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Several static code blocks can be associated with a single class. In such a case, the order they are executed in corresponds to the order of their definition. The staticinitialization joinpoints correspond to the executions of these static blocks. With staticinitialization, advice code can be executed before and after a static block. For instance, the following expression intercepts the execution of all static blocks that are defined in the Catalog class: staticinitialization( Catalog ) As for other pointcut descriptors, class names can be associated with package names and wildcards. Advice-Code Execution The last existing variety of AspectJ joinpoint, adviceexecution, corresponds, as its name suggests, to the execution of advice code. Therefore, you can define an aspect that modifies the execution of another aspect. However, the adviceexecution type should be used with caution. If it is used carelessly, there is a high risk of obtaining endless loops during the execution of the application. All the joinpoint types we have previously presented accept an expression as a parameter; this is not the case for adviceexecution. This joinpoint occurs when advice code, including advice code that will be associated with the joinpoint itself, is executed. Consider the following pointcut descriptor and advice code: pointcut aa(): adviceexecution(); Object before(): aa() { ... } Before each execution of an advice code block, the aa pointcut launches the advice code that is given in the example. However, this advice code does not differ from any others its execution triggers the occurrence of the pointcut, then the execution of the advice code, and so on. To avoid this endless loop, the adviceexecution type must be used with the filtering operators that the next section presents.

Hence the entity instance is not managed yet. It will become managed if the EntityManager s persist method creates a new record in the database corresponding to the entity. This would be the most natural way to attach the Bid entity in the previous snippet to the EntityManager s context:

manager.persist(bid);

<weblogic-ejb-jar> <weblogic-enterprise-bean> Sets up the message<ejb-name>concurrentMDB</ejb-name> driven bean pool <message-driven-descriptor> <pool> <max-beans-in-free-pool>5</max-beans-in-free-pool> <initial-beans-in-free-pool>2</initial-beans-in-free-pool> </pool> <destination-jndi-name>BookJMSQueue</destination-jndi-name> </message-driven-descriptor> <jndi-name>concurrent.MBD</jndi-name> </weblogic-enterprise-bean> </weblogic-ejb-jar>

A managed entity becomes detached when it is out of scope, removed, serialized, or cloned. For example, the instance of the Bid entity will become detached when the underlying transaction commits. Unlike entities explicitly created using the new operator, an entity retrieved from the database using the EntityManager s find method or a query is attached if retrieved within a transactional context. A retrieved instance of the entity becomes detached immediately if there is no associated transaction. The merge and refresh methods are intended for entities that have been retrieved from the database and are in the detached state. Either of these methods attaches entities to the entity manager. EntityManager.merge updates the database with the data held in the entity, and refresh does the opposite it resets the entity s state with data from the database. We ll discuss these methods in much greater detail in section 9.3. Detached entities A detached entity is an entity that is no longer managed by the EntityManager and there is no guarantee that the state of the entity is in synch with the database. Detachment and merge operations become handy when you want to pass an entity across application tiers. For example, you can detach an entity and pass it

The joinpoints presented previously offer a rich syntax and can be used to define many different pointcut descriptors. You will learn in this section that they can also be combined with logical operators and that filtering operators allow you to restrict the set of caught joinpoints. Logical Operations Each defined pointcut descriptor can be compared to a Boolean function. For a given joinpoint, if the pointcut applies, the function returns true; if it does not apply, the function returns false. With this logical reasoning in mind, the use of the Boolean operations AND, OR, and NOT is intuitive. They correspond to the conjunction, disjunction, and negation of the occurrence of a joinpoint, respectively. AspectJ supports these three operations with their Java syntax: && for AND, || for OR, and ! for NOT.

to the web tier, then update it and send it back to the EJB tier, where you can merge the detached entity to the persistence context The usual way entities become detached is a little subtler Essentially, an attached entity becomes detached as soon as it goes out of the EntityManager context s scope Think of this as the expiration of the invisible link between an entity and the EntityManager at the end of a logical unit of work or a session An EntityManager session could be limited to a single method call or span an arbitrary length of time (Reminds you of session beans, doesn t it As you ll soon see, this is not entirely an accident.