Lec2 ecom fall16
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1) The document discusses implementing a Java EE 7 distributed multi-tiered e-commerce application. It describes the key components of Java EE applications and how they are divided across tiers. 2) The main components discussed are the client tier, web tier, business tier, and EIS tier. The web tier uses technologies like servlets and JSPs. The business tier uses EJBs. 3) The document provides an example application architecture using JSF for the web tier, EJBs for the business tier, and JPA to interact with the database. It also discusses the MVC pattern and some popular MVC frameworks.
Lec2 ecom fall16
- 1. e-Commerce Systems Zainab KHALLOUF, Ph.D. Lecture 2 e-Commerce Systems Implementing Java EE 7 Distributed Multi-Tiered E-Commerce Application Fall 2016
- 2. References Books: The Java EE 7 Tutorial. http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf Courses sites Mutli Tier Applications with Java EE, Berne University of Applied Sciences Engineering and Information Technology, lecture notes by Prof. Dr. Eric Dubuis. https://prof.hti.bfh.ch/ Sites: http://netbeans.org/ Acknowledgments: Pr. Dr. Didier Donzes. http://membres-liglab.imag.fr/donsez/
- 3. Outline Overview of Java EE Distributed Multitiered Applications. Java EE Applications Components. Java EE Servers. Overview of MVC (Model View Controller) design pattern: One of the Java EE Design Patterns. E-Commerce Systems 3
- 4. Overview of Java EE Distributed Multitiered Applications The Java EE platform provides developers with a powerful set of APIs to program and deploy distributed multitiered applications for enterprise. Application logic is divided into components according to function, and these components are installed on various machines, depending on the tier in the multitiered Java EE environment to which the application component belongs. A Java EE component is a self-contained functional software unit that is assembled into a Java EE application and that communicates with other components. The Java EE 7 Tutorial. http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf E-Commerce Systems 4
- 5. Overview of Java EE Distributed Multitiered Applications (cont.) The Java EE 7 Tutorial. http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf E-Commerce Systems 5
- 6. Overview of Java EE Distributed Multitiered Applications (cont.) Java EE multitiered applications are generally considered to be three-tiered applications because they are distributed over three locations: Client machines. The Java EE server machine. The database or legacy machines. E-Commerce Systems 6
- 7. Java EE Applications Components Java EE applications are made up of the following components: Client-tier components run on the client machine (e.g. Dynamic web pages generated by web components running in the web tier, application clients and applets...). The Java EE 7 Tutorial. http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf E-Commerce Systems 7
- 8. Java EE Applications Components (cont.) Web-tier components run on the Java EE server and handle the interaction between clients and the business tier. The following Java EE technologies are used in the web tier in Java EE applications: Java Servlet, JavaServer Faces, JavaServer Pages (JSP), JavaBeans Components Its primary tasks are the following: Dynamically generate content in various formats for the client. Collect input from users of the client interface and return appropriate results from the components in the business tier. Control the flow of screens or pages on the client. Maintain the state of data for a user’s session. Perform some basic logic and hold some data temporarily in JavaBeans components. The Java EE 7 Tutorial. http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf E-Commerce Systems 8
- 9. Java EE Applications Components (cont.) Business-tier components run on the Java EE server and provide the business logic (i.e. the code that provides core functionality) for an application. The following Java EE technologies are used in the business tier in Java EE applications: Enterprise JavaBeans (enterprise bean) components, JAX-RS RESTful web services, JAX-WS web service endpoints, Java Persistence API entities. Enterprise information system (EIS)-tier software runs on the EIS server (e.g. Database and Legacy Systems). The Java EE 7 Tutorial. http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf E-Commerce Systems 9
- 10. Java EE Distributed Multitiered Application: JSF, EJB, JPA In this course I’ll focus on this architecture: E-Commerce Systems 10
- 11. Java EE Distributed Multitiered Application: Example http: //netbeans.org/kb/docs/javaee/ecommerce E-Commerce Systems 11
- 12. Java EE Distributed Multitiered Application: Example (cont.) E-Commerce Systems 12
- 13. Java EE Distributed Multitiered Application: Example (cont.) E-Commerce Systems 13
- 14. Advantages of Multitiers Tiers separate functionality: Presentation logic, business logic, and data schema. Easier upgrade: Since one tier can be changed without changing the rest. More extensible: New functionalities can be added more easily. E-Commerce Systems 14
- 15. Java EE Servers A Java EE server is a server application that implements the Java EE platform APIs and provides the standard Java EE services. Java EE servers are sometimes called application servers. Java EE server host several application component types. The Java EE server provides services to these components in the form of a containers. E-Commerce Systems 15
- 16. Java EE Containers Types http://netbeans.org/kb/docs/javaee/ecommerce/entity-session.html E-Commerce Systems 16
- 17. Java EE Application Servers
- 18. WildFly Formerly known as JBoss AS, or simply JBoss, is an application server authored by JBoss, now developed by Red Hat. GNU Lesser General Public License(LGPL). E-Commerce Systems 18
- 20. GlassFish AS http://glassfish.dev.java.net/ Common Development and Distribution License/GPL E-Commerce Systems 20
- 21. Other Java EE ASs IBM Websphere (Proprietary). Oracle BEA Weblogic (Proprietary). E-Commerce Systems 21
- 22. Overview of MVC (Model View Controller) design pattern: one of the Java EE Design Patterns.
- 23. What are Design Patterns? A design pattern is a general reusable solution to a commonly occurring problem in software design. A design pattern is not a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations. Object-oriented design patterns typically show relationships and interactions between classes or objects, without specifying the final application classes or objects that are involved. Book of Gang of Four (GoF) E-Commerce Systems 23
- 24. Why studying patterns ? Develop better products. Learn from others experience. Don’t reinvent the wheel. E-Commerce Systems 24
- 25. Why studying patterns ? Develop better products. Learn from others experience. Don’t reinvent the wheel. E-Commerce Systems 25
- 26. Why studying patterns ? Develop better products. Learn from others experience. Don’t reinvent the wheel. E-Commerce Systems 26
- 27. MVC (Model View Controller) Design Pattern
- 28. Web Model 1
- 29. Web Model 1 JSP page processes request and returns response to client E-Commerce Systems 29
- 30. Web Model 1 Limitations Uses much scriplet code in JSP. Tends not to be modular. Boundaries of responsibility are still unclear. E-Commerce Systems 30
- 31. Web Model 1 Limitations Uses much scriplet code in JSP. Tends not to be modular. Boundaries of responsibility are still unclear. E-Commerce Systems 31
- 32. Web Model 1 Limitations Uses much scriplet code in JSP. Tends not to be modular. Boundaries of responsibility are still unclear. E-Commerce Systems 32
- 33. Web Model 1 Demonstration. www.agiledeveloper.com/articles/JSPMVC.pdf
- 35. The Model Provide access to business data and logic to manipulate data. Notifies views when it changes. Provides the ability for the view to query the model about its state. Provides the ability for the controller to access application functionality. Model components can be implemented as JavaBeans, Enterprise JavaBeans (EJBs) and a range of other options. E-Commerce Systems 35
- 36. The Model Provide access to business data and logic to manipulate data. Notifies views when it changes. Provides the ability for the view to query the model about its state. Provides the ability for the controller to access application functionality. Model components can be implemented as JavaBeans, Enterprise JavaBeans (EJBs) and a range of other options. E-Commerce Systems 36
- 37. The Model Provide access to business data and logic to manipulate data. Notifies views when it changes. Provides the ability for the view to query the model about its state. Provides the ability for the controller to access application functionality. Model components can be implemented as JavaBeans, Enterprise JavaBeans (EJBs) and a range of other options. E-Commerce Systems 37
- 38. The Model Provide access to business data and logic to manipulate data. Notifies views when it changes. Provides the ability for the view to query the model about its state. Provides the ability for the controller to access application functionality. Model components can be implemented as JavaBeans, Enterprise JavaBeans (EJBs) and a range of other options. E-Commerce Systems 38
- 39. The Model Provide access to business data and logic to manipulate data. Notifies views when it changes. Provides the ability for the view to query the model about its state. Provides the ability for the controller to access application functionality. Model components can be implemented as JavaBeans, Enterprise JavaBeans (EJBs) and a range of other options. E-Commerce Systems 39
- 40. View Components Renders the contents of a model. Typically simple JSPs or HTML pages. Open to future presentation technologies. E-Commerce Systems 40
- 41. View Components Renders the contents of a model. Typically simple JSPs or HTML pages. Open to future presentation technologies. E-Commerce Systems 41
- 42. View Components Renders the contents of a model. Typically simple JSPs or HTML pages. Open to future presentation technologies. E-Commerce Systems 42
- 43. Controller Components Dispatches user requests. Selects views for presentation. interprets user inputs and maps them into actions to be performed by the model. E-Commerce Systems 43
- 44. Controller Components Dispatches user requests. Selects views for presentation. interprets user inputs and maps them into actions to be performed by the model. E-Commerce Systems 44
- 45. Controller Components Dispatches user requests. Selects views for presentation. interprets user inputs and maps them into actions to be performed by the model. E-Commerce Systems 45
- 47. MVC Frameworks Struts. Spring MVC http://www.springsource.org/. Java Server Pages (JSF). E-Commerce Systems 47
- 48. Questions?