protected override void Initialize(System.Web.Routing.RequestContext requestContext)
        {
            base.Initialize(requestContext);

            DataServiceContext context =
                new DataServiceContext(CloudStorageAccount.DevelopmentStorageAccount.TableEndpoint.AbsoluteUri,
                    CloudStorageAccount.DevelopmentStorageAccount.Credentials);

            CloudBlobClient blobClient = new CloudBlobClient(CloudStorageAccount.DevelopmentStorageAccount.BlobEndpoint.AbsoluteUri,
                CloudStorageAccount.DevelopmentStorageAccount.Credentials);

            Services = new ServiceFacade();

            Services.Accounts = new AccountService(Services, new AccountServiceImplementor(context));
            Services.Groups = new GroupService(Services, new GroupServiceImplementor(context));
            Services.Roles = new RoleService(Services, new RoleServiceImplementor(context));
            Services.Images = new ImageService(Services, new ImageServiceImplementor(context));
            Services.Blobs = new BlobService(Services, new BlobServiceImplementor(blobClient));

            if (User.Identity.IsAuthenticated)
                Account = Services.Accounts.Get(User.Identity.Name);
            else
                Account = null;

            if (null == Account)
                FormsAuthentication.SignOut();
            else
            {
                Account.LastActivityDate = DateTime.Now;
                Account.Save();
            }

            ViewData["Account"] = Account;
        }

 public AzureOperations(string connectionString)
 {
     CloudStorageAccount account = CloudStorageAccount.Parse(connectionString);
     client = account.CreateCloudBlobClient();
     var container = client.GetContainerReference("$root");
     container.CreateIfNotExist();
 }

 public AzureBlobClient(Uri endpoint, string accountName, string accountKey, int timeoutInMinutes = 30, int parallelOperationThreadCount = 1)
 {
     var credentials = new StorageCredentialsAccountAndKey(accountName, accountKey);
     blobClient = new CloudBlobClient(endpoint, credentials);
     blobClient.Timeout = new TimeSpan(0, timeoutInMinutes, 0);
     blobClient.ParallelOperationThreadCount = parallelOperationThreadCount;
 }

        public override bool OnStart()
        {
            // Set the maximum number of concurrent connections
            ServicePointManager.DefaultConnectionLimit = 12;
            #if DEBUG
            account = CloudStorageAccount.DevelopmentStorageAccount;
            #else
            account = new CloudStorageAccount(accountAndKey, true);
            #endif

            tableContext = new TableServiceContext(account.TableEndpoint.ToString(), account.Credentials);

            //client = new CloudQueueClient(account.BlobEndpoint.ToString(), account.Credentials);
            qclient = account.CreateCloudQueueClient();
            q = qclient.GetQueueReference("icd9mapplotrequests");
            rows = new List<ICD9MapPlotResultEntry>();
            bclient = account.CreateCloudBlobClient();
            container = bclient.GetContainerReference("results");
            container.CreateIfNotExist();
            client = account.CreateCloudTableClient();
            client.CreateTableIfNotExist("ICD9MapPlotResult");
            client.CreateTableIfNotExist("DoctorDetails");
            client.CreateTableIfNotExist("PatientDetails");
            // For information on handling configuration changes
            // see the MSDN topic at http://go.microsoft.com/fwlink/?LinkId=166357.

            return base.OnStart();
        }

 public static void MyClassInitialize(TestContext testContext)
 {
     CloudStorageAccount storageAccount = CloudStorageAccount.Parse(DevConnectionString);
     blobClient = storageAccount.CreateCloudBlobClient();
     container = blobClient.GetContainerReference(TestContainerName);
     container.CreateIfNotExist();
 }

 public LargeDataExample(String queueName)
 {
     CloudStorageAccount cloudStorageAccount = CloudStorageAccount.Parse(ConfigurationManager.AppSettings["DataConnectionString"]);
     CloudQueueClient cloudQueueClient = cloudStorageAccount.CreateCloudQueueClient();
     cloudQueue = cloudQueueClient.GetQueueReference(queueName);
     cloudBlobClient = cloudStorageAccount.CreateCloudBlobClient();
 }

        public override bool OnStart()
        {
            // Set the maximum number of concurrent connections
            ServicePointManager.DefaultConnectionLimit = 100;

            //Initialize Indexer
            storageAccount = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue("CrawlerStorage"));

            //Initialize URL Queue
            urlQueueClient = storageAccount.CreateCloudQueueClient();
            urlQueue = urlQueueClient.GetQueueReference("urlqueue");
            if (urlQueue.CreateIfNotExist())
            {
                //Add first URL to the queue
                CloudQueueMessage firstURL = new CloudQueueMessage(startURL);
                urlQueue.AddMessage(firstURL);
            }

            //Initialize Index Queue
            indexQueueClient = storageAccount.CreateCloudQueueClient();
            indexQueue = indexQueueClient.GetQueueReference("indexqueue");
            indexQueue.CreateIfNotExist();

            //Initialize Database Blob
            databaseClient = storageAccount.CreateCloudBlobClient();
            databaseContainer = databaseClient.GetContainerReference("wordfrequencies");
            databaseContainer.CreateIfNotExist();
            var permission = databaseContainer.GetPermissions();
            permission.PublicAccess = BlobContainerPublicAccessType.Container;
            databaseContainer.SetPermissions(permission);

            return base.OnStart();
        }

        public SharedAccessSignatureController(CloudStorageAccount storageAccount)
        {
            if (storageAccount == null)
                throw new ArgumentNullException("storageAccount", Constants.CloudStorageAccountNullArgumentErrorMessage);

            this.cloudBlobClient = storageAccount.CreateCloudBlobClient();
        }

        public AzureStorageProvider(CloudStorageAccount storageAccount)
        {
            cloudStorageAccount = storageAccount;

            // Create the blob client
            blobStorage = cloudStorageAccount.CreateCloudBlobClient();
        }

    // Constructor - pass in a storage connection string.
    public BlobHelper(string connectionString)
    {
        Account = CloudStorageAccount.Parse(connectionString);

            BlobClient = Account.CreateCloudBlobClient();
            BlobClient.RetryPolicy = RetryPolicies.Retry(4, TimeSpan.Zero);
    }

        private static string GetBlobPath(HttpRequest request)
        {
            string hostName = request.Url.DnsSafeHost;
            if (hostName == "localdev")
            {
                hostName = "www.protonit.net";
            }
            string containerName = hostName.Replace('.', '-');
            string currServingFolder = "";
            try
            {
                // "/2013-03-20_08-27-28";
                CloudBlobClient publicClient = new CloudBlobClient("http://caloom.blob.core.windows.net/");
                string currServingPath = containerName + "/" + RenderWebSupport.CurrentToServeFileName;
                var currBlob = publicClient.GetBlockBlobReference(currServingPath);
                string currServingData = currBlob.DownloadText();
                string[] currServeArr = currServingData.Split(':');
                string currActiveFolder = currServeArr[0];
                var currOwner = VirtualOwner.FigureOwner(currServeArr[1]);
                InformationContext.Current.Owner = currOwner;
                currServingFolder = "/" + currActiveFolder;
            }
            catch
            {

            }
            return containerName + currServingFolder + request.Path;
        }

        public BlobEntities()
        {
            if (storageInitialized)
            {
                return;
            }

            lock (gate)
            {
                if (storageInitialized)
                {
                    return;
                }
                    // read account configuration settings
                    var storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");

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

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

                storageInitialized = true;
            }
        }

        public Storage(CloudStorageAccount account)
        {
            this.account = account;

            fileStorage = account.CreateCloudBlobClient();

            /* Initialize file container */
            container = fileStorage.GetContainerReference(filesContainer);
            container.CreateIfNotExist();

            var permissions = container.GetPermissions();
            /* Full permissions. From MSDN, Container-level public access. Anonymous clients can
             * read blob content and metadata and container metadata, and can list the blobs within the container.
             *
             * Other alternatives are Blob (can read content but not metadata) and Off (no
             * anonymous access).
             */
            // permissions.PublicAccess = BlobContainerPublicAccessType.Container;
            permissions.PublicAccess = BlobContainerPublicAccessType.Off;

            permissions.SharedAccessPolicies.Remove("basic");
            permissions.SharedAccessPolicies.Add("basic", new SharedAccessPolicy()
            {
            });

            container.SetPermissions(permissions);

            /* Initialize table (for file metadata) */
            CloudTableClient.CreateTablesFromModel(
                typeof(FileDataContext),
                account.TableEndpoint.AbsoluteUri,
                account.Credentials);
        }

        public static Uri UploadFile(string storageName, string storageKey, string filePath)
        {
            var baseAddress = string.Format(CultureInfo.InvariantCulture, ConfigurationConstants.BlobEndpointTemplate, storageName);
            var credentials = new StorageCredentialsAccountAndKey(storageName, storageKey);
            var client = new CloudBlobClient(baseAddress, credentials);

            string containerName = "mydeployments";
            string blobName = string.Format(
                CultureInfo.InvariantCulture,
                "{0}_{1}",
                DateTime.UtcNow.ToString("yyyyMMdd_HHmmss", CultureInfo.InvariantCulture),
                Path.GetFileName(filePath));

            CloudBlobContainer container = client.GetContainerReference(containerName);
            container.CreateIfNotExist();
            CloudBlob blob = container.GetBlobReference(blobName);

            // blob.UploadFile(filePath);
            UploadBlobStream(blob, filePath);

            return new Uri(
                string.Format(
                    CultureInfo.InvariantCulture,
                    "{0}{1}{2}{3}",
                    client.BaseUri,
                    containerName,
                    client.DefaultDelimiter,
                    blobName));
        }

        public WorkerRoleLoader()
        {
            this.LastModified = DateTime.MinValue;

            this.storageAccount = CloudStorageAccount.FromConfigurationSetting(DataConfigurationKey);
            this.blobStorage = storageAccount.CreateCloudBlobClient();
        }

        //Allows other server code to use the InsertBlobUrl logic.
        //Maximum blob size is 32mb.
        internal static Task<string> InsertBlobUrlHelper(Guid ownerPartyId, Guid fileGuid)
        {
            return AsyncHelper.RunAsync(() =>
            {
                //Create service client for credentialed access to the Blob service.
                var blobClient = new CloudBlobClient(AzureServerHelpers.BlobStorageUrl,
                    new StorageCredentialsAccountAndKey(AzureServerHelpers.AccountName, AzureServerHelpers.AccountKey)) { Timeout = TimeSpan.FromMilliseconds(TimeoutMilliseconds) };

                //Get a reference to a container, which may or may not exist.
                var blobContainer = blobClient.GetContainerReference(AzureServerHelpers.BuildContainerUrl(ownerPartyId));
                //Create a new container, if it does not exist
                blobContainer.CreateIfNotExist(new BlobRequestOptions { Timeout = TimeSpan.FromMilliseconds(TimeoutMilliseconds) });

                //Setup cross domain policy so Silverlight can access the server
                CreateSilverlightPolicy(blobClient);

                //Get a reference to a blob, which may or may not exist.
                var blob = blobContainer.GetBlobReference(fileGuid.ToString());

                blob.UploadByteArray(new byte[] { });

                // Set the metadata into the blob
                blob.Metadata["Submitter"] = ownerPartyId.ToString();
                blob.SetMetadata();

                // Set the properties
                blob.Properties.ContentType = "application/octet-stream";
                blob.SetProperties();

                return blob.GetSharedAccessSignature(new SharedAccessPolicy { Permissions = SharedAccessPermissions.Write, SharedAccessExpiryTime = DateTime.UtcNow + new TimeSpan(0, 30, 0) });
            });
        }

        /// <summary>
        /// Get the signature hash embedded inside the Shared Access Signature.
        /// </summary>
        /// <param name="policy">The shared access policy to hash.</param>
        /// <param name="groupPolicyIdentifier">An optional identifier for the policy.</param>
        /// <param name="resourceName">The canonical resource string, unescaped.</param>
        /// <param name="client">The client whose credentials are to be used for signing.</param>
        /// <returns>The signed hash.</returns>
        internal static string GetSharedAccessSignatureHashImpl(
            SharedAccessPolicy policy,
            string groupPolicyIdentifier,
            string resourceName,
            CloudBlobClient client)
        {
            CommonUtils.AssertNotNull("policy", policy);
            CommonUtils.AssertNotNullOrEmpty("resourceName", resourceName);
            CommonUtils.AssertNotNull("client", client);

            ////StringToSign = signedpermissions + "\n"
            ////               signedstart + "\n"
            ////               signedexpiry + "\n"
            ////               canonicalizedresource + "\n"
            ////               signedidentifier
            ////HMAC-SHA256(URL.Decode(UTF8.Encode(StringToSign)))

            string stringToSign = string.Format(
                "{0}\n{1}\n{2}\n{3}\n{4}",
                SharedAccessPolicy.PermissionsToString(policy.Permissions),
                GetDateTimeOrEmpty(policy.SharedAccessStartTime),
                GetDateTimeOrEmpty(policy.SharedAccessExpiryTime),
                resourceName,
                groupPolicyIdentifier);

            string signature = client.Credentials.ComputeHmac(stringToSign);

            return signature;
        }

        internal static bool InitializeStorage()
        {
            try
            {
                // 仅为测试目的，如果我们不在计算仿真程序中运行该服务，我们始终使用 dev 存储.
                if (RoleEnvironment.IsAvailable)
                {
                    CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>
                    {
                        configSetter(RoleEnvironment.GetConfigurationSettingValue(configName));
                    });
                    StorageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
                }
                else
                {
                    StorageAccount = CloudStorageAccount.DevelopmentStorageAccount;
                }

                CloudBlobClient blobClient = new CloudBlobClient(StorageAccount.BlobEndpoint, StorageAccount.Credentials);
                CloudBlobContainer container = blobClient.GetContainerReference("videostories");
                container.CreateIfNotExist();
                CloudQueueClient queueClient = new CloudQueueClient(StorageAccount.QueueEndpoint, StorageAccount.Credentials);
                CloudQueue queue = queueClient.GetQueueReference("videostories");
                queue.CreateIfNotExist();
                CloudTableClient tableClient = new CloudTableClient(StorageAccount.TableEndpoint.AbsoluteUri, StorageAccount.Credentials);
                tableClient.CreateTableIfNotExist("Stories");
                return true;
            }
            catch (Exception ex)
            {
                Trace.Write("错误初始化存储: " + ex.Message, "Error");
                return false;
            }
        }

        private void OnInitialize()
        {
            var selfInstance        = InstanceEnumerator.GetSelf();

            cloudStorageAccount     = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue(ConfigurationSettingsKeys.StorageConnectionString));
            log.Info("Storage account selected: {0}",cloudStorageAccount.BlobEndpoint);
            
            cloudBlobClient         = cloudStorageAccount.CreateCloudBlobClient();
            log.Info("Storage client created");

            var containerName       = ConfigurationProvider.GetSetting(ConfigurationSettingsKeys.StorageContainerName,"ravendb");

            // In order to force a connection we just enumerate all available containers:
            var availableContainers = cloudBlobClient.ListContainers().ToArray();

            foreach (var container in availableContainers)
            {
                log.Info("Available container: {0}",container.Name);
            }

            if (!availableContainers.Any(c => c.Name.Equals(containerName)))
            {
                log.Info("Container {0} does not exist, creating",containerName);

                // Container does not exist:
                cloudBlobClient.GetContainerReference(containerName).Create();
            }

            cloudBlobContainer      = cloudBlobClient.GetContainerReference(containerName);
            log.Info("Container {0} selected",cloudBlobContainer.Name);

            localCache              = RoleEnvironment.GetLocalResource(ConfigurationSettingsKeys.StorageCacheResource);
            log.Info("Cache resource retrieved: {0}, path: {1}",localCache.Name,localCache.RootPath);
            CloudDrive.InitializeCache(localCache.RootPath, localCache.MaximumSizeInMegabytes);
            log.Info("Cache initialized: {0} mb",localCache.MaximumSizeInMegabytes);

            var driveName           = string.Format("{0}{1}.vhd", selfInstance.RoleName, selfInstance.RoleInstanceIndex).ToLowerInvariant();
            log.Info("Virtual drive name: {0}",driveName);
            
            var pageBlob            = cloudBlobContainer.GetPageBlobReference(driveName);
            log.Info("Virtual drive blob: {0}",pageBlob.Uri);

            cloudDrive              = cloudStorageAccount.CreateCloudDrive(pageBlob.Uri.ToString());
            log.Info("Virtual drive created: {0}",cloudDrive.Uri);

            var storageSize         = ConfigurationProvider.GetSetting(ConfigurationSettingsKeys.StorageSizeInMb, 50000);
            log.Info("Storage size: {0} mb",storageSize);

            cloudDrive.CreateIfNotExist(storageSize);
            log.Info("Virtual drive initialized: {0}",cloudDrive.Uri);

            var mountedDirectoryPath = cloudDrive.Mount(storageSize, DriveMountOptions.None);
            log.Info("Virtual drive mounted at: {0}",mountedDirectoryPath);

            mountedDirectory = new DirectoryInfo(mountedDirectoryPath);

            log.Info("Executing drive benchmark for: {0}",mountedDirectoryPath);
            ExecuteBenchmarks(mountedDirectory,storageSize);
            log.Info("Storage initialization succeeded");
        }

        /// <summary>
        /// Connect to an Azure subscription and upload a package to blob storage.
        /// </summary>
        protected override void AzureExecute()
        {
            string storageKey = this.StorageKeys.Get(this.ActivityContext).Primary;
            string storageName = this.StorageServiceName.Get(this.ActivityContext);
            string filePath = this.LocalPackagePath.Get(this.ActivityContext);

            var baseAddress = string.Format(CultureInfo.InvariantCulture, ConfigurationConstants.BlobEndpointTemplate, storageName);
            var credentials = new StorageCredentialsAccountAndKey(storageName, storageKey);
            var client = new CloudBlobClient(baseAddress, credentials);

            const string ContainerName = "mydeployments";
            string blobName = string.Format(
                CultureInfo.InvariantCulture,
                "{0}_{1}",
                DateTime.UtcNow.ToString("yyyyMMdd_HHmmss", CultureInfo.InvariantCulture),
                Path.GetFileName(filePath));

            CloudBlobContainer container = client.GetContainerReference(ContainerName);
            container.CreateIfNotExist();
            CloudBlob blob = container.GetBlobReference(blobName);

            UploadBlobStream(blob, filePath);

            this.PackageUrl.Set(this.ActivityContext, string.Format(CultureInfo.InvariantCulture, "{0}{1}{2}{3}", client.BaseUri, ContainerName, client.DefaultDelimiter, blobName));
        }