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logger.entering(ic.getTarget().toString(), ic.getMethod().getName()); try { return ic.proceed(); } finally { logger.exiting(ic.getTarget().toString(), ic.getMethod().getName()); } } } The LoggingInterceptor can now be wrapped transparently by any EJB interested in this interceptor. To do this, the bean needs to inform the container with a @javax.interceptor. Interceptors annotation. In Listing 8-5, the annotation is set on the createCustomer() method. This means that any invocation of this method will be intercepted by the container, and the LoggingInterceptor class will be invoked (logging a message on entry and exit of the method). Listing 8-5. CustomerEJB Uses an Interceptor on One Method @Stateless public class CustomerEJB { @PersistenceContext(unitName = "chapter08PU") private EntityManager em; @Interceptors(LoggingInterceptor.class) public void createCustomer(Customer customer) { em.persist(customer); } public Customer findCustomerById(Long id) { return em.find(Customer.class, id); } } In Listing 8-5, @Interceptors is only attached to the createCustomer() method. This means that if a client invokes findCustomerById(), the container will not intercept the call. If you want the calls to both methods to be intercepted, you can add the @Interceptors annotation either on both methods or on the bean itself. When you do so, the interceptor is triggered if either method is invoked: @Stateless @Interceptors(LoggingInterceptor.class) public class CustomerEJB { public void createCustomer(Customer customer) { ... } public Customer findCustomerById(Long id) { ... } } If your bean has several methods, and you want to apply an interceptor to the entire bean except for a specific method, you can use the javax.interceptor.ExcludeClassInterceptors

When extracting files, you can retrieve all files in the tar file, or you can provide a list of specific files to be retrieved. The following example extracts only two files from the tar file: $ tar -xvf mytar.tar script1.sql script2.sql You can also use pattern matching to retrieve files from a tar file. This example extracts all files that end in *.bsh from the tar file named mytar.tar: $ tar -xvf mytar.tar *.bsh If you don t specify any files to be extracted, then all files are retrieved: $ tar -xvf mytar.tar

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The button presses have all been set to call the buttonPressed: action method. In the implementation of the buttonPressed: method, use the tag number that you previously set to a unique number for each button, and you are using that property to determine which button was pressed. To add the job to the operation queue, send yourself the addOp: message with the appropriate job as the single parameter. The addition of each operation to the operation queue is enclosed in a @try @catch block. If there is an error, an alert is presented with the reason. Don t forget to release the operations and the queue in the dealloc method as follows:

the table name defaults to BOOK_TAGS (a concatenation of the name of the containing entity and the name of the collection attribute, separated by an underscore) instead of TAG as specified in the name element (name = "Tag"). Notice that I ve added a complementary @Column annotation to rename the column to VALUE. The result is shown in Figure 3-3.

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