} // End of the TestToDownloadImage method
/// <summary>
/// Create or wait for a lock
/// </summary>
private async Task CreateOrWaitForLock(Int32 threadId)
{
// Add options
BlobLockOptions options = new BlobLockOptions();
options.connection_string = this.configuration.GetSection("AppSettings")["AzureStorageAccount"];
options.container_name = "test-locks";
options.blob_name = "test.lck";
// Use a blob lock, the lock is disposed by the using block
using (BlobLock blobLock = new BlobLock(options))
{
// Do work inside a blob lock
if (await blobLock.CreateOrWait() == true)
{
Logger.LogMessage("Thread " + threadId.ToString() + ": Has lock for 2 seconds. Date: " + DateTime.UtcNow.ToString("s"));
// Read from the blob
Logger.LogMessage("Text: " + await blobLock.ReadFrom());
// Sleep for 3 seconds
await Task.Delay(TimeSpan.FromSeconds(2));
}
}
} // End of the CreateOrWaitForLock method
} // End of the UploadImage method
/// <summary>
/// Download an image from the blob
/// </summary>
private async Task DownloadImage(Int32 threadId)
{
// Add options
BlobLockOptions options = new BlobLockOptions()
{
connection_string = this.configuration.GetSection("AppSettings")["AzureStorageAccount"],
container_name = "test-locks",
blob_name = "image.jpg"
};
// Use a blob lock, the lock is disposed by the using block
using (BlobLock blobLock = new BlobLock(options))
{
// Do work inside a blob lock
if (await blobLock.CreateOrSkip() == true)
{
Logger.LogMessage("Thread " + threadId.ToString() + ": Has lock during download.");
// Download an image to a file
using (FileStream fileStream = File.OpenWrite("D:\\Bilder\\Azure-blob-image.jpg"))
{
await blobLock.ReadFrom(fileStream);
}
Logger.LogMessage("Thread " + threadId.ToString() + ": Image has been downloaded.");
}
else
{
Logger.LogMessage("Thread " + threadId.ToString() + ": Does not wait for the lock to be released.");
}
}
} // End of the DownloadImage method
public static Int32 DATABASE_VERSION = 13; // The version number is +1 compared to the file version number
#endregion
#region Upgrade methods
/// <summary>
/// Upgrade the database
/// </summary>
public static void UpgradeDatabase()
{
// Variables
string azureStorageAccount = Tools.GetAzureStorageAccount();
Int32 currentDatabaseVersion = 0;
// Check if a storage account exists
if (azureStorageAccount != "")
{
// Variables
BlobLock blobLock = null;
try
{
// Create a blob lock
blobLock = new BlobLock(azureStorageAccount, "locks", GetLockFilename());
// Do work inside a blob lock
if (blobLock.CreateOrSkip() == true)
{
// Get the database version
if(Int32.TryParse(blobLock.ReadFrom(), out currentDatabaseVersion) == false)
{
currentDatabaseVersion = GetDatabaseVersion();
}
// Upgrade the database
UpgradeDatabaseFromFiles(currentDatabaseVersion);
// Set the new database version
blobLock.WriteTo(DATABASE_VERSION.ToString());
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
// Dispose of the blob lock
if (blobLock != null)
{
blobLock.Dispose();
}
}
}
else
{
// Get the current database version
currentDatabaseVersion = GetDatabaseVersion();
// Upgrade the database
UpgradeDatabaseFromFiles(currentDatabaseVersion);
// Set the new database version
SetDatabaseVersion(DATABASE_VERSION);
}
} // End of the UpgradeDatabase method