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Case Study: A Product Support Center
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// Verify that file exists File file = new File(fileName); if (!fileexists()) throw new IllegalArgumentException (fileName + " not found"); // Run the subshell Systemoutprintln("Including " + fileName); new Shell(thismodel, new FileInputStream(file))run(); Systemoutprintln("Done including " + fileName); } catch (IllegalArgumentException e) { Systemoutprintln(egetMessage()); } catch (IOException e) { Systemoutprintln(egetMessage()); } } /** * Shows the public methods available in the model */ protected void methods() { // Get the list of declared methods Class cls = Modelclass; Method[] methods = clsgetDeclaredMethods(); Systemoutprintln(methodslength + " methods:"); // Print the list for (int i = 0; i < methodslength; i++) { Method method = methods[i]; String name = methodgetName(); Class[] parameterTypes = methodgetParameterTypes(); StringBuffer sb = new StringBuffer(); sbappend(name); sbappend("("); for (int j = 0; j < parameterTypeslength; j++) { Class parmClass = parameterTypes[j];
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if (j > 0) sbappend(","); sbappend(parmClassgetName()); } sbappend(")"); String s = sbtoString(); Systemoutprintln(" " + s); } } /** * Invokes the problemLogSearch method */ protected void problemLogSearch(String line) throws Exception { String id = getArgument(line); modelproblemLogSearch(id); } /** * Invokes the productProblemsSearch method */ protected void productProblemsSearch(String line) throws Exception { String id = getArgument(line); modelproductProblemsSearch(id); } /** * Invokes the productSearch method */ protected void productSearch(String line) throws Exception { String arg = getArgument(line); modelproductSearch(arg); } }
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To get an idea of how useful the shell can be, let s see it in action When you invoke the Shell class, its main() method creates an instance of Shell and passes it a new instance of Model If you type the help command, you see the following help text:
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P:\classes\test>java -classpath testShell SHELL> help Invoke a method by name, or any of the following commands: quit - exits from the shell help - displays this help text methods - displays a list of model methods include <filename> - executes an included file SHELL>
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To begin with, let s see what Model methods are available to call Type the methods command to see this:
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SHELL> methods 33 methods: connect() customerProblemsSearch(javalangString) customerSearch(javalangString) disconnect() getProblemID() newProblem() productProblemsSearch(javalangString) productSearch(javalangString) addProblemLog(comlyricnotesupportmodelProblemLog) assignProblemID(javalangString) getCustomer() getCustomerID() getCustomerProducts() getCustomers() getDatabaseURL() getEmployee(javalangString) getJdbcDriver() getProblem() getProblemIDFile() getProblemLogs() getProblems() getProduct() getProductID() getProducts() isConnected()
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problemLogSearch(javalangString) setCustomerID(javalangString) setDatabaseURL(javalangString) setJdbcDriver(javalangString) setProblemID(javalangString) setProblemIDFile(javalangString) setProductID(javalangString) updateProblem(comlyricnotesupportmodelProblem) SHELL>
How did this information get there Looking at the Shell method that implements the methods command, you see it calls the getDeclaredMethods() method on the Model class, and then prints the resulting array This shows a list of every method you can call from within the shell During development, as you add new methods to the model, you see them automatically added to this list In the Shell class, all you need to add is an if statement in the run() method and a subroutine that simply invokes the model method and prints the results As you see shortly, you don t even need to do this for the property getter and setter methods Back to the shell session You know you can t do much without a database connection, so let s call the model method that reports whether a connection is established
SHELL> isConnected(); false SHELL>
When the shell sees a command that starts with is or get, it interprets that as a call to one of the model s property accessor methods The shell handles all such interpretation in its doGet() method doGet() uses JavaBeans introspection to get a list of getter methods from the Model class It then compares the method name from the command line to the names of the getter methods for a match When the shell finds a matching method, it invokes the method and returns the result A similar approach is used for setter methods Any command beginning with set is dispatched to the doSet(String line) method, which extracts the argument from the command line, goes through the same introspection to find the appropriate set method, and invokes the method with the command line argument This makes for a natural way of getting and setting model properties When you called the shell s isConnected() method, it passed the call on to the model s isConnected() method, which reported no connection occurred To create a connection, you know the model needs a JDBC driver name and a database URL Set these properties, and then call the connect() method:
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