/// <summary>
/// Increment the sequence number of the event stream
/// </summary>
private async Task IncrementSequence(string writeStreamLeaseId = "")
{
if (null != EventStreamBlob)
{
bool exists = await EventStreamBlob.ExistsAsync();
if (exists)
{
await EventStreamBlob.FetchAttributesAsync();
int sequenceNumber;
if (int.TryParse(EventStreamBlob.Metadata[METADATA_SEQUENCE], out sequenceNumber))
{
sequenceNumber += 1;
EventStreamBlob.Metadata[METADATA_SEQUENCE] = $"{sequenceNumber }";
// and commit it back
AccessCondition condition = AccessCondition.GenerateEmptyCondition();
if (!string.IsNullOrWhiteSpace(writeStreamLeaseId))
{
condition.LeaseId = writeStreamLeaseId;
}
await EventStreamBlob.SetMetadataAsync(condition, null, new Microsoft.Azure.Storage.OperationContext());
}
}
}
}
/// <summary>
/// Make sure the blob info attributes are up to date
/// </summary>
/// <remarks>
/// This is similar in concept to FileSystemInfo.Refresh
/// </remarks>
public async Task Refresh()
{
if (EventStreamBlob != null)
{
bool exists = await EventStreamBlob.ExistsAsync();
if (exists)
{
// just refresh the attributes
await EventStreamBlob.FetchAttributesAsync();
}
else
{
exists = await EventStreamBlob.Container.ExistsAsync();
if (!exists)
{
await EventStreamBlob.Container.CreateAsync();
}
await EventStreamBlob.CreateOrReplaceAsync();
// Set the original metadata
EventStreamBlob.Metadata[METATDATA_DOMAIN] = DomainName;
EventStreamBlob.Metadata[METADATA_ENTITY_TYPE_NAME] = EntityTypeName;
EventStreamBlob.Metadata[METADATA_INSTANCE_KEY] = InstanceKey;
EventStreamBlob.Metadata[METADATA_SEQUENCE] = @"0";
EventStreamBlob.Metadata[METADATA_DATE_CREATED] = DateTime.UtcNow.ToString("O");
// and commit it back
await EventStreamBlob.SetMetadataAsync();
}
}
}