gives an example of a client view in Java

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gives an example of a client view
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showing elements inside the subsystem Note the specific stereotypes shown on the different elements The stereotypes indicate that the UML constructs have been extended in t heir meaning to support special needs of the J2EE architecture Such stereotyping also offers a simple and compact means of identifying the specific role played by a specific model element that is part of an EJB
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Figure 12-2 Full client view representation of a session bean in a UML class diagram
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In practice, it is often desired to just use one of the more compact representations of the UML subsystem for the client view This has the advantage of avoiding unnecessary clutter in your model diagrams In this case, the preferred client view representation is shown in Figure 12-3
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Figure 12-3 Compact client view representation of a session bean in a UML class diagram
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Internal View
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The internal view of an EJB includes all components of the client view, the implementation class and its associated relationships, and any other classes the user may have added to the design of the EJB In a UML class diagram, these elements appear as normal classes and interfaces
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The client view is the fa ade for an EJB The internal view of an EJB is obtained by exposing the UML package contents completely, as shown in Figure
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Figure 12-4 Internal view representation of a session bean in a UML class diagram
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Session Beans
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The areas we have discussed thus far apply equally well to all EJBs Now we'll focus our attention specifically on the session bean type of EJB
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Session beans were the first EJB type to receive wide adoption and general use In many J2EE development projects today, session beans are the only EJB type actually being used This is likely to change in the future as the EJB specification enhances existing capabilities and introduces additional bean types, and as enterprise application servers improve their support for both the currently existing and newly defined types
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Session beans are currently used primarily to handle client transactions or, as the name implies, client sessions
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The key advantages of using session beans are
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Built-in transaction management capabilities Built-in state management capabilities
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The beauty of using EJB components is that many additional benefits, such as automated resource management, concurrency, and security, are also provided by the EJB container
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Every time you shop at a Web site built on the J2EE platform, there is a high likelihood that a session bean is handling much of the state and transaction management aspects of your shopping experience Likewise, when dealing with your online trading brokerage, an Internet banking account, or any number of services you can imagine on the Web, session beans are most often being used to handle your transactions
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J2EE Versions
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The topics covered in this chapter apply equally well to session beans using J2EE 13 as well as J2EE 12 There are very few differences between the two specifications with respect to session beans, and from a UML modeling point of view, they are essentially identical As you will see in later chapters, there are other EJB component types where this is not necessarily the case
Types of Session Beans and Conversational State
Session beans are designed to handle as many of the low-level state and transactional aspects of a client session as possible However, there are several levels of control that Web developers may choose from to determine how much of the EJB container capabilities they want to use, and how much they still want to code manually
Session beans come in two major varieties, stateful and stateless This determines whether or not the component can retain what is known as conversational state
Conversational state is defined as the data describing the conversation represented by a specific client pairing with a session object
If the session bean retains this state, it provides the client with the ability to work with a particular session object, leave for some arbitrary amount of time (seconds, minutes, hours, days, etc), and then return at a later time and pick up exactly where he or she left off with the same session object This is called a stateful session bean
In the opposite case, a client works with a given session obje ct, and then leaves for some random amount of time Immediately upon leaving, the session object is dropped and no
conversational state is retained If the client returns, a new session object is created and everything starts from the beginning This is ca lled a stateless session bean
Because stateless session beans take up less system resources, they tend to be deployed more often than the stateful variety As the requirements and client expectations for a session bean grow and EJB containers provide more efficient resource management capabilities, it becomes more compelling to use stateful session beans and reap the additional benefits