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Study the conventional solution first In this step, you sketch out, design, and even prototype the conventional solution. We followed this route in most chapters in parts 2 and 3. First, we studied the conventional solution and focused on repeated patterns of code. While illustrating the conventional solution helped you appreciate the AspectJ solution that followed, the main purpose was to help you understand the AspectJ design needed for a better solution. The idea is to first sketch the code tangling and code scattering, and then modularize it. Once you become reasonably experienced at this, you may reduce the emphasis on this step or even eliminate it. Limit the implementation By limiting the solution to only modules that currently need the functionality, you eliminate the impact both positive and negative on other modules. We discussed this approach in chapter 7 (resource pooling) and chapter 9 (thread safety in Swing applications). The goal is to leave as much of the system unaffected as possible and reduce the testing effort required. To do this, you can either use pointcuts such as within() to specify only join points in the modules you want to weave, or you can configure your build system to include only those modules. Let it loose Once you are comfortable with the solution and its impact, you should modify the pointcuts or build configurations that have been limiting the applicability. For example, instead of restricting resource pooling to only certain modules, you lift those restrictions to let it crosscut system wide. This way, if a new module joins the system, it starts benefiting from the aspects right away.

4

Sinatra calls itself a DSL for quickly creating web applications. It s not a framework in the typical sense, and many Sinatra developers prefer to refer to it as a library that offers HTTP deployment functionality. In essence, however, it s a very lightweight web application framework that lets you either add HTTP functionality to existing apps or build new ones from scratch as simply as possible. Sinatra was initially developed solely by Blake Mizerany, and first appeared in 2007, but it was not until early 2009 that its popularity exploded, and now there are many developers responsible for it. To install Sinatra, you can just run gem install sinatra or visit the project s homepage at http://sinatrarb.com/.

When you re done, run the following code for cleanup:

[December, 31]

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This section provides a technical description of the various index access methods; it is designed to be used as a reference for discussions in these books involving analysis of execution plans. Later in this chapter, I'll describe an index optimization scale that demonstrates how you can put this knowledge into action. If you want to follow the examples in this section, rerun the code in Listing 3-1 to re-create the sample tables in our Performance database along with all the indexes. I'll be discussing some access methods to use against the Orders table that are structured as a heap and some that are structured as a clustered table. Therefore, I'd also suggest that you run the code in Listing 3-1 against another database (say, Performance2), after renaming the database name in the script accordingly, and commenting out the statement that creates the clustered index on Orders. When I discuss an access method involving a clustered table, run the code against the Performance database. When the discussion is about heaps, run it against Performance2. Also remember that Listing 3-1 uses randomization to populate the customer IDs, employee IDs, shipper Ids, and order dates in the Orders table. This means that your results will probably slightly differ from mine.

SELECT O1.empid, CONVERT(VARCHAR(7), O1.ordmonth, 121) AS ordmonth, O1.qty AS qtythismonth, (SELECT SUM(O2.qty) FROM dbo.EmpOrders AS O2 WHERE O2.empid = O1.empid AND O2.ordmonth <= O1.ordmonth) AS totalqty FROM dbo.EmpOrders AS O1 GROUP BY O1.empid, O1.ordmonth, O1.qty;

To avoid these problems, Visual Studio automatically configures WPF and Windows Forms projects to run in 32-bit mode. If you open the project properties and go to the Build tab, you ll see a Platform target: setting, and for GUI projects, this defaults to x86, as Figure 19-6 shows. This makes the application always run as a 32-bit process, even on 64-bit Windows. This is unlikely to cause problems for most user interfaces it s pretty unusual for a GUI to process such large volumes of data that 64-bit processing becomes a necessity. GUI programs are more likely to use ActiveX controls than to have massive memory requirements, so this conservative default makes sense. (And if you re writing an unusual application that really does need a multigigabyte address space, you can always change this project setting.)

When Basic Firewall is enabled on an external interface in the Routing And Remote Access console, that interface blocks all unsolicited traffic from entering your network. However, you might want to restrict all unsolicited requests except those intended for a specific internal service such a Web server. In this case, you can create packet filters that block all traffic from the external network except those requests destined for the specific service you choose.

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