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Model and Develop the Case Study
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FIGURE 11-3
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A trade as a business process
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11: Case Study: Overview of Securities Trading System
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The ORDERDB database
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application database design, but it is eventually reconciled in terms of function back to the overall design. This design of the trade system ORDERDB, shown in Figure 11-4, meets the constraints of the DBMS, and since it is derived directly from a composite data model, it also satisfies the system requirements. The rules ensure that the physical design is valid and that it follows good practice. During development, no attempt is made to achieve good performance. Rather, the design provides a sound starting point for physical tuning when the design of both database and Java classes is adjusted to achieve performance objectives. The database characteristics can vary depending on the DBMS being used. The key characteristics of many of the popular DBMS engines, such as Oracle, are built according to the following rules:
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Model and Develop the Case Study
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1. Entities Most entities on the composite data model become tables. The key-only entities may be paired with other key-only entities to form junction tables, which can speed up joins. 2. Primary Keys The primary key of each entity becomes the primary key of the corresponding table. Specify a UNIQUE index for the entire primary key. 3. Alternate Keys Each alternate key becomes a UNIQUE secondary index. 4. Foreign Keys Indexing each entity foreign key becomes a secondary NONUNIQUE index. 5. Referential Integrity Make each entity foreign key a FOREIGN KEY for the table, referencing the master of the supported relationship. 6. Other Non-Unique Keys Each other non-unique key becomes a NONUNIQUE index on the corresponding column(s). . Exclusive Relationships If a detail entity has two or more mutually exclusive masters:
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n Provide foreign key indexes to support each relationship as defined in
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Rule 4.
n The foreign key columns for the relationships should all be defined as
NULLS ALLOWED.
n Maintenance of exclusivity must be handled by program.
Developing the Trading System
The trading system is a browser-based user interface that provides trading functionality that is, the ability to send trade orders (even baskets of stocks) and view customer account and trade order requests to BNA. Written in Java with JEE, it provides the customer with an integrated, platform-independent method for accessing account information and submitting and viewing orders via the Internet or a private network. All trading functionality is accessible via a single menu page, which uses a frameset with a header, footer, and a navigation frame on the left to expose the functionality in the right side mainframe (no pun intended). Figure 11-5 shows the main trading frameset. On the left side of the trading page is a frame that exposes the functionality that is currently available for trading stocks, bonds, mutual funds, as well as baskets and multiple orders along with some basic operational functionality used to maintain accounts and other external information. The main trading application page and operations page can be depicted as use case diagrams, as shown in Figures 11-6 and 11-7.
11: Case Study: Overview of Securities Trading System
FIGURE 11-5
Trading page main menu frameset
Browse existing orders to cancel or replace them. Provide HTML pages to create, maintain, execute, and browse baskets of stocks. It includes a pricing feature to calculate the current price of the basket. Baskets can be based on established indices or created for each firm.
Provide HTML pages to capture details for single order entry of stocks, options, bonds, mutual funds, and post facto executions. Provide HTML page to capture details for multiple order entry of stocks.
FIGURE 11-6
Trading Page functionality as a use case
Model and Develop the Case Study
FIGURE 11-7
Operations page functionality as a use case
Table 11-3 describes the use case task goals and scenarios.
Sequence Diagrams
Sequence diagrams are models of business processes that represent the different interactions between actors and objects in the system. Each process has a process owner and goals (such as cycle time, defect rate, and cost) and consists of a set of business activities (in sequence and/or in parallel). Figure 11-8 depicts the sequence of a trade order being placed by a customer as it moves through the JEE application server for verification and onto the trade process router to the mainframe and then to the securities exchange, where the actual trade is executed. After a confirmed execution, each of the front-end processors is notified, and ultimately the customer is availed of the completed order and price.
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