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Describe each routine in one or two sentences at the top of the routine If you can t describe the routine in a short sentence or two, you probably need to think harder about what it s supposed to do. Difficulty in creating a short description is a sign that the design isn t as good as it should be. Go back to the design drawing board and try again. The short summary statement should be present in virtually all routines except for simple Get and Set accessor routines.

truly garbage . At this point, the second call to Collect forces another garbage collection, which reclaims all of the memory occupied by the now-finalized objects . For some applications (especially server applications that tend to keep a lot of objects in memory), the time required for the garbage collector to do a full collection that includes generation 2 can be excessive . In fact, if the collection takes a very long time to complete, then client requests might time out . To help these kinds of applications, the GC class offers a RegisterForFullGCNotification method . Using this method and some additional helper methods (WaitForFullGCApproach, WaitForFullGCComplete, and CancelFullGCNotification), an application can now be notified when the garbage collector is getting close to performing a full collection . The application can then call GC.Collect to force a collection at a more opportune time, or the application could communicate with another server to better load balance the client requests . For more information, examine these methods in the .NET Framework SDK documentation . Note that you should always call the WaitForFullGCApproach and WaitForFullGCComplete methods in pairs because the CLR handles them as pairs internally . Finally, the GC class offers two static methods to allow you to determine which generation an object is currently in:

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Figure 3.2 The Visual Studio Command Prompt knows the paths to various handy .NET tools. One of them is MSBuild.

Int32 GetGeneration(Object obj) Int32 GetGeneration(WeakReference wr)

Document parameters where they are declared The easiest way to document input and output variables is to put comments next to the parameter declarations. Here s an example:

The first version of GetGeneration takes an object reference as a parameter, and the second version takes a WeakReference reference as a parameter . The value returned will be between 0 and GC.MaxGeneration inclusively . The following code will help you understand how generations work . The code also demonstrates the use of the GC methods just discussed .

public void InsertionSort( int[] dataToSort, // elements to sort in locations firstElement..lastElement int firstElement, // index of first element to sort (>=0) int lastElement // index of last element to sort (<= MAX_ELEMENTS) )

using System; internal sealed class GenObj { ~GenObj() { Console.WriteLine("In Finalize method"); } } public static class Program { public static void Main() { Console.WriteLine("Maximum generations: " + GC.MaxGeneration); // Create a new GenObj in the heap. Object o = new GenObj(); // Because this object is newly created, it is in generation 0. Console.WriteLine("Gen " + GC.GetGeneration(o)); // 0

Endl ine comments are discussed in more detail in Endline comments and their problems, earlier in this section.

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To use MSBuild from the command line, you have to write the full path for the executable or add it to your System Paths variable. But if you have Visual Studio installed, you can use the Visual Studio Command Prompt, which knows the path to MSBuild. You launch the Visual Studio Command Prompt from the Windows Start menu (see figure 3.2). As a small workout in MSBuild, you ll perform the same tasks as you did previously with NAnt. Write another captivating one-liner:

This practice is a good exception to the rule of not using endline comments; they are exceptionally useful in documenting input and output parameters. This occasion for commenting is also a good illustration of the value of using standard indentation rather than endline indentation for routine parameter lists; you wouldn t have room for meaningful endline comments if you used endline indentation. The comments in the example are strained for space even with standard indentation. This example also demonstrates that comments aren t the only form of documentation. If your variable names are good enough, you might be able to skip commenting them. Finally, the need to document input and output variables is a good reason to avoid global data. Where do you document it Presumably, you document the globals in the monster prolog. That makes for more work and unfortunately in practice usually means that the global data doesn t get documented. That s too bad because global data needs to be documented at least as much as anything else.

Automatic Memory Management (Garbage Collection)