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13.1.2 Loose coupling Several design patterns are based on loosely coupled objects. A loosely coupled system refers to a system where the objects and components aren t directly dependent on one another. Loosely coupled objects are connected through an interface; the dependent class uses the interface to communicate to the concrete services. The opposite of a loosely coupled system is a tightly coupled system. Figure 13.1 shows a tightly coupled application Calls Class A Class B where ClassA directly calls ClassB. There s no way to replace or edit ClassB without recompiling and changing the system. Figure 13.1 In a tightly coupled applicaTightly coupled systems are hard to test, tion, the classes are directly referencing change, and maintain because of the dependeneach other. This makes the classes depencies between the components. It s also harder to dent on each other and makes it harder to build tightly coupled systems in teams and to split replace classes and layers. the systems into separate parts or domains. In a loosely coupled system, ClassA doesn t directly depend on ClassB. Instead, it uses a contract or an interface that defines the coupling. Figure 13.2 shows how ClassA depends on an interface, in this example, IService. This interface is used by both ClassB1 and ClassB2, which can be hosted in the same solution or in another

for(int index = 0; index < numberLines; index++){

Created, maintained, and supported the build environments using ANT/PERL scripting for development, integration, and staging Identified, set up, and supported key infrastructure requirements for the development and testing teams Installed update source control systems on different platforms Provided support for production systems

gdrawLine(lines[index][0], lines[index][1], lines [index][2],

lines[index][3]);

Figure 13.2 In loosely coupled systems, the dependent class uses an interface to communicate with its services. This arrangement allows for easier updates of the services, even during runtime, and a clear separation of layers in the application.

for(int index = 0; index < numberRectangles; index++){

gdrawRect(rectangles[index][0], rectangles[index][1],

rectangles[index][2], rectangles[index][3]);

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one. ClassA doesn t know anything about the implementation of ClassB1 or ClassB2. You can edit or replace ClassB1 or ClassB2 and even add new objects that implement the IService interface without recompiling ClassA. Changes to the IService interface would require that you modify all classes. This is where planning and specification become important. Building loosely coupled systems tends to involve more planning but it does allow for easier management. Loosely coupled systems are modular and simple to test. Because the objects don t directly reference one another, you can isolate them for unit-testing. This testing method is also known as white-box testing. Unit-testing is focused on testing the object itself and not how it interacts with other objects. This approach allows for a more agile development process, and you can apply practices such as test-driven development (TDD), where you start writing the unit-tests before you implement the object itself. The opposite of white-box testing is black-box testing, where you test the whole system without any knowledge of the internals of the system.

Figure 77 The lines application When the user clicks the Browse button, the program reads in the + document and displays the lines and rectangles described in that document, as shown in Figure 78

Figure 78 Drawing lines and rectangles as indicated in an XML document The lines application works as planned The code for this application, linesjava, appears in Listing 77, and the XML document it reads in, +, appears in Listing 78 Listing 77 linesjava import commsxmlParseException;

Sr Systems Engineer, Twinn Software, Aliso Viejo, CA 6/2002 9/2004 Developed front-end applets that could be used in a web browser and could generate charts of real-time quotes by reading the values from the corresponding database Middleware development with servlets and JSPs that performed custom analytics on the data reading from the database or from the real-time updated stream Middle tier development followed J2EE standards Developed and customized a content management system using Drupal The system supported an e-commerce-based web site using OSCommerce with LAMP extension Developed an HSBC Payment Gateway for e-commerce using servlets Developed applications for concurrency, XML parsing, XML validation, and report generation Sr Software Architect, SystemsPro Corp, Mission Viejo, CA 2/2000 6/2002 Developed new web software applications and dynamic web sites Had high-phased interaction with the client, translating needs into technical requirements, selecting the best implementation method and hands on development that included coding, GUI, database development, implementation, and integration with existing systems Developed coding standards using Java, J2EE, EJB, Swing, XML, JSP, and MYSQL Developed object-oriented C++ components and displays using JavaScript and HTML Developed e-commerce systems using OSCommerce, developed custom shopping carts, developed custom extensions to existing e-commerce shopping cart systems, and integrated with third-party payment gateways Served as project coordinator leading several projects, defining project proposals, and setting and managing project budgets Education BS Information Technology, California State Polytechnic University, Pomona, CA

import commsxmlDocument;

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