private int CalculateQueueLength()
{
var queueLength = 0;
var serializer = new QueueRecordSerializer();
foreach (var file in _files)
{
var startPosition = 0;
var positionFile = file.Replace(".dat", ".position");
if (FileExists(positionFile))
{
using (
var stream = new FileStream(positionFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite,
16384, FileOptions.SequentialScan))
{
if (stream.Length > 4)
{
stream.Position = stream.Length - 4;
var intBuffer = new byte[4];
var pos = stream.Read(intBuffer, 0, 4);
startPosition = BitConverter.ToInt32(intBuffer, 0);
}
}
}
using (
var stream = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 16384,
FileOptions.SequentialScan))
{
stream.Position = startPosition;
while (true)
{
var record = serializer.Read(stream);
if (record != null)
{
++queueLength;
}
else
{
break;
}
}
}
}
return(queueLength);
}