/// <summary>
/// Records a new available and accessible data source file in the log.
/// </summary>
public bool Add(DataFileLog log, string addressId, DateTime dateLastUpdated)
{
bool containsEntry;
lock (_syncLock)
{
Guard.ArgumentNotNull(log, nameof(log));
Guard.ArgumentNotNullOrEmptyOrWhiteSpace(addressId, nameof(addressId));
containsEntry = log.Entries
.Any(m =>
string.Equals(addressId, m.AddressId, StringComparison.InvariantCultureIgnoreCase) &&
m.DateLastUpdated == dateLastUpdated);
}
if (!containsEntry)
{
log.Entries.Add(new DataFileLogEntry(addressId, dateLastUpdated));
Save(log); // update log
return(true);
}
else
{
// already added
}
return(false);
}
/// <summary>
/// Updates a given flow log file to match the entries in the target
/// directory.
/// </summary>
/// <param name="log">The log file to update.</param>
/// <returns>True if the log was updated with new entries.</returns>
public bool UpdateLog(DataFileLog log)
{
Guard.ArgumentNotNull(log, nameof(log));
bool hasChanges = false;
foreach (var directory in _sourceDirectories)
{
FileInfo[] files;
if (string.IsNullOrWhiteSpace(log.FileTypes))
{
files = directory.GetFiles();
}
else
{
files = directory.GetFiles(log.FileTypes);
}
foreach (FileInfo file in files)
{
try
{
using (file.OpenRead())
{
// try to read - succeeded
bool added = _repository.Add(log, file.FullName, file.LastWriteTimeUtc);
if (added)
{
hasChanges = added;
}
}
}
catch (Exception ex)
{
if (_logger.IsErrorEnabled)
{
_logger.Error(ex, $"File {file.FullName} was not added to the data source log due to an unexpected error."); // can't read
}
}
}
}
return(hasChanges);
}
/// <summary>
/// Saves the result to the data dir.
/// </summary>
/// <param name="data">
/// The log to save.
/// </param>
public string Save(DataFileLog data)
{
Guard.ArgumentNotNull(data, nameof(data));
lock (_syncLock)
{
CreateDirIfNotExists();
var fileName =
$@"{DataDir}\flow-{data.EntityType.EntityTypeId}-log.json";
if (_logger.IsInfoEnabled)
{
_logger.Info($"Saving data source log to {fileName}.");
}
string body = JsonConvert
.SerializeObject(data, new JsonSerializerSettings());
if (File.Exists(fileName))
{
if (_logger.IsDebugEnabled)
{
_logger.Debug("Backing up old archive file.");
}
// back up older file, don't delete
string backFile = fileName + ".bak";
if (File.Exists(backFile))
{
File.Delete(backFile);
}
File.Move(fileName, backFile);
}
File.WriteAllText(fileName, body);
if (_logger.IsInfoEnabled)
{
_logger.Info($"Saved data source log to {fileName}.");
}
return(fileName);
}
}
