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Although new vendors or users can easily create the necessary customizations to add to the list of supported deployment tools, Ant s current architecture does not provide the capability to dynamically add subelements to <ejbjar>. Adding new ones requires a change to the actual task code of <ejbjar>. One consequence is that where some vendors provide their own extension elements, they do so by providing their own modified version of the Ant jar files, which can cause no end of confusion. This restriction is unfortunate and needs to be addressed in a future version of Ant.
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If you ve ever felt the pain of dealing with the enormous amount of support code for an EJB project you will likely find XDoclet s EJB support invaluable. In chapter 11, we explored XDoclet s @todo and templating capabilities, but it really shines with EJB. The goal of XDoclet s EJB support is to enable developers to write Enterprise JavaBeans without ever having to write a deployment descriptor or remote interface. Instead, you just code the bean implementation, mark it up with a few custom Javadoc tags, and have all the support structures generated for you. Returning to our stateless session search bean, figure 14.2 demonstrates the use of two simple @tags to generate of all the needed EJB support components. The classlevel @ejb.bean type="Stateless" marks the class as a stateless session bean, rather than as stateful. Both methods that we want to expose to our remote clients get flagged with an @ejb.interface-method tag. Using an optional view-type attribute on the @ejb.interface allows the method to be exposed as a remote or local (EJB 2.0) interface, or both, giving great control over such details. This example only demonstrates a session bean, but XDoclet also generates entity bean-specific code such as primary key classes and data access objects. The utility methods generated consist of helper getHome methods to return the home interface from the InitialContext. This Ant code generated all the files shown in figure 14.2:
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/** * @ejb:bean type="Stateless" */ public class SearchSessionBean implements SessionBean { // ... /** * @ejb:interface-method */ public Document[] search(String query) throws SearchException { return SearchUtil.findDocuments(query); } /** * @ejb:interface-method */ public void init(String indexDir) throws SearchException { SearchUtil.init(indexDir); }
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Remote or local interface
Home interface (local and remote)
Lookup utility methods
ejb-jar.xml
Vendorspecific metadata
Figure 14.2 The classes and XML files that <ejbdoclet> can create from @ejb tags
<ejbdoclet sourcepath="src" destdir="${build.dir}" classpathref="xdoclet.classpath" excludedtags="@version,@author" ejbspec="1.1"> <fileset dir="src"> <include name="**/*Bean.java" /> </fileset> <remoteinterface/> <homeinterface/> <utilobject/> <deploymentdescriptor destdir="${build.dir}/ejb/META-INF"/> <jboss/> </ejbdoclet>
The ejbspec attribute tells XDoclet to do the right things code and deployment descriptor generation-wise for the desired EJB specification (1.1 or 2.0). While migrating from one container version to another is not likely to be headache-free, XDoclet performs a lot of the work for you. 14.5.1 XDoclet subtasks Because of the variability in deployment descriptors between various EJB containers as well as the sheer volume of architectural options with EJB in general, XDoclet has many configuration possibilities. The <ejbdoclet> usage shown in section 14.5 illustrates the build-file writer s control over what artifacts are generated. In that example, the generation includes remote interfaces, home interfaces, utility objects, standard EJB deployment descriptor, and vendor-specific JBoss deployment descriptors. 341
USING XDOCLET FOR EJB DEVELOPMENT
Nested within the <ejbdoclet> Ant task are subtasks, the XDoclet term for nested elements in its Ant tasks. Table 14.2 shows the available subtasks for the <ejbdoclet> task. We cover vendor-specific subtasks in section 14.5.3.
Table 14.2 Subtask <dao> <dataobject> <deploymentdescriptor> <entitybmp> <entitycmp> <entitypk> <homeinterface> <localhomeinterface> <localinterface> <remoteinterface> <session> <utilobject> <valueobject> <ejbdoclet> subtasks Artifacts Generated Abstract data access object interfaces EJB data objects EJB standard-compliant deployment descriptor, ejb-jar.xml Entity bean BMP classes derived from the abstract entity bean classes Entity bean CMP classes derived from the abstract entity bean classes Primary key classes Home interfaces Local (EJB 2.0) home interfaces Local (EJB 2.0) interfaces Remote interfaces Session bean classes derived from the abstract session bean classes Utility objects for local/home interface lookups Value object classes
The <template> (discussed in chapter 11) and <xmlTemplate> subtasks are also valid subtasks for <ejbdoclet>, which allows custom XDoclet templating to occur in the same sweep of the source code that EJB generation uses. Each subtask has its own share of attributes, and there are standard attributes that all subtasks share. Each subtask can override the destdir, mergedir, and templatefile for added control over output location and merge files, and to override the XDoclet template used. There are many other options to the subtasks; consult the excellent XDoclet documentation for the details. 14.5.2 XDoclet s @tags The power of XDoclet comes from the metadata stored in the @tags. Another major piece of information that is gathered from source code analyzed by XDoclet is the class structure, specifically the inheritance hierarchy, interfaces implemented, and the method names and signatures. XDoclet uses many EJB-specific @tags to define metadata and to control the generation process. From XDoclet s documentation, here is a typical example of a class-level entity bean Javadoc block:
/** * This is an account bean. It is an example of how to use the * EJBDoclet tags. * * @see Customer Accounts are owned by customers, and a customer can * have many accounts.
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