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An aspect that introduces fields, methods, or constructors in a class performs a declaration on behalf of this class. This declaration follows the same rules as a regular Java declaration. The name of the field or method is preceded by the name of the class that the introduction is to be performed in. Constructors are designated with the new keyword. The aspect in Listing 3-13 introduces the date field, two methods named getDate and setDate, and a constructor in the Order class. Listing 3-13. Intertype Declaration import java.util.Date; public aspect AddDate { private Date Order.date; public Date Order.getDate() { return date; } public void Order.setDate(Date date) { this.date=date; }

public boolean equals (Object other) { if (other instanceof Category) { return this.name.equals(((Category)other).name) } else { return false; } }

else throw new NotAdminException(); }

In this case, we would be assuming that the name instance variable uniquely identifies a Category. The name field therefore is the identity for the Category object. In listing 7.1, however, we choose the id field as the identity for Category. This choice will be more obvious when we talk about mapping the Category object into a database table. As you ll see, in effect, we choose this instance variable because we get it free from the database as a unique Category identifier, and it is less resource intensive than comparing the java.lang.String name field since it is a numeric java. lang.Long. Another benefit of using the numeric type key is automatic generation. There are several ways of telling the persistence provider where

the identity of an entity is stored. Starting with the simplest and ending with the most complex, these are as follows:

public Order.new(Date date) { this.date=date; } after(): initialization(Order.new(..)) { Order myOrder = (Order) thisJoinPoint.getTarget(); myOrder.date = new Date(); } } In the AddDate aspect in Listing 3-13, after advice code is defined after the instantiations of the Order class. This advice code collects the references of the instantiated orders and sets the current date to the introduced date field. Although these introductions are simplistic, they should be dealt with cautiously. Accordingly, the elements defined in the application must not conflict with the elements introduced by the aspect. For instance, if a date field already exists in the Order class, a compiler error occurs. AspectJ does not provide an option to check whether a field or method name already exists before it performs the introduction. The existence of conflicting elements is revealed only during compile time when the error occurs. Therefore, it is up to you to manually correct the program or the aspect when this occurs.

This example allows clients within the role ADMIN to perform the important function. Clients in other roles will cause a NotAdminException to be thrown if they try to invoke the method.

Let s look at each of these mechanisms next. The @Id annotation Using the javax.persistence.Id annotations is the simplest way of telling the persistence provider where the entity identity is stored. The @Id annotation marks a field or property as identity for an entity. Since we are using property-based persistence for the Category entity, we could let the API know that we are using the id property as the identity by applying the @Id annotation to the getId method as in the following code snippet. In the case of field-based persistence, the @Id annotation would have been applied directly to an instance variable instead.

@Entity public class Category { ... protected Long id; ... @Id public Long getId() { return this.id; } public void setId(Long id) { this.id = id; } ... }

2.9 Specifying security roles in the bean source 7.1 Finding the identity and role of the caller inside an EJB method 7.3 Passing client credentials to the EJB container 7.4 Disabling methods for certain users

Because the identity we specify will end up in a database primary key column, there are limitations to what data types an identity might have. EJB 3 supports primitives, primitive wrappers, and Serializable types like java.lang.String, java. util.Date, and java.sql.Date as identities. In addition, when choosing numeric types you should avoid types such as float, Float, double, and so forth because of the indeterminate nature of type precision. For example, let s assume that we are using float data as the identity, and specify 103.789 and 103.787 as the identity values for two separate entity instances. If the database rounds these values to two-digit decimal precision before storing the record, both of these values would