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Some Final Thoughts
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Knowing OOP and its associated terms means that you know the ingredients of the various patterns. You won t know how to apply the ingredients properly, as the patterns will cover that aspect. But when the term virtual or inheritance is used, you ll know what that encompasses with respect to the .NET platform. When a pattern is explained and implemented, you can pick apart the different OOP techniques used and learn the abstract idea behind the pattern. This makes it possible to see beyond the individual keywords and start thinking in strategies.
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Logging, Errors, and Test-Driven Development
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he purpose of this chapter is to show you how to log, generate exceptions, and do test-driven development (TDD). These three topics aren t generally covered in books on patterns or object-oriented design, but are extremely important for understanding OOP. It s important to cover these topics early in this book, because these concepts make an application stable, robust, and if an error does occur reproducible. The worst thing that can happen to an application is finding a bug that cannot be tracked or reproduced. If you implement the three topics from this chapter in your application, those problems cannot happen.
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Implementing Logging Management
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You use logging to allow an application to indicate what it s doing, and to specify where any problems are. The simplest way for an application to indicate what it s doing is to use the method Console.WriteLine. However, the simplest way is also the worst way, because it assumes that there s a console to write to. If the application were a component executing in the context of an application server, a console wouldn t be available. The best way to implement logging is to use log4net. The log4net library is a port from the Java log4j library, and is available at http://logging.apache.org/log4net.
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A Simple Log4net Example
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You need to know about two implementation details when using log4net: changing the source code and changing the application configuration file. The changes in the source code require writing method calls that check if logging is enabled, and subsequently making the logging calls. The application s configuration file modifications enable or disable the logging. Following is an example implementation of how you might use log4net to perform a simple debug logging operation:
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CHAPTER 2 LOGGING, ERRORS, AND TEST-DRIVEN DEVELOPMENT
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using System; using log4net; [assembly: Config.DOMConfigurator(Watch=true)] public class MainApp { public static void Main(string[] args) ILog log = LogManager.GetLogger( "2.Logging"); if (log.IsDebugEnabled) log.Debug("Hello world"); } } Let s walk through this. You reference the namespace log4net so you can use the log4net assembly. You must add the attribute [assembly: . . .] to enable the log4net listener. You use the listener to capture log4net messages that are then output to the logging outputs defined in the application configuration. If you don t activate the listener, logging isn t activated, and any logging messages made are lost. You can add the attribute to the main application, or to an assembly that s loaded by the main application. The location doesn t matter; it only matters that the attribute is executed. You make logging calls by calling methods on the ILog interface. You call the method LogManager.GetLogger to get an interface instance of ILog. The parameter "2.Logging" represents a logging configuration that s loaded from the application configuration file. Loading a logging configuration loads and defines logging levels. In the source code, the property IsDebugEnabled only returns true if the loaded configuration file has enabled the debug logging level. Otherwise, false is returned. If true is returned, then you can call the method log.Debug to indicate a logging message at the debug level. You can make logging method calls anywhere in the source code. However, only the configuration file determines whether or not logging output is generated. The configuration file determines which data is logged, and where that logged data is generated. In big-picture terms, the developer adds all the logging hooks, but the administrator determines what s logged and where. Following is an example modified application-configuration file that contains a minimal number of configuration entries that you can use to generate logging output: < xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="log4net" type="System.Configuration.IgnoreSectionHandler" /> </configSections> <appSettings> </appSettings>
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