ISM 50 - Business Information Systems
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1 ISM 50 - Business Information Systems Lecture 10 Instructor: Magdalini Eirinaki UC Santa Cruz May 3, 2007
2 Outline Announcements Student Presentation Client-Server Architecture Student Presentation The SUN N-Tier Architecture Mid-term Feedback Survey
3 Announcements Midterm Tuesday! Study guide posted Review sessions: Monday 5/7, 4-5PM, BE 316 (knock on the door) Tuesday 5/8, 9-10:30AM, BE 314 Assignment 3 due today
4 Announcements Mid-quarter feedback Today Anonymous Informal Your instructor will use your comments in order to make adjustments, if needed Your feedback is important! Be honest and objective Will be shared with class
5 Student Presentation Derek Moore
6 Client - Server Computing
7 Recall - The Micro Era 1981 IBM introduces its PC! Rapidly adopted by the commercial market Others followed 1983 Compaq introduces first successful IBM-PC clone 1983 Apple introduces first personal computer with GUI 1984 DELL is founded
8 Recall - The Micro Era The transition from mainframes to microcomputers was not easy! Easier to manage one central mainframe than a PC on every employees desktop! Data not Centralized Replication of accounting and reporting functions The numbers on my PC are right, the ones on your PC are wrong! Security Risks
9 Recall - The Micro Era The DP managers defied PCs The users liked them! Users wanted the convenience of word processing, spreadsheets, etc
10 At the same time Internet evolved 1969 ARPANET linked scientists 1977 TCP/IP used to link networks to ARPANET 1984 the term Internet comes into use (by scientists, military, hobbyists) 1985 NSF takes over management of Internet Backbone 1990 WWW (Tim Berners-Lee at CERN) 1991 HTML 1993 First GUI WWW Browser Mosaic Browser (Marc Andreesen and Eric Bina)
11 Recall - The Network Era After chaos of Micro Era, organizations converged on Client-Server networked architectures Based on Sun s model introduced in 1982 The Client PC allowed user to have direct access to her own computer The Server housed organizational data
12 Client-Server Architecture Suitable for information management applications Information is stored/published on a server Users sitting at clients generate requests The server responds to the clients requests Each client displays the responses to the user One client may access many servers and one server is accessed by many clients Examples?
13 Client-Server Example Client I want to see UCSC Web Server <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" " <html lang="en-us"> <head> <title>uc Santa Cruz - Welcome</title> <meta http-equiv="content-type" content="text/html; charset=iso "> <meta name="keywords" content="university of California Santa Cruz, UC Santa Cruz, UCSC, UC Campus, Welcome, Home Page">
14 Client Server Example Layers Revealed Client Server Application (Browser): Application IP address of Infrastructure Packet <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" " <html lang="en-us"> <head> <title>uc Santa Cruz - Welcome</title> <meta http-equiv="content-type" content="text/html; Packet Request from Client (IP address of client) Packet <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" " <html lang="en-us"> <head> <title>uc Santa Cruz - Welcome</title> <meta http-equiv="content-type" content="text/html; Infrastructure Packet Internet
15 Client-Server Example Client I want to withdraw cash from my savings account Bank Server Transaction accepted
16 Client-Server Architecture Clients may come and go Servers must be always available!!! 2-tier Architecture
17 Two-tier client/server Server/ Mainframe Local-area network
18 3-tier Client/Server Architecture Many organizational applications incorporate missioncritical databases Need to separate data from the applications that access them Centralized storage Security Fault tolerance Data shared across many applications 3 tiers: 1: Client 2: Application Server 3: Enterprise Data Server (usually on a mainframe)
19 Three-tier client/server Application server Client Enterprise data server
20 3-Tier Client Server Architecture example Client Application Server Clicks, keystrokes Balance $0.50 <head> <title>bank of America Online Banking Accounts Overview</title> <meta name="description" content="bank of America Online Banking - Accounts Overview"> <link rel="stylesheet" type="text/css" href="/easdocs/images/win_ie.css"> <script language="javascript" type="text/javascript" src="/easdocs/ias_js/scripts.js"></script> <script language="javascript" type="text/javascript"> <!-- function hover(ref, classref) { eval(ref).classname = classref; }//--> </script> $0.50 What is Bob s balance? Shared data
21 3-Tier Client Server Architecture example Client Application Server Web Server Application Logic What is Bob s Balance? Common Gateway Interchange Shared data
22 3-Tier Client Server Architecture example Client Application Server Shared data Web Server Application Logic What is Bob s Balance? Database Management System (DBMS) Database Common Gateway Interchange
23 3-Tier Client Server Architecture example Client Application Server Web Server What is Bob s Balance? Java Servlet Application Logic In some implementations Application Logic and Web Server can be put on Different machines. Shared data Database Management System (DBMS) Database
24 Relational Database Customer Alice Bob Charles Balance $527 $0.50 $ Customer Class Silver Bronze Gold
25 DBMS Responsibilities Hide Changes in the Database hardware from the Application Standard operations on the data, including searches, such a search is called a query. Middleware: Separate Database Management from Applications, so that many applications can access the same data. Security, Integrity, Backup, fault tolerance, etc..
26 3-Tier Client Server Architecture in General Client Application Server -Takes input from clients -Decides what to be done next -Decides what shared data to access and manipulates it -Processes shared data -Accept instructions from user -Make requests of server -Display responses of server -Support multiple applications with common data -Protect critical data -Decouple data administration and application administration Shared data
27 Financial institution Customers books4u.com Book distribution centers Consumer Enterprise Inter-enterprise Slide adapted from slides for Understanding Networked Applications By David G Messerschmitt. Copyright See copyright notice
28 Sun Case Jonathan Fook-Lung Hung
29 Java Applets Key feature of Java Applets: chunks of Java code Initially enabled animations on web pages Later used to facilitate e-commerce applications, in cellular phones, etc. Applets are downloaded through the browser Only what and when was needed No need to keep a copy on client! Servlets: Applets that run on Webtop servers
30 Sun N-Tier
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