Web Project

1
Distributed Software Development

• Web Project
• Project Design Overview

2
Overall project design

• Design specifications for
• Database (ER model)
• PostgreSQL database schematics
• User interface definitions
• Error handling
• Menu hierarchy
• Basic JSP construction and EJB component logic
• Activities underway
• EJB to database and EJB to JSP interfacing
• Database testing and optimizing
• User interface graphical design
• Gaining proficiency in technologies used

3
Database model
4
So what is this schema about?

• Database features
• Multiple project interdependencies (cronological
  and hierarchical)
• Multiple task dependencies (cronological and
  hierarchical)
• Personnel and other resources can be deployed to
  more than one task or project
• Projects and tasks can have more than one leader,
  and one person can be a leader to more than one
  task or project
• Personnel can be assigned to more than one group
  of resources
• Record keeping for meetings, risks and
  contingencies, project baselines etc.

5
Menu hierarchy definitions

• Menu contains 7 main units
• Project overview
• Resource maintenance
• Project planning
• Task maintenance
• Project control and auditing
• Overall project reports
• Web billboard
• Menus are enabled depending on users project
  role and access privileges
• Users can assume the following project roles
• Client
• Project leader
• Task leader
• Personnel

6
Menu hierarchy definition - submenus

• Project overview
• Schedule overview (Gantt, CPM, PERT and table
  view) access ALL
• General project info access ALL
• Tasks overview access Project leader, task
  leader, client
• Planned cost access Project leader, task
  leader
• Risks and contingencies - access ALL
• Project baselines - access Project leader, task
  leader
• Resource maintenance
• Resource group maintenance access Project
  leader
• Resource maintenance access Project leader
• Human resources
• Miscellaneous resources

7
Menu hierarchy definitions submenus II

• Project planning
• General project information and planning
  access Project leader
• General project description - access Project
  leader
• Task maintenance
• Tasks setup
• Recurring tasks setup
• Gantt, PERT, CPM (critical path method) and table
  tasks overview
• Cost planning
• Project baseline setup
• All functions are project leader and task leader
  privileged
• Project control and auditing
• Tasks control and review
• Schedule auditing
• Cost auditing
• Resource control and review
• Meetings
• Project change-log
• All functions are project leader privileged

8
Menu hierarchy definitions submenus III

• Overall project reports
• Project completion status
• Project completion date estimate
• Critical tasks status
• Indefinite factors
• All functions are project leader privileged
• Web billboard
• View billboard access ALL
• Enter task information access Task leader
• Enter project information access Project
  leader

9

• Template layout

10
Enterprise Java Beans and Java Server Pages

• Java Server Pages
• Dynamic HTML code generation
• Session control using JSP session object (each
  user one session per browser)
• Passing information between pages using POST
  method
• Information passed on to EJB tier
• EJB tier passes information on to the database
• Enterprise Java Beans
• Methods and classes for communication with the
  database tier
• Reusable code for frequently used database
  operations (authorization check-ups, cost
  calculation etc.) enabling faster and more
  reliable development

11
Error handling

• JavaScript
• Errors made at entry time (illegal values entered
  to GUI fields)
• Enterprise Java Beans and JSP
• Fatal server error or database error
• Database entries are handled in transactions
• Data entries and operations are stored into a
  file
• Attempts to store illegal values into the
  database
• Appropriate error message is returned and the
  user redirected to a page containing the error
  message
• A link is made to the previous page so the
  attempted values can be corrected and entered
  once again