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24.08.2015
Azure Websites is a fully managed Platform-as-a-Service (PaaS) that enables you to build, deploy and scale enterprise-grade web Apps in seconds. I'll right-click the Web Application Project node in Solution Explorer, expand the Add context menu, and select the New Azure WebJob Project context menu item from the fly-out.
When I select the New Azure WebJob Project context menu item, the Add Azure WebJob dialog opens. With Visual Studio Update 4 or the Azure SDK 2.5, I'll have two project templates to choose from based on the run mode of my WebJob. Included along with the Program.cs file that launches my WebJob is a second file containing boilerplate code that uses the WebJobs SDK to watch an Azure Storage Queue.
The code for scheduled and on-demand WebJobs is slightly different from the code dropped in for continuous WebJobs.
The code below, from the on-demand WebJob project, simply has a method in it named ManualTrigger that drops a message into an Azure Storage Queue using the Queue attribute decorating the final method parameter. The idea is simple - the first WebJob is running continuously, watching an Azure Storage Queue for incoming messages, whereas the second WebJob will be executed manually to drop messages into the Azure Storage Queue being watched. Now that the site is ready and armed with both on-demand and continuous WebJobs for background processing, the site and the WebJobs can easily be published with one context-menu click. Since I'll be publishing my Web Application with WebJobs, I'll need to select Microsoft Azure Websites when asked what my publishing target will be.


Since I don't yet have a destination Website running in Azure to which my Web Application Project can be deployed, I'll click the New button in the Select Existing Website dialog. To enable remote debugging of my Website and Azure WebJobs, I'll select Debug from the Configuration drop-down menu. During the publish preview, take note that the WebJobs are going to be published along with the Website contents. Azure WebJobs make use of Azure Storage for passing messages through queues and for storing or retrieving files from Azure Blob containers. Luckily, the Azure SDK for Visual Studio gives me easy accessibility to my Azure Storage accounts within the Visual Studio Server Explorer. Since I've selected Continuous for this first WebJob, the code dropped into the project will be specific to a continuous scenario.
The Program.cs code for an on-demand job, shown below, doesn't block the WebJob's EXE from exiting. When the value of this out parameter is set in the second line of the method, a new Azure Storage Queue message is dropped into the queue so that it can be processed by the first WebJob, which is running continuously and watching the queue for incoming messages. The WebJobs tooling knows, at this point, that the two WebJob projects should be published along with the Web Application Project's content files. In addition, the WebJobs Dashboard makes use of Azure Storage to store up statistics about how and when the WebJobs are executed.


By right-clicking on the Storage node of the Server Explorer, I can easily create a new Azure Storage Account using the context menu. I'll also select the same region that will house my Azure Website, placing both the Website and the Storage Account into the same geographical region.
This blog post will introduce you to some of the new features for developers who want to create, deploy, and debug Azure WebJobs.
If I'd had an existing Console Application or WebJobs project sitting on disk, I could have selected the Existing Project as Azure WebJob context menu instead, which would allow me to browse my local computer to find an existing project.
This will allow the continuous WebJob to remain in memory so that it can monitor an Azure Storage Queue for incoming messages. This WebJob will be one that doesn't run continuously or watch Azure Storage Queues, but rather, will run only when a user elects to run the WebJob from within Visual Studio or from the Azure Management Portal.
To reap these benefits, I'll need to configure the host Azure Website with the Storage Account connection string for my WebJobs storage and dashboard.



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