java qr code generator library free Case Study Component Summary in Java

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Table 6.3 Case Study Component Summary
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Component
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BugAccessorBean ComponentLocator ApplicationMenu DiagnosticApp XSLTFilter
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Purpose
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Communicates with partner web service. Locates components and services. Caches application menu data. Controller servlet for application. Performs XSLT transformation and rendering
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There is one step left in the design process after the application of design patterns and the creation of our class diagrams. This step involves validating our architecture against the use cases. This ensures that the designed application satisfies the requirements. To perform our validation, we employ the use of a
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Case study
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sequence diagram. Sequence diagrams are a type of UML interaction diagram that show objects within the system interacting during the processing of a request. Figure 6.8 is a sequence diagram that shows the application flow for all three of our use cases. The sequence diagram is read from top to bottom beginning with the first arrow, or message. Continuing down, you can see the flow of events between application components. Sequence diagrams may be documented in much more detail, including return values, but this level is sufficient for our purposes. As we move into the implementation section, you can trace each request along three paths through the use case, the sequence diagram, and finally the code. Each object b is an instance of the classes from our class
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an XSLTFilter
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a DiagnosticApp
an ApplicationMenu
a BugAccessorBean
a ComponentLocator
[ action = menu ] service() getInstance()
Object
Use Case 1
message
getMenu()
[ action = detail ] [ machine = amaya ] service()
return message
Use Case 2
[ action = update ] [ machine = amaya] service()
getInstance()
getBeanHome("BugAccessor")
updateBugList("Amaya") Use Case 3 getInstance()
getWebService()
Sequence diagram for design validation
The implementation phase
diagram. Right-pointing arrows c are messages that indicate a method call. The method name is listed above each message. Left-pointing arrows d are return messages.
The implementation phase
With our design completed, we move into the implementation phase. In this section, we list and explain the interesting pieces of code to be found in the case study. As with the other examples in this book, we wrote this case study to illustrate certain concepts. If this were a true production application, some portions of the code would be more robust. For the full source code to this application, go to http://www.manning.com/gabrick/.
Building the controller servlet
The DiagnosticApp component is the controller servlet for our application. It accepts a parameter named action that is submitted on the query string of the client browser (http://wwwcom/DiagnosticApp action=menu). The three possible values for this parameter are listed in table 6.4.
Table 6.4 Possible parameter values for action variable
Value
menu detail update View application menu
Purpose
View detailed information about a specific machine Contact manufacturer and update machine support information
Additionally, the machine name is passed to the servlet as a parameter if the action is detail or update. The DiagnosticApp servlet makes calls to the other business logic components to process the user s request. Once that processing is complete, the results are put into the request object along with the a reference to the appropriate stylesheet. The XSLTFilter (described in section 6.6.5) performs the XSLT processing and renders the output to the user.
Listing 6.1 DiagnosticApp servlet
public class DiagnosticApp extends HttpServlet { ... public void service( ServletRequest req, ServletResponse res ) throws ServletException, IOException {
Case study
try { // If the user requested action is menu, then get the menu. String action = req.getParameter("action"); if ( action.equals("menu") ) { ApplicationMenu menu = ApplicationMenu.getInstance(); Document menuDoc = menu.getMenu(); req.setAttribute( "outputDoc", menuDoc ); req.setAttribute( "stylesheet", config/mydomain/applications/book/menu.xsl" ); } // If the user requested action is update, then have the BugAccessorBean // update the list. String machineName = req.getParameter( "machine" ); if ( action.equals("update") ) { ComponentLocator cl = ComponentLocator.getInstance(); Central BugAccessorHome bHome = point for (BugAccessorHome) locating cl.getBeanHome("examples.chapter6.BugAccessor"); services BugAccessor bugBean = bHome.create(); Document detailDoc Communicates = bugBean.updateBugList( machineName );
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req.setAttribute( "outputDoc", detailDoc ); req.setAttribute( "stylesheet", "config/mydomain/applications/book/bugs.xsl" ); } // If the user requested action is detail, then get the list detail. // for the specified machine. if ( action.equals("detail") ) { SAXBuilder sBuilder = new SAXBuilder(); Document detailDoc = sBuilder.build(new File( "config/mydomain/applications/book/" + machineName + ".xml")); req.setAttribute( "outputDoc", detailDoc ); req.setAttribute( "stylesheet", "config/mydomain/applications/book/bugs.xsl" ); } } ... } ... }
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