ProgramvaruUtveckling för Stora System F2
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1 ProgramvaruUtveckling för Stora System F2 Lecture 2 First hour requirements engineering Second Hour webservers and Tomcat 1
2 A nice video Stop after two minutes The Big Dig celling collapse The Big Dig ceiling collapse occurred on July 10, 2006, when a concrete ceiling panel weighing 3 tons (2722 kg) and measuring 20 by 40 ft (6.1 by 12.2 m) fell in Boston's Fort Point Channel Tunnel. The panel fell on a car traveling on the two-lane ramp connecting northbound I-93 to eastbound I-90 in South Boston, killing a passenger and injuring the driver. The collapse caused a section of the tunnel to be closed for almost a full year. WHY? 2
3 Why? The bolts were too short, and the epoxy used to glue the bolts into the concrete was not up to standard. The state (citing the existence of an ongoing criminal investigation into the tunnel ceiling collapse) Deficiency reports that would have shown problems flagged during initial work on the tunnel. (BROKEN TRACEABILITY) Why requirements are so important? 3
4 Requirements Engineering Methods and techniques for Identification Documenting Validating Evolving Tracing Requirements throughout the project focus on what a system should do - rather than how the system should be implemented The main goals of requirements engineering To describe the customers expectations on the product It is a main source of contract between the customer and the development company Basis for implementation Reference for verification Description of the finished product Requirements Code Documentation Test cases 4
5 Requirements important tasks Understand the problem - and the requirements Find the (hidden and critical) requirements Prioritize and choose between the requirements Document your requirements- PROPERLY Create and maintain traceability Validate your requirements Perform change management Remember, you are going to build software PRODUCTS which will live for several PROJECTS!!!!. Requirements how to 5
6 Requirements Specification goal documents the customer s requirements to the system, such that developers know exactly what is required from the system quality in requirements specification Correctness Completeness Verifiable Unambiguous Consistent Traceable Organized Motivated Requirements division 6
7 Requirements numbering to allow things to be traceable to requirements: running numbers pre-fixed by section number why is this a good idea? same structure on chapters as SRS state which requirements are still valid and which are removed from SRS do NOT change requirements in SRS - remove the old one and add a new one Working with the SRS SG develops a template and gives instructions on how requirements should be written Every UG analyze and develop requirements for their service SG puts requirements together and fixes terminology Make an interaction table and check that all interactions are specified At least 2 Use Cases per function/service (see SRS) TG acts as informal reviewers SVVS depends on SRS => synchronization problems? 7
8 Some thoughts about the SRS Try to think about all requirements i.e. try to be complete Normal ways of using the system Non-normal ways of using the system Wrong ways of using the system Interections between different main functions of the system both normal and non normal Develop requirements in several steps involve many group meme but get a consistent set of requirements Inspections and other ways of getting feedback important RE is NOT easy You can't just ask customers what they want and then try to give that to them. By the time you get it built, they'll want something new. 8
9 Tomcat and Webservers Outline The product Webservers Tomcat MySQL basic information about the concepts. You may have to find out more information yourself too (as in any project). The history of Webservers and Tomcat Started as Jakarta Tomcat in 1999 (initial release) Tomcat started off as a servlet reference implementation by James Duncan Davidson, a software architect at Sun Microsystems. He later helped make the project open source and played a key role in its donation by Sun Microsystems to the Apache Software Foundation. The Apache Ant software build automation tool was developed as a side-effect of the creation of Tomcat as an open source project. Most important components Catalina servlet container Coyote connector that supports the HTTP 1.1 protocol Jasper JSP Engine Cluster manage large application and do load-balancing 9
10 The product New time reporting system Web-based Take a look at epuss and the time reporting instructions in the course to understand what kind of system we have in mind Improvements compared to current procedures/systems are OK (and of course welcome) Generalization possible (i.e. usable outside the course) Functionality we require Time reporting For project members to report time (per phase, per document, etc) Report generation Summarize time spent per person, phase, document, etc For project leaders and other managers Administration Define projects Add/remove project participants etc Creating charts about the time used in the project Time used per phase, per document per member etc. Project burn down charts, per phase, per document and member) 10
11 Example of a project burn down chart HTML 11
12 HTML Forms Server responses to user data 1. The server displays a page with a form 2. The user enters data in the form and presses a submit button or similar 3. The server analyzes the data that was entered in the form 4. The server displays a new page with a new form 5. GOTO 2 12
13 Submit On the server: abstract class HttpServlet Provides an abstract class to be sub-classed to create an HTTP servlet suitable for a Web site. A subclass of HttpServlet must override at least one method, usually one of these: doget, if the servlet supports HTTP GET requests dopost, for HTTP POST requests doput, for HTTP PUT requests dodelete, for HTTP DELETE requests init and destroy, to manage resources that are held for the life of the servlet getservletinfo, which the servlet uses to provide information about itself [ doc/servletapi/javax/servlet/http/httpservlet.html] 13
14 Printing the next page PrintWriter out = response.getwriter(); out.println("<html>"); out.println("<head><title> the title</title></head>"); out.println("<body>"); out.println(formgenerator.namerequestform()); out.println("</body></html>"); 14
15 HttpSession (Store data during a user session) How to do it in Eclipse EE New project: File -> New -> Dynamic Web Project New Servlet: File -> New -> Servlet Possible to run a server inside Eclipse Export.war-file: File -> Export 15
16 Project Explorer in Eclipse 16
17 How to store data? In Java Collections? Loose data when server is restated In files? Depends on file system In Database Management Systems (DBMS)? Made for this Atomicy, consistency, isolation, durability Different views Data stored in tables (relational databases) 17
18 SQL Structured Query Language Language for managing data in a relational database MySQL is one system for this Some examples create table Respondents (name varchar(100), primary key (name)); create table Cities (Cityname varchar(100), population integer, primary key (Cityname)); insert into Respondents (name) values('martin Host'); select * from Respondents; 18
19 Connecting to the database in Java (jdbc) 19
20 You can do a lot with the ResultSet rs Prepared statemements We recommend that you use prepared statements E.g. SG can investigate how this works. 20
21 Design of databases Important in order to avoid duplicated values, inconsistencies, Taught in courses on Databases Talk to Jesper if you need more help Read more Tutorial/tomcat-7-with-eclipse.html doc/servletapi/javax/servlet/http/httpservlet.html doc/servletapi/javax/servlet/http/httpsession.html
22 Questions? 22
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