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Understanding interface-based programming Suppose that you are an architect on the RS team and you are responsible for designing a flexible model for plugging in delivery extensions. As we saw in chapter 14, RS comes with two extensions out of the box: e-mail and file share extensions. As useful as these extensions are, it is unlikely that they will meet all subscription-based distribution requirements. For example, what if an organization wants to automate the reportprinting process by sending reports directly to a printer Instead of enduring the Herculean effort of creating and supporting all possible delivery scenarios out there, you prudently decide to let customers author and plug in their own extensions. What implementation pattern will you choose Obviously, you need to establish some standardization to which other developers will need to conform. Once you ve come up with an easy-to-follow standard pattern, you could use generic code logic to load and execute custom extensions. As a seasoned architect, you set the following high-level design goals for the envisioned extensibility model: It must allow developers to write and plug in their own extensions. The extensibility model shouldn t require an intimate knowledge of how the extension is implemented or what it does for that matter. In other words, as long as the extension adheres to the standard, it can be treated as a black box. The extensibility model should be as robust as possible. For example, it should be able to determine at runtime whether a given custom extension follows the standard design pattern and, if it doesn t, the Report Server will not attempt to load it.

deleteuser deleteweb deletewppack disablessc disablestsisapis email enablessc enablestsisapis enumroles enumsites

CreateAppendElement(xmlEl, firstName", Joe )

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enumsubwebs enumtemplates enumusers enumwppacks extendvs extendvsinwebfarm getadminport getproperty removedrservice renameweb restore setadminport setconfigdb setproperty siteowner unextendvs uninstall upgrade userrole

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Let s now discuss how we can implement the above requirements. To enforce a common standard for report delivery, you can lay out the following rules: Each custom extension type must expose a method that the Report Server will invoke to distribute the report. This method must have at least one argument that the Report Server will use to pass the report notification object. Given the above specifications, figure 15.1 shows how two custom delivery extensions could be implemented. Let s say that the first extension supports report delivery to a printer similarly to the sample that comes with RS, while the second can be used to distribute reports to a Web service. In the first case, you ve decided to encapsulate the delivery logic in a method called Deliver, while in the latter, in a method called Distribute. Once the custom extensions are registered with the Report Server, you can define subscriptions that use these extensions, as we discussed in chapter 14. During runtime, the Report Server will instantiate the appropriate extension and delegate the report delivery to it. Everything looks great! Or does it 15.1.2 Working with interface inheritance Upon further inspection, several issues surface. First, the Report Server has to know beforehand not only the type name of the extension but also the name of the method responsible for the report delivery. One possible workaround would be to save the method name in the configuration file too, but this will present a maintenance issue. Another solution would be to change the specification and stipulate that all delivery methods must have the same name, for example, Deliver. However, this approach

CreateAppendElement(xmlEl, lastName", Doe )

The SharePoint Configuration Analyzer is an unsupported Microsoft application that detects a wide range of configuration errors, and also copies log files, configuration files, and other data to a results folder for further analysis or archiving. Figure 15-31 shows some results, including two configuration errors.

CreateAppendElement(xmlEl, address", 1234 North Street )

Figure 15-31. Running the SharePoint Configuration Analyzer on a SharePoint server checks for and reveals a variety of common configuration problems.

For information about downloading and using this tool, refer to Using SharePoint Configuration Analyzer, in the Administrator's Guide for Windows SharePoint Services. This is available online at http://www.microsoft.com/resources/documentation/wss/2/all/ adminguide/en-us/stswp04.mspx.

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