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The Presentation Layer
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The presentation layer generates web pages and any dynamic content in the web pages. The dynamic content is typically obtained from a database; for example, content may consist of a list of transactions conducted during the last month. The other major job of the presentation layer is to package requests contained on the web pages coming back from the client. The presentation layer can be built with a number of different tools. The presentation layers for the first web sites were built as Common Gateway Interface (CGI) programs. Netscape servers also offered server-side JavaScript for web sites. Contemporary web sites generally have presentation layers built using the Microsoft solution, Active Server Pages (ASP), which may be generated by Visual InterDev, or they use the Java solution, which utilizes some combination of servlets and JSP. Tools provide methods to facilitate embedding dynamic content inside other static HTML in the web page. They also provide tools for simple parsing of the web pages coming back from the client to extract the user-entered information. The presentation layer is generally implemented inside a web server (such as Microsoft IIS, BEA WebLogic, or IBM WebSphere). The web server typically handles requests for several applications in addition to requests for the site s static web pages. Based on the initial configuration, the web server knows to which application to forward the client-based request (or which static web page to serve up).
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The Business Logic Layer
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The bulk of the application logic is written in the business logic layer. The challenge here is to allocate adequate time and resources to identify and implement this logic. Business logic includes the following:
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n Performance of all required calculations and validations n Workflow management (including keeping track of session data) n Management of all data access for the presentation layer
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In modern web applications, business logic is frequently built using the Java solution, with Enterprise JavaBeans (EJB) that are built to carry out the business operations. Language-independent Common Object Request Broker Architecture (CORBA) objects can also be built and accessed with a Java presentation tier. The main component of CORBA is the Object Request Broker (ORB). It encapsulates the communication infrastructure necessary to locate objects, manage connections, and deliver data. The ORB core is responsible for the communication of requests. The basic functionality provided by the ORB consists of passing the requests from clients to the object implementations on which they are invoked. The ORB then transfers the request to the object implementation, which receives the request, processes it, and returns an object result. Much like the presentation layer, the business logic layer is generally implemented inside the application server. The application server automates many services, such as transactions, security, persistence/connection pooling, messaging, and name services. Isolating the business logic from the need to manage resources allows the developer to focus on building application logic. In the application server marketplace, vendors differentiate their products based on manageability, security, reliability, scalability, and tools support.
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The data layer is responsible for data management. A data layer may be as simple as a modern relational database; on the other hand, it may include data access procedures to other data sources such as nonrelational databases, legacy files, or message-oriented middleware. The data layer provides the business logic layer with required data when needed and stores data when requested. To avoid making an application less interoperable, the architect should strive to keep validation and business logic out of the data layer; that logic belongs in the business logic layer. Sometimes basic database design rules can overlap with business logic. There is usually some basic business logic in the data tier. For example,
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