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The Business Delegate pattern is employed to simplify client access to a Uses Business particular application service. In this Delegate pattern, a Business Delegate object acts as a proxy between application clients and the service. This is depicted Complex in figure A.6. This pattern is related to Service Interfaces the more general Proxy and Adapter software patterns and hides the complexity of locating and accessing a Figure A.6 The Business Delegate pattern complicated business API from the client. Often, the Business Delegate utilizes a Service Locator of some kind to locate a particular service and connect to it. In J2EE, Business Delegates are often dependent objects used by servlets and EJBs. For example, an adapter class might provide access to an internal ERP system for querying order status. This adapter might locate the ERP system using JNDI parameters and engage in a complicated interaction with the remote system. All this is transparent to the objects that use the adapter. The Business Delegate pattern is demonstrated by the JAXM examples in chapter 4, which use it to shield application components from the complexities of interacting with remote applications via SOAP.

To solve this problem, rst do whatever is necessary to back out of the failed installation (click OK, Exit, Cancel, or whatever else seems appropriate). Then try to nd the executable le for the installer. It will not be named Setup or Install (because if it were, it would not have evaded the detector), but it will be an .exe le. When you nd it, right-click it in Windows Explorer and choose Run As Administrator. Supply your administrative credentials, and let the installer run.

The same technology that detects an installation process also recognizes when you re about to update or remove a program. So you can expect to see UAC prompts for these activities as well. Rules have exceptions, of course. The following kinds of programs are not flagged by installer-detection technology:

64-bit executables Programs that have a RequestedExecutionLevel embedded in their application manifests.

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To enable the application s business logic and presentation logic to integrate with the data model extensions, you will require either a set of configuration files that describe the extensions or code that can dynamically discover the extensions Data Architecture Scalability If you can partition your data horizontally, you will be able to scale out your data storage In the case of SQL Azure, if you decide that you need to scale out, you should be able to move all of an individual tenant s data to a new SQL Azure instance Note: Partitioning data horizontally, also known as sharding, implies taking some of the records in a table and moving them to a new table Partitioning data vertically implies taking some fields from every row and placing them in a different table.

Moreover, it is possible, although uncommon, for a program to install itself in an unprotected, per-user location. For example, SyncToy 1.4 for Windows Vista, a PowerToy program available free at http://www.vista-io.com/0401, installs itself in %LocalAppData%\SyncToy, a location in the profile of the person installing the application. The setup program also avoids detection by installer-detection technology, making SyncToy a rare case a program that you can install without administrative credentials. (For an interesting description of the how, if not the why, of creating a per-user installer, see How Do I Build a Standard User Package, in the blog post at http://www.vista-io.com/0402.)

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A.2.3

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If you launch a setup program as a standard user and supply the name and password of an administrative account, and if the setup program requires a system reboot to complete, you might not be able to complete the installation unless you log back in (after the reboot) as that administrative user, rather than under your own standard-user account. Installer routines that include a reboot typically record post-reboot instructions in the registry key HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce. The value of the RunOnce key is, as the key name suggests, run one time and then discarded. The hitch is that RunOnce values are executed only when an administrator logs on. If you log on as a standard user, the RunOnce instructions are ignored, and your setup process may appear to hang. The solution is to log off and log back on as an administrator. To forestall problems of this kind, you might want to adopt the practice of elevating your own account to administrative status, using the Manage Accounts section of Control Panel, before you begin installing applications. Afterward, if you re more comfortable running as a standard user, you can return to Control Panel and demote yourself.

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