Java Petstore : A Case Study

1. Java Petstore : A Case Study Rohit Nambiar July 2005

2. OBJECTIVE : • Demonstrate, Java BluePrints help in building flexible, scalable, cross-platform Web-based applications. • Show the recommended Architectural design pattern approaches to designing J2ee application. • Discuss the Architecture of the Petstore Application. • Discuss the consistent Petstore design conforming to the J2ee Design Patterns. • Give an Overview as to how the application benefits from such Architecture and Design. • Build and run the petstore application. • Unit testing, Profiling and Load testing the Petstore application to get some performance statistics.

3. Background : • Basic J2ee Architecture

4. Background continued…… • J2EE application is hosted within a container • Consists of Client Tier, Web Service container and Back end Database • Web Service container – Web Container and EJB container • Business logic is built using Enterprise JavaBeans (EJB) components. and connects to databases using JDBC or SQL/J • Business partners can connect with J2EE applications through web services technologies (SOAP, UDDI, WSDL, ebXML)

5. Introduction Continued…… Use Case Diagram

7. Petstore Model View Controller Architecture: • The MVC architecture provides flexibility, reusability, testability and clear design roles for application components.

8. Structural View Architecture:

9. Petstore Modules & Functionalities: • Web Application Framework

10. Class Diagram – SignOn Module

11. Product Catalog Module

12. Shopping Cart Module

13. Mail Module:

14. Customer Module:

15. Control Module: • Filter Request: Encoding Filter, which ensures that request and response encoding match and SignOnFilter, which enforces security and performs user signon. • Front Controller - MainServlet processes all requests and handles request dispatch, screen flow, and view generation. • Map request to HTML action and execute HTML action • Map event to EJB action and execute EJB action • View selection

16. Control Module Continued……..

17. PAGE FLOW DIAGRAM:

18. Evaluations: • Web Application Framework - WAF provides a number of services including request filtering and dispatching, templated view generation, a set of reusable custom tags, and screen flow control. • EJB centric design – For Petstore, the buisness logic is shifted to the EJB tier. This provides scalability, reliability, persistence, asynchronous communication and security control. • Local enterprise beans – It provides high-performance access to fine-grained business logic, while maintaining the high-level services of an enterprise beans container. • Code Complexity – Approximately 14200 lines of code. 100 Packages appx and 300 Classes appx.

19. Enhancement: • Sun claims blueprints described are not for performance but is a kind of benchmark for building j2ee applications. • No real performance measure were done to compare with other web applications. • To have a comparative case study of the architectural and design differences of a java Petstore and an equivalent .Net Petshop and run some perfomance tests to get some statistics.

20. Refrences: [1] Sun Microsystems, 1994-2005; www.java.sun.com[2] Java Blueprints, http://java.sun.com/reference/blueprints[3] Java Petstore Source code,http://java.sun.com/j2ee//1.4/download.html#samples[4] D. Alur, J. Crupi, D. Malks. Core J2EE Patterns., Prentice Hall PTR.[5] Model–View–Controller, http://java.sun.com/blueprints/patterns/j2ee_patterns/model_view_controller/[6] Core j2ee Patterns, http://java.sun.com/blueprints/corej2eepatterns/index.html[7] Designing Enterprise Applications with the J2EETM Platform, Second Editionhttp://java.sun.com/blueprints/guidelines/designing_enterprise_applications_2e/[8] Java Pet Store Sample Application Implements Core J2EE Patterns,http://java.sun.com/blueprints/patterns/catalog.html[9] AppPerfect DevSuite 5.0 Testing Tool, http://www.appperfect.com/products/devsuite/index.html