public static void Process(
string fileName,
SegmentProvider segmentProvider,
CompressionMode mode,
long maxCollectionSize,
DataContext dataContext,
SynchronizationContext synchronizationContext)
{
using (var inputStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
while (true)
{
if (synchronizationContext.FinishedReading)
{
break;
}
synchronizationContext.ZipperEvent.WaitOne();
if (dataContext.OutputData.Keys.Count() >= maxCollectionSize)
{
// Too many data is already in queue waiting to be written to output.
// Zipper threads should be stopped to release disk and processor load.
synchronizationContext.ZipperEvent.Reset();
continue;
}
try
{
var indexAndSize = segmentProvider.GetNextIndexAndSize(inputStream);
var index = indexAndSize.Item1;
var size = indexAndSize.Item2;
if (size == 0)
{
synchronizationContext.FinishedReading = true;
dataContext.OutputData[index] = new Segment(new byte[0], true);
break;
}
Trace.TraceInformation(
$"Worker {Thread.CurrentThread.GetHashCode()} processing {index} segment.");
var buffer = new byte[size];
inputStream.Read(buffer, 0, size);
dataContext.OutputData[index] = mode == CompressionMode.Compress
? Compress(buffer)
: Decompress(buffer);
synchronizationContext.WriterEvent.Set();
}
catch (Exception e)
{
Trace.TraceError($" Error: {e.Message}");
throw;
}
}
}
Trace.TraceInformation($"Worker {Thread.CurrentThread.GetHashCode()} stopped processing data.");
}
public void Process()
{
var freeMemory = (long)new PerformanceCounter("Memory", "Available Bytes").NextValue();
freeMemory = Math.Min(freeMemory, 800 * 1024 * 1024); // 800Mb is already 200 segments of data in queue, zippers should be stopped
var bufferSize = 4L * 1024 * 1024;
Trace.TraceInformation($"Free memory: {freeMemory}; Worker limit: {workerThreadLimit}; Buffer size: {bufferSize}");
var maxCollectionMembers = freeMemory / bufferSize;
if (maxCollectionMembers < 1) // rare case
{
maxCollectionMembers = 1;
bufferSize = Math.Min(inputFileName.Length, freeMemory);
}
var dataContext = new DataContext();
var synchronizationContext = new SynchronizationContext();
var segmentProvider = new SegmentProvider(mode == CompressionMode.Decompress, bufferSize);
for (var i = 0; i < workerThreadLimit; i++)
{
var workerThread = new Thread(
() =>
Zipper.Process(
inputFileName,
segmentProvider,
mode,
maxCollectionMembers,
dataContext,
synchronizationContext));
workerThread.Start();
workerThreads.Add(workerThread);
}
using (var outStream = new FileStream(this.outputFileName, FileMode.Create))
{
writerThread = new Thread(
() =>
Writer.Write(
outStream,
mode == CompressionMode.Compress,
dataContext,
synchronizationContext));
writerThread.Start();
writerThread.Join();
}
}
