private void AcquireBlobLease(LeaseTakingPolicy policy)
{
string ProposedLeaseId = Guid.NewGuid().ToString();
bool isDone = false;
// if policy == LeaseTakingPolicy.TryUntilSuccessful then loop indefinitely
while (!isDone)
{
try
{
LeaseId = blob.AcquireLease(null, ProposedLeaseId);
HasLease = true;
isDone = true;
}
catch (StorageException ex)
{
HasLease = false;
if (StorageExceptionCode.Conflict(ex)) //Conflict
{
if (policy == LeaseTakingPolicy.TryOnce)
{
isDone = true;
}
}
else
{
ReleaseBlobLease();
throw;
}
}
}
}
/// <summary>
/// Trys to acquire the lease on a blob.
/// Note that the caller must check HasLease to see whether the acquisition succeeded.
/// </summary>
/// <param name="blob">Particular blob we would like to take the lease on</param>
/// <param name="policy">Whether to try once or many times</param>
/// <returns>An instance of the CloudBlobLease object.</returns>
public CloudBlobLease(ICloudBlob blob, LeaseTakingPolicy policy)
{
this.blob = blob;
AcquireBlobLease(policy);
}
/// <summary>
/// Trys to acquire the lease on the configuration blob.
/// Note that the caller must check HasLease to see whether the acquisition succeeded.
/// </summary>
/// <param name="containerName">Name of the container/configuration</param>
/// <param name="policy">Whether to try once or many times</param>
/// <returns>An instance of the CloudBlobLease object.</returns>
public CloudBlobLease(string containerName, LeaseTakingPolicy policy)
{
this.blob = ClientRegistry.GetConfigurationContainer(containerName).GetBlockBlobReference(ConstPool.CURRENT_CONFIGURATION_BLOB_NAME);
AcquireBlobLease(policy);
}
