private static XChannel AddXChannel(LinkedList <XChannel> list, ChannelIdentification identification, object?targetId, bool exclusiveChannel, IWeakDelegate weakDelegate)
{ // lock (cs) required.
if (exclusiveChannel)
{
if (list.Count > 0)
{ // other channel already exists.
throw new InvalidOperationException();
}
}
else
{
if (list.First?.Value.ExclusiveChannel == true)
{ // Exclusive channel exists.
throw new InvalidOperationException();
}
}
// New XChannel
var channel = new XChannel(identification, targetId, exclusiveChannel, weakDelegate);
// list: Identification to XChannels.
channel.Node = list.AddLast(channel);
return(channel);
}
private static XChannel[] PrepareXChannelArray(LinkedList <XChannel> list, object?targetId)
{ // lock (cs) required. Convert LinkedList to Array, release garbage collected object, and increment reference count.
var array = new XChannel[list.Count];
var arrayCount = 0;
var node = list.First;
LinkedListNode <XChannel>?nextNode;
if (targetId == null)
{
while (node != null)
{
nextNode = node.Next;
if (node.Value.IsAlive)
{// The instance is still alive.
array[arrayCount++] = node.Value;
}
else if (node.Value.ReferenceCount == 0)
{// The instance is garbage collected and reference count is 0.
CloseChannel(node.Value);
}
node = nextNode;
}
}
else
{
while (node != null)
{
nextNode = node.Next;
if (node.Value.IsAlive)
{// The instance is still alive.
if (node.Value.TargetId == targetId)
{
array[arrayCount++] = node.Value;
}
}
else if (node.Value.ReferenceCount == 0)
{// Garbage collected and reference count is 0.
CloseChannel(node.Value);
}
node = nextNode;
}
}
if (array.Length != arrayCount)
{
Array.Resize(ref array, arrayCount);
}
foreach (var x in array)
{
x.ReferenceCount++;
}
return(array);
}
private static void CloseChannel(XChannel channel)
{// lock (cs) required. Reference count must be 0.
// list: Identification to XChannels.
if (channel.Node != null)
{
var list = channel.Node.List;
if (list != null)
{
list.Remove(channel.Node);
}
}
channel.MarkForDeletion();
}
public static void Close(XChannel channel)
{
if (channel.Disposed == true)
{// already closed.
return;
}
while (true)
{
lock (cs)
{
if (channel.ReferenceCount == 0)
{// reference countが0（Send / Receive処理をしていない状態）になったら、Close
CloseChannel(channel);
break;
}
}
#if NETFX_CORE
Task.Delay(50).Wait();
#else
System.Threading.Thread.Sleep(50);
#endif
}
}
