1 / 30

Comp2513 Web/Application Servers

Comp2513 Web/Application Servers. Daniel L. Silver, Ph.D. Objectives. To cover basic material on HTTP and Java Application Servers To introduce J2EE - a more powerful middleware To discuss the leading application servers on the market. Outline. The Apache HTTP server

bruno
Télécharger la présentation

Comp2513 Web/Application Servers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Comp2513Web/Application Servers Daniel L. Silver, Ph.D.

  2. Objectives • To cover basic material on HTTP and Java Application Servers • To introduce J2EE - a more powerful middleware • To discuss the leading application servers on the market Daniel L. Silver

  3. Outline • The Apache HTTP server • Java application servers • The need for more powerful middleware • J2EE • A comparision of the leading application servers on the market Daniel L. Silver

  4. Evolution on the Web App. Servers Processes Functionality Web-enabled applicatons Transactions Interactivity CGI Servers Dynamic web pages Publishing HTTP Servers Static web pages Time or Maturity Daniel L. Silver

  5. The Apache HTTP Server • What is unique about the development of Apache? See www.apache.org • What other software system shares this characteristic? • First created in 1995 by Rob McCool, NCSA • Survey says: 63% of the HTTP server market • Available for Unix, Linux, Windows (NT, 98) • Homework: Where did it get its name? Daniel L. Silver

  6. The Apache HTTP Server • Architecture: • Modular in nature • Promotes slim and simple configurations • Modules can be compiled and loaded as needed such as • Core - core apache features – required! • mod_access, mod_auth - administration of host and user group access • mod_action, mod_cgi - Action on requested CGI script files • mod_asis - “as is” delivery of certain file types (e.g. *.txt) • mod-alias - Access to directories not in the apache root • mod_usretrack -User tracking via cookies Daniel L. Silver

  7. Apache HTML Processing Client http://eagle.acadiau.ca/store15/index.html Browser HTTP admin Apache HTTP Server Internet http/https ../store15/index.html Daniel L. Silver

  8. Apache CGI Processing Client http://eagle.acadiau.ca/store15/cgi-bin/Hello.cgi Browser HTTP admin Apache HTTP Server Internet http/https mod.CGI ../store15/cgi-bin/Hello.cgi Unix Op. sys. Daniel L. Silver

  9. Java Application Servers • Application servers were created originally to field multiple simultaneous CGI requests, the divide and conquer approach • Java servlets were introduced by Sun as a method of providing the benefits of server-side processing while taking advantage of many great Java characteristics: • Developers new the langauge • Simple to understand • There were lost of objects and methods already written • Code was portable to many different servers (JVM) • Faster than CGIs Daniel L. Silver

  10. Tomcat Java Servlet Processing http://eagle.acadiau.ca/store15/servlet/FirstServlet Client Tomcat admin Browser HTTP Server Tomcat Java App. Server Internet Java Bean FirstServlet.class Daniel L. Silver

  11. Tomcat JSP Processing http://eagle.acadiau.ca/store15/index.jsp Client E-Comm DB Browser Tomcat Java App. Server HTTP Server Store category or product data Internet Class DB Java Bean ../store15/index.jsp Pointer to internal .class file for index.jsp Daniel L. Silver

  12. The E-Business Architecture Partners, Suppliers SupCM PM KM ERP Employees Stakeholders Middleware A new era of Cross-Functional Integrated Applications SellCM CRM Customers, Distributors Daniel L. Silver

  13. Constructing the E-Business Architecture • A New Era of Cross-Functional Integrated Applications • CRM = Customer Relationship Management • ERP = Enterprise Resource Planning • SupCM = Supply Chain Management • SellCM = Selling Chain Management • PM = Procurement (Operational Resource) Management • KM = Knowledge Management (DW/Analytics) • Middleware = Integration Applications Daniel L. Silver

  14. The Need for More Powerful Middleware • More efficient use of server resources • Flexibility - ever changing products, technology, business process • Multi-channel interfaces has forced separation of: • Customer (web) interface aspect • Enterprise (application) interface aspects • End-to-end transaction integrity required • Security – a primary concern • Integration – ability to integrate with other and often older computer systems Daniel L. Silver

  15. Java has Risen to the Challenge • Why Java? • Object-oriented • Platform independent • Network aware • Multi-threaded (easy to develop applications that do two or more things at a time) • Relatively fast learning curve • Faster development times Daniel L. Silver

  16. J2EE • In 1999, Sun Microsystems announced a comprehesive Java based middleware architecture and technolgy called Java 2 Enterprise Edition or J2EE: • Full server side Java standard development platform • Solid backend for many wireless applications • Solid infrastructure with many commonly used components (Java Beans … think objects) Daniel L. Silver

  17. J2EE • J2EE provides: • EJB – Enterprse Java Beans, handle critical tasks of E-commerce such as transactions and DB access • JSPs – Java Server Pages, brings flexibility to user interfaces • Java Servlets provide link between user interface and backend enterprise applications • JDBC – Java Database Connectivity, standard interface for access to relational DB Daniel L. Silver

  18. Common Characteristics of Application Servers • Connectivity to various applications and DBs on various operating environments and hardware • Provides an integrated IDE for all aspects • Support for reusable distributed components (CORBA, COM, EJB) • Performance management (load balancing, caching, monitoring) • Robust and reliable software – redundancy, backup/recovery • User-friendly administrative, diagnostic tools • Strong security framework Daniel L. Silver

  19. 3-Tier Architectural of Modern Web Servers ERP Client 1 Browser HTTP TCP/IP Server A HTTP Server App. Server Database Server Internet Client 2 Browser prog2.class URL index.html prog1.cgi Server B Bank Server Daniel L. Silver

  20. The Major Application Server Providers • BEA – WebLogic (7.0) - 24% of market • IBM – WebSphere (4.0) – 33% • Oracle – Oracle(Ias (1.0) – 12% • SUN – Sun ONE (was iPlanet) – 8% • Macromedia – ColdFusion (MX) Daniel L. Silver

  21. Comparison of Major Application Servers • Refer to class handout • BEA - WebLogic (7.0) • The most widely used server on the market • Very scalable • Bridges cap between SUN Java J2EE and MS COM • Robust features, great security framework • Support for wireless mobile clients (J2ME) • Maintenance and support is managable • Number 1 with many commercial users Daniel L. Silver

  22. Comparison of Major Application Servers • IBM – WebSphere (4.0) • Java technology based – full J2EE support • Sophisticated integration capabilities to COM and CORBA systems • Scales well • Fits well with DB2 and other IBM E-Business products • Support for wireless mobile clients (J2ME) • Requires greater care and feeding • Excellent for large companies Daniel L. Silver

  23. Comparison of Major Application Servers • Oracle – Oracle(Ias (1.0) • Claim to be the worlds leading wireless mobile application server • J2EE and XML programming model that radically simplifies development, installation and management • Well situated for wireless web apps • Good choice for medium to large companies Daniel L. Silver

  24. Comparison of Major Application Servers • SUN – Sun ONE (was iPlanet) • Excellent scaling and robustness • Automatic failover capabilities • Integrate XML parser to facilitate B2B apps • Version 6.5 promises new developer tools and resources • SUN has been the Java leader on the Web • Always worth considering Daniel L. Silver

  25. Comparison of Major Application Servers • Macromedia – ColdFusion (MX) • An easy-to-use web development environment • Kawa (discontinued) • Macromedia Flash MX • Dreamweaver MX • Uses its own powerful server-side scripting language • Has moved to the Java architecture • Also will support .NET and J2EE • Great for small to medium sized companies Daniel L. Silver

  26. THE ENDdanny.silver@acadiau.ca

  27. The E-Business Architecture Partners, Suppliers SupCM PM KM ERP Employees Stakeholders Middleware SellCM CRM Customers, Distributors Daniel L. Silver

  28. Constructing the E-Business Architecture • CRM = Customer Relationship Management • Marketing, Sales, Service • ERP = Enterprise Resource Planning • Forecasting and Planning • Purchasing and Material Management • Inventory Management • Finished Porduct distribution • Accounting and Finance Daniel L. Silver

  29. Constructing the E-Business Architecture • SupCM = Supply Chain Management • Market demand • Resource and capacity constraints • Real-time scheduling • SellCM = Selling Chain Management • Product Customization • Pricing, Contract and Commission Management • Quote and Proposal Generation • Promotions Management Daniel L. Silver

  30. Constructing the E-Business Architecture • PM = Procurement Management • Office Supplies, Business Travel, Entertainment, Service contracting, IT h/w, s/w and networking • KM = Knowledge Management (DW/Analytics) • Data Warehousing • Business Analytics (data mining) • Executive Info Systems, Decision Support Systems • Middleware = Integration Applications • e.g. SAP (ERP) to SAS (KM) Daniel L. Silver

More Related