public FileReplicationState GetOrCreateFileState(string sourceFileName)
{
var key = sourceFileName.ToLowerInvariant();
_fileStates.TryGetValue(key, out var result);
if (result == null)
{
_fileStates[key] = result = new FileReplicationState(sourceFileName);
}
return(result);
}
private void Replicate(FileInfo sourceFile, FileReplicationState state, ref IDataStore target)
{
_trace.TraceVerbose("Verifying for modifications inbound file: {0}.", sourceFile.FullName);
var source = new FileStore(sourceFile);
var lastReadLink = state.LastReadLink;
var lastReplicated = GetLastReplicatedItem(lastReadLink, source, ref target, out var isLinkValid);
var changeDetected = false;
for ( ;;)
{
var newItem = source.GetNext(lastReplicated);
if (newItem == source.Eof)
{
break;
}
if (changeDetected == false)
{
_trace.TraceInformation("Changes detected at {0}. Importing...", sourceFile.FullName);
changeDetected = true;
}
string stateTag = null;
ResolveTargetStoreIfNeeded(ref target);
target.Write(ref stateTag, newItem.Payload);
lastReplicated = newItem;
}
if (!changeDetected)
{
_trace.TraceVerbose("No change detected.");
if (isLinkValid)
{
return;
}
_trace.TraceInformation("Attempting to fix last read link...");
}
state.LastReadLink = source.CreateLink(lastReplicated);
if (!isLinkValid)
{
source.ResolveLink(state.LastReadLink);
}
}
public void Read()
{
if (!_fileInfo.Exists)
{
_trace.TraceInformation("Replication state file not found: {0}. Assuming empty state.", _fileInfo.FullName);
return;
}
_trace.TraceVerbose("Reading replication state file: {0}", _fileInfo.FullName);
using (var stream = new FileStream(_fileInfo.FullName, FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Delete))
using (var reader = new BinaryReader(stream, Encoding.UTF8, true))
{
var count = reader.ReadInt32();
while (count > 0)
{
var fileState = new FileReplicationState(reader);
_fileStates[fileState.Name] = fileState;
--count;
}
}
}