LYU9901-Travel Net

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LYU9901-Travel Net

• Supervisor Prof. Michael R. Lyu
• Students Ho Chi Ho Malcolm
• Lau Chi Ho Arthur
• (Presentation on 29-02-2000)

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Outline

• Progress on first term
• Progress on second term
• Current Progress
• Future Plans

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Work Done in 1st Term

• Set up an online web application - TravelNet on a
  NT web server
• Implement different functions of TravelNet using
  Java Servlet and HTML

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Flight Search

• Search Flights on preferences of users
• Type of Search One-way
• Principle Call Airline Manager of each airline
  to query and access its own database for
  information on flights

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Travel Shop

• Selling of travel related accessories such as
  luggage, map, guide book, etc
• Principle A shop basket system which records
  items bought and initiates the payment system
  when checkout.

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Travel Guides

• Providing textual information on Cities covered
  by TravelNet
• Principle pure HTML pages

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Membership

• Require users to register first before using our
  services for better management and promotion
• Allow the change of personal information after
  login
• Principle Maintain an user account database and
  login verification system

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Security

• Necessary for user login and payment
• Consideration Convenience and compatibility in
  browser environment
• Use of SSL between browser and web server

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Work done in this term

• Payment Gateway
• Enhancement of Online shop
• Enhancement of Flight Search

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Payment Gateway for TravelNet

• To be a more realistic system
• Simulate payment in a secure way
• In this part
• Description of communication between merchant and
  Payment Gateway (PG)
• Performance measure of a payment transaction

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Communication method

• Asymmetric key encryption on a TCP connection.
• Receiver use its own private key to decrypt
  message.
• Sender use receivers public key to encrypt
  message.
• Keys with 512 bit-length
• Hard to decrypt for hackers even with public key
• Merchant fill in client object and issue a start
  operation

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Performance Threaded Model
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Performance Non-Threaded Model
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Enhancement of Online Shop

• Dynamic generation of shopping item pages
• Allow easy maintenance

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Enhancement of Flight Search

• Implementation of Round-Trip Search
• Display of search result
• shown more complete information
• sort result by time

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Current Progress

• Implementing Itinerary Management System
• Investigating CORBA Integration
• Investigating JSP

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Itinerary Management

• Maintain Users Flight Itinerary
• Allow users to reserve flights eventually
• Basic Functions
• View items
• Add items
• Delete items
• Reserve items to Airline

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Itinerary Management(2)

• Will be finished soon so as to finalize the
  system for CORBA integration

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CORBA Integration

• CORBA - general standard on developing
  distributed programs
• Refer to CSC5110 for details!

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CORBA Integration(2)

• Why CORBA in TravelNet?
• Existence of distributed component
• e.g. Airlines Databases on Flights
• Current Approach Airline Manager resides on
  TravelNet to be called, which lacks parallelism
  increase the load

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CORBA Integration(3)

• CORBA Approach Airline Manager resides on each
  airline server, to increase parallelism and
  decrease TravelNets server load
• More benefits the use of Object Activation
  Daemon(OAD) for better resources allocation

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CORBA Integration(4)

• Challenge
• the integration of CORBA is not simple
• CORBA is commonly used in Applets and Application
  but not Servlet
• Tools
• Visibroker for Java

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Introduction to JSP

• Todays Web sites want to display dynamic content
  based on user and session.
• Mixing the "static" content of HTML files with
  "directives" for accessing or generating dynamic
  content.
• Java Server Pages provide server-side scripting
  support for generating web pages with combined
  static and dynamic content.

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Displaying dynamic content

• Common Gateway Interface (CGI)
• Active Server Pages (ASP)
• Java Servlets Java Server Page (JSP)

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JSP features

• Combines the worlds of HTML and Java Servlet
  programming
• Similar to HTML pages with new tags to control
  the generation of dynamic content
• Pre-compilation of JSP to Servlet which is
  responsible for generating dynamic pages
• Reside in application server memory (pre-load OR
  1st access)

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Why use JSP?

• Platform independent
• Fast Response
• Reusability nature with Java classes or Java
  Beans

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JSP Content

• Standard HTML Tags for scripting in the Java
  language.
• Tags like
• ltjspuseBeangt Locates or instantiates a Beam
  with a specific name and scope
• lt code fragment gt Contains a code fragment
  valid in page scripting language
• lt expression gt return expression value to
  output stream (client browser).
• JSP will finally be compiled to Servlets to
  access Beans

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Compilation of JSP

• .jsp file will be compiled to be a Servlet
• Auto compile on
• the first request of a .jsp file
• the first request after changes on a .jsp file
• No compilation is needed if there is no update
• Generate output (HTML) by Servlet in memory
• Can be pre-loaded

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• Request from browser to JSP of HTTP server
• Servlet request the Bean
• Bean request information from back-ends
• JSP response requested information to browser

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Simple Example
Request http//host/Time.jsp Output on Client
Browser ?
TIME JSP 183520
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Future Plans

• Finalize the existing system
• Integration of CORBA
• Enhancement to the system, e.g JSP
• Other possible features depends on time

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END