protected override void WriteToDisk()
{
try
{
using (var outFileStream = new FileStream(OutFileName, FileMode.Create))
{
OutFileStream = outFileStream;
//write all decompressed data chunks to disk
for (var chunkNumber = 0; !(IncomingFinished && chunkNumber == ChunkCounter); chunkNumber++)
{
if (StopRequested)
{
return;
}
//waiting for the next chunk to write to disk
while (true)
{
if (StopRequested)
{
return;
}
KeyValuePair <int, byte[]> chunk;
lock (Locker)
chunk = OutgoingChunks.FirstOrDefault(b => b.Key == chunkNumber);
if (chunk.Value != null)
{
outFileStream.Write(chunk.Value, 0, chunk.Value.Length);
lock (Locker)
OutgoingChunks.Remove(chunk.Key);
//force gc cleanup of processed bytes
GC.Collect(2, GCCollectionMode.Forced);
break;
}
Thread.Sleep(100);
}
}
var elapsed = DateTime.Now - StartTime;
Console.Write("Decompression was completed. Elapsed time is {0}ms", elapsed);
}
}
catch (Exception ex)
{
StopRequested = true;
Console.Write("There is the problem at the decompression process:{0}", ex.Message);
}
}
//compress data chunk
protected override void ProcessChunk(int chunkNumber)
{
if (StopRequested)
{
return;
}
ProcessSemaphore.WaitOne();
try
{
KeyValuePair <int, byte[]> chunk;
lock (Locker)
chunk = IncomingChunks.FirstOrDefault(b => b.Key == chunkNumber);
//stream for processed data
using (var outMemStream = new MemoryStream())
{
using (var zipStream = new GZipStream(outMemStream, CompressionMode.Compress))
{
using (var inMemStream = new MemoryStream(chunk.Value, 0, chunk.Value.Length))
{
inMemStream.CopyTo(zipStream);
}
}
//compressed bytes
var bytes = outMemStream.ToArray();
lock (Locker)
{
//add new data chunk to collection of compressed data
OutgoingChunks.Add(chunkNumber, bytes);
//remove chunk from collection of uncompressed data
IncomingChunks.Remove(chunkNumber);
}
}
}
catch (Exception ex)
{
StopRequested = true;
Console.Write("There is an exception at the compressing process: {0}", ex.Message);
}
ProcessSemaphore.Release();
//if this is the first chunk - start writing to disk in a separate thread
if (chunkNumber == 0 && WritingThread.ThreadState != ThreadState.Running && !StopRequested)
{
WritingThread.Start();
}
}
