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As illustrated by the previous definition, the notions of the pointcut and the joinpoint are linked A pointcut is defined by a set of joinpoints and, conversely, a set of joinpoints define a specific pointcut However, note that the natures of these two notions are somewhat different Joinpoints are well-defined run-time entities (they occur in the control flow of a program), whereas pointcuts cannot be attached to a particular structure or time slot of the running program Instead, pointcuts are to be seen as structural code elements that participate in the definition of an aspect As illustrated in the following chapters, a language for defining pointcuts is included in every existing aspect-oriented tool Although each tool defines its own syntax, the principles remain the same.

CREATE TABLE SEQUENCE_GENERATOR_TABLE (SEQUENCE_NAME VARCHAR2(80) NOT NULL, SEQUENCE_VALUE NUMBER(15) NOT NULL, PRIMARY KEY (SEQUENCE_NAME));

In most EJB applications, completing business logic in one EJB involves invoking another EJB. In addition, entity bean access is usually through a session bean facade. With most cases, EJB access from another EJB takes place in the same EJB container. However, large enterprise applications may separate business logic across hosts, or may invoke other EJB applications to complete a workflow. In these cases, you might need to access remote EJBs from other EJBs. For this solution, you need to know how to create an initial context for finding a remote EJB container in order to look up or create remote EJBs.

The SEQUENCE_NAME column is meant to store the name of a sequence, and the SEQUENCE_VALUE column is meant to store the current value of the sequence. The next step is to prepare the table for use by inserting the initial value manually as follows:

INSERT INTO SEQUENCE_GENERATOR_TABLE (SEQUENCE_NAME, SEQUENCE_VALUE) VALUES ('USER_SEQUENCE', 1);

Generating EJB interfaces Adding JNDI names to your home interfaces Maintaining the XML descriptor Creating value objects for entity beans Creating primary key classes Customizing XDoclet tags with Ant properties Generating a utility object Adding security roles to the bean source Creating method permission XML Generating finder methods Creating the XML for ejbSelect methods Adding home methods to home interfaces

The ultimate goal of a pointcut language is to provide a simple and flexible way to query the joinpoints about a given program s structure so an aspect can be applied to the joinpoints Typically, the language is a kind of pattern language with quantification operators, wildcard symbols (such as *), and Boolean operators Keywords are also included for designating joinpoint types..

In a sense, these two steps combined are the equivalent of creating the Oracle sequence in the second strategy. Despite the obvious complexity of this approach, one advantage is that the same sequence table can be used for multiple sequences in the application. We are now prepared to create the TableGenerator utilizing the table:

@TableGenerator (name="USER_TABLE_GENERATOR", table="SEQUENCE_GENERATOR_TABLE", pkColumnName="SEQUENCE_NAME", valueColumnName="SEQUENCE_VALUE", pkColumnValue="USER_SEQUENCE")

XDoclet requires the use of Ant, a build tool from Apache, which you can find at http://ant.apache.org. This chapter assumes that you have a working knowledge of Ant, including writing build.xml files for compiling and packaging your EJB files. If you have not used Ant for a build system, you can find specific recipes for those tasks in chapter 9. Specifically, XDoclet relies on the Ant task <ejbdoclet/>. Once inserted into the build.xml, the <ejbdoclet/> task allows you to specify subtasks for file generation, method construction, and more. Tasks execute a section of code within Ant. Ant contains many predefined tasks for such jobs as generating documentation and compiling, but it lets you build your own tasks as well. In fact, the <ejbdoclet/> task is a custom task that executes certain code in the XDoclet library. For this book, we used XDoclet beta version 1.2. Table 2.1 lists the JAR file dependencies needed by this version of XDoclet, as well as the URL for their download. The JAR files listed in table 2.1 must be in the classpath of the <ejbdoclet/> task added to your build.xml file before you execute the <ejbdoclet/> Ant task. (Some of the JAR files will not be needed if you don t use certain features of the 1.2 version of XDoclet.)