public async ValueTask <bool> RemoveProcessor(HttpIoProcessorBase <THost, TContext> processor, CancellationToken token)
{
if (RemoveFromList(processor))
{
await StopHost(token).ConfigureAwait(false);
return(true);
}
return(false);
}
public async ValueTask AddProcessor(HttpIoProcessorBase <THost, TContext> processor, CancellationToken token)
{
if (AddToList(processor))
{
try
{
await StartHost(token).ConfigureAwait(false);
}
catch
{
RemoveFromList(processor);
throw;
}
}
}
private bool AddToList(HttpIoProcessorBase <THost, TContext> processor)
{
ImmutableList <HttpIoProcessorBase <THost, TContext> > preVal, newVal;
do
{
preVal = Processors;
if (preVal.Contains(processor))
{
return(false);
}
newVal = preVal.Add(processor);
}while (Interlocked.CompareExchange(ref _processors, newVal, preVal) != preVal);
return(preVal.Count == 0);
}
private bool RemoveFromList(HttpIoProcessorBase <THost, TContext> processor)
{
ImmutableList <HttpIoProcessorBase <THost, TContext> > preVal, newVal;
do
{
preVal = Processors;
var index = preVal.IndexOf(processor);
if (index < 0)
{
return(false);
}
newVal = preVal.RemoveAt(index);
}while (Interlocked.CompareExchange(ref _processors, newVal, preVal) != preVal);
return(newVal.Count == 0);
}