public async Task Test_31_Blob_withInfiniteLease()
{
CloudBlobContainer cbc = _Client.GetContainerReference("test-append-blob-container");
await cbc.CreateIfNotExistsAsync();
CloudAppendBlob blob = cbc.GetAppendBlobReference("test-append-blob-withlease2.data");
var blobExists = await blob.ExistsAsync();
if (!blobExists)
{
await blob.CreateOrReplaceAsync();
}
string data = string.Empty.PadLeft(64 * 1024, '*');
string leaseIdGuid = Guid.NewGuid().ToString();
var oc = new OperationContext();
var ac = new AccessCondition();
var leaseID = await blob.AcquireLeaseAsync(null, leaseIdGuid, ac, null, null);
ac.LeaseId = leaseID;
try
{
for (int ix = 0; ix < 10; ix++)
{
await blob.AppendTextAsync(data, null, ac, null, oc);
}
}
finally
{
await blob.ReleaseLeaseAsync(ac, null, oc);
}
}
private async static void AcquireLeaseDemo()
{
try
{
string name = "LeaseDemo/text-0221e06e5e254fb3bb0bf0e37d9d0e32.txt";
CloudBlobContainer container = _cloudBlobClient.GetContainerReference("text-files");
await container.CreateIfNotExistsAsync();
CloudAppendBlob cloudAppendBlob = container.GetAppendBlobReference(name);
bool shouldContinue = true;
if (await cloudAppendBlob.ExistsAsync())
{
if (cloudAppendBlob.Properties.LeaseStatus == LeaseStatus.Locked)
{
shouldContinue = false;
Console.WriteLine("Blob is currently in lease");
}
else
{
await cloudAppendBlob.CreateOrReplaceAsync();
}
}
if (shouldContinue)
{
string proposedLeaseId = Guid.NewGuid().ToString("n");
AccessCondition accessCondition = new AccessCondition();
OperationContext operationContext = new OperationContext();
Console.WriteLine("Acquiring lock...");
string leaseId = await cloudAppendBlob.AcquireLeaseAsync(null, proposedLeaseId, accessCondition, null, operationContext);
accessCondition.LeaseId = leaseId;
try
{
Console.WriteLine("Uploading text...");
for (int i = 0; i <= 50; i++)
{
await cloudAppendBlob.AppendTextAsync($"{Guid.NewGuid().ToString("n")}{Environment.NewLine}", UTF8Encoding.UTF8, accessCondition, null, operationContext);
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
finally
{
await cloudAppendBlob.ReleaseLeaseAsync(accessCondition, null, operationContext);
Console.WriteLine("Process finished. Lock has been released");
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
public async Task Test_30_Blob_InfiniteLease()
{
// Containers are like folders
CloudBlobContainer container = _client.GetContainerReference("test-append-blob-container");
await container.CreateIfNotExistsAsync();
// Blobs are like files
CloudAppendBlob blob = container.GetAppendBlobReference("test-append-blob-with-lease");
var blobExists = await blob.ExistsAsync();
if (!blobExists)
{
await blob.CreateOrReplaceAsync();
}
string data = string.Empty.PadLeft(64 * 1024, '*');
string leaseId = Guid.NewGuid().ToString();
var operationContext = new OperationContext();
var accessCondition = new AccessCondition();
// For pessimistic access control
// Acquire lease
var leaseID = await blob.AcquireLeaseAsync(null, leaseId, accessCondition, null, operationContext);
accessCondition.LeaseId = leaseID;
try
{
// Make modifications based on that lease
for (int i = 0; i < 1000; i++)
{
await blob.AppendTextAsync(data, null, accessCondition, null, operationContext);
}
}
finally
{
// And finally release that lease
await blob.ReleaseLeaseAsync(accessCondition, null, operationContext);
}
}
/// <inheritdoc />
public Task <string> AcquireLeaseAsync(TimeSpan?leaseTime, string proposedLeaseId,
CancellationToken cancellationToken)
{
return(_sdk.AcquireLeaseAsync(leaseTime, proposedLeaseId, cancellationToken));
}
/// <inheritdoc />
public Task <string> AcquireLeaseAsync(TimeSpan?leaseTime, string proposedLeaseId,
CancellationToken cancellationToken)
{
return(_sdk.AcquireLeaseAsync(leaseTime, proposedLeaseId, accessCondition: null, options: null, operationContext: null, cancellationToken: cancellationToken));
}
