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The developer community actively debates the performance of exception handling . Some people claim that exception handling performance is so bad that they refuse to even use exception handling . However, I contend that in an object-oriented platform, exception handling is not an option; it is mandatory . And besides, if you didn t use it, what would you use instead Would you have your methods return true/false to indicate success/failure or perhaps some error code enum type Well, if you did this, then you have the worst of both worlds: The CLR and the class library code will throw exceptions and your code will return error codes . You d have to now deal with both of these in your code . It s difficult to compare performance between exception handling and the more conventional means of reporting exceptions (such as HRESULTs, special return codes, and so forth) . If you write code to check the return value of every method call and filter the return value up to your own callers, your application s performance will be seriously affected . But performance aside, the amount of additional coding you must do and the potential for mistakes is incredibly high when you write code to check the return value of every method . Exception handling is a much better alternative . However, exception handling has a price: Unmanaged C++ compilers must generate code to track which objects have been constructed successfully . The compiler must also generate code that, when an exception is caught, calls the destructor of each successfully constructed object . It s great that the compiler takes on this burden, but it generates a lot of bookkeeping code in your application, adversely affecting code size and execution time . On the other hand, managed compilers have it much easier because managed objects are allocated in the managed heap, which is monitored by the garbage collector . If an object is successfully constructed and an exception is thrown, the garbage collector will eventually free the object s memory . Compilers don t need to emit any bookkeeping code to track which objects are constructed successfully and don t need to ensure that a destructor has been called . Compared to unmanaged C++, this means that less code is generated by the compiler, and less code has to execute at runtime, resulting in better performance for your application . Over the years, I ve used exception handling in different programming languages, different operating systems, and different CPU architectures . In each case, exception handling is implemented differently with each implementation having its pros and cons with respect to
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Most software projects fall behind. Surveys of estimated vs. actual schedules have shown that estimates tend to have an optimism factor of 20 to 30 percent (van Genuchten 1991).
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Figure 8-5. Click the icon to select the range you wish to import.
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20 Exceptions and State Management
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// Private attributes private $_mErrors = 0; private $_mHaveData = 0; // Class constructor public function __construct() { // Check if we have new user or editing existing customer details if (Customer::IsAuthenticated()) $this->mEditMode = 1; $url_base = substr(getenv('REQUEST_URI'), strrpos(getenv('REQUEST_URI'), '/') + 1, strlen(getenv('REQUEST_URI')) - 1); $url_parameter_prefix = (count($_GET) == 1 ' ' : '&'); $this->mCustomerDetailsTarget = $url_base; if ($this->mEditMode == 0) $this->mReturnLink = str_replace($url_parameter_prefix . 'RegisterCustomer', '', $url_base); else $this->mReturnLink = str_replace($url_parameter_prefix . 'UpdateAccountDetails', '', $url_base); if (isset($_GET['Checkout']) && USE_SSL != 'no') $this->mReturnLinkProtocol = 'https'; // Check if we have submitted data if (isset ($_POST['sended'])) $this->_mHaveData = 1; if ($this->_mHaveData == 1) { // Name cannot be empty if (empty ($_POST['name'])) { $this->mNameError = 1; $this->_mErrors++; } else $this->mName = $_POST['name']; if ($this->mEditMode == 0 && empty ($_POST['email'])) {
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After this lesson, you will be able to
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From the latter, we can offer a tip for the ambitious readers:
The Module Manager is used to administer not only the modules themselves, but also modules associated with each menu. In Joomla, a menu represents an organizational element, much like a category, that holds the list of menu items. However, a menu doesn t actually display anything the presentation is left to a module associated with it. When a new menu is created, a module for menu display is automatically created and linked to the menu. When you open the Module Manager, you will see a display list of all of the modules activated in the system, as shown in Figure 5-23.
C12620245.fm Page 390 Wednesday, June 9, 2004 4:53 PM
Description Represents a connection to an Access database. Inherits from the SqlDataSource control but throws an exception if you attempt to set the ConnectionString and ProviderName properties. Use the DataFile property to point to the actual MDB file. The control uses the Jet 4.0 OLE DB provider to connect to the database. Works with the XML representation of a DataSet object. The XML data can be specified as a string or through a filename. You can t bind this control to a DataSet object not even programmatically. The class features methods to retrieve the corresponding DataSet object and set schema information. Although XML-based, the control supports only the tabular interface and can be bound only to list controls. Mainly used to display XML data in read-only scenarios, the control also supports editing of the underlying XML data. Allows binding to a custom .NET business object that returns data. The class is specified by name through the TypeName property. The control allows developers to structure applications using a three-tier architecture and still take advantage of the ASP.NET 2.0 declarative data binding model. The class is expected to follow a specific design pattern and include, for example, a parameterless constructor and methods with a wellknown behavior. Represents a connection to an ADO.NET data provider that returns SQL data, including data sources accessible through OLE DB and ODBC. The name of the provider and the connection string are specified through properties. Do not use this class to connect to an Access database.
Leases are obtained via the GetLifetimeService method, which is declared as a static member in the System.Runtime.Remoting.RemotingServices class or as an instance member in MBR objects. Once a lease has been obtained, the Renew method can be called to increase the lease life. The lease can be directly renewed by any class that has a reference to the MBR object, including a client. The following example shows the CountClient example class constructor updated to create a remote instance of the Server class and then renew the lease for 5 hours:
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Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177 Generating Documentation with RDoc . . . . . . . . . . . . . . . . . . . . . . . . 177 RDoc Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 Debugging and Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 Exceptions and Error Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 Catch and Throw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 The Ruby Debugger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 The Philosophy of Test-Driven Development . . . . . . . . . . . . . . . . . . 191 Unit Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193 More Test::Unit Assertions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 Benchmarking and Profiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 Simple Benchmarking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 Profiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Table A-2. Matrix Populated with Row and Column Values
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