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Describe the Concepts of Best Practices and Guidelines
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Business Delegate Value Object Session Facade Aggregate Entity Value Object Assembler Value List Handler Service Locator
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Decouples presentation and service tiers and provides a facade and proxy interface to the services Exchanges data between tiers Hides business object complexity, and centralizes workflow handling Represents a best practice for designing coarsegrained entity beans Builds composite value object from multiple data sources Manages query execution, results caching, and result processing Hides complexity of business service lookup and creation; locates business service factories
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Data Access Object Service Activator
Description
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Integration Tier Patterns
CERTIFICATION OBJECTIVE 4.03
Describe the Concepts of Best Practices and Guidelines
Successful companies establish the use of refactoring, best practices, patterns, and tools; they spread the awareness of these among their JEE programmers and architects. Successful developers share their knowledge and pass on their proven techniques to others. The net result is productivity. The ultimate product is the implementation of solid applications.
4: Applicability of JEE Technology
The challenges we face in software development today as always are twofold:
n Obtaining and maintaining the architectural and developmental skills to
build effective enterprise systems
n Meeting market-driven time lines for developing new applications while
maintaining quality in our implementations Experienced architects often make trade-offs to meet deadlines. These tradeoffs include the use of refactoring and other techniques to optimize development time and address the inherent performance considerations. We tend to hold onto our software designs for too long. Even after they become unwieldy, we continue to use and reuse code that is no longer maintainable because it works, we are afraid to modify it. But this is typically not cost effective. When we refactor, we remove redundancy, eliminate unused functionality, and reengineer designs. Refactoring throughout the entire project life cycle saves time and increases quality. Refactoring keeps the design simple, and avoids needless complexity, keeps code clean and concise, and makes it easier to understand, modify, and extend the code. Moreover, application behavior is known to change throughout the application life cycle that is, from development to production. As performance and stability issues are discovered, the application should be amended and improved. Experience yields BluePrints for solving recurring problems: therefore, the term best practice. A best practice is a technique used to drive design at the component level. For example, a best practice might be to use session beans as facades to entity beans. On the other hand, a guideline is a rule applied horizontally to the design. For example, to minimize network traffic, the architect attempts to maximize the content of data requests that is, we try to get as much as we can out of each request. As mentioned, the JEE architecture typically consists of three basic tiers in the platform, as shown in Figure 4-10. With respect to each tier, we will introduce and review some of the best practices.
FIGURE 4-10
JEE tiers
Describe the Concepts of Best Practices and Guidelines
Identifying the Need for Best Practices
In development, the question should not be Is there a best practice Instead, it should be Will this best practice improve our application For example, caching of frequently used data and references will benefit any JEE application; however, determining what is frequently used can be difficult in development. By testing early releases of an application, developers can locate and correct inappropriate design decisions. In the quality assurance (QA) stage of an application life cycle, it is often assumed that best practices and appropriate patterns have already been applied. The typical QA team is unlikely to have the expertise needed to identify the need for best practices. If the application is deemed to perform poorly or fail, it will have to be amended by the development team at a great expense. It is therefore extremely important to determine the application hot spots and suggest the primary candidates for reworking. In the enterprise production environment, applying new design patterns and best practices to a production system is more than difficult both technically and politically. It can, however, be essential to creating a mature and ultimately successful application. Interrupting service to clients to redeploy a production application will commonly happen if the application fails or is unusable. What the good architect has is the uncommon ability to identify when performance is under par and justify expending additional resources to refactor by specifying the nature of the problem. You can apply best practices and guidelines in each tier, including the client tier, web tier (presentation), EJB tier (business logic), and database or EIS integration tier (integration). You can also apply refactoring and guidelines to orthogonal services that span tiers including security and transaction processing.
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