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Case Study: A Product Support Center
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private String customerID; // Product fields private List products; private String productID; // Problem fields private List problems; private String problemID; // Problem log fields private List problemLogs;
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Model contains instance variables that represent the state of the application These variables fall into the following categories: I Configuration fields These include the name of the file containing the next available problem ID number, the name of the JDBC driver used to access the database, the database URL, and the database connection object I Customer fields The model supports an alphabetic search for customer names The results of the most recent search are stored in a javautilList of Customer objects This list is exposed as a property and made available with the getCustomers() method In addition, the model has a customerID property, which supplies an implicit ID for several methods that require it I Product fields Like the customer fields, instance variables exist for the current product search results and the current product ID I Problem fields The model has instance variables for the current list of Problem objects and the currently selected problem I Problem log fields Likewise, there s a javautilList for the list of ProblemLog objects associated with the current problem
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// =========================================== // Configuration and database methods // =========================================== /** * Assigns a globally unique problem ID */
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public static synchronized String assignProblemID (String problemIDFile) { String id = null; try { // Read the next available ID BufferedReader in = new BufferedReader( new FileReader(problemIDFile)); id = inreadLine(); inclose(); // Increment it and rewrite the file String prefix = idsubstring(0, 1); int suffix = IntegerparseInt(idsubstring(1)); suffix++; String newID = "0000000" + StringvalueOf(suffix); newID = newIDsubstring(newIDlength() - 7); newID = prefix + newID; PrintWriter out = new PrintWriter( new FileWriter(problemIDFile)); outprintln(newID); outflush(); outclose(); } catch (IOException e) { eprintStackTrace(); } finally { return id; } } /** * Creates a new connection using the currently * specified JDBC driver and URL * @exception SQLException if the connection fails
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Case Study: A Product Support Center
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* or if it already exists */ public void connect() throws SQLException { if (isConnected()) throw new SQLException("Already connected"); // Verify that the driver and URL have been specified if (jdbcDriver == null) throw new SQLException("No jdbcDriver property"); if (databaseURL == null) throw new SQLException("No databaseURL property"); // Load the driver try { ClassforName(jdbcDriver)newInstance(); } catch (ClassNotFoundException e) { throw new SQLException (jdbcDriver + " class could not be loaded"); } // Open the connection con = DriverManagergetConnection(databaseURL); } /** * Closes the current connection */ public void disconnect() { // Close the connection if (con != null) { try { conclose(); } JSP IN ACTION
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catch (SQLException ignore) {} finally { con = null; } } } /** * Returns true if there is an active connection */ public boolean isConnected() { return (con != null); } /** * Returns the jdbcDriver */ public String getJdbcDriver() { return jdbcDriver; } /** * Sets the jdbcDriver * @param jdbcDriver the jdbcDriver */ public void setJdbcDriver(String jdbcDriver) { thisjdbcDriver = jdbcDriver; } /** * Returns the databaseURL */ public String getDatabaseURL() { return databaseURL; } /** * Sets the databaseURL * @param databaseURL the databaseURL */
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Case Study: A Product Support Center
public void setDatabaseURL(String databaseURL) { thisdatabaseURL = databaseURL; } /** * Returns the problemIDFile */ public String getProblemIDFile() { return problemIDFile; } /** * Sets the problemIDFile * @param problemIDFile the problemIDFile */ public void setProblemIDFile(String problemIDFile) { thisproblemIDFile = problemIDFile; }
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The model contains a set of methods that handle data sources The first is assignProblemID(String problemIDFile) This is a class method that reads the next available problem ID from a file, and then rewrites the file with an incremented number The method is synchronized, so the generated IDs are unique There are get and set methods for the problem ID file name2 Database connections are managed with three methods: I void connect() I void disconnect() I boolean isConnected() The connect() method uses the model s JdbcDriver and databaseURL properties to open a JDBC connection to the database These properties are set from context parameters specified in the webxml deployment descriptor The disconnect() method closes the connection, and the isConnected() method exposes a means for testing whether a database connection exists
2 The file name is stored as an instance variable, but the method that uses it is a class method This is why it must be passed as a parameter The reason is the model can be run from the Web or from a command-line test shell The file would likely be in different locations in each case
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