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If you are working with Visual Studio 2008, you will need to download and install the Azure SDK and Tools. At the time of writing, when you create a new Cloud Service project in VS2010 for the first time, it will download the latest version of the Azure tools.
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The first type of application we will create is called a web role. In Windows Azure the term web role refers to an application that is accessible over HTTP (which in our example is an ASP.NET application) although it is also possible to create other types such as ASP.NET MVC, Delphi, PHP, Ruby, or even a C++ application (through a CGI web role). It s also probably worth mentioning that Azure applications operate in full trust.
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We will now create and deploy a very simple application that reads a value from a configuration file and prints it to the screen with the current time and date. 1. 2. 3. Load up Visual Studio. Create a new Windows Azure Cloud Service project called 16.HelloAzure. Visual Studio will now ask you what roles you want to create within your project (Figure 16-2).
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Figure 16-2. Adding a web role to project 4. 5. 6. Select ASP.NET Web Role and click the > button to add it into your solution. Right-click on the role in the right-hand pane, select Rename on the context menu, and call it 16.WebRole. Click OK.
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Visual Studio will now create two projects within the solution (Figure 16-3): 16.HelloAzure 16.WebRole
Figure 16-3. Azure project layout
16.WebRole
This is a standard ASP.NET project that references some Azure-specific functionality.
16.HelloAzure
The 16.HelloAzure project describes our application to Windows Azure and allows us to configure it for the Azure platform. We will use the output from this project when we deploy our application. 16.HelloAzure contains two (annoyingly similarly named) configuration files you will not have come across before: ServiceDefinition.csdef ServiceConfiguration.cscfg
WINDOWS AZURE
ServiceDefinition.csdef
ServiceDefinition.csdef is responsible for Describing your application's requirements Defining configurable settings that your application will use (the actual values are defined in ServiceConfiguration.cscfg) Configuration settings applicable to all instances of your application
ServiceConfiguration.cscfg
ServiceConfiguration.cscfg is responsible fors responsible for Defining the values of your configuration settings for each role Determining the number of instances of your application to create
Azure and Configuration Settings
Most applications have some element of configuration. In our example application, we will define a configurable value that we will be read in the Page_Load event with the RoleManager.getConfigurationSetting() method. 1. Select the 16.HelloAzure project and open ServiceDefinition.csdef. The contents should look something like this: < xml version="1.0" encoding="utf-8" > <ServiceDefinition name="16.HelloAzure" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition"> <WebRole name="16.WebRole"> <InputEndpoints> <InputEndpoint name="HttpIn" protocol="http" port="80" /> </InputEndpoints> <ConfigurationSettings> <Setting name="DiagnosticsConnectionString" /> </ConfigurationSettings> </WebRole> </ServiceDefinition> 2. Add the following inside the ConfigurationSettings element to tell Azure that we will be creating a setting called Message: <Setting name="Message"/> 3. Your ServiceDefinition.csdef file should now look like the following: < xml version="1.0" encoding="utf-8" > <ServiceDefinition name="16.HelloAzure" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition"> <WebRole name="16.WebRole"> <InputEndpoints> <InputEndpoint name="HttpIn" protocol="http" port="80" /> </InputEndpoints>
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<ConfigurationSettings> <Setting name="DiagnosticsConnectionString" /> <Setting name="Message"/> </ConfigurationSettings> </WebRole> </ServiceDefinition> 4. We will now define the actual value of this setting, so open ServiceDefinition.cscfg and add a new setting inside the ConfigurationSettings element: <Setting name="Message" value="Hello Azure"/> 5. While we are working with ServiceDefinition.cscfg, find the element that reads <Instances count="1"/> and change it to <Instances count="5"/> 6. Changing the instances count tells Azure to create five instances of our application and simulates scaling our application to use five Azure nodes (you will need to set this back before deployment depending on your pricing structure). This setting can be easily amended online; note how easy it is to quickly scale up your application depending on demand. Microsoft recently announced Azure supports an API that allows you to do this programmatically. Your ServiceDefinition.cscfg should now look like < xml version="1.0" > <ServiceConfiguration serviceName="16.HelloAzure" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration"> <Role name="16.WebRole"> <Instances count="5" /> <ConfigurationSettings> <Setting name="DiagnosticsConnectionString" value="UseDevelopmentStorage=true" /> <Setting name="Message" value="Hello Azure"/> </ConfigurationSettings> </Role> </ServiceConfiguration> Open Default.aspx.cs and enter the following code: using Microsoft.WindowsAzure.ServiceRuntime; protected void Page_Load(object sender, EventArgs e) { string GreetingString = "" + RoleEnvironment.GetConfigurationSettingValue("message"); Response.Write(GreetingString + " at " + DateTime.Now.ToString()); } 7. Press F5 to run the application and you should see the greeting value we defined output to the screen with the current time and date.
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