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There are two ways to filter a logging request. One is to perform level-based checking against a Logger or Appender object, and the other is to attach a Filter object to the Appender objects. Level-based checking is limited to comparing the level of a logging request with the designated level of the corresponding Logger and Appender objects. A Filter object, however, can check a logging request against any application-specific criteria. We can write any sort of Filter object we want and add it to a filter chain of the Appender object. The filters get executed sequentially in the chain, and depending on the approval or disapproval of the logging request, the log messages are processed. The level-based filtering that the Logger and Appender objects apply is simple in principle. If a logging request falls below the level of the Logger and the Appender object, the logging request is discarded. This is useful. But what happens if we want only logging messages belonging to a certain level or levels to print and the rest to be discarded For example, we might want only messages with levels between DEBUG and WARN to be printed. If we set the logger level to DEBUG, the logger will print all the messages up to the level FATAL. This is the situation in which org.apache. log4j.varia.LevelRangeFilter comes into play.

Now that you ve built the page-message server control, it s time to create the skin files that the control uses. As mentioned earlier, UserControl skin files are placed under the Skins folder of your web application. Inside the Skins folder, you should have subfolders that match the directory structure of your App_Themes folder as shown in Figure 4-9.

android:layout_margin="0px" android:src="@drawable/snes_x0" android:layout_y="63px" android:layout_x="223px"/> <ImageButton android:id="@+id/btn_Y" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#00000000" android:layout_margin="0px" android:src="@drawable/snes_y0" android:layout_x="174px" android:layout_y="99px"/> <!-- A/B --> <ImageButton android:id="@+id/btn_A" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#00000000" android:layout_margin="0px" android:src="@drawable/snes_a0" android:layout_y="99px" android:layout_x="267px"/> <ImageButton android:id="@+id/btn_B" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#00000000" android:layout_margin="0px" android:src="@drawable/snes_b0" android:layout_x="223px" android:layout_y="141px"/> </AbsoluteLayout>

Figure 4-9. As shown earlier in the chapter, subfolders in the Skins folder mimic the Themes in the App_Themes folder. You may look at the directory structure and, thinking that it looks a bit repetitive, wonder why you can t simply put your control skins in the Themes folder. ASP.NET does not allow any files, other than .skin and .css files for Themes to be placed in the App_Themes folder. Hence the reason why you need to build out the separate directory structure. You mimic the App_Themes directory because you use the theme information from the page to find the appropriate skin, for example, /Skins/<ThemeName>/<UserControlSkin>.ascx. You can see the code used to build the path to your skin file in the LoadSkin function of the SkinnedWebControl abstract class. Over the course of the next few sections, you ll build the UserControl skin files for the page-message control. Figure 4-10 depicts how these controls will display in the browser when they are completely finished.

Error checking only works when you determine if a settings is valid before casting it into the target data type, so it s harder to implement for complex data types. For example, if your application requires a valid GUID (Globally Unique Identifier) for some operation, then you would have to implement error handling instead of error checking to ensure it returns a valid GUID: '********************************************************************* Public Shared ReadOnly Property MyGuidWithErrorHandling() As Guid Get Try If _MyGuid = Nothing Then _MyGuid = _ New Guid(AppSettings("MyGuid")) Catch ex As Exception 'Error occured so set a default value _MyGuid = New Guid("{05F8B079-5367-42a8-B97F-6C72BAC4915C}") End Try Return _MyGuid End Get End Property When you implement exception handling in your configuration properties, you should use a variable to cache the property value because it keeps the exception handling to a minimum. Notice that an exception only occurs the first time you access the property. On subsequent calls, the MyGuid variable contains a value so the property does not attempt to reload the value from Web.config. Now, my views on error handling come from my experiences, and so far I have had no issues with leaving error handling and error checking out of my strongly typed configuration classes. It is a matter of preference, so you will have to see what works best for your situation.

With LevelRangeFilter, we can specify the lower range and the upper range of logging levels that the logging framework should approve. LevelRangeFilter has the configurable bean properties listed in Table 5-1. Table 5-1. Bean Properties in LevelRangeFilter