/// <inheritdoc/>
public async ValueTask <bool> WaitToReadAsync(CancellationToken cancellationToken = default)
{
Task <VoidResult> taskToAwait = null;
using (var seqGuard = new SequentialUsageGuard(this))
{
using (var guard = new StateReadGuard <TSyncObject>(_syncObject, _owner))
{
seqGuard.OnStateGuardEntered();
if (guard.GetAvailableDataForReading() == 0)
{
taskToAwait = _owner._dataAvailableCs?.Task;
}
}
if (taskToAwait != null)
{
await taskToAwait;
}
// it's safe to use shadow.
return(!_owner._isCompleted);
}
}
/// <inheritdoc/>
public bool TryRead(int count, out ArraySegment <T> items)
{
if (count <= 0)
{
throw new ArgumentOutOfRangeException(nameof(count), "Count should be non-zero positive.");
}
using (var guard = new StateReadGuard <TSyncObject>(_syncObject, _owner))
{
EnsureSequentialUsage();
int dataAvailable = guard.GetAvailableDataForReading();
if (dataAvailable == 0)
{
items = default;
return(false);
}
LinkedListNode <SliceEntry> curNode = _owner._sliceEntries.Last;
while (curNode != null)
{
var sliceEntry = curNode.Value;
if (sliceEntry.Status == SliceEntryStatus.Data)
{
Debug.Assert(sliceEntry.Length != 0, "sliceEntry.Length != 0");
int amountToRead = Math.Min(sliceEntry.Length, count);
guard.NotifyRead(amountToRead);
items = new ArraySegment <T>(sliceEntry.Buffer, sliceEntry.Start, amountToRead);
if (amountToRead == sliceEntry.Length)
{
_owner._sliceEntries.Remove(curNode);
}
else
{
sliceEntry.Start += amountToRead;
sliceEntry.Length -= amountToRead;
}
return(true);
}
curNode = curNode.Next;
}
Debug.Assert(false, "Counters are not corresponding to the slice entries list.");
throw new InvalidOperationException("Impossible state!");
}
}
/// <inheritdoc/>
public bool TryRead(out T item)
{
using (var guard = new StateReadGuard <TSyncObject>())
{
EnsureSequentialUsage();
if (guard.GetAvailableDataForReading() == 0)
{
item = default;
return(false);
}
LinkedListNode <SliceEntry> curNode = _owner._sliceEntries.Last;
// Searching for node to read from
while (curNode != null)
{
var sliceEntry = curNode.Value;
if (sliceEntry.Status == SliceEntryStatus.Data)
{
Debug.Assert(sliceEntry.Length != 0, "sliceEntry.Length != 0");
guard.NotifyRead(1);
item = sliceEntry.Buffer[sliceEntry.Start++];
// Removing empty nodes.
if (--sliceEntry.Length == 0)
{
_owner._sliceEntries.Remove(curNode);
}
return(true);
}
curNode = curNode.Next;
}
Debug.Assert(false, "Available data counter does not corresponds to slice entries.");
item = default;
return(false);
}
}
/// <inheritdoc/>
public async ValueTask <ArraySegment <T> > ReadAsync(int count, CancellationToken cancellationToken)
{
if (count <= 0)
{
throw new ArgumentOutOfRangeException(nameof(count), "Count should be non-zero positive.");
}
using (var seqGuard = new SequentialUsageGuard(this))
{
while (true)
{
Task <VoidResult> taskToAwait;
using (var guard = new StateReadGuard <TSyncObject>(_syncObject, _owner))
{
int dataAvailable = guard.GetAvailableDataForReading();
if (dataAvailable == 0)
{
_owner.VerifyChannelNotClosed();
seqGuard.OnStateGuardEntered();
Debug.Assert(_owner._dataAvailableCs != null, "_owner._dataAvailableCs != null");
taskToAwait = _owner._dataAvailableCs.Task;
}
else
{
seqGuard.OnStateGuardEntered();
LinkedListNode <SliceEntry> curNode = _owner._sliceEntries.Last;
while (curNode != null)
{
var sliceEntry = curNode.Value;
if (sliceEntry.Status == SliceEntryStatus.Data)
{
Debug.Assert(sliceEntry.Length != 0, "sliceEntry.Length != 0");
int amountToRead = Math.Min(sliceEntry.Length, count);
guard.NotifyRead(amountToRead);
var items = new ArraySegment <T>(
sliceEntry.Buffer,
sliceEntry.Start,
amountToRead);
if (amountToRead == sliceEntry.Length)
{
_owner._sliceEntries.Remove(curNode);
}
else
{
sliceEntry.Start += amountToRead;
sliceEntry.Length -= amountToRead;
}
return(items);
}
curNode = curNode.Next;
}
Debug.Assert(false, "Counters are not corresponding to the slice entries list.");
throw new InvalidOperationException("Impossible state!");
}
}
await taskToAwait.WithCancellation(cancellationToken);
}
}
}
/// <inheritdoc/>
public int TryRead(Span <T> outBuffer)
{
using (var guard = new StateReadGuard <TSyncObject>())
{
EnsureSequentialUsage();
if (outBuffer.Length == 0)
{
return(0);
}
int availableDataCount = guard.GetAvailableDataForReading();
if (availableDataCount == 0)
{
return(0);
}
int amountToRead = Math.Min(availableDataCount, outBuffer.Length);
guard.NotifyRead(amountToRead);
int readCount = amountToRead;
int outPosition = 0;
// Searching for node to read from
LinkedListNode <SliceEntry> curNode = _owner._sliceEntries.Last;
while ((curNode != null) && (amountToRead != 0))
{
var sliceEntry = curNode.Value;
if (sliceEntry.Status == SliceEntryStatus.Data)
{
Debug.Assert(sliceEntry.Length != 0, "sliceEntry.Length != 0");
int readChunkLength = Math.Min(amountToRead, curNode.Value.Length);
for (int i = 0; i < readChunkLength; i++)
{
outBuffer[outPosition++] = sliceEntry.Buffer[i + sliceEntry.Start];
}
amountToRead -= readChunkLength;
if (readChunkLength == curNode.Value.Length)
{
var nodeToRemove = curNode;
curNode = curNode.Next;
_owner._sliceEntries.Remove(nodeToRemove);
continue;
}
curNode.Value.Start += readChunkLength;
curNode.Value.Length -= readChunkLength;
}
curNode = curNode.Next;
}
return(readCount);
}
}
/// <inheritdoc/>
public async ValueTask <ChannelReaderBufferSlice <T> > StartReadAsync(
int count,
CancellationToken cancellationToken = default)
{
if (count <= 0)
{
throw new ArgumentOutOfRangeException(nameof(count), "Count should be non-zero positive.");
}
bool isReadStarted = false;
while (true)
{
Task <VoidResult> taskToAwait;
using (var guard = new StateReadGuard <TSyncObject>())
{
if (!isReadStarted)
{
EnsureSequentialUsage();
_readInProgress = true;
isReadStarted = true;
}
int nonAllocatedLength = guard.GetAvailableDataForReading();
if (nonAllocatedLength == 0)
{
try
{
_owner.VerifyChannelNotClosed();
}
catch
{
_readInProgress = false;
throw;
}
Debug.Assert(_owner._dataAvailableCs != null, "_owner._dataAvailableCs != null");
taskToAwait = _owner._dataAvailableCs.Task;
}
else
{
LinkedListNode <SliceEntry> curNode = _owner._sliceEntries.Last;
// Searching for node to read from
while (curNode != null)
{
var sliceEntry = curNode.Value;
if (sliceEntry.Status == SliceEntryStatus.Data)
{
Debug.Assert(sliceEntry.Length != 0, "sliceEntry.Length != 0");
int allocateForReadLength = Math.Min(count, sliceEntry.Length);
guard.NotifyAllocatedForReading(allocateForReadLength);
if (allocateForReadLength == sliceEntry.Length)
{
sliceEntry.Status = SliceEntryStatus.AllocatedForRead;
return(new ChannelReaderBufferSlice <T>(
sliceEntry.Buffer,
sliceEntry.Start,
sliceEntry.Length,
sliceEntry.Id));
}
int freeSpaceLeft = sliceEntry.Length - allocateForReadLength;
sliceEntry.Length -= freeSpaceLeft;
sliceEntry.Status = SliceEntryStatus.AllocatedForRead;
var newEntry = _owner.AllocateEmptyEntryAfter(curNode);
newEntry.Buffer = sliceEntry.Buffer;
newEntry.Start = sliceEntry.Start + allocateForReadLength;
newEntry.Length = freeSpaceLeft;
newEntry.Status = SliceEntryStatus.Data;
return(new ChannelReaderBufferSlice <T>(
sliceEntry.Buffer,
sliceEntry.Start,
sliceEntry.Length,
sliceEntry.Id));
}
curNode = curNode.Next;
}
Debug.Assert(false, "Available data counter does not corresponds to slice entries.");
throw new InvalidOperationException("Impossible state!");
}
}
await taskToAwait.WithCancellation(cancellationToken);
}
}
/// <inheritdoc/>
public ChannelReaderBufferSlice <T> TryStartRead(int count)
{
if (count <= 0)
{
throw new ArgumentOutOfRangeException(nameof(count), "Count should be non-zero positive.");
}
using (var guard = new StateReadGuard <TSyncObject>())
{
EnsureSequentialUsage();
int nonAllocatedLength = guard.GetAvailableDataForReading();
if (nonAllocatedLength == 0)
{
return(new ChannelReaderBufferSlice <T>(EmptyBuffer, 0, 0, 0));
}
LinkedListNode <SliceEntry> curNode = _owner._sliceEntries.Last;
// Searching for node to read from
while (curNode != null)
{
var sliceEntry = curNode.Value;
if (sliceEntry.Status == SliceEntryStatus.Data)
{
Debug.Assert(sliceEntry.Length != 0, "sliceEntry.Length != 0");
int allocateForReadLength = Math.Min(count, sliceEntry.Length);
guard.NotifyAllocatedForReading(allocateForReadLength);
if (allocateForReadLength == sliceEntry.Length)
{
sliceEntry.Status = SliceEntryStatus.AllocatedForRead;
return(new ChannelReaderBufferSlice <T>(
sliceEntry.Buffer,
sliceEntry.Start,
sliceEntry.Length,
sliceEntry.Id));
}
int freeSpaceLeft = sliceEntry.Length - allocateForReadLength;
sliceEntry.Length -= freeSpaceLeft;
sliceEntry.Status = SliceEntryStatus.AllocatedForRead;
var newEntry = _owner.AllocateEmptyEntryAfter(curNode);
newEntry.Buffer = sliceEntry.Buffer;
newEntry.Start = sliceEntry.Start + allocateForReadLength;
newEntry.Length = freeSpaceLeft;
newEntry.Status = SliceEntryStatus.Data;
return(new ChannelReaderBufferSlice <T>(
sliceEntry.Buffer,
sliceEntry.Start,
sliceEntry.Length,
sliceEntry.Id));
}
curNode = curNode.Next;
}
Debug.Assert(false, "Available data counter does not corresponds to slice entries.");
throw new InvalidOperationException("Impossible state!");
}
}
/// <inheritdoc/>
public async ValueTask <T> ReadAsync(CancellationToken cancellationToken = default)
{
using (var seqGuard = new SequentialUsageGuard(this))
{
while (true)
{
Task <VoidResult> taskToAwait;
using (var guard = new StateReadGuard <TSyncObject>())
{
if (guard.GetAvailableDataForReading() == 0)
{
_owner.VerifyChannelNotClosed();
seqGuard.OnStateGuardEntered();
Debug.Assert(_owner._dataAvailableCs != null, "_owner._dataAvailableCs != null");
taskToAwait = _owner._dataAvailableCs.Task;
}
else
{
seqGuard.OnStateGuardEntered();
LinkedListNode <SliceEntry> curNode = _owner._sliceEntries.Last;
// Searching for node to read from
while (curNode != null)
{
var sliceEntry = curNode.Value;
if (sliceEntry.Status == SliceEntryStatus.Data)
{
Debug.Assert(sliceEntry.Length != 0, "sliceEntry.Length != 0");
guard.NotifyRead(1);
var item = sliceEntry.Buffer[sliceEntry.Start++];
// Removing empty nodes.
if (--sliceEntry.Length == 0)
{
_owner._sliceEntries.Remove(curNode);
}
return(item);
}
curNode = curNode.Next;
}
Debug.Assert(false, "Available data counter does not corresponds to slice entries.");
throw new InvalidOperationException("Impossible state!");
}
}
await taskToAwait.WithCancellation(cancellationToken);
}
}
}