International Journal of Computer Engineering and Technology (IJCET), ISSN 0976 – 6367(Print), ISSN 0976 – 6375(Online) Volume 2, Number 2, May- July (2011), © IAEME 25 REUSABLE WEB DESIGN PATTERNS FOR ONLINE DERIVATIVES TRADING Prof. P. Niranjan Dr. Jayadev Gyani P.Shireesha Head, Dept.of CSE , Head, Dept.of CSE , Assistant Professor, Kakatiya Institute of Jayamukhi inistitute of Kakatiya Institute of Technology & Science, technology & sciences Technology & Science, Warangal , A.P. INDIA Narsmpet,A.P,INDIA Warangal , A.P. INDIA npolala@yahoo.co.in jayadevgyani@yahoo.com rishapakala@yahoo.co.in ABSTRACT Design patterns are gaining popularity because they support modifiability and flexibility of designs. Design patterns are solutions to frequently recurring problems in design. Reverse engineering of source code primarily focuses on the software architecture. Understanding software architecture in terms of design patterns simplifies the process of identifying some key properties such as coupling, flexibility and maintainability. This paper presents a novel approach to extract design patterns using structural metrics of object-oriented programs. It involves two steps. In the first step, structural metrics are extracted from the source code. In the second step, these metrics are matched with the properties of structural design patterns of Gang-of-Four to identify a design pattern. Our approach is demonstrated by extracting design patterns from a Java program using our pattern extraction tool. Keywords: Design pattern, extraction, structural metrics, matching 1. INTRODUCTION Online share trading mainly deals with selling and buying of shares electronically. Online share trading is categorized into two types. One deals with the equity trading and the other deals with derivatives trading. Our focus is on derivatives trading. Online derivative trading involves share broker, stock exchange and customers. Share broker is responsible for opening the new account for the user and providing the interface to the user for trading. Stock exchange maintains a list of shares along with their prices. Companies that are registered with the stock exchange can only be traded. Most often, this list expands to involve new companies. Derivative trading is of two types. One is future trading and the other one is option trading. A derivative contract expires at a specified date in a month after which it will not exist. In both the cases the number of shares to be traded is fixed and it is called a “lot size”. For performing trading, necessary fund can be transferred to the trading account using online fund transfer. Whenever the necessary amount is to be withdrawn it can be done through payment request. We propose six design patterns for online derivative trading namely derivative search, derivative lot size, derivative buy/sell, International Journal of Computer Engineering and Technology (IJCET), ISSN 0976 – 6367(Print) ISSN 0976 – 6375(Online) Volume 2 Number 2, May – July (2011), pp. 25-33 © IAEME, http://www.iaeme.com/ijcet.html IJCET © I A E M E