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Marks the property for inclusion in the personalization framework. As such, changes to the property are automatically saved and retrieved on a userby-user basis. This attribute also allows you to mark the property as having a specific scope (Shared or User) and whether the data should be considered sensitive or nonsensitive. Marking the property as sensitive lets the Web Parts Framework know that it should restrict the export of that setting or display a sensitive data-export message to the user. The determination to display a message or restrict export is based on the ExportMode property of the Web Part containing the sensitive data. Marks the property so it will be picked up and displayed by the PropertyGrid EditorPart. If you ve marked an item as being a shared scope item in the Personalizable attribute, then the PropertyGridEditorPart only displays the property when the page is in shared scope mode. Allows the PropertyGridEditorPart to display a user-friendly name for the property. Allows the PropertyGridEditorPart to display a description of the property when the user hovers the mouse over the property name.

You can use these attributes to define personalizable properties for UserControl-based Web Parts and custom Web Parts alike. Now that you know how to define personalizable properties, let s take a look at the UserControl based Web Part implementation.

} The meat of the preceding example is in the format() method. You may decide to do a lot more with this custom layout. For example, you might want to make the indent character or the set of logging information configurable. At the moment, only the level, method name, and logging messages are printed. Making the information to be published configurable will add a lot more value.

In the traditional x86 Linux compilation process, a developer has a set of C/C++ programs and a Makefile to build a final executable. The basic skeleton of a Makefile looks like this: # Makefile Skeleton # Object files OBJS = file1.o file2.o.... # Header files INC = -Ifolder1 Ifolder2 ... # Libraries and paths (used when linking) LIB = -lc -lm -Lpath1 -Lpath2 ... # Main target all: $(OBJS) @echo Linking.. gcc -o myapp $(OBJ) $(LIB) # Compile C files %o:%.c @echo Compiling $<... gcc -c $< $(INC) The values OBJS, INC, and LIB (for objects, includes/headers, and libraries, respectively) are called variables. The all and %o entries are called targets. Variables have a value separated by an equal sign (=).

Implementing the IWebPart interface is by no means a difficult task, but that still doesn t mean you want to continually implement it for each Web Part you make. Simple as it may be, repetition tends to make things real old, real quick. So, as part of this example in building UserControl-based Web Parts, you ll also learn how to create a base class that implements the IWebPart interface. You can then use the base class to quickly build UserControl-based Web Parts without having to continually reimplement the IWebPart interface. We ll start by looking at the WebPartUserControl base class and then move on to the actual UserControl implementation.Any user control can participate in the Web Parts Framework by means of the GenericWebPart, but only user controls that implement the IWebPart interface can do so gracefully. As such, you should make it a priority to implement the IWebPart interface in your UserControl so it can seamlessly participate in the Web Parts Framework.

Listing 7-20 is the entire code listing for the WebPartUserControl base class. For the most part, the class consists of simple property implementations for the IWebPart interface, but pay careful attention to MustOverride functions and the default values for the class fields:

Listing 7-20. WebPartUserControl Base Class Imports System.Web.UI.WebControls.WebParts Public MustInherit Class WebPartUserControl Inherits UserControl Implements IWebPart '*************************************************************************** Public MustOverride Function DefaultCatalogIconImageUrl() As String Public MustOverride Function DefaultDescription() As String Public MustOverride Function DefaultSubTitle() As String Public MustOverride Function DefaultTitle() As String Public MustOverride Function DefaultTitleIconImageUrl() As String Public MustOverride Function DefaultTitleUrl() As String '*************************************************************************** Private _WebPartData As GenericWebPart Private _CatalogIconImageUrl As String = DefaultCatalogIconImageUrl() Private _Description As String = DefaultDescription() Private _SubTitle As String = DefaultSubTitle() Private _Title As String = DefaultTitle() Private _TitleIconImageUrl As String = DefaultTitleIconImageUrl() Private _TitleUrl As String = DefaultTitleUrl() '*************************************************************************** Public ReadOnly Property WebPartData() As GenericWebPart Get Try If _WebPartData Is Nothing Then _WebPartData = WebPartManager.GetCurrentWebPartManager( _ Page).GetGenericWebPart(Me) End If Return _WebPartData Catch Return Nothing End Try End Get End Property '*************************************************************************** Public Property CatalogIconImageUrl() As String _ Implements IWebPart.CatalogIconImageUrl Get Return _CatalogIconImageUrl End Get Set(ByVal value As String) _CatalogIconImageUrl = value

In this chapter, we have examined how to extend the existing log4j framework to write our own application-specific logging components. The plug-and-play nature of log4j makes it easy to integrate custom components into the existing framework. The default capability of log4j is versatile and meets most of the routine requirements in logging activity. However, you might venture to extend the existing framework should you really need it. This chapter provides a guideline for implementing custom logging components to use with log4j. The next chapter presents a complete log4j example using the concepts discussed so far.