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By default, a unique instance of an aspect is created when the application is launched. The aspect is then said to be a singleton. The same aspect instance is shared by all the application objects. In special cases, it can be useful to create several instances of a given aspect. Different application objects are then aspectized by the different instances. For example, this feature can be used to dedicate different pieces of data to each part of the application. The three following cases can occur: The aspect is a singleton, and only one instance of the aspect exists at run time. This is the default case. The aspect is instantiated several times, and the instances are associated with different application objects. The aspect is instantiated several times, and the instances are associated with different control-flow sequences of the application. No keyword exists for the first case because this is the default behavior when the aspect keyword is used. For the second case, two keywords are available: perthis and pertarget. The aspects can then be written as follows: aspect <name> perthis( <poincut> ) { ... } aspect <name> pertarget( <poincut> ) { ... } When perthis is used, an instance of the aspect is created for every object that is an executing object of the given pointcut. The other objects (those that are not executing objects of the pointcut) are not aspectized. When pertarget is used, an instance of the aspect is created for every object that is the target object of the given pointcut. For the third case, two keywords are available: percflow and percflowbelow. The aspects can then be written as follows:

Table 7.2 Domain relation types and corresponding annotations Annotation @OneToOne @OneToMany @ManyToOne @ManyToMany

The @OneToOne annotation is used to mark uni- and bidirectional one-to-one relationships. Although in most systems one-to-one relationships are rare, they make perfect sense for domain modeling. In fact, our ActionBazaar example in figure 7.3 has no one-to-one relationship. However, we can imagine that the User domain object parent to both Seller and Bidder has a one-to-one relationship with a BillingInfo object. The BillingInfo object might contain billing data on a user s credit card, bank account, and so on. Let s start by seeing what a unidirectional relationship would look like. Unidirectional one-to-one For the time, being, let s assume that the User object has a reference to the BillingInfo but not vice versa. In other words, the relationship is unidirectional, as shown in figure 7.5.

To map the READ_ONLY role to the correct method permissions (only allowing use of the getter methods), use the following:

Figure 7.5 A one-to-one relationship between the User and BillingInfo entities. A User may have at most one instance of the BillingInfo object and the BillingInfo object cannot exist without a User.

aspect <name> percflow( <poincut> ) { ... } aspect <name> perclfowbelow( <poincut> ) { ... } When percflow is used, an aspect instance is created each time the application enters the control-flow sequence that is designated by the pointcut. As for the cflow operator in pointcut definitions, the joinpoints belongs to the control flow. When percflowbelow is used, an aspect instance is created each time the application enters the control-flow sequence that is designated by the pointcut, but the joinpoints are not included in the control flow. The static aspectOf method is defined for each aspect and returns the aspect instance that is currently in use. For example, in the singleton TraceAspect aspect, the call TraceAspect. aspectOf() returns the reference to the singleton. For the perthis and pertarget types, a parameter must be passed when aspectOf is called; this parameter gives the source or the target object that is associated with the requested instance. For the percflow and percflowbelow types, no parameters are needed. The method returns the aspect instance or null, depending on whether the current run is included in the control-flow sequences that are defined for the aspects.

@Entity public class User { @Id protected String userId; protected String email; One-to-one relationship between @OneToOne User and BillingInfo protected BillingInfo billingInfo; }

<method-permission> <role-name> READ_ONLY </role-name> <method> <ejb-name>EmployeeBean</ejb-name> <method-name>getFirstName</method-name> </method> <method> <ejb-name>EmployeeBean</ejb-name> <method-name>getLastName</method-name> </method> </method-permission>

@Entity public class BillingInfo { @Id protected Long billingId; protected String creditCardType; protected String creditCardNumber; protected String nameOnCreditCard; protected Date creditCardExpiration; protected String bankAccountNumber; protected String bankName; protected String routingNumber; }

In listing 7.5, the User class holds a BillingInfo reference in the persisted billingInfo field. Since the billingInfo variable holds only one instance of the BillingInfo class, the relationship is one-to-one. The @OneToOne annotation indicates that the persistence provider should maintain this relationship in the database b. Let s take a closer look at the definition of the @OneToOne annotation to better understand its features: