private async Task <OperationResult <ChannelState> > WriteWithTimeoutAsync(AsynchronousWritingOperation writingOperation, long length, TimeSpan timeout)
{
ThrowIfDisposed();
bool gainedExclusiveAccess = false;
try
{
var status = await AsyncHelper.GetTaskForWaitHandle(_exclusiveAccessSemaphore, timeout);
if (status != OperationStatus.Completed)
{
return(new OperationResult <ChannelState>(status, null));
}
gainedExclusiveAccess = true;
return(await WriteAndSetEventsAsync(writingOperation, length));
}
finally
{
if (gainedExclusiveAccess)
{
_exclusiveAccessSemaphore.Release();
}
}
}
public async Task <OperationResult <ChannelState> > WriteAsync(AsynchronousWritingOperation writingOperation, long length)
{
var header = Header.Read(_headerView);
var allocationResult = AllocateSpaceFromFreeList(length, ref header);
if (allocationResult.Status != OperationStatus.Completed)
{
return(new OperationResult <ChannelState>(allocationResult.Status, new ChannelState(header)));
}
var newNodePosition = allocationResult.Data;
if (newNodePosition < 0)
{
if (header.TotalSpace + _sizeOfNode + length > Capacity)
{
return(new OperationResult <ChannelState>(OperationStatus.OutOfSpace, new ChannelState(header)));
}
newNodePosition = header.TotalSpace;
}
return(await WriteNodeAndCommitAsync(newNodePosition, length, writingOperation, header));
}
private async Task <OperationResult <ChannelState> > WriteAndSetEventsAsync(AsynchronousWritingOperation writingOperation, long length)
{
var result = await((WriterMemoryManager)_memoryManager).WriteAsync(writingOperation, length);
var channelState = result.Data;
if (channelState != null && channelState.MessagesCount > 0)
{
_noMessagesEvent.Reset();
_hasMessagesEvent.Set();
}
return(result);
}
private async Task <OperationResult <ChannelState> > WriteNodeAndCommitAsync(long newNodeOffset, long length, AsynchronousWritingOperation writingOperation, Header header)
{
var status = await writingOperation.WriteAsync(_file, newNodeOffset + _sizeOfNode, length);
if (status != OperationStatus.RequestedLengthIsGreaterThanLogicalAddressSpace && status != OperationStatus.RequestedLengthIsGreaterThanVirtualAddressSpace)
{
if (status == OperationStatus.Cancelled || status == OperationStatus.DelegateFailed)
{
ReturnSpaceToFreeList(newNodeOffset, length, ref header);
}
else
{
var newNode = new Node(-1, length);
Node.Write(_file, newNodeOffset, ref newNode);
if (header.TailNode >= 0)
{
using (var tailView = _file.CreateViewAccessor(header.TailNode, _sizeOfNode))
{
var tail = Node.Read(tailView);
tail.Next = newNodeOffset;
Node.Write(tailView, ref tail);
}
}
header.TailNode = newNodeOffset;
if (header.HeadNode < 0)
{
header.HeadNode = newNodeOffset;
}
var allocated = (newNodeOffset + _sizeOfNode + length) - header.TotalSpace;
if (allocated > 0)
{
header.TotalSpace += allocated;
}
header.ActiveNodes += 1;
}
Header.Write(_headerView, ref header);
}
return(new OperationResult <ChannelState>(status, new ChannelState(header)));
}
