Describe a possible architecture for a three-tier client server web applications bsaed?
XML related.
In general, three-tier architecture consists of a database backend (), a business layer and presentation layer. The level would be all back-end databases and other back-end services, where demand is consumed. The interface at this level is generally a sort of database or WebService protocol (ODBC databases or JDBC, soap, etc. for Web services.) Business layer is where all logic and flow control of residence. This is usually where most of the life of application code. The objective of this component is to encapsulate the logic of demand in the services of bulk grain that can be consumed by the presentation layer. The level of the enterprise is responsible receipt of contribution to the presentation layer, making the necessary updates or queries to the backend layer and provide output back to the layer overview. The main motivation for creating this level and use a starting tierd architecture is to decouple the user interface back-end systems that application uses. The presentation layer encapulates user interface. Since his system is based web pages would probably ASP or Java servlets that run in a sort of web server. The presentation serves as a tie only with the user interface then communicates with the enterprise level through the services exposed. This communication may occur in a number of ways. Remote Call object using something like CORBA o. NET Remoting, the invocation of web services, messaging services or as many options for external communication and business presentation. As I said before, the important thing is that they are decoupled from the presentation layer only backend the interface with the business layer. Thus, if something about the database changes, the level of the company is the only party to the application that must change, and all code UI can remain isolated.
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