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Figure 3-14. Business objects subclassing BusinessListBase BusinessListBase supports the undo capabilities implemented for BusinessBase; the two base classes work hand in hand to provide this functionality. As shown in Figure 3-15, the two objects that list read-only data for the user inherit from ReadOnlyListBase. This base class provides the support objects need for retrieving data from the database without the overhead of supporting undo or business rule tracking. Those features aren t required for read-only objects. The ProjectInfo and ResourceInfo classes don t inherit from any CSLA .NET base classes. As you ll see in s 7 and 8, they must be marked with the <Serializable()> attribute, but they don t need to inherit from a special base class just to expose a set of read-only properties. Next, there s the RoleList object, which is a read-only list of name/value data. Although this could be implemented using ReadOnlyListBase, 6 will describe the NameValueListBase class, as shown in Figure 3-16. This class provides a better alternative for building name/value lists and is designed to make it as easy as possible to create read-only lists of text values, so it s ideal for building the RoleList class.

Figure 3-16. RoleList subclassing NameValueListBase Finally, there are the two custom authentication objects: PTPrincipal and PTIdentity. Figure 3-17 shows these objects along with their CSLA .NET base classes.

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namespace StockTraderSecure { public class CustomUsernameTokenManager : UsernameTokenManager { public CustomUsernameTokenManager() { } public CustomUsernameTokenManager(XmlNodeList nodes) : base(nodes) { } protected override string AuthenticateToken(UsernameToken token) { // return the password, in this sample, the password is the same value // as the user name, but in upper case // In a production application, the password would be retrieved // from an external storage, such as a SQL Server database or // an LDAP directory. return token.Username.ToUpper(); } } } The previous code uses a straightforward algorithm to obtain the user s password. It simply converts the username to uppercase. If you want the user to be authenticated successfully, you will need to build a client application that passes the same value as a username and password, with the second one containing only uppercase characters. The last step is to modify the web.config file to specify the name of the user-defined class that will handle user authentication. The <securityTokenManager> section must be located under the <security> tag of the <microsoft.web.services3> section. Listing 6-8 shows a fragment of the web.config file that enables the service to use a custom security token manager.

If you don t have any particular requirement in mind, you can support the oldest possible SDK release in order to target the widest possible audience Otherwise, we recommend choosing at least the latest major release, which at this point is 22 The SD Card and Skin settings aren t really a consideration with our SQLite focus, so at this point leave them at the defaults The remaining aspect of your virtual device concerns the additional hardware this AVD will mimic This includes many things that really won t impact our SQLite development, such as GPS and accelerometer devices But several of the hardware options are worth considering The Cache partition size parameter will govern the fraction of on-board storage on the device available to applications and the phone s user (as opposed to Android and the system binaries).

Figure 3-17. Objects supporting custom authentication PTPrincipal inherits from Csla.Security.BusinessPrincipalBase, ensuring that it implements the System.Security.Principal.IPrincipal interface and also that it will work with the data portal, as implemented in 4. A required property from the IPrincipal interface is Identity, which

It s common to find phones and tablets with 4GB, 8GB, and even 16GB or more of onboard memory, and a good fraction of this is available to the Cache partition If you plan to build applications with large SQLite databases, you should set this parameter to help you stay under the likely device ceilings your application would encounter in the wild The Maximum VM application heap size option sets the limit for the amount of heap allocation an Android application can take before it is killed by the system This will impact your SQLite development when dealing with larger items allocated on the heap The most likely culprits will be large result sets that are allocated as cursor objects (which we ll discuss later in this chapter) This defaults to 16MB.

provides a reference to a .NET identity object in this case, PTIdentity. The PTIdentity object inherits from ReadOnlyBase. It exposes only read-only data, so this is a natural fit. All of these classes will be implemented in s 17 and 18. During that process, you ll see how to use the CSLA .NET framework to simplify the process of creating business objects.

Listing 6-8. Fragment of the web.config File <securityTokenManager> <add type="StockTraderSecure.CustomUsernameTokenManager" namespace="http://docs.oasis-open.org/wss/2004/01/oasis- 200401-wss-wssecurity-secext-1.0.xsd" localName="UsernameToken" xmlns=""/> </securityTokenManager>

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