/// <summary>
/// Gets the snapshot for the given stream/bucket
/// </summary>
/// <param name="bucketId"></param>
/// <param name="streamId"></param>
/// <param name="maxRevision"></param>
/// <returns></returns>
public ISnapshot GetSnapshot(string bucketId, string streamId, int maxRevision)
{
ISnapshot snapshot = null;
var snapshotPageBlob = WrappedPageBlob.GetAssumingExists(_primaryContainer, bucketId + "/ss/" + streamId);
if (snapshotPageBlob != null)
{
var snapshotSize = Convert.ToInt32(snapshotPageBlob.Metadata["ss_data_size_bytes"]);
var snapshotRevision = Convert.ToInt32(snapshotPageBlob.Metadata["ss_stream_revision"]);
if (snapshotRevision <= maxRevision && snapshotSize != 0)
{
var snapshotBytes = snapshotPageBlob.DownloadBytes(0, snapshotSize);
var snapshotObject = _serializer.Deserialize <object>(snapshotBytes);
snapshot = new Snapshot(bucketId, streamId, snapshotRevision, snapshotObject);
}
else
{
Logger.Info("Snapshot exists for stream [{0}] at revision [{1}] but not being returned because max revision desired was [{2}]",
streamId, snapshotRevision, maxRevision);
}
}
return(snapshot);
}
/// <summary>
/// Marks a stream Id's commit as dispatched.
/// </summary>
/// <param name="commit">The commit object to mark as dispatched.</param>
public void MarkCommitAsDispatched(ICommit commit)
{
AddCheckpointTableEntry(commit);
var pageBlob = WrappedPageBlob.GetAssumingExists(_primaryContainer, commit.BucketId + "/" + commit.StreamId);
HeaderDefinitionMetadata headerDefinition = null;
var header = GetHeaderWithRetry(pageBlob, out headerDefinition);
// we must commit at a page offset, we will just track how many pages in we must start writing at
foreach (var commitDefinition in header.PageBlobCommitDefinitions)
{
if (commit.CommitId == commitDefinition.CommitId)
{
commitDefinition.IsDispatched = true;
--header.UndispatchedCommitCount;
}
}
CommitNewMessage(pageBlob, null, header, headerDefinition,
headerDefinition.HeaderStartLocationOffsetBytes);
}
