/// <summary>
/// Creates a Commit object from an AzureBlobEntry.
/// </summary>
/// <param name="blobEntry">The source AzureBlobEntry.</param>
/// <returns>The populated Commit.</returns>
private ICommit CreateCommitFromAzureBlobCommit(AzureBlobCommit blobEntry)
{
return(new Commit(blobEntry.BucketId,
blobEntry.StreamId,
blobEntry.StreamRevision,
blobEntry.CommitId,
blobEntry.CommitSequence,
blobEntry.CommitStampUtc,
blobEntry.Checkpoint.ToString(),
blobEntry.Headers,
blobEntry.Events));
}
/// <summary>
/// Adds a commit to a stream.
/// </summary>
/// <param name="attempt">The commit attempt to be added.</param>
/// <returns>An Commit if successful.</returns>
public ICommit Commit(CommitAttempt attempt)
{
var pageBlob = WrappedPageBlob.CreateNewIfNotExists(_primaryContainer, attempt.BucketId + "/" + attempt.StreamId, _options.BlobNumPages);
HeaderDefinitionMetadata headerDefinitionMetadata = null;
var header = GetHeaderWithRetry(pageBlob, out headerDefinitionMetadata);
// we must commit at a page offset, we will just track how many pages in we must start writing at
var startPage = 0;
foreach (var commit in header.PageBlobCommitDefinitions)
{
if (commit.CommitId == attempt.CommitId)
{
throw new DuplicateCommitException("Duplicate Commit Attempt");
}
startPage += commit.TotalPagesUsed;
}
if (attempt.CommitSequence <= header.LastCommitSequence)
{
throw new ConcurrencyException("Concurrency exception in Commit");
}
var blobCommit = new AzureBlobCommit();
blobCommit.BucketId = attempt.BucketId;
blobCommit.CommitId = attempt.CommitId;
blobCommit.CommitSequence = attempt.CommitSequence;
blobCommit.CommitStampUtc = attempt.CommitStamp;
blobCommit.Events = attempt.Events.ToList();
blobCommit.Headers = attempt.Headers;
blobCommit.StreamId = attempt.StreamId;
blobCommit.StreamRevision = attempt.StreamRevision;
blobCommit.Checkpoint = GetNextCheckpoint();
var serializedBlobCommit = _serializer.Serialize(blobCommit);
header.AppendPageBlobCommitDefinition(new PageBlobCommitDefinition(serializedBlobCommit.Length, attempt.CommitId, attempt.StreamRevision,
attempt.CommitStamp, header.PageBlobCommitDefinitions.Count, startPage, blobCommit.Checkpoint));
++header.UndispatchedCommitCount;
header.LastCommitSequence = attempt.CommitSequence;
CommitNewMessage(pageBlob, serializedBlobCommit, header, headerDefinitionMetadata, startPage * _blobPageSize);
return(CreateCommitFromAzureBlobCommit(blobCommit));
}
