/// <summary>
/// Subscribe with the relaxed IFlowableSubscriber instance.
/// </summary>
/// <param name="subscriber">The IFlowableSubscriber instance, not null.</param>
public void Subscribe(IFlowableSubscriber <T> subscriber)
{
var parent = new MulticastSubscription(this, subscriber, executor.Worker, bufferSize);
subscriber.OnSubscribe(parent);
if (Add(parent))
{
if (parent.IsCancelled())
{
Remove(parent);
return;
}
}
else
{
var ex = Volatile.Read(ref error);
if (ex == ExceptionHelper.Terminated)
{
subscriber.OnComplete();
}
else
{
subscriber.OnError(ex);
}
}
}
void Remove(MulticastSubscription ms)
{
for (;;)
{
var a = Volatile.Read(ref subscribers);
int n = a.Length;
if (n == 0)
{
break;
}
int j = -1;
for (int i = 0; i < n; i++)
{
if (a[i] == ms)
{
j = i;
break;
}
}
if (j < 0)
{
break;
}
if (n == 1)
{
if (Interlocked.CompareExchange(ref subscribers, Empty, a) == a)
{
break;
}
}
else
{
var b = new MulticastSubscription[n - 1];
Array.Copy(a, 0, b, 0, j);
Array.Copy(a, j + 1, b, j, n - j - 1);
if (Interlocked.CompareExchange(ref subscribers, b, a) == a)
{
break;
}
}
}
}
bool Add(MulticastSubscription ms)
{
for (;;)
{
var a = Volatile.Read(ref subscribers);
if (a == Terminated)
{
return(false);
}
int n = a.Length;
var b = new MulticastSubscription[n + 1];
Array.Copy(a, 0, b, 0, n);
b[n] = ms;
if (Interlocked.CompareExchange(ref subscribers, b, a) == a)
{
return(true);
}
}
}
