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Azure Blob Container
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Figure 3-1. Cloud blob storage structure concepts The data object model of Azure Blob storage is shown in Figure 3-2. (This data map is generated using SQL Server Management Studio against the DevelopmentStorageDb on a local machine. The DevelopmentStorageDb database will be created the first time development storage is accessed and the local development storage is initialized by the Azure framework.) This database map actually reflects the concept diagram of Figure 3-1 and the relationship among the participants of all Blob storage tables. For example, a Blob container has an ID as its primary key, which is a foreign key of the Blob table. As I have mentioned, the local development environment and runtime environment fabric simulate the remote cloud environment. In the Azure cloud environment a physical table may have multiple instances running from distinct remote virtual machines.
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CHAPTER 3 WORKING WITH CLOUD QUEUE AND BLOB STORAGE
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Figure 3-2. Object models of blob storage
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Creating a Cloud Queue
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This exercise shows the basic steps to create a cloud queue, and how to put messages in and retrieve messages from queues. A queue can be created from either a worker role or a web role. In order to explore the collaboration mechanism between a web role and worker role in a cloud application, this exercise creates a queue from a worker role.
Note The code for this example is in the Exercise 3-1 bundle from the code download.
Add a Worker Role in the Cloud Service Solution
Add a worker role and associate that role to the service, as Figure 3-3 shows. The purpose of this approach is to demonstrate that the queue message can be manipulated from different processes. The responsibilities of this worker role are defined as: Retrieve account information from the configuration. Create a named queue storage container from cloud storage. Create a named queue within the queue storage.
CHAPTER 3 WORKING WITH CLOUD QUEUE AND BLOB STORAGE
These responsibilities will be implemented in one function and called by the start handler of the worker role when the service application starts from the Azure fabric.
Figure 3-3. Insert a worker role for queue initialization
Create a Queue Storage Container and Create a Named Queue from the Start Handler of the Worker Role
The data object model for Azure Queue storage is shown in Figure 3-4. The AcctQueueContainerMap table is used to map a queue name to the unique queue ID. This ID is used as a foreign key in the QueueContainer table and the Message table. These tables will be generated using the same approach we used in 1 to create the data entity C# classes; that is, we'll use Visual Studio to generate them.
Figure 3-4. The data object model of Azure Queue All queue names must be alphanumerical characters and are case-sensitive as well. Characters only in lowercase are accepted for a queue name. A QueueStorage instance needs to be instantiated before a named queue can be created. The constructor of QueueStorage accepts an account information object as a parameter. As is the case when
CHAPTER 3 WORKING WITH CLOUD QUEUE AND BLOB STORAGE
creating table storage, an account with a base-64 security key and storage end points is assigned at the time you register a storage type project on the Azure portal page. In the development environment the account information can either be hard-coded in the configuration file or entered programmatically. Listing 3-1 shows the configuration settings from the configuration file for queue storage. Listing 3-1. Account and HTTP Port End Point Configuration for Queue Storage in the Development Environment <appSettings> <add key = "AccountName" value="devstoreaccount1"/> <add key = "AccountSharedKey" value="<ACCOUNT_KEY>"/> <add key="QueueStorageEndpoint" value="http://127.0.0.1:10001" /> </appSettings>
Create the Queue Using Account Information from the Configuration File
Listing 3-2 is the implementation of the worker role project. The lines in bold show an example of how to create a named queue. Listing 3-2. Implementation of WorkerRole Shows How to Create Queue Using Configuration Files using using using using using using using using System; System.Threading; Microsoft.ServiceHosting.ServiceRuntime; Microsoft.Samples.ServiceHosting.StorageClient; System.IO; System.Configuration; System.Net; System.Xml;
namespace CloudTableStorageService_WorkerRole { public class WorkerRole : RoleEntryPoint { public const string XML_PAYLOAD_QUEUE_NAME = "createxmlmessagequeue"; public const string XML_CONTAINER_NAME = "xmlpayload"; private Stream CreateXmlStreamBlob(byte [] byteData) { return new MemoryStream(byteData); } public override void Start() { QueueStorage queueStorage = QueueStorage.Create(StorageAccountInfo .GetDefaultQueueStorageAccountFromConfiguration()); MessageQueue queue = queueStorage.GetQueue(XML_PAYLOAD_QUEUE_NAME);
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