Complete Separation of the 3 Tiers
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Complete Separation of the 3 Tiers

Divide and Conquer

About the Book

Most Java applications, including web based ones, follow the 3-tier architecture. Although Java provides standard tools for tier-to-tier interfaces, the separation of the tiers is usually not perfect. E.g. the database interface, JDBC, assumes that SQL statements are issued from the application server. Similarly, in web based Java applications, HTML code is assumed to be produced by servlets. In terms of syntax, this turns Java source code into mixtures of languages: Java and SQL, Java and HTML. These language mixtures are difficult to read, modify, and maintain.

In this paper we examine criteria and methods to achieve a good separation of the 3 tiers and propose a technique to provide a clean separation. Our proposed technique requires an explicit Interface and Data Definitions. These allow isolation of the back-end, application server, and front-end development. The Definitions also enable application design in terms of aggregated data structures. As a result significant amounts of auxiliary code can be generated from the Definitions, enabling the developers to concentrate on the business logic. By and large the proposed approach greatly facilitates development and maintenance, and overall improves the quality of the products.

About the Author

Table of Contents

  • 1. Servlets
  • 2. JSP
  • 3. Template Engines
  • 4. JDBC
  • 5. SQL Strings (Q Files)
  • 6. Stored Procedures
  • 7. Postgres
  • 8. Connection Management
  • 9. EJBs
  • 10. CORBA
  • 11. WSDL
  • 12. Struts
  • 13. Spring MVC
  • 1. APIs
  • 2. Beans
  • 3. Common Types
  • 4. Composite Beans
  • 5. Delivered Beans
  • 6. Vectors
  • 7. Java Interfaces
  • 8. Business Logic
  • 9. Server Call
  • 10. Exception Handling
  • 11. Stored Procedure Wrappers
  • 12. Web Client Interface
  • 14. Request Parameters
  • 15. Screens
  • 16. Rendering a Screen
  • 17. XSL Templates
  • 1. A Simple Example
  • 2. Projects
  • 3. Evolution
  • 3. Java String
  • 6. Arrays and Vectors
  • 11. JDBC Parameters

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