// Methods
public (Byte[] Result, DeltaFileTransaction Transaction) Restore(FileNode node, LogEntry entry)
{
Byte[] result = null;
Byte[] lastRead = null;
var logEntries = node.LogEntries.Where(x => x.CreatedAt <= entry.CreatedAt);
var strategy = _fileHandlingStrategySelector.Select(node);
foreach (var current in logEntries)
{
switch (current.Type)
{
case LogEntryTypes.Genesis:
result = _archiveManager.Read(node.FileName, node);
break;
case LogEntryTypes.Normal:
var delta = _archiveManager.Read(current.DiffName, node);
lastRead = result;
result = _deltaPatcher.Patch(result, delta);
break;
default:
break;
}
}
var newSignature = _signatureCreator.CreateSignature(result);
var newDelta = _deltaCreator.BuildDelta(newSignature, lastRead);
var transaction = new DeltaFileTransaction(node,
new Signature($"{Guid.NewGuid().ToString()}.signature", newSignature),
new Delta($"{Guid.NewGuid().ToString()}.delta", newDelta));
return(result, transaction);
}
private async Task Watcher_FileChanged(FileInfo fileInfo)
{
var node = _configuration.FirstOrDefault(x => Path.Combine(x.Directory, x.FileName) == fileInfo.FullName);
var strategy = _fileHandlingStrategySelector.Select(node);
strategy.Handled += Strategy_Handled;
await strategy.HandleAsync(node);
OnNodeUpdated(node);
}