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Listing 16.2 A sample REST request header
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POST /queue21b3c6dfe8626450880b9e16c70e2425e/messages timeout=30 HTTP/1.1 x-ms-date: Fri, 07 Aug 2009 01:26:38 GMT Authorization: SharedKey hsslog:Iow8eYFGeodLGqXrgbEcwDuA+aNOR0emEC9uy3Vnggg= Host: hsslog.queue.core.windows.net Content-Length: 80 Expect: 100-continue
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The service version header is useful for preventing an update to the queue service from disrupting your system. You can force your requests to be processed by a specific version of the storage service, allowing you to control when you support and leverage new features in a newer version of the service. If you omit the version header, your request will be routed to the default version of the service. A queue can t be made public or anonymous. Every operation against a queue must be authenticated with the shared key method. Constructing the authorization header for queue requests is the same as for BLOBs and tables. Now that you know how to forge the header, or the envelope, for a message, let s look at how to send commands to the queue.
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16.2 Working with basic queue operations
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To show you how to use the basic queue API operations, we re going to build a queue browser. This little tool (shown in figure 16.4) will help you debug any system you re
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Figure 16.4 A screenshot of the simple queue browser we ll build in this chapter. It s important to note that your authors, while charming, aren t graphic designers or UX specialists. This tool will act as a vehicle for understanding the basics of working with queues.
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Messaging with the queue
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building, by letting you look at the queues that are being used and see how they re working. We ll be focusing on creating methods that perform each of the following operations of the browser:
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ListQueues() Lists the queues that exist in your storage account Create() or CreateIfNotExist() Creates queues in your account SetMetadata() Writes metadata Clear() Clears a queue of all of its pending messages Delete() Deletes a queue or a message from the system
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We aren t going to focus on how WPF works, or the best application architecture for this little application. This is meant to be me-ware something that works for you and doesn t have to work for anyone else. You should use it as a harness to play with the different APIs and learn how they work.
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16.2.1 Get a list of queues
There are several basic queue operations that you ll need to be able to work with. The first one we re going to look at is a method that will tell you what queues exist in your account. You may not always need this. Usually, you ll know what the queue for your application is and provision it for yourself. To get a list of the available queues, you need to first connect to the queue service and then call the method. You can see how in the following listing.
Listing 16.3 Connecting to the queue service and getting a list of queues
private CloudQueueClient Qsvc; private IEnumerable<CloudQueue> qList; CloudStorageAccount storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString"); Qsvc = storageAccount.CreateCloudQueueClient(); qList = Qsvc.ListQueues();
Creates queue client to interact with queue
You ll use something like line q quite often. This creates a connection to the service, similar to how you create a connection object to a database. You ll want to create this once for a block of code and hold it in memory so that you aren t always reconnecting to the service. In this little application, we create this object in the constructor for the window itself and store it in a variable at the form level. This makes it available to every method in the form and saves you the trouble of having to continuously recreate the object. The CloudStorageAccount serves as a factory that creates service objects that represent the Azure Queue storage service, called the CloudQueueClient. There are several ways to create the CloudQueueClient. The most common approach is to create it as in listing 16.3, by using the FromConfigurationSetting method. This looks into
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