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Analysis And Design.doc


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Analysis And Design.doc

  1. 1. CONTENTS  The Problem  Overview  Terminology  Data Dictionary  Overall System Architecture  Object Model  Dynamic Model  Functional Model  Figures  Overall System Architecture  Object Model  Dynamic Model  Functional Model  Group Information
  2. 2. The Problem The problem in brief can be stated as to develop a web based stock market simulation, which is capable of providing up to date information about the stock market, and the various stocks a user is interested in. It should also include features like • User portfolio management • Provide with stock history The data does not have to be obtained from the actual stock market servers and can be obtained from various web pages that are providing stock data to its users. This would mean that the problem involves extracting data from a web site, by looking at the HTML code of the page. Overview This project develops the software that supports online trading of stocks. The overall design of the project includes objects such as user manager, stock manager, transaction etc. The user portfolio manager maintains the details of the customers that include their personal information. The stock manager maintains information about the stocks where the transaction involves trading of the stocks. Only authorized users have access to use this software and are allowed to carry out transactions like buying and selling of stocks by interacting with the Stock Exchange. The portfolios of the users are update regularly. Security provisions are provided for these user accounts. Terminology The terminology involved is briefly described here: Stock The stock can be defined as the security issued by a corporation that represents ownership. The stocks can be traded in the market, but the trading has to be done confirming to certain regulations laid down by the Government. The place where such trading takes place is called the Stock Market. Each stock is represented by a Symbol, which is unique. With advances in the technology, the stock market has started to migrate into the Personal Computers through the World Wide Web. Ticker A scrolling display of current or recent security prices and/or volume.
  3. 3. Ticker Symbol A system of letters used to uniquely identify a stock or mutual fund. Symbols with up to three letters are used for stocks that are listed and trade on an exchange. Symbols with four letters are used for NASDAQ stocks. Symbols with five letters are used for NASDAQ stocks other than single issues of common stock. Symbols with five letters ending in X are used for mutual funds. Portfolio A collection of investments, all owned by the same individual or organization. Portfolio Tracking Monitoring a collection a stocks, whether held in a real or imaginary portfolio, for the purposes of learning how the prices move or profiting from those movements. Usually done with software or via the Internet. Volume The number of shares, bonds or contracts traded during a given period, for a security or an entire exchange. Stockbroker Broker who deals primarily with transactions involving stock. Shareholder One who owns shares of stock in a corporation or mutual fund. For corporations, along with the ownership comes a right to declare dividends and the right to vote on certain company matters, including the board of directors. Close The price of the last transaction for a given security at the end of a given trading session also called as closing price. Low The lowest price a security or commodity reached in a certain period of time, usually a single trading session (here also called daily low). High The highest price that was paid for a security during a certain time period. Index A benchmark against which financial or economic performance is measured, such as the S&P 500 or the Consumer Price Index. Stock index Index of market prices of a particular group of stocks, such as the S&P 500 and the NASDAQ Composite Index.
  4. 4. Mutual Fund An open-ended fund operated by an investment company, which raises money from shareholders and invests in a group of assets, in accordance with a stated set of objectives. Benefits include diversification and professional money management. Shares are issued and redeemed on demand, based on the fund's net asset value, which is determined at the end of each trading session. A closed-end fund is often incorrectly referred to as a mutual fund, but is actually an investment trust. NASDAQ National Association of Securities Dealers Automated Quotations system New York Stock Exchange (NYSE): The oldest and largest stock exchange in the U.S., located on Wall Street in New York City. Responsible for setting policy, supervising member activities, listing securities, overseeing the transfer of member seats, and evaluating applicants. Data Dictionary Stock Manager Holds Information about stocks like the closing price, the lowest and highest price of a stock on a trading day, the volume of stocks that were traded, the price- earnings ratio, percent yield etc. The customer can trade in the stock market through the stock manager. If the stock manager does not have the information asked be customer it retrieves the same from the Internet. Transaction An agreement between a buyer and a seller to exchange an asset for payment. Or in accounting, any event or condition recorded in the books of account. Portfolio Management Users can set up and manage their own portfolio. Stocks kept in the portfolio are stored in tables that allow users to keep track of their stocks once they login. In addition, when the user buys certain stocks from the simulated stock transactional services, that symbol will automatically be added in the user portfolio. Additional features such as features for calculating profit from stocks will allow users to keep track of stock value and enable them to transact the stocks they have when the stock market is good. HTML (Hypertext markup Language) HTML code of a web page tells the browser the way the page has to be displayed. The data that we are looking for is generally embedded in this HTML format which has to be retrieved and stored.
  5. 5. Server The server gets the data on stocks from the Internet. Once it gets the data, the user can perform the transaction. Each transaction needs to be validated by the server. The server verifies the validity of the transaction. It also validates the user. The server is also responsible for adding a new user and deleting users as and when required. At the end of the transaction, the server removes the stock data. The server also maintains a timer for each transaction for security purposes. Overall System Architecture Click here to view the pictorial view Or use the link %20Architecture.JPG The main sub systems of the system are • User Interface (GUI): The user interface provides a user-friendly graphical environment using which the user will be able to communicate with the server. • Server: The server takes care of the user authentication, modification of the user preferences, the users stock holdings etc. The user transacts with the local database to retrieve the relevant data and also takes care of communicating with the external network. • Database: The local database stores the details about the users and also about the stocks. The user data would be the data like the user login, password, and the current holdings of stock with the user. This part of the database is the User Portfolio Manager. The other part of the database is the Stock Manager, which stores the attributes about the stocks. The attributes of the stocks could be, the symbol, the price, the day’s high and low value of the stock, the volume of the stock, weekly and monthly high and low etc. • Internet and Data Extraction: This part of the system is concerned with retrieving the relevant data from the Internet. The data is obtained from the HTML code of a particular web site, after passing a relevant query to this web site.
  6. 6. Object Model All objects have identity and are distinguishable. The purpose of object modeling is to describe objects. Objects promote understanding of the world and provide a practical basis for computer implementation. So, we break our system into objects that are simpler sub blocks of the entire working system. This is achieved by Object Modeling. It is modeling a system from related but different viewpoints, each capturing important aspects of the system, all required for a complete description. Object modeling groups real life object classes and the relationships between them. The most critical aspect in the design of the object model is the division of the parent or upper layer object classes and their relationships with each other. The child or lower layer constitutes by far a less critical part. The object model represents the static structural “data” aspects of a system. The dynamic model represents the temporal, behavioral, “control” aspects of a system. The functional model represents the transformational, “function” aspects: it uses data structures (object model), it sequences operations in time (dynamic model), and it transforms values (functional model). The object model precedes the other models-namely dynamic and functional, because of its simplicity, stability and independence from application related details. Object model provides the essential communication link between the computer professional and application designers. Click here to view the Object Model Or use the link Here is a brief description of the objects in the presented Object Model. The user interface object allows the user to connect to the server and perform transactions. The user has to provide a valid user name and password to do this. The user will be having options view the stock holdings, change the stocks he/she is interested in, and also to trade the stocks. The server object checks the authenticity of any user during login using the data from the UserProfileManager object. The server object allows the user to trade, i.e. buy or sell any stocks. The Transaction object allows the user to do so after the server passes the symbol name on which the transaction has to be performed and the quantity of the shares to be transacted.
  7. 7. The DataBaseManager object allows the user to retrieve details about a stock. The details could be either the current performance of the stock or could be the performance of the stock during the previous week or month. The DataExtractor object is used to extract the relevant and required data from the Internet using the HTML object. The HTML object uses a query passed by the DataExtractor and then parses the HTML code of the web page to get the data. The Stock object and the StockData object contain the data like the previous closing, last opening, current price, the volume of the stock etc. Dynamic Model The dynamic model describes the aspects of a system that change over time. The dynamic model is used to specify and implement the control aspects of a system. The dynamic model contains state diagrams. An object model describes the possible patterns of objects, attributes, and links that can exist in a system. Over time, the objects stimulate each other, resulting in a series of changes to their states. An individual stimulus from one object to another is an event and this is the most important concept in the dynamic model. One event follows the other forming the flow of processes in the system. The model also tells how the system reacts to an error. The Online Stock Market is an interactive system and hence the dynamic model is an important part of the overall design. Click on the links below to see the Dynamic Models. Figure 1 Or use Figure 2 Or use Figure 3 Or use Here is a brief explanation about the dynamic model presented here is: When the user starts the program, the user is requested to enter a valid user name and a password. If the user is found to be valid the data relevant to the user is retrieved and presented. If the user does not exist in the database he/she is given an option to create an account by providing some information. After the user is created the information is updated in the user database. The user is asked to set his preferences, like the stocks to be displayed, the data to be displayed etc. The user can exit any time during this process.
  8. 8. After displaying the user data, the system waits for the user to enter some thing. Some of the options are shown in the Dynamic Model, Picture 2. The user can either request an update on the current stock holdings, or can research by looking at the stock history. Also the user can also add or delete the stocks of interest for which the system if going to ask for the symbol to be added or removed. If the symbol is valid the user database is updated. If the user wants to either buy or sell a stock, he is prompted to enter the symbol and number of shares to perform the transaction. If the data entered is valid the specified stock for the specified amount is either bought or sold. If either the symbol name is invalid or if the number of shares is invalid, the user is prompted to reenter the data. After performing the required operations, the user database is updated and the current holdings are displayed and the system again waits for the user. In the database manager model (Picture 3) it shows that when the user logs in, his data is retrieved and displayed. If the user hits the refresh button, more recent data about the stocks are retrieved from the data extractor and displayed. Even if the user does not hit the refresh button, after a specified time interval, the system automatically refreshes the stock data with the current values. Functional Model The functional model describes the data value transformations within a system. It is concerned with the flow of data and contains Data Flow Diagrams. A data flow diagram is a graph whose nodes are states and whose arcs are transitions between states caused by events. The functional model hence captures what a system does, without regard to how or when it is done. The functional model is designed on the basis of the input and output of the system. It requires identifying the input/output parameters of the system followed by their computation based on the functions or processes that control them. The functional model thus represents a process-to-process data flow. Click here to see the Functional Model Or use the link The main processes as shown in the functional model are described briefly: • User Authorization process: This process is used to verify whether the user has a valid account with the database. The user has to enter a valid user ID and the correct password. • New user information: If the user does not have an account, an account can be created by picking a user ID and password and by providing some required data about the user.
  9. 9. • Display user portfolio: This process is used to display the user data, which is retrieved from the user database. • Research: The user can research on the stocks on the Internet and can pick which one he/she would like to buy or sell. The research can be based either on the current performance of the stock or the previous history of the stock. • Transaction: Using this process the user will be able to either buy or sell stocks. The user data is updated after this process. • Data extraction: The data extraction process involves passing a query to a predefined web site and parsing the HTML code to obtain the required data. Group Name: nirvana Group members Archana Rao Penukonda Suresh Kumar Paladugu Ravi Kiran Guntupalli Veena Tadimeti Anima Gupta