protected override async Task <SelectedSnapshot> LoadAsync(string persistenceId, SnapshotSelectionCriteria criteria)
{
IEnumerable <CloudBlockBlob> blobs = _extension
.BlobSnapshotStoreSettings
.GetBlobClient(persistenceId)
.GetContainerReference(_extension.BlobSnapshotStoreSettings.ContainerName)
.ListBlobs(persistenceId, true, BlobListingDetails.All).Cast <CloudBlockBlob>();
var results = blobs.OrderByDescending(t => SnapshotVersionHelper.Parse(t.Name));
if (results.Count() > 0)
{
_log.Debug("Found {0} snapshots for {1}", results.Count(), persistenceId);
foreach (CloudBlockBlob clob in results)
{
if (SnapshotVersionHelper.Parse(clob.Name) <= criteria.MaxSequenceNr &&
long.Parse(clob.Metadata["SnapshotTimestamp"]) <= criteria.MaxTimeStamp.Ticks)
{
using (var memoryStream = new MemoryStream())
{
clob.DownloadToStream(memoryStream);
var snapshot = JsonConvert.DeserializeObject(Encoding.UTF8.GetString(memoryStream.ToArray()),
typeof(SelectedSnapshot), _settings);
return((SelectedSnapshot)snapshot);
}
}
}
return(null);
}
else
{
return(null);
}
}
private IEnumerable <Task> TryDeleteAsync(string persistenceId, SnapshotSelectionCriteria criteria, IOrderedEnumerable <CloudBlockBlob> results)
{
foreach (CloudBlockBlob clob in results)
{
if (SnapshotVersionHelper.Parse(clob.Name) <= criteria.MaxSequenceNr &&
long.Parse(clob.Metadata["SnapshotTimestamp"]) <= criteria.MaxTimeStamp.Ticks)
{
_log.Debug("Found snapshot to remove for {0}", persistenceId);
yield return(clob.DeleteIfExistsAsync());
}
}
}
protected override async Task DeleteAsync(string persistenceId, SnapshotSelectionCriteria criteria)
{
try
{
IEnumerable <CloudBlockBlob> blobs = _extension
.BlobSnapshotStoreSettings
.GetBlobClient(persistenceId)
.GetContainerReference(_extension.BlobSnapshotStoreSettings.ContainerName)
.ListBlobs(persistenceId, true, BlobListingDetails.All).Cast <CloudBlockBlob>();
var results = blobs.OrderByDescending(t => SnapshotVersionHelper.Parse(t.Name));
if (results.Count() > 0)
{
var deleteTasks = TryDeleteAsync(persistenceId, criteria, results);
await Task.WhenAll(deleteTasks);
}
}
catch (Exception ex)
{
_log.Error(ex, ex.Message);
throw;
}
}