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Windows Azure

Microsoft Azure : Designing our Sample Application

6/9/2011 5:15:48 PM
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Like any project in real life, we start with the business requirements. At Jupiter Motors, we build custom recreational vehicles (RVs). We've recently opened a new state-of-the-art assembly plant, and implemented a new Enterprise Resource Planning (ERP) solution. Jupiter Motors now wants to build a customer portal to improve our relationship with our customers, and our team is tasked with building this portal.

Project design

All RV sales are handled by independent dealers, who work with our customers and place the customers' orders directly into our ERP system using remote terminals. All orders are reviewed by a production manager, and are approved for production or sent back to the dealer for revision. Once an order has been approved, it should become visible on the portal to the customer.

Assembly begins, and as the process may take several weeks, we want to upload photos of the RV while it's being assembled so that impatient customers can watch the progress. Assembly teams at each stage of the process are responsible for uploading photos as they finish their work.

When the assembly is complete, a driver will deliver the RV to the customer. The customer inspects the RV, and accepts the delivery by signing a tablet PC carried by the driver.

After looking at this summary, we know our customer portal will need the following components:

  • A mechanism to transfer data from our ERP system to the portal.

  • A database on the portal to hold the transferred data.

  • A way to upload and store photographs of the RV.

  • User interface for the customers to view their RV.

  • Ability to print copies of their order.

  • Some way to make sure only customers can log in to the portal.

  • A way to make sure the customers can see only their vehicle and order details.

  • Serve as an intermediary between customer acceptances and the ERP system. Delivery drivers will update the order in our portal when a customer accepts delivery, and a process in the ERP system will retrieve acceptances and update the ERP system.

  • A debug mode, where we can trace events in case there are issues.

An overview of the information flow is shown in the next diagram:

Why are we choosing Azure for our portal? Presumably, we want to use Azure for reasons other than it being the "shiny new thing". Some of the reasons we've decided to use Azure are:

  • We're already familiar with Visual Studio, SQL Server, and .NET, so Azure will be familiar to us. Even if we were Java or PHP developers, the Eclipse toolkits and SDKs mean that our skills would still transfer to Azure.

  • In this project, storage and retrieval of photos are a principal component. When compared to storing photos in a SQL Server database or on a file system, Blob hosting is easy to use and cost effective.

  • Photos require a great deal of bandwidth, and Azure has a content delivery network (CDN) we could utilize if necessary.

  • Other companies (for example, Outback a case study can be found at http://www.microsoft.com/caseStudies/Case_Study_Detail.aspx?casestudyid=4000005861) have had great success with Azure social sites. They were able to scale their sites as traffic increased, and could quickly scale to handle traffic spikes.

  • There is talk of adding videos, message boards, and other social features to the site, and the Azure platform helps us add these features in short it helps us plan the future!

  • Azure is a pay-as-you-go platform. Having just invested a great deal into an ERP implementation, management is reluctant to invest in additional hardware and software licenses at this time. The monthly fees fit our revenue structure better.


Integrating application with cloud features

Now it's time to pull this all together, matching our application requirements to the different features of Microsoft Azure. Not every feature of Azure will be used in this project, but as we gain familiarity with Azure, we'll discuss the major features so that we can be prepared for future projects.

Requirement Azure feature Summary
Development environment Development Fabric The Azure SDK includes the Development Fabric, which we will use to develop our application.
Portal data storage SQL Azure An almost feature complete version of SQL Server 2008, SQL Azure will be familiar to us.
Data transfer SSIS SQL Server 2008 R2 supports connections to SQL Azure.
Photo upload Blob storage, Client Library We'll develop a simple Windows Forms Application to upload photos into blobs using a client library, rather than the REST API.
Customer portal UI Web role Our portal will be a custom-built ASP.NET application.
Limiting access to users Access Control One of AppFabric's two components is a claims-based identity service known as Access Control.
Copies of orders SSRS The full SSRS server is not yet supported, but we can use a local report and the ReportViewerControl.
Delivery acceptance Web role/WCF, Queue, REST API We'll develop a simple Windows Forms application that creates a message in the queue via the REST API when a customer accepts delivery of their RV.
Processing delivery acceptance Worker role A worker role process will read acceptances from the queue and update the database accordingly.
Debug mode Diagnostics Using a value in a configuration file, the portal can be placed in a debug mode, where we can trace events. We'll retrieve logged events from Table Storage.

To sum it all up, our application will look like the following diagram:

As we work through our sample application, it's important to note that this is all sample code. As with all sample applications, there are a lot of shortcuts in the code that will be taken throughout the book from this point forward. Much of the code will be used as example only, with no error handling and very little security measures. With that said, this code should not be used in any production environment unless security and error handling are added. Any code herein should also be modified to comply with coding standards, as applicable.

Creating an Azure account

A Windows Live ID (WLID) is necessary for creating an Azure account. Any e-mail address can be used to create a WLID so that we're free to use our corporate e-mail addresses. The account should be chosen with care, as only one ID can be used as the Account Administrator. The Account Administrator is responsible for the billing account and adding services. The login credentials will need to be shared if there are to be multiple people responsible for overall management of the Azure account, or at least being a backup administrator. Different WLIDs can be designated as Service Administrators. Service Administrators are responsible for the management of the services they've been assigned to. These tasks can include scaling the instances of our web role or adding additional table or queue storage.

Limiting the administration task to a single user isn't out of the ordinary. Usually the ultimate responsibility for production deployment should rest with one person such as the build master or equivalent role; however, for disaster planning, there should always be a capable backup in place. A management API exists and its likely management tools will be developed as time goes on. Also, MSDN Premium and higher subscriptions include Azure benefits. This is a great way to do some prototyping and testing, but the login is bound to the same one used for the MSDN account. However, this means that a new account, bound to a different e-mail address, needs to be created for the production account.

The first step in creating an Azure account is to visit http://www.microsoft.com/windowsazure/ and choose our pricing plan. (At the time of writing, one had to click the Sign up now button to work on pricing plan.) These plans are likely to change over time, but they come in essentially two versions pay-as-you-go where we are billed monthly for the services we use, and pre-paid style where we pay up front for the services we expect to use. The services in the pre-paid plans are discounted from the pay-as-you-go plan, but require a large up-front payment. If we use less than the resources we estimated, this indicates we have overpaid, but if we use more than we estimated, we need to pay for the additional services. Because estimating usage is difficult until we've been online for a while, the pay-as-you-go plan is a little easier to get started on. Once the site is up and running, we can analyze our usage and change the billing plan if necessary.

Once we've found the plan that fits our needs, we click the Buy button, and we're taken to the Microsoft Online Services Customer Portal (MOCP). If we aren't signed in to our WLID, we're prompted to do so. The MOCP is the portal where we'll review our Azure billing, but this is not the portal where we actually manage Azure. Microsoft's other services, such as Hosted Exchange and Live Meeting, are also billed through the MOCP.

In the MOCP, we progress through a shopping cart where we supply our billing information and accept Microsoft's terms and conditions. Once we've completed our purchase, our Azure account will be provisioned and a welcome e-mail will be sent to the account's e-mail address. Now we can log in to the Windows Azure Platform Portal at http://windows.azure.com/, and set up the services we need. Setting up the services is a bridge we'll cross when we get there. In the meantime, we have plenty to do to get this project started.

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