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From an OO perspective, it would make sense for the database tables storing this data to mirror the Java implementation in listing 8.1. In this scheme, two different tables, USERS and BILLING_INFO, would have to be created, with the billing object reference in the User object b translated into a foreign key to the BILLING_ INFO table s key in the USERS table (perhaps called BILLING_ID). The problem is

If JAC was installed in the c:\jac directory, and all the application files were in the src directory, you would run the Java compiler with the following command: javac -d classes -classpath c:\jac\jac.jar src\*.java The resulting .class files would then be stored in the classes directory.

that this scheme does not make complete sense in the relational world. As a matter of fact, since the objects are merely expressing a one-to-one relationship, normalization would dictate that the USERS and BILLING_INFO tables be merged into one. This would eliminate the almost pointless BILLING_INFO table and the redundant foreign key in the USERS table. The extended USERS table could look like this:

Invoking testMethod() produces the following output based on the appender setup for the logger ejb.session:

USER_ID EMAIL CREDIT_CARD_TYPE CREDIT_CARD_NUMBER NAME_ON_CREDIT_CARD CREDIT_CARD_EXPIRATION BANK_ACCOUNT_NUMBER BANK_NAME ROUTING_NUMBER NOT NULL, PRIMARY KEY NOT NULL NUMBER VARCHAR2(255) VARCHAR2(255) VARCHAR2(255) VARCHAR2(255) DATE VARCHAR2(255) VARCHAR2(255) VARCHAR2(255)

In effect, our persistence layer mapping code would have to resolve this difference by pulling field data out of both the USERS and related BILLING_INFO tables and storing it into the columns of the combined USERS table. A bad approach, but an all-too-common one, would be to compromise your domain model to make it fit the relational data model (get rid of the separate BillingInfo object). While this would certainly make the mapping code simpler, you would lose out on a sensible domain model. In addition, you would write awkward code for the parts of your application that deal only with the BillingInfo object and not the User object. If you remember our discussion in chapter 7, then you probably realize that BillingInfo may make sense as an embedded object since you do not want to have a separate identity, and want to store the data in the USERS table. One-to-many relationships The relational primary-key/foreign-key mechanism is ideally suited for a parentchild one-to-many relationship between tables. Let s take the probable relationship between the ITEMS and BIDS tables, for example. The tables will probably look like those shown in listing 8.2.

An aspect-oriented application with JAC can be run by launching the framework with an application-descriptor file. The jac.jar library contains all the classes that are needed to launch the framework. To run the order-management application, the command is as follows: java -jar c:\jac\jac.jar -R c:\jac -C src;classes customer.jac The -R option indicates the JAC installation directory (c:\jac in our example). The -C option specifies the path-like structure (here, the src and classes directories) that JAC can load files from. The last parameter in the command line is the name of the application-descriptor file.

Use Ant properties in your XDoclet tags. Examine listing 2.12, which contains a subsection from a build.xml file. This subsection defines a property and the <ejbdoclet/> task.

ITEMS ITEM_ID TITLE DESCRIPTION INITIAL_PRICE BID_START_DATE BID_END_DATE NOT NOT NOT NOT NOT NOT NULL, PRIMARY KEY NULL NULL NULL NULL NULL NUMBER VARCHAR2(255) CLOB NUMBER TIMESTAMP TIMESTAMP

NOT NULL, NUMBER FOREIGN KEY (USERS(USER_ID))

<target name="ejbdoclet" depends="init"> <taskdef name="ejbdoclet" classname="xdoclet.modules.ejb.EjbDocletTask"> <classpath> <fileset dir="${xdoclet.lib.dir}" includes="*.jar"/> </classpath> </taskdef> <ejbdoclet destdir="${src}" ejbspec="2.0" >

NOT NULL, PRIMARY KEY NUMBER NOT NULL NUMBER NOT NULL TIMESTAMP NOT NULL, NUMBER FOREIGN KEY (USER(USER_ID)) NOT NULL, NUMBER FOREIGN KEY (ITEMS(ITEM_ID))

The previous command gives the output that is shown in Listing 4-5. Listing 4-5. The Output of the Order-Management Application JAC version 0.12.1 --- Launching Application Order management ----- configuring traceid aspect ---> Before addItem 2 item(s) CD added to the order -> After addItem -> Before addItem 1 item(s) DVD added to the order -> After addItem Order amount: US$50.0 JAC system shutdown: notifying all ACs... Bye bye. The first three lines of Listing 4-5 are automatically displayed by JAC. They contain a welcome message with the JAC version number, the name of the application that was launched, and a line for each woven aspect. The output of the application follows, showing each execution of the addItem method, which is wrapped by a message. The last two lines of output are displayed by JAC.