Windows Azure Sample

void Application_Start(object sender, EventArgs e)
        {
            // Code that runs on application startup
            Microsoft.WindowsAzure.CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>
            {
                configSetter(RoleEnvironment.GetConfigurationSettingValue(configName));
            });
        }

// ----------------------------------------------------------------------------------
// Microsoft Developer & Platform Evangelism
// 
// Copyright (c) Microsoft Corporation. All rights reserved.
// 
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, 
// EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES 
// OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
// ----------------------------------------------------------------------------------
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious.  No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
// ----------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.IO;
using System.Net;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.ServiceRuntime;
using Microsoft.WindowsAzure.StorageClient;
using GuestBook_Data;

namespace GuestBook_WebRole
{
    public partial class _Default : System.Web.UI.Page
    {
        private static bool storageInitialized = false;
        private static object gate = new Object();
        private static CloudBlobClient blobStorage;
        private static CloudQueueClient queueStorage;

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                Timer1.Enabled = true;
            }
        }

        protected void SignButton_Click(object sender, EventArgs e)
        {
            if (FileUpload1.HasFile)
            {
                InitializeStorage();

                // upload the image to blob storage
                string uniqueBlobName = string.Format("guestbookpics/image_{0}{1}", Guid.NewGuid().ToString(), Path.GetExtension(FileUpload1.FileName));
                CloudBlockBlob blob = blobStorage.GetBlockBlobReference(uniqueBlobName);
                blob.Properties.ContentType = FileUpload1.PostedFile.ContentType;
                blob.UploadFromStream(FileUpload1.FileContent);
                System.Diagnostics.Trace.TraceInformation("Uploaded image '{0}' to blob storage as '{1}'", FileUpload1.FileName, uniqueBlobName);

                // create a new entry in table storage
                GuestBookEntry entry = new GuestBookEntry() { GuestName = NameTextBox.Text, Message = MessageTextBox.Text, PhotoUrl = blob.Uri.ToString(), ThumbnailUrl = blob.Uri.ToString() };
                GuestBookDataSource ds = new GuestBookDataSource();
                ds.AddGuestBookEntry(entry);
                System.Diagnostics.Trace.TraceInformation("Added entry {0}-{1} in table storage for guest '{2}'", entry.PartitionKey, entry.RowKey, entry.GuestName);

                // queue a message to process the image
                var queue = queueStorage.GetQueueReference("guestthumbs");
                var message = new CloudQueueMessage(String.Format("{0},{1},{2}", blob.Uri.ToString(), entry.PartitionKey, entry.RowKey));
                queue.AddMessage(message);
                System.Diagnostics.Trace.TraceInformation("Queued message to process blob '{0}'", uniqueBlobName);
            }

            NameTextBox.Text = "";
            MessageTextBox.Text = "";

            DataList1.DataBind();
        }

        protected void Timer1_Tick(object sender, EventArgs e)
        {
            DataList1.DataBind();
        }

        private void InitializeStorage()
        {
            if (storageInitialized)
            {
                return;
            }

            lock (gate)
            {
                if (storageInitialized)
                {
                    return;
                }

                try
                {
                    // read account configuration settings
                    var storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");

                    // create blob container for images
                    blobStorage = storageAccount.CreateCloudBlobClient();
                    CloudBlobContainer container = blobStorage.GetContainerReference("guestbookpics");
                    container.CreateIfNotExist();

                    // configure container for public access
                    var permissions = container.GetPermissions();
                    permissions.PublicAccess = BlobContainerPublicAccessType.Container;
                    container.SetPermissions(permissions);

                    // create queue to communicate with worker role
                    queueStorage = storageAccount.CreateCloudQueueClient();
                    CloudQueue queue = queueStorage.GetQueueReference("guestthumbs");
                    queue.CreateIfNotExist();
                }
                catch (WebException)
                {
                    throw new WebException("Storage services initialization failure. "
                        + "Check your storage account configuration settings. If running locally, "
                        + "ensure that the Development Storage service is running.");
                }

                storageInitialized = true;
            }
        }
    }
}


using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Threading;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.Diagnostics;
using Microsoft.WindowsAzure.ServiceRuntime;
using Microsoft.WindowsAzure.StorageClient;

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using GuestBook_Data;

namespace GuestBook_WorkerRole
{
    public class WorkerRole : RoleEntryPoint
    {
        private CloudQueue queue;
        private CloudBlobContainer container;

        public void ProcessImage(Stream input, Stream output)
        {
            int width;
            int height;
            var originalImage = new Bitmap(input);

            if (originalImage.Width > originalImage.Height)
            {
                width = 128;
                height = 128 * originalImage.Height / originalImage.Width;
            }
            else
            {
                height = 128;
                width = 128 * originalImage.Width / originalImage.Height;
            }

            var thumbnailImage = new Bitmap(width, height);

            using (Graphics graphics = Graphics.FromImage(thumbnailImage))
            {
                graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                graphics.SmoothingMode = SmoothingMode.AntiAlias;
                graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
                graphics.DrawImage(originalImage, 0, 0, width, height);
            }

            thumbnailImage.Save(output, ImageFormat.Jpeg);
        }

        public override void Run()
        {
            Trace.TraceInformation("Listening for queue messages...");

            while (true)
            {
                try
                {
                    // retrieve a new message from the queue
                    CloudQueueMessage msg = queue.GetMessage();
                    if (msg != null)
                    {
                        // parse message retrieved from queue
                        var messageParts = msg.AsString.Split(new char[] { ',' });
                        var imageBlobUri = messageParts[0];
                        var partitionKey = messageParts[1];
                        var rowkey = messageParts[2];
                        Trace.TraceInformation("Processing image in blob '{0}'.", imageBlobUri);

                        string thumbnailBlobUri = System.Text.RegularExpressions.Regex.Replace(imageBlobUri, "([^\\.]+)(\\.[^\\.]+)?$", "$1-thumb$2");

                        CloudBlob inputBlob = container.GetBlobReference(imageBlobUri);
                        CloudBlob outputBlob = container.GetBlobReference(thumbnailBlobUri);

                        using (BlobStream input = inputBlob.OpenRead())
                        using (BlobStream output = outputBlob.OpenWrite())
                        {
                            ProcessImage(input, output);

                            // commit the blob and set its properties
                            output.Commit();
                            outputBlob.Properties.ContentType = "image/jpeg";
                            outputBlob.SetProperties();

                            // update the entry in table storage to point to the thumbnail
                            GuestBookDataSource ds = new GuestBookDataSource();
                            ds.UpdateImageThumbnail(partitionKey, rowkey, thumbnailBlobUri);

                            // remove message from queue
                            queue.DeleteMessage(msg);

                            Trace.TraceInformation("Generated thumbnail in blob '{0}'.", thumbnailBlobUri);
                        }
                    }
                    else
                    {
                        System.Threading.Thread.Sleep(1000);
                    }
                }
                catch (StorageClientException e)
                {
                    Trace.TraceError("Exception when processing queue item. Message: '{0}'", e.Message);
                    System.Threading.Thread.Sleep(5000);
                }
            }
        }

        public override bool OnStart()
        {
            // Set the maximum number of concurrent connections 
            ServicePointManager.DefaultConnectionLimit = 12;

            // For information on handling configuration changes
            // see the MSDN topic at http://go.microsoft.com/fwlink/?LinkId=166357.

            // read storage account configuration settings
            CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>
            {
                configSetter(RoleEnvironment.GetConfigurationSettingValue(configName));
            });
            var storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");

            // initialize blob storage
            CloudBlobClient blobStorage = storageAccount.CreateCloudBlobClient();
            container = blobStorage.GetContainerReference("guestbookpics");

            // initialize queue storage 
            CloudQueueClient queueStorage = storageAccount.CreateCloudQueueClient();
            queue = queueStorage.GetQueueReference("guestthumbs");

            Trace.TraceInformation("Creating container and queue...");

            bool storageInitialized = false;
            while (!storageInitialized)
            {
                try
                {
                    // create the blob container and allow public access
                    container.CreateIfNotExist();
                    var permissions = container.GetPermissions();
                    permissions.PublicAccess = BlobContainerPublicAccessType.Container;
                    container.SetPermissions(permissions);

                    // create the message queue(s)
                    queue.CreateIfNotExist();

                    storageInitialized = true;
                }
                catch (StorageClientException e)
                {
                    if (e.ErrorCode == StorageErrorCode.TransportError)
                    {
                        Trace.TraceError("Storage services initialization failure. "
                          + "Check your storage account configuration settings. If running locally, "
                          + "ensure that the Development Storage service is running. Message: '{0}'", e.Message);
                        System.Threading.Thread.Sleep(5000);
                    }
                    else
                    {
                        throw;
                    }
                }
            }

            return base.OnStart();
        }
    }
}



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.StorageClient;

namespace GuestBook_Data
{
    public class GuestBookDataSource
    {
        private static CloudStorageAccount storageAccount;
        private GuestBookDataContext context;

        static GuestBookDataSource()
        {
            storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");

            CloudTableClient.CreateTablesFromModel(
                typeof(GuestBookDataContext),
                storageAccount.TableEndpoint.AbsoluteUri,
                storageAccount.Credentials);
        }

        public GuestBookDataSource()
        {
            this.context = new GuestBookDataContext(storageAccount.TableEndpoint.AbsoluteUri, storageAccount.Credentials);
            this.context.RetryPolicy = RetryPolicies.Retry(3, TimeSpan.FromSeconds(1));
        }

        public IEnumerable<GuestBookEntry> GetGuestBookEntries()
        {
            var results = from g in this.context.GuestBookEntry
                          where g.PartitionKey == DateTime.UtcNow.ToString("MMddyyyy")
                          select g;
            return results;
        }

        public void AddGuestBookEntry(GuestBookEntry newItem)
        {
            this.context.AddObject("GuestBookEntry", newItem);
            this.context.SaveChanges();
        }

        public void UpdateImageThumbnail(string partitionKey, string rowKey, string thumbUrl)
        {
            var results = from g in this.context.GuestBookEntry
                          where g.PartitionKey == partitionKey && g.RowKey == rowKey
                          select g;

            var entry = results.FirstOrDefault<GuestBookEntry>();
            entry.ThumbnailUrl = thumbUrl;
            this.context.UpdateObject(entry);
            this.context.SaveChanges();
        }
    }
}



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace GuestBook_Data
{
    public class GuestBookDataContext
        : Microsoft.WindowsAzure.StorageClient.TableServiceContext
    {
        public GuestBookDataContext(string baseAddress, Microsoft.WindowsAzure.StorageCredentials credentials)
            : base(baseAddress, credentials)
        { }

        public IQueryable<GuestBookEntry> GuestBookEntry
        {
            get
            {
                return this.CreateQuery<GuestBookEntry>("GuestBookEntry");
            }
        }
    }
}



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.WindowsAzure.StorageClient;

namespace GuestBook_Data
{
    public class GuestBookEntry
        : Microsoft.WindowsAzure.StorageClient.TableServiceEntity
    {
        public GuestBookEntry()
        {
            PartitionKey = DateTime.UtcNow.ToString("MMddyyyy");

            // Row key allows sorting, so we make sure the rows come back in time order.
            RowKey = string.Format("{0:10}_{1}", DateTime.MaxValue.Ticks - DateTime.Now.Ticks, Guid.NewGuid());
        }

        public string Message { get; set; }
        public string GuestName { get; set; }
        public string PhotoUrl { get; set; }
        public string ThumbnailUrl { get; set; }
    }
}

 <?xml version="1.0" encoding="utf-8"?>

<ServiceConfiguration serviceName="GuestBook" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration" osFamily="1" osVersion="*">
  <Role name="GuestBook_WebRole">
    <Instances count="1" />
    <ConfigurationSettings>
      <Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString" value="UseDevelopmentStorage=true" />
      <Setting name="DataConnectionString" value="UseDevelopmentStorage=true" />
    </ConfigurationSettings>
  </Role>
  <Role name="GuestBook_WorkerRole">
    <Instances count="1" />
    <ConfigurationSettings>
      <Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString" value="UseDevelopmentStorage=true" />
      <Setting name="DataConnectionString" value="UseDevelopmentStorage=true" />
    </ConfigurationSettings>
  </Role>
</ServiceConfiguration>


<?xml version="1.0" encoding="utf-8"?>
<ServiceDefinition name="GuestBook" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition">
  <WebRole name="GuestBook_WebRole">
    <Sites>
      <Site name="Web">
        <Bindings>
          <Binding name="Endpoint1" endpointName="Endpoint1" />
        </Bindings>
      </Site>
    </Sites>
    <Endpoints>
      <InputEndpoint name="Endpoint1" protocol="http" port="80" />
    </Endpoints>
    <Imports>
      <Import moduleName="Diagnostics" />
    </Imports>
    <ConfigurationSettings>
      <Setting name="DataConnectionString" />
    </ConfigurationSettings>
  </WebRole>
  <WorkerRole name="GuestBook_WorkerRole">
    <Imports>
      <Import moduleName="Diagnostics" />
    </Imports>
    <ConfigurationSettings>
      <Setting name="DataConnectionString" />
    </ConfigurationSettings>
  </WorkerRole>
</ServiceDefinition>