = FetchType.LAZY) is a hint

for Hibernate that a property or component should be lazy loaded through interception. To disable proxies and enable interception for associations with annotations, you have to rely on a Hibernate extension:

@ManyToOne @JoinColumn(name="SELLER_ID", nullable = false, updatable = false) @org.hibernate.annotations.LazyToOne( org.hibernate.annotations.LazyToOneOption.NO_PROXY ) private User seller;

It would be written in Java code in this manner:

To enable interception, the bytecode of your classes must be instrumented after compilation, before runtime. Hibernate provides an Ant task for that purpose:

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package org.example.antbook.tasks; import org.apache.tools.ant.Task; import java.util.Vector; import java.util.Iterator; public class ParamTask extends Task { private Vector params = new Vector(); public Param createParam() { Param p = new Param(); params.add(p); return p; } public void execute() { Iterator iter = params.iterator(); while (iter.hasNext()) { Param p = (Param) iter.next(); log(p.getName() + " = " + p.getValue()); } } public static class Param { private String name; private String value; public String getName() { return name; } public void setName(String name) { this.name = name; }

public String getValue() { return value; } public void setValue(String value) { this.value = value; } } }

We leave it up to you if you want to utilize interception for lazy loading in our experience, good use cases are rare. Naturally, you not only want to define what part of your persistent object network must be loaded, but also how these objects are retrieved. In addition to creating a fetch plan, you want to optimize it with the right fetching strategies.

Hibernate executes SQL SELECT statements to load objects into memory. If you load an object, a single or several SELECTs are executed, depending on the number of tables which are involved and the fetching strategy you ve applied. Your goal is to minimize the number of SQL statements and to simplify the SQL statements, so that querying can be as efficient as possible. You do this by applying the best fetching strategy for each collection or association. Let s walk through the different options step by step.

It is nicer to have user-defined parameters specified as attributes to our task, rather than the clunkier <param> subelements.

By default, Hibernate fetches associated objects and collections lazily whenever you access them (we assume that you map all to-one associations as FetchType. LAZY if you use Java Persistence). Look at the following trivial code example:

Ant 1.5 added a dynamic configuration mechanism to let you do just that. The changes haven t trickled into Ant s own tasks, yet, but you can use it in your own code. With the DynamicConfigurator interface, your task can support new attributes and elements. See listing 19.7.

Item item = (Item) session.get(Item.class, new Long(123));

package org.example.antbook.tasks; import org.apache.tools.ant.BuildException; import org.apache.tools.ant.DynamicConfigurator; import org.apache.tools.ant.Task; import java.util.Enumeration; import java.util.Properties; public class DynaTask extends Task implements DynamicConfigurator { private Properties params = new Properties(); public void setDynamicAttribute(String name, String value) throws BuildException { params.setProperty(name, value); }

You didn t configure any association or collection to be nonlazy, and that proxies can be generated for all associations. Hence, this operation results in the following SQL SELECT:

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