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While entities tell a JPA provider how they map to the database, they do not persist themselves The EntityManager interface reads the ORM metadata for an entity and performs persistence operations The EntityManager knows how to add entities to the database, update stored entities, and delete and retrieve entities from the database In addition, the JPA provides the ability to handle lifecycle management, performance tuning, caching, and transaction management..

public interface javax.ejb.Timer { public void cancel(); public long getTimeRemaining(); public java.util.Date getNextTimeout(); public javax.ejb.TimerHandle getHandle();

Message queues guarantee that only one consumer will process each single message. By limiting the number of consumers assigned to a queue to a single messagedriven bean, you ensure that all the messages will be processed in the order in which they were received. In addition, using one consumer guarantees that each message will completely process before the next one begins processing. Otherwise, you can create a pool of message-driven beans (by increasing the pool size in a vendor-specific manner) to pull messages faster from the queue. Messages will still only be delivered to a single message-driven bean instance, but using many messagedriven bean instances with the same queue results in faster message processing.

3. The proceed method is called. 4. The corresponding joinpoint is executed. 5. The after part is executed. 6. Program execution resuming, just after the joinpoint. The call to proceed is optional. Certainly, it is valid for around advice code to not call proceed. In such a case, the code associated with the joinpoint is not executed. After the execution of the advice code, the program execution resumes directly after the joinpoint. Advice code can call proceed in some cases and not in others. This can be seen in the case of a security aspect that controls access to a method. If the user is authenticated, the call is authorized and the aspect calls proceed. If the user does not own sufficient rights, the call is rejected and the security aspect does not call proceed. In such a case, the joinpoint is not executed. The before and after advice code blocks do not need to call proceed. They are designed to be executed before and after joinpoints. AspectJ raises an error if proceed appears in the body of before or after advice code.

public java.io.Serializable getInfo(); }

The cancel method is particularly useful in canceling a timer prior to its expiration. You can use this method to stop timers prematurely. In our bid-monitoring example, we can use this method to stop the chain of recurring callbacks when bidding on the item is over. It is vital to invoke the cancel method for recurring Timers when they are no longer needed. Otherwise, the EJB will spin in an infinite loop unnecessarily. This is a subtle, common, and easy mistake to make. The getTimeRemaining method can be used on either a single-use or interval timer. The return value of this method indicates the remaining time for the timer to expire, in milliseconds. You might find that this method is rarely used. The getNextTimeout method indicates the next time a recurring Timer will time out, as a java.util.Date instead of a long time offset. Similar to the getTimeRemaining method, this method is useful in the rare instance that you might need to determine whether to cancel a Timer based on when it will fire next. The getHandle method returns a Timer handle. javax.ejb.TimerHandle is a serialized object that you can store and then use to obtain information about the Timer (by using the getTimer method available through TimerHandle). This is a relatively obscure method that we ll leave for you to explore on your own if you want to. You have already seen the getInfo method in action. This method is extremely useful in writing nontrivial timeout functions and accessing extra processing information attached to the Timer by the bean method creating the Timer. Let s now discuss situations where EJB Timers are an appropriate fit.

Recipe 1.6 illustrates a good way to store a reference to an existing EJB. However, that ability does a client little good if it doesn t know how to retrieve that reference. Retrieving a stored Handle object lets you circumvent the JNDI lookup of the EJB instance. To retrieve a stored EJB handle, you have to deserialize it from its stored location.