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Using a bean pool is a quick and dirty way to achieve concurrent processing of messages. The pool, combined with a message queue, provides a way to process many messages at once without duplicating messages across instances. Creating an environment like this allows messages to start processing instead of waiting for previous messages to complete. You should use this type of processing only when

) For an EntityManager whose session is limited to a method call, all entities attached to it become detached as soon as a method returns, even if the entity objects are used outside the method If this is not absolutely crystal clear right now, it will be once we talk about the EntityManager persistence context in the next section Entity instances also become detached through cloning or serialization This is because the EntityManager quite literally keeps track of entities through Java object references Since cloned or serialized instances don t have the same object references as the original managed entity, the EntityManager has no way of knowing they exist This scenario occurs most often in situations where entities are sent across the network for session bean remote method calls In addition, if you call the clear method of EntityManager, it forces all entities in the persistence context to be detached.

Calling the EntityManager s remove method will also detach an entity This makes perfect sense since this method removes the data associated with the entity from the database As far as the EntityManager is concerned, the entity no longer exists, so there is no need to continue managing it For our Bid entity, this would be an apt demise :.

concurrent processing of messages will not cause problems in your business logic or invalid states in your data.

The following expression encompasses the executions of the computeAmount method and of the getPrice method: execution( * OrdercomputeAmount(.) ) || execution( * CataloggetPrice(.) ) The evaluation of a pointcut descriptor is computed for every existing joinpoint A given joinpoint can be either the execution of computeAmount or the execution of getPrice but never both at the same time Consequently, the use of && instead of || in the previous pointcut descriptor will not intercept any joinpoint The use of && instead of || in a pointcut descriptor is a frequent mistake However, since the syntax of the expression is correct, the AspectJ compiler does not report an error.

manager.remove(bid);

We ll return to this discussion on detachment and merge operations in section 9.3.3. A good way to remember the entity lifecycle is through a convenient analogy. Think of an entity as an aircraft and the EntityManager as the air traffic controller. While the aircraft is outside the range of the airport (detached or new), it is not guided by the air traffic controller. However, when it does come into range (managed), the traffic controller manages the aircraft s movement (state synchronized with database). Eventually, a grounded aircraft is guided into takeoff and goes out of airport range again (detached), at which point the pilot is free to follow her own flight plan (modifying a detached entity without state being managed).

Message-driven beans that subscribe to a topic or receive messages from a queue should be able to handle messages of the wrong type (which should not invoke the message-driven business logic). Beans should just politely discard these messages when they are encountered. This is especially true for message-driven beans that exist in an environment with many different beans that watch a single source for incoming messages. However, it would be more efficient to avoid the execution time used for discarding messages and instead avoid receiving unwanted messages.