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DEVELOPING A J2ME APPLICATION
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to get the latest quoted price for their favorite stocks or mutual funds by providing the stock or mutual fund ticker symbol. 3.1.2 Requirements analysis After meeting with several business and marketing representatives from the company, a short list of requirements has been developed. The prototype application must comply with the general requirements of our tutorial application. The application must: be easy to use. Users will only be required to enter a stock or mutual fund symbol for a United States investment and get back a price in United States dollars. store the investment symbol, price for the investments viewed. The latest price obtained for one of these commodities can be retrieved out of storage at any time. In order to show how the investment is trending, a maximum of two prices will be stored for each investment. A current and historical price will allow the system to depict how the price for the investment is changing. run on the most ubiquitous small devices of today, which consists of a two-way pager, cellular telephone, and personal digital assistant. require the users to be connected with their device at the time of retrieving new price quotes. store the last quotes retrieved. The user is not required to be connected when looking up already stored quotes. The system will allow the user to store up to two prices per symbol. After analyzing the requirements, it is determined that the prototype will consist of two uses or, more appropriately, use cases. The first use case, ObtainQuote, will provide the user with the ability to obtain a quote and store the quote price and date on the device. A second use case, RetrieveQuote, will allow the customer to pull up the previously retrieved price quotes for any given investment symbol stored in the device. A use case diagram of the system and its uses cases is depicted in figure 3.1.
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ObtainQuote
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SaveQuote Small Device Owning Customer QuoteService ExtractQuote RetrieveQuote
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Figure 3.1 The Investment Quote system is determined to have four use cases. The customer will request to either obtain new investment quotes or retrieve historical quotes. Secondary use cases help in saving or retrieving data from the database. The ObtainQuote use case will also require interaction with an outside QuoteService system.
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INVESTMENT QUOTE APPLICATION REQUIREMENTS
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The ObtainQuote use case will connect to and make use of an outside or third-party quote service to get investment price information. In this system, the third-party quote service is referred to as the QuoteService. Hidden to the user, the ObtainQuote use case will need to save quote information. The SavePrice use case will be responsible for connecting to the small device s persistent mechanism and storing the investment quote data. Similarly, RetrieveQuote will utilize the same persistent storage service to get back data via the RetrievePrice use case.
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In the development of the tutorial application, we examine the implementation of several major components of the system. In particular, we will look at the user interface and event handling, persistent data storage, and networking or input/output means. We design the application around these major components. However, this design will be implemented a couple of times throughout the next two parts of the book. In particular, we will examine the same application implemented under both the MIDP profile and KJava API on top of the CLDC configuration.
Application control We have already determined that there are probably two main uses of the system. One use is to have the customer provide a symbol and have the system obtain a new investment quote while another use is to have a customer provide a symbol and have the system retrieve a historical or already retrieved investment quote from a database that is on the device. To complement the use cases of the system, we decide to set up two general applications.
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