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Understanding Server-Side Technologies
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CERTIFICATION OBJECTIVE
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Exam Objective 8.3 Describe at a high level the use and basic characteristics of EJB session, entity, and message-driven beans. The Enterprise JavaBeans API came about in the early days of Java. Back in 1998, the first EJB specification was released: EJB 1.0. Its focus was on providing a framework for how Java-based enterprise business logic would be implemented in the business tier. Because of the critical nature of this tier, the EJB specification has and continues to evolve, adding and refining functionality along the way. The exam targets EJB 2.1 (JSR-153), which is part of Java EE 1.4. The current development release of Enterprise JavaBeans is EJB 3.1.
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At its simplest, the Enterprise JavaBeans API allows for the creation of enterprise beans. Three different types of enterprise beans are shown in Table 12-5. They are session, entity, and message-driven beans. These enterprise beans are components in the business tier that are responsible for executing the business logic of an application. The beans are managed by the EJB container that handles responsibilities such as security authorization and transaction management. The EJB container handles these tasks behind the scenes, allowing the software developers to stay focused on creating their business logic. Unlike languages such as Coldfusion, which contains the business logic at the page level, EJBs are designed to separate the business logic from the presentation logic. This separation of logic allows the business tier developers to focus on creating the business logic and lets the page authors focus on creating the presentation logic. In producing their separate code, the different domain developers can collaborate, or they can work off of defined interfaces that they can glue together once they are completed. The Enterprise JavaBeans API resides in the javax.ejb package. The interfaces for session, entity, and message-driven beans are SessionBean, EntityBean, and MessageDrivenBean (respectively), as shown in Figure 12-6. These interfaces
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TABlE 12-5
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Session Bean
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Definition
A type of EJB that performs tasks (methods) for a client. There are stateful and stateless session beans. A stateful bean maintains a conversation state for the client, while a stateless bean does not. A persistent type of EJB, representing a business entity object, that is typically associated with a table in a relational database. A type of EJB that processes messages asynchronously, acting as a Java Message Service listener.
Enterprise JavaBeans
Entity Bean
Message-Driven Bean
all implement the interface EnterpriseBean, allowing for polymorphism. See 8 for more on polymorphism. The EnterpriseBean class also exists for serialization purposes (that is, saving and restoring objects) since the only thing it does explicitly is extend the Serializable interface. As is the nature of interfaces, each EJB has several methods that must be implemented.
FIgURE 12-6
javax.ejb <<interface>> EnterpriseBean <<interface>> Serializable
Enterprise JavaBeans
Core EJB Interfaces
<<interface>> SessionBean
<<interface>> EntityBean
<<interface>> MessageDrivenBean
12:
Understanding Server-Side Technologies
CERTIFICATION SUMMARy
You must understand the differences in regards to enterprise tiers and the basic purpose of the server-side technologies. This chapter discussed various server-side technologies and solutions, as well as where they belong in different tiers. The web tier was discussed. This tier is responsible for the presentation layer, supporting dynamic web content. The web tier contains a web container where the JSP and servlet APIs are implemented. The JSP API specification is for a scripting and tag library used for rendering web content. The servlet API is designed to render web content as well, but servlets generally produce the HTML from JSP pages. Actually, JSP pages are converted into servlets. Servlets, also known as controllers, interface with the external web browsers, displaying the web pages and controlling the logic. The business tier was discussed. This tier is responsible for the business logic and is supported by Enterprise JavaBeans. Separating the business logic from the presentation logic allows the code to be more maintainable. Three main types of Enterprise JavaBeans support the business tier: session beans, message-driven beans, and entity beans. EJB session beans perform methods for the client. Stateful and stateless session beans also exist. Stateful session beans maintain the state of the client s session. EJB message-driven beans handle messages asynchronously. EJB entity beans provide database mapping support. The Java Persistent API provides an alternative to the EJB entity beans. The Enterprise Information System (EIS) tier was discussed. This tier includes databases, relational databases, legacy applications, and enterprise resource planning systems. The most common use of the EIS tier is the execution of a relational database on an external server. Additional server-side solutions that were discussed include JMS, SMTP, JavaMail, JAX-RPC, and the web services APIs. SMTP and the JavaMail API work together to provide mail solutions. JAX-RPC is an API designed for remote procedure calls. Web Services include SOAP, UDDI, and WSDL, which are all web-based solutions based on XML.
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