public static Cancellation CreateLinked(Cancellation source)
{
var cancellation = new Cancellation();
source.RegisterCallback(() =>
{
cancellation.Cancel();
});
return cancellation;
}
// As Short As I Was Able
public void CompressAsaiwa(Stream src, Stream dst)
{
_cancellation = new Cancellation();
var compressed = StreamPortion.SplitStream(src, PortionLengthBytes)
.SelectParallellyAsaiwa(portion => CompressedPortion.Compress(portion), _cancellation, PrereadBufferSizePcs, OutputBufferSizePcs);
foreach (var chunk in compressed)
{
chunk.WriteCompressedTo(dst);
OnProgressChanged();
}
}
public void Decompress(Stream src, Stream dst)
{
_cancellation = new Cancellation();
var decompressed = CompressedPortion.ReadAllFrom(src)
.Buffered(_cancellation, PrereadBufferSizePcs) // This line is optional but for certain reasons it increses CPU utilization.
.SelectParallely(chunk => chunk.Decompress(), _cancellation)
.WithBoundedOutputCapacity(OutputBufferSizePcs); // This line prevents OutOfMemmoryException on large files or with slow output disk storages.
foreach (var portion in decompressed)
{
portion.WriteToItsPlace(dst);
OnProgressChanged();
}
}
// Тут две реализации (две пары методов Compress-Decompress): подлиннее и покороче
public void Compress(Stream src, Stream dst)
{
_cancellation = new Cancellation();
var compressed = StreamPortion.SplitStream(src, PortionLengthBytes)
.Buffered(_cancellation, PrereadBufferSizePcs) // This line is optional but for certain reasons it increses CPU utilisation.
.SelectParallely(portion => CompressedPortion.Compress(portion), _cancellation)
.WithBoundedOutputCapacity(OutputBufferSizePcs); // This line prevents OutOfMemmoryException on large files or with slow output disk storages.
foreach (var chunk in compressed)
{
chunk.WriteCompressedTo(dst);
OnProgressChanged();
}
}
public void TestCancelStuckEnumerable()
{
var lastValue = -1;
var cancellation = new Cancellation();
var stickWhileEvent = new ManualResetEvent(false);
var ints = new DisposableEnumerator<int>(StuckDownEnumerable(stickWhileEvent));
var select = ints
.SelectParallely(i => Interlocked.Exchange(ref lastValue, i), cancellation);
new Thread(() =>
{
Thread.Sleep(100);
cancellation.Cancel();
}).Start();
AssertEx.Throws<OperationCanceledException>(() => select.AsEnumerable().ToList());
Assert.AreEqual(1, lastValue);
stickWhileEvent.Set();
Thread.Sleep(100);
Assert.IsTrue(ints.IsDisposed);
}
public void TestCancel()
{
bool? cancelled = null;
var lastEnumerated = -1;
var lastProcessed = -1;
var cancellation = new Cancellation();
var endlessSource = Enumerable.Range(0, 10).Select(n =>
{
if (n > 3)
TestMonitorSimple.WaitAlittle();
lastEnumerated = n;
return n;
});
var doForAll = new ForAll<int>(endlessSource, n => Thread.VolatileWrite(ref lastProcessed, n),
new ParallelSettings {Cancellation = cancellation});
doForAll.RegisterOnfinished(f => cancelled = f.IsCancelled);
doForAll.Start();
TestMonitorSimple.WaitAlittle();
cancellation.Cancel();
TestMonitorSimple.WaitAlittle();
AssertEx.Throws<OperationCanceledException>(() => doForAll.Wait());
Assert.IsTrue(lastProcessed > -1, "Looks like processing had not even started");
Assert.IsTrue(lastEnumerated > -1, "Looks like enumeration of source had not even started");
Assert.IsTrue(cancelled != null && cancelled.Value);
Assert.IsTrue(doForAll.IsCancelled);
Assert.IsTrue(lastProcessed < 9);
Assert.IsTrue(lastEnumerated < 9);
}
public void TestSelectParallelCancellation()
{
var cancellation = new Cancellation();
var maxNumber = 0;
var selectResult = Enumerable.Range(0, int.MaxValue).SelectParallely(i =>
{
maxNumber = i;
Thread.Sleep(1);
return i;
}, cancellation);
cancellation.Cancel();
AssertEx.Throws<OperationCanceledException>(() => selectResult.AsEnumerable().ToList());
Assert.IsTrue(maxNumber < int.MaxValue-1);
}
public void DecompressAsaiwa(Stream src, Stream dst)
{
_cancellation = new Cancellation();
var decompressed = CompressedPortion.ReadAllFrom(src)
.SelectParallellyAsaiwa(chunk => chunk.Decompress(), _cancellation, PrereadBufferSizePcs, OutputBufferSizePcs);
foreach (var portion in decompressed)
{
portion.WriteToItsPlace(dst);
OnProgressChanged();
}
}
protected virtual void DoWork(Cancellation cancellation, int workersTotal, int thisWorkerIndex)
{
}
