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art 2 of this book covers how you can use EJB 3 components (session beans and message-driven beans) to build business logic for your enterprise Java applications. 3 covers session beans in detail and describes the development of both stateless and stateful beans and their clients. The chapter provides guidelines to help you decide whether to use stateless or stateful session beans. Asynchronous communication is accomplished by messaging, and chapter 4 explores messaging and message-driven beans. You can use several advanced features, such as dependency injection, interceptors, and timers; these topics are examined in chapter 5. 6 covers enterprise applications development concerns, such as transaction and security.

The client that is using this code is very similar to the client of the previous sample: // Lib5Client.cpp // compile with "CL /MD Lib5Client.cpp" #pragma comment (lib, "Lib5.lib") extern "C" __declspec(dllimport) void f(); int main() { f(); } This application also fails to execute, because the managed code in the HelperClass constructor is called during the native initialization of the mixed-code DLL.

Note Transport level security is the term used when data protection is provided by securing the communication channel itself. The most common example is the HTTPS channel that secures connections between browsers and web servers. HTTPS is based on the SSL protocol.

Development of stateless and stateful session beans Session bean lifecycle Session bean clients Session bean performance considerations and best practices

At the heart of any enterprise application lies its business logic. In an ideal world, application developers should only be concerned with defining and implementing the business logic, while concerns like presentation, persistence, or integration should largely be window dressing. From this perspective, session beans are the most important part of the EJB technology because their purpose in life is to model high-level business processes. If you think of a business system as a horse-drawn chariot with a driver carrying the Greco-Roman champion to battle, session beans are the driver. Session beans utilize data and system resources (the chariot and the horses) to implement the goals of the user (the champion) using business logic (the skills and judgment of the driver). For this and other reasons, sessions beans, particularly stateless session beans, have been popular, even despite the problems of EJB 2. EJB 3 makes this vital bean type a lot easier to use. In chapter 1 we briefly introduced session beans. In chapter 2 we saw simple examples of these beans in action. In this chapter, we ll discuss session beans in much greater detail, focusing on their purpose, the different types of session beans, how to develop them, and some of the advanced session bean features available to you. We start this chapter by exploring some basic session bean concepts, and then discuss some fundamental characteristics of session beans. We then cover each type stateful and stateless in detail before introducing bean client code. Finally, we examine session bean best practices at the end of the chapter.

A typical enterprise application will have numerous business activities or processes. For example, our ActionBazaar application has processes such as creating a user, adding an item for auctioning, bidding for an item, ordering an item, and many more. Session beans can be used to encapsulate the business logic for all such processes. The theory behind session beans centers on the idea that each request by a client to complete a distinct business process is completed in a session. So what is a session If you have used a Unix server you may have used Telnet to connect to the server from a PC client. Telnet allows you to establish a login session with the Unix server for a finite amount of time. During this session you may execute several commands in the server. Simply put, a session is a connection between a client and a server that lasts for a finite period of time.