code 128 vb.net free EXERCISE 4-11 The Role of Transactions in Java

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EXERCISE 4-11 The Role of Transactions
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Question Describe the role of transactions. Answer Transactions ensure data integrity by controlling access to data. Transactions free an application programmer from the complex issues of failure recovery and multipleuser programming. Transactions are a mechanism for simplifying the development of distributed multiuser enterprise applications. Transactions span across all tiers.
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As you have seen, the JEE platform is a multi-tiered distributed application model, where application logic is divided into components according to their function. The various components of a JEE application are installed on different machines. A component s location depends on which tier or layer in the multi-tiered JEE environment that component belongs to. These components will already exist (legacy, client/server databases, messaging) and must be integrated with the JEE components. The enterprise architect must be aware of the way in which the JEE application framework can be used to integrate seamlessly with the existing myriad of business components that make up the enterprise environment. As you have seen in the chapter, these components reside at various tiers in the framework. The architect must understand the client tier components, web tier components, and business tier components that run on the JEE server, and, probably most important for the enterprise, the EIS tier.
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4: Applicability of JEE Technology
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Explain the JEE Architecture and System Requirements
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q While a JEE application can consist of three or more tiers or layers, JEE
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multi-tiered applications are generally considered to be three-tiered applications because they are distributed across three different locations: client machines, JEE server machine, and the database or legacy machines at the back end. JEE applications consist of client components, web components, and business components.
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q JEE applications are made up of components: self-contained functional
software units assembled into JEE applications with their related classes and files. These components communicate with other components.
q The component-based and platform-independent JEE architecture facilitates
development, because business logic is organized into reusable components, and the JEE server provides underlying services in the form of a container for every component type.
q A JEE application is usually assembled from two different types of modules:
enterprise beans and web components. Both of these modules are reusable; therefore, new applications can be built from pre-existing enterprise beans and components. The modules are also portable, so the application that comprises them will be able to run on any JEE server conforming to the specifications.
Explain the Use of Patterns in the JEE Framework
q The JEE framework employs design patterns to support these capabilities. JEE
uses the following core patterns 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.
q The use of best practices, design patterns, and guidelines is important for JEE
architects. Successful architects and 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.
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Describe the Concepts of Best Practices and Guidelines
q A best practice is an optimal process that is recognized and approved by
peers in similar situations. It is applicable to a cross-section of scenarios with varying resources and sizes. It takes design requirements into consideration.
q A guideline is a rule applied horizontally to the design. Guidelines reflect
agreements on practices or operations by recognized professional associations. This includes formal, approved standards, as contrasted to de facto standards and proprietary standards that are exceptions to this concept.
Illustrate the Use of JEE for Workflow
q A common method for designing applications is to organize them around an
event-driven user interface. Utilizing the MVC design pattern best practice results in a separation of the application data from the ways that the data can be accessed or viewed as well as from the mapping between system events (such as user interface events) and application behaviors.
Review Best Practices Applicable for All Tiers
q The Enterprise JavaBeans (EJB) tier hosts the application-specific business
objects and the system-level services (such as transaction management, concurrency control, and security). The EJB tier is a critical link between the web tier and the EIS integration tier. It typically hosts the entity beans and session beans, data access objects and value objects, and perhaps master-detail modeling using enterprise beans.
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