/// <summary>
/// Accepts incoming isolated commit
/// </summary>
/// <param name="isolatedChangeSet">Isolated changeset</param>
/// <returns>Appended changes</returns>
public CommitResult <Guid> AcceptCommit(IsolatedChangeSet <Guid, object, EdgeData> isolatedChangeSet)
{
lock (commitSync)
{
var latestSnapshot = snapshotsService.GetLatestSnapshotId();
if (latestSnapshot.Equals(isolatedChangeSet.SourceSnapshotId))
{
AppendableChangeSet <Guid, object, EdgeData> appendableChangeSet = CreateAppendableChangeSet(isolatedChangeSet.SourceSnapshotId, Guid.NewGuid(), isolatedChangeSet);
// Commit is directly on the last snapshot
CommitDirect(appendableChangeSet);
return(new CommitResult <Guid>(appendableChangeSet.DestinationSnapshotId, appendableChangeSet.Mapping));
}
else
{
// There are snapshots in between
#if DEBUG
Debug.WriteLine("Source snapshot = " + isolatedChangeSet.SourceSnapshotId);
#endif
// Calculate changes between last snapshot and source snapshot
var intermediateChanges = ChangesBetween(isolatedChangeSet.SourceSnapshotId, latestSnapshot);
// Isolate portion of the last snapshot which is relevant for the change set
var subTree = IsolateSubTree(latestSnapshot, isolatedChangeSet, intermediateChanges);
// Create a brand new changeset which is compatible with last snapshot
// Do this by recursive walk through the last snapshot and perform the "compatible" operations done in the incomming changeset
var mergedChangeSet = CreateMergedChangeSet(latestSnapshot, subTree, isolatedChangeSet, intermediateChanges);
// When complete perform the CommitDirect of the new changeset
CommitDirect(mergedChangeSet);
// Start with created change mapping
var mapping = mergedChangeSet.Mapping;
// Merge intermediate changes items to it
foreach (var item in intermediateChanges)
{
AddChangeItem(mapping, item.Key, item.Value);
}
return(new CommitResult <Guid>(mergedChangeSet.DestinationSnapshotId, mapping));
}
}
}
