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You may be wondering why the same information is printed twice. The simple answer is that the message is printed twice because it is propagated to both the named logger and the root logger for handling. Both loggers have printed the message through their respective appenders. We can switch off this feature by setting the additivity flag of the named logger to false.

That s a perfectly acceptable solution and a clean way to do things, but the code base is larger for it. With .NET 4, C# now supports optional and named parameters, providing a cleaner method for completing the same task (see Listing 1 2). Listing 1 2. Handling the Connections in One Method with Optional Parameters /// <summary> /// Returns a SQL connection object using the default "CMS" connection if none is provided. /// </summary> public SqlConnection GetConnection(string conStr="CMS") { return new SqlConnection(ConfigurationManager.ConnectionStrings[conStr].ConnectionString); } SqlConnection conn = GetConnection(); // uses the default connection string SqlConnection conn2 = GetConnection("CMS2"); // uses the optional parameter

The default is blank The property where Ant will store the return code of this command You can use this attribute only if failonerror is false and fork is true (the details follow this table) The default is blank..

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log4j.additivity.com.apress.logging.log4j=false Consult the Logger Object section of this chapter for more detail on this feature.

I Note You could accomplish the same task with a nonoptional string parameter and check its state within the method; however, I think you ll agree that the whole solution is simpler and more elegant with the optional parameter. A very large portion of software programming in most languages is devoted to defensive programming : checking boundaries, value existence, and so on. Optional methods essentially remove lines of defensive code and thereby reduce the number of areas a bug can hide.

Table 7-2. The <java> Task s Attributes (Continued)

Apache log4j allows us to configure the logging framework programmatically without specifying any system property. As mentioned earlier, the properties-style configuration files are parsed with the org.apache.log4j.PropertyConfigurator object; we can use the same object within an application to read and parse the configuration file. For example, in the program in Listing 2-4, we could have used the following to configure the logging framework: public { } where args[0] is the name of the configuration file supplied as a command line parameter. This will also configure the framework correctly by reading any configuration file specified. The only important thing to note about this method is that ideally the configuration should be loaded at the entry point of the application, such as in the main() method. Otherwise, the application might be loading the configuration information several times and slow down performance. For example, if you want to initialize log4j within a servlet, the best way to do that is inside the init() method of the servlet, which will be called only once. Likewise, the initialization will take place only once. In a more simplistic situation, the Logger object can assume a very basic configuration through the org.apache.log4j.BasicConfigurator class. BasicConfigurator.configure() This instruction configures the root logger to a level of DEBUG and assigns org.apache.log4j. ConsoleAppender as the default appender with the conversion pattern %-4r[%t]%-5p%c%x - %m%n. By default, log4j is configured to propagate the logging request up through the logger hierarchy. static void main(String args[]) PropertyConfigurator.configure(args[0]);

If you have a method that has multiple optional parameters, you can provide names for the parameters you do want to supply in the form (name : value), as shown in Listing 1 3. Listing 1 3. A Method with Required and Optional Parameters /// <summary> /// Test method with optional parameters.

Tells Ant to start a process that will live after the Ant process has finished. To use this you have to set fork to true and can t use error, input, output, result, or timeout. The default is false. The time in milliseconds that Ant should wait before stopping this command. You should use this only if you set fork to true. The default is null.

Note If we use the default setting in an application, and we obtain our own named logger but do not use

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