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The code of an advice code block can contain any valid Java instruction, such as a method call, a variable assignment, an object creation (using new), a loop (using for, while, or do/while), a test (using if), and an exception-handling block (using try/catch). Two additional instructions, proceed and thisJoinPoint, are also valid in AspectJ. These instructions are used exclusively for advice code; in any other context, they generate compiler errors. The proceed keyword executes the joinpoint and can be used only in around advice code. The thisJoinPoint keyword can be used for any kind of advice code. As mentioned previously, thisJoinPoint is a reference to an object that describes the current joinpoint.

Checks for if ( error ) necessary { rollback mdbContext.setRollBackOnly(); previousMessages.put( msgId, new Integer(++count) );

The persistence context plays a vital role in the internal functionality of the EntityManager Although we perform persistence operations by invoking methods on the EntityManager, the EntityManager itself does not directly keep track of the lifecycle of an individual entity In reality, the EntityManager delegates the task of managing entity state to the currently available persistence context In a very simple sense, a persistence context is a self-contained collection of entities managed by an EntityManager during a given persistence scope The persistence scope is the duration of time a given set of entities remains managed The best way to understand this is to start by examining what the various persistence scopes are and what they do and then backtracking to the meaning of the term We ll explain how the persistence context and persistence scope relates to the EntityManager by first exploring what the persistence context is.

There are two different types of persistence scopes: transaction and extended Transaction-scoped EntityManager An EntityManager associated with a transaction-scoped persistence context is known as a transaction-scoped EntityManager If a persistence context is under transaction scope, entities attached during a transaction are automatically detached when the transaction ends (All persistence operations that may result in data changes must be performed inside a transaction, no matter what the persistence scope is) In other words, the persistence context keeps managing entities while the transaction it is enclosed by is active Once the persistence context detects that a transaction has either been rolled back or committed, it will detach all managed entities after making sure that all data changes until that point are synchronized with the database Figure 93 depicts this relationship between entities, the transaction persistence scope, and persistence contexts.

} else { if( previousMessages.containsKey( msgId ) ) previousMessages.remove( msgId ); } }

Extended EntityManager The life span of the extended EntityManager lasts across multiple transactions An extended EntityManager can only be used with stateful session beans and lasts as long as the bean instance is alive Therefore, in persistence contexts with extended scope, how long entities remain managed has nothing to do with transaction.

AspectJ defines five types of advice code. Of these five, before, after, and around are the more-commonly encountered ones. The last two types, after returning and after throwing, can be seen as refinements of the after type.

Figure 9.3 Transaction-scoped persistence contexts only keep entities attached within the boundaries of the enclosing transaction.