Architecture Refresher

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1 Architecture Refresher Why use J2EE? J2EE Overview v WolfWare, Inc. 1 Distributed Applications Definition of Distributed Application (from Wikipedia): An application made up of distinct components running in separate runtime environments, usually on different platforms connected via a network. Typical distributed applications are two-tier (client-server), three-tier (client-middlewareserver), and multitier (client-multiple middlewaremultiple servers) Source: J2EE Overview v WolfWare, Inc. 2 Page 1

2 Client/Server 2 Tier Client Server Application - UI - Business Logic Database J2EE Overview v WolfWare, Inc. 3 C/S Disadvantages Performance depends on client PC High network traffic Maintenance Client Consistency J2EE Overview v WolfWare, Inc. 4 Page 2

3 3-Tier Architecture View Client UI Controller Server Bus. Logic Model Server Data J2EE Overview v WolfWare, Inc. 5 3-Tier Advantages Can support many different user interfaces (but must have a good API to business logic) Can support many different data sources (but must have a good API to business logic) J2EE Overview v WolfWare, Inc. 6 Page 3

4 Multi-Tier Architecture Divide business logic layer into functional subdivisions (not physical) Presentation Logic may differ for different UI s Business/Application logic Infrastructure Services Still follows MVC pattern J2EE Overview v WolfWare, Inc. 7 Enterprise Architecture Enterprise vs Collection of silos/stovepipes Allow multiple applications that work together in the middle tier Often have components that are used by several different applications (reusable) J2EE Overview v WolfWare, Inc. 8 Page 4

5 Why Use Java? Platform independent Reusability Objects (J2SE) Components (J2EE) Modularity J2EE provides for distributed applications using a component-based application model Container Services J2EE Overview v WolfWare, Inc. 9 Distributed Computing Issues Historically client/server Issues with threads, security, transactions, etc. CGI/Perl Issues with efficiency and scalability CORBA Issues with overhead, performance, portability J2EE Overview v WolfWare, Inc. 10 Page 5

6 Other Design Issues Importance of modularity The best tools can t prevent a bad design Potential historical servlet issues Potential historical JSP issues Relevance of separation of tiers, tasks J2EE Overview v WolfWare, Inc. 11 J2EE is a platform J2EE Platform Provides common components as built-ins Specifies contracts for 3 rd parties to follow to provide services Containers provide access to components in a standard manner (non-proprietary) J2EE Overview v WolfWare, Inc. 12 Page 6

7 J2EE Components Self-contained functional units Application clients and applets run on the server JSP and Servlet (web) components run on the server EJB (business) components run on the server J2EE Overview v WolfWare, Inc. 13 Run in browsers J2EE Web Clients Server generates HTML or XML Transmits to client over HTTP Web container application components include JSP and Servlets Web container is responsible for handling requests and generating responses J2EE Overview v WolfWare, Inc. 14 Page 7

8 J2EE EJB Clients Application clients access EJB components over RMI-IIOP Web container components (JSPs and Servlets) can also access EJB components over RMI-IIOP J2EE Overview v WolfWare, Inc. 15 J2EE Containers Runtime environment to manage application components and provide access to APIs Web Container hosts servlets and JSPs EJB Container hosts EJBs Applet Container for running applets Application Container for running standard java applications (JVM) J2EE Overview v WolfWare, Inc. 16 Page 8

9 Container Services Interface between components and lowlevel functionality Deploy components in a container Provide configurable support services Provide non-configurable services J2EE Overview v WolfWare, Inc. 17 J2EE APIs EJB Enterprise JavaBeans Java Servlet Technology JSP JavaServer Pages JSTL JSP Standard Tag Library JavaServer Faces JMS Java Messaging Service JTA Java Transaction API JavaMail JAF JavaBeans Activation Framework J2EE Overview v WolfWare, Inc. 18 Page 9

10 J2EE APIs JAXP Java API for XML Processing JAX-WS Java API for XML Web Services JAXB Java Architecture for XML Web Binding SAAJ SOAP with Attachments API for Java JAXR Java API for XML Registries J2EE Connector Architecture JDBC Java Database Connectivity Persistence JNDI Java Naming and Directory Interface JAAS Java Authentication and Authorization Service J2EE Overview v WolfWare, Inc. 19 Web Services Web-based applications Use XML-based standards and transport protocols (SOAP over HTTP) J2EE provides support for web services via container services Translate XML data streams Beyond the scope of this course J2EE Overview v WolfWare, Inc. 20 Page 10

11 J2EE Applications One or more units, each having: One or more functional components (EJB, Servlet, JSP, etc) Optional Deployment Descriptor Must be deployed to a J2EE platform Packaged in an ear file J2EE Overview v WolfWare, Inc. 21 EAR file Jar file with an ear extension Means of combining reusable components into different applications Contain components and deployment descriptors J2EE Overview v WolfWare, Inc. 22 Page 11

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