/// <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
{
BucketId = attempt.BucketId,
CommitId = attempt.CommitId,
CommitSequence = attempt.CommitSequence,
CommitStampUtc = attempt.CommitStamp,
Events = attempt.Events.ToList(),
Headers = attempt.Headers,
StreamId = attempt.StreamId,
StreamRevision = attempt.StreamRevision,
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));
}
/// <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));
}