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n Assemble EJB JAR and web components (WAR) files created in the previous
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phases into a JEE application (EAR) file.
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n Specify the deployment descriptor for the JEE application. n Verify that the contents of the EAR file are well formed and comply with the
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JEE specification. The final deliverable for this stage is the completed EAR file containing the JEE enterprise application.
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JEE Application Deployment The deployer is the person who configures and deploys the JEE application, administers the computing and networking
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4: Applicability of JEE Technology
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infrastructure where JEE applications run, and oversees the runtime environment. Duties include setting security attributes, setting transaction controls, and specifying database connection pools. During configuration, the deployer follows instructions supplied by the application component provider to resolve external dependencies, specify security settings, and assign transaction attributes. During installation, the deployer is responsible for moving the components to the server and generating the classes and interfaces specific to the destination container. The deployer performs the following tasks to install and configure a JEE application:
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n Stage the initial JEE application (EAR) file created in the preceding phase to
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the JEE server.
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n Configure the JEE application for the operational environment by modifying
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the DD of the JEE application.
n Verify that the contents of the EAR file are well formed and comply with the
JEE specification.
n Deploy (install) the JEE application EAR file into the JEE server.
CERTIFICATION OBJECTIVE 4.02
Explain the Use of Patterns in the JEE Framework
In the context of computer architecture, design patterns are proven solutions to recurring business problems. They consider the particular context of the problem and the consequences of the solution. A good designer will use a pattern because it is proven that is, the designer has used it before successfully or has built and validated a proof of concept. Good architects use the experience, knowledge, and insights of developers who have used these patterns successfully in their own work. When a problem is common, a good designer doesn t have to devise a new solution; instead, he or she follows the pattern and adapts it to the current environment.
Use of Patterns in the JEE Framework
The JEE framework employs patterns to support these capabilities. These patterns will be covered in greater detail in 5, but to cover exam specifics, we will examine patterns that are prominent in the JEE framework. JEE uses the following core patterns
Explain the Use of Patterns in the JEE Framework
TABLE 4-2
Pattern
Proxy
Provides method calls to a principal object to occur indirectly through a proxy object that acts as an agent for the principal object, delegating method calls to that object Extends the functionality of a class such that it is transparent to its clients Provides a reusable class independent of the classes it instantiates because it delegates the choice of which class to instantiate to another object; refers to the newly created object via a common interface Provides a way to create instances of those abstract classes from a corresponding set of concrete subclasses
JEE Implementation
EJB remote interface
Patterns Used with the JEE Framework
Decorator Factory Method
EJBObject EJBHome interface
Abstract Factory
EJBHome interface
to enable flexible association of EJB classes with other components. The Proxy pattern provides a separate implementation of interface and working code for location transparency. The Decorator provides a similar contract for a class but with added functionality. The Factory Method provides ability to define a contract for creating an object but defers instantiation to subclasses. The Abstract Factory provides a contract for creating families of related or dependent objects without specifying concrete classes. Table 4-2 details the patterns used with the JEE framework.
The Proxy Pattern
The Proxy pattern (as shown in Figure 4-8) decouples interface and implementation by providing two objects. If the implementation class changes, the proxy remains the same. This is because the proxy interface includes only the method invocations and their signatures. So, it is lightweight in comparison to the implementation class (the working code). As architects, we typically examine what types of operations are expensive. For example, object creation and initialization is usually expensive. To improve application performance, it is a sound approach to defer object creation and object initialization to the time when you need the object. The Proxy pattern reduces the cost of accessing objects. It accomplishes this cost reduction because it
4: Applicability of JEE Technology
FIGURE 4-8
Proxy pattern
uses another object (the proxy) to act as a stand-in for the real object. The proxy creates the implementation object only if the user requests it. An example of the proxy pattern implemented in JEE is the EJB remote interface.
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