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In this chapter we covered a lot of ground; we examined quite a few aspects of cloud table storage. We saw how to access data in the cloud and worked through quite a few hints and tips to use when working with cloud table storage data access. There are many useful tools available to you, such as Fiddler 2, LINQ, and REST. Storing your data in the cloud would be useless if you couldn't alter it or remove it, so we covered this aspect of data storage next. We saw how to update data in buckets (a useful technique with cloud storage) and covered some best practices. Finally, we looked at relational storage in cloud table storage, which is definitely an option for some projects.

The following code shows a full program, including class MyData and extension method Average declared in class ExtendMyData. Notice that method Average is invoked exactly as if it were an instance member of MyData! Figure 7-21 illustrates the code. Classes MyData and ExtendMyData together act like the desired class, with three methods. namespace ExtensionMethods { sealed class MyData { private double D1, D2, D3; public MyData(double d1, double d2, double d3) { D1 = d1; D2 = d2; D3 = d3; } public double Sum() { return D1 + D2 + D3; } } static class ExtendMyData Keyword and type { public static double Average(this MyData md) { Declared static return md.Sum() / 3; } } class Program { static void Main() { MyData md = new MyData(3, 4, 5); Console.WriteLine("Sum: {0}", md.Sum()); Console.WriteLine("Average: {0}", md.Average()); } } Invoke as an instance member of the class } This code produces the following output: Sum: 12 Average: 4

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An external method is a method that does not have an implementation in the declaration. Often the implementation is in a language other than C#. External methods are marked with the extern modifier and do not have an implementation in the class declaration. The implementation is replaced by a semicolon. Keyword public static extern int GetCurrentDirectory(int size, StringBuilder buf); No implementation Connecting the declaration with the implementation is implementation-dependent, but is often done using the DllImport attribute. Attributes are covered in detail in 24. For example, the following code uses an external method, GetCurrentDirectory, whose implementation is the Win32 system call for getting a string that contains the current directory. using System; using System.Text; using System.Runtime.InteropServices; namespace ExternalMethod { class MyClass { [DllImport("kernel32", SetLastError=true)] public static extern int GetCurrentDirectory(int a, StringBuilder b); } class Program { static void Main( ) { const int MaxDirLength = 250; StringBuilder sb = new StringBuilder(); sb.Length = MaxDirLength; MyClass.GetCurrentDirectory(MaxDirLength, sb); Console.WriteLine(sb); } } }

Azure Queue and Blob storage services are two basic forms of storage offered by the Azure framework. Another basic cloud storage offered by the Azure framework is table storage, which we covered in the last two chapters. In this chapter we are going to focus on Queue and Blob. Azure Queue messages can be listened for via event subscription. This feature makes Azure Queue a good candidate for building an event-driven distributed system. In this chapter I ll provide the basic know-how for using these two types of storage, a description of how to use both storage types to build an event-driven distributed system, and a tool for you to load a large stream to cloud Blob storage. The first exercise is about the basics of how to create and use the Azure Queue. The second exercise is an example of cloud Blob storage. In this exercise we will use Azure Queue as a trigger to create a blob record when the queue receives a message. The third exercise uses both Azure Queue and Blob storage services to build an event-driven distributed system. Before we see the exercises, however, let s see what Azure Queue and Blob Storage services are.

You need JDK 1.5+, an IDE such as Eclipse, a database (this book uses Apache Derby), and SQL Squirrel to provide a GUI to use the database. You can also use Maven to configure your project. Maven is a software project-management and comprehension tool. Based on the concept of a project object model

This code produces the following output:

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