public override V Complete()
{
if (!done)
{
queue.ReleaseRead(0);
return(eofResult);
}
else
{
throw new InvalidOperationException("Get EOF: Complete or Cancel can be called only once");
}
}
public override V Complete()
{
if (!done)
{
queue.ReleaseRead(1);
return(convertResult(value));
}
else
{
throw new InvalidOperationException("Get: Complete or Cancel can be called only once");
}
}
public static async Task <Option <T> > Dequeue <T>(this IQueueSource <T> queue, CancellationToken ctoken)
{
AcquireReadResult result = await queue.AcquireReadAsync(1, ctoken);
return(result.Visit <Option <T> >
(
new Func <AcquireReadSucceeded, Option <T> >
(
succeeded =>
{
if (succeeded.ItemCount == 0)
{
return new None <T>();
}
else
{
System.Diagnostics.Debug.Assert(succeeded.ItemCount == 1);
bool wasCancelled = false;
if (ctoken.IsCancellationRequested)
{
wasCancelled = true;
queue.ReleaseRead(0);
}
else
{
queue.ReleaseRead(1);
}
if (wasCancelled)
{
throw new OperationCanceledException(ctoken);
}
return new Some <T>(((AcquireReadSucceeded <T>)succeeded).Items[0]);
}
}
),
new Func <AcquireReadCancelled, Option <T> >
(
cancelled => { throw new OperationCanceledException(ctoken); }
),
new Func <AcquireReadFaulted, Option <T> >
(
faulted => { throw faulted.Exception; }
)
));
}
public void ReleaseRead(int consumedItems)
{
parent.ReleaseRead(consumedItems);
}