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Every application typically has some sort of frequently accessed static reference data. This data is usually very small and typically used for data normalization purposes. Let s return to the Hawaiian Shirt Shop website and look at an example. For each shirt displayed in the Hawaiian Shirt Shop web page, you might wish the customer to be able to specify the following criteria about the shirt they want to buy: Shirt personage type (men, ladies, boys, girls) Shirt size type (small, medium, large, extra large) Shirt material (cotton, silk, wool) As you can see, the data listed is fairly static, and it s applied across all shirts. All shirts will have a size and a material (admittedly not wool). This data can be considered static, because it s unlikely that it would ever be changed once it s defined. (Hawaiian shirts are unlikely to suddenly start being made in platinum.) Figure 14.1 shows a page of the website where that data can be selected. The customer can browse shirts that are designed for men or ladies, and for a particular shirt they can choose the size or material (style). As you can see from figure 14.1, the web page represents the static material (style) and size data with drop-down lists, whereas the personage type is represented as a hyperlink that will perform a search for different shirt types. For now we ll focus on the two drop-down lists (material and size). The first question you re probably asking is, Where and how do we represent this data Let s take a look at how this could be done using each of these technologies:

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="True"> <Services> <asp:ServiceReference Path="StarbucksService.asmx" InlineScript="true" /> </Services> </asp:ScriptManager>

All of the constructors take a Collection of failed keys as an argument. The failedKeys argument can contain all of the names of the preferences that failed validation or just the first key, or it can be null. It is your decision as the portlet author to decide what makes the most sense with your portlet application. The portlet can check the ValidatorException that is thrown by the store() method on an instance of PortletPreferences for failed keys:

Sellers post an item on ActionBazaar. Items are organized into searchable and navigable categories. Bidders place bids on items. The highest bidder wins.

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The default implementation provided by CSLA .NET is permissive. This means that by default, all users are allowed to read and write to all properties and to execute all methods. However, if one or more roles are allowed to read, write, or execute, all other roles are denied access. Alternately, you can choose to deny access to specific roles, in which case all other roles continue to have access. Not only does each object enforce its rules but the rules are exposed publicly to the rest of the application. This is primarily so a UI developer can enable and disable UI controls to give the user visual cues about what she can and can t do. The IAuthorizeReadWrite interface in the Csla.Security

In extending the AspectJ solution to address authorization, we use the worker object creation pattern described in chapter 8. As with authentication, AspectJ enables you to add authorization to the system without changing the core implementation. In this section, we develop a reusable aspect that enables you to add authorization to your system by simply writing a few lines for a subaspect. 10.6.1 Developing the solution To recap, using JAAS to implement authorization involves routing the authorized call through a class that implements either PrivilegedExceptionAction or PrivilegedAction, depending on whether the operation throws checked exceptions. As you saw in section 10.5, the conventional solution requires the coding of both classes implementing PrivilegedAction and their invocations. The worker object creation pattern takes the pain out of this process. Without this pattern, we would have to implement classes for each operation that needs authorization. We could still use AspectJ to provide around advice to intercept each of the operations separately and to create and execute the corresponding, hand-written action objects through Subject.doAsPrivileged(Subject, PrivilegedAction, AccessControlContext), or Subject.doAsPrivileged(Subject, PrivilegedExceptionAction, AccessControlContext). Now, with the use of a worker object creation pattern, instead of writing a class for each operation that needs authorization, we simply write an aspect that advises all corresponding join points of such operations to autocreate worker classes and execute them through Subject.doAsPrivileged(). The result is a real savings in the amount of code we have to write, since the concern is modularized within just one aspect. Listing 10.16 shows the base aspect that implements the authorization concern in addition to authentication.

In this example, the constructor takes a series of integer values and initializes all the member variables based on these parameters. When the constructor finishes, the Box object exists and the values have been initialized. When DisplayBox( ) is called in Main( ), the values are displayed. Try commenting out one of the assignments and running the program again. You ll find that each member variable that isn t assigned to by you is initialized by the compiler to zero. Integer member variables are set to zero if you don t otherwise assign them. Remember that value types (such as integers) must be initialized; if you don t tell the constructor what to do, it sets innocuous values.

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