Download Beginning EJB 3, 2nd Edition: Java EE 7 Edition by Jonathan Wetherbee, Chirag Rathod, Raghu Kodali, Peter PDF

köp Sildenafil Citrate Östersund (Frösön Air Base) By Jonathan Wetherbee, Chirag Rathod, Raghu Kodali, Peter Zadrozny Enhance strong, standards-based, back-end enterprise common sense with starting EJB three, Java EE 7 version. Led by means of an writer crew with twenty years of mixed firm JavaBeans adventure, you are going to how you can use the hot EJB 3.2 APIs. you will achieve the data and abilities you have to to create the complicated company functions that run modern transactions and extra. exact at Java and Java EE builders, with and with no past EJB adventure, starting EJB three is choked with functional insights, method advice, and code examples. As every one bankruptcy unfolds, you will not just discover a brand new sector of the spec; you will additionally see how one can use it on your personal functions via particular examples. Show description

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Info Chapter 2 ■ EJB Session Beans There are two ways to define an interceptor. You can either add an @AroundInvoke annotation on a particular method, or you can annotate the bean class to designate an interceptor class that will interpose on all (or an explicit subset of ) methods on the bean class. An interceptor class is denoted by the @Interceptor annotation on the bean class with which it is associated. In the case of multiple interceptor classes, the @Interceptors annotation is used. Method specific interceptor is denoted by applying the @Interceptors annotation to the business method.

For example, the SearchFacade session bean might need to perform some database initialization when it is created or close some database connections when it is destroyed. The application can gain fine-grained control over the various stages of the bean lifecycle via methods known as callback methods. A callback method can be any method in the session bean that has callback annotations. The EJB container calls these methods at the appropriate stages of the bean’s lifecycle (bean creation and destruction).

Listing 2-7. clear(); } Interceptors The EJB specification provides annotations called interceptors, which allow you to interpose on a business method invocation to add your own wrapper code before and/or after the method is called. An interceptor method can be defined for session and message-driven beans (MDBs). We will show you the usage of interceptors in the session bean context. There are number of use cases for interceptors in a typical application in which you would find a need to perform a certain task before or after the business method is invoked.

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