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This is our base class for both Customers and Employees. It defines the discriminator column we ve just seen as "DISCRIMINATOR", where Person rows will have a value of "PERSON". Since one table is representing the entire class hierarchy, the persistence provider needs some way to identify which class the row in the database maps to. It determines this by reading the value from the discriminator column. The @javax.persistence.DiscriminatorColumn annotation identifies which column in our table will store the discriminator s value. The name() attribute identifies the name of the column, and the discriminatorType() attribute specifies what type the discriminator column will be. It can be a STRING, CHAR, or INTEGER. For our Employee class hierarchy mapping, you do not have to specify the discriminatorType(), as it defaults to being a STRING. If you re OK with the default column name, you can remove the @Discrimina torColumn entirely:

Configuring Directory Service Objects for Auditing If you have specified the Audit Directory Service Access event category for auditing, you can audit user access to Active Directory objects. To configure an Active Directory object for auditing, complete the following steps: 1. Click Start, point to Administrative Tools, and then click Active Directory Users And Computers. In the Active Directory Users And Computers console, click View, and then click Advanced Features. 2. Select the object that you want to audit, click Properties on the Action menu, click the Security tab, and then click Advanced. 3. In the Advanced Security Settings For dialog box for the object, in the Auditing tab, click Add, select the users or groups for whom you want to audit Active Direc tory object access, and then click OK. 4. In the Auditing Entry For dialog box for the object, shown in Figure 13-11, select the Successful check box, the Failed check box, or both check boxes for the events that you want to audit.

Although other organizations dispute these exact figures citing difficulties in estimating the spread of infection as well as the costs of cleanup these attacks clearly have a tremendous negative economic impact.

Table 13-3 describes some of the audit events for Active Directory objects and explains what action triggers each event to occur.

package javax.persistence; @Target(TYPE) @Retention(RUNTIME) public @interface DiscriminatorColumn { String name( ) default "DTYPE"; DiscriminatorType discriminatorType( ) default STRING; String columnDefinition( ) default ""; int length( ) default 10; }

Follow these guidelines to manage legal requirements:

13-37

Table 13-3 Some Active Directory Object Events and What Triggers Them (Continued)

Have the organization s legal team review each security design. Improve the security design team s awareness of current legal requirements. Require the security design team to prepare legal compliance as part of its design. Have a frank discussion with IT-knowledgeable attorneys early in each product or process development cycle.

The @javax.persistence.DiscriminatorValue annotation defines what value the discriminator column will take for rows that store an instance of a Person class. You can leave this attribute undefined if you want to. In that case, the persistence manager would generate a value for you automatically. This value will be vendor-specific if the DiscriminatorType is CHAR or INTEGER. The entity name is used by default when a type of STRING is specified. It is good practice to specify the value for CHAR and INTEGER values:

Event Read All Properties Write All Properties Create All Child Objects Delete All Child Objects Read Permissions Modify Permissions Modify Owner

1-10

User Activity That Triggers the Event Viewing any attribute of the audited object Changing any attribute of the audited object Creating any object within the audited object Deleting any object within the audited object Viewing the permissions for the audited object Changing the permissions for the audited object Taking ownership of the audited object

1