public SequentialNode <TItem> Take()
{
SequentialNode <TItem> node = null;
SequentialNode <TItem> minValueItem = null;
lock (syncRoot)
{
if (nodeMap.Count == 0)
{
Monitor.Wait(syncRoot);
}
}
while (true)
{
lock (syncRoot)
{
minValueItem = node = redBlack.GetMinValue() as SequentialNode <TItem>;
}
if (minValueItem.CheckIfTakeOk())
{
do
{
SequentialNode <TItem> deleteNode;
TryRemove(minValueItem.Key, out deleteNode);
minValueItem = minValueItem.Next;
}while (minValueItem != null);
break;
}
}
return(node);
}
public bool Offer(object key, SequentialNode <TItem> node)
{
lock (syncRoot)
{
var offerOk = false;
if (node == null)
{
return(false);
}
if (nodeMap.Count == capacity)
{
return(false);
}
if (!nodeMap.ContainsKey(key))
{
object val = null;
nodeMap[key] = node;
if (redBlack.TryGetValue(node.SortedKey, out val))
{
var alreadyExists = val as SequentialNode <TItem>;
while (alreadyExists.Next != null)
{
alreadyExists = alreadyExists.Next;
}
alreadyExists.Next = node;
node.Previous = alreadyExists;
}
else
{
if (redBlack.Size() > 0)
{
var minVal = redBlack.GetMinValue() as SequentialNode <TItem>;
if (minVal.SortedKey.CompareTo(node.SortedKey) > 0)
{
minVal.NotifySequenceChanged();
}
}
redBlack.Add(node.SortedKey, node);
}
Monitor.Pulse(syncRoot);
offerOk = true;
}
return(offerOk);
}
}
public bool TryRemove(object key, out SequentialNode <TItem> node)
{
lock (syncRoot)
{
node = null;
var removeOk = false;
if (nodeMap.TryGetValue(key, out node))
{
if (node.Next == null && node.Previous == null)
{
var minVal = redBlack.GetMinValue() as SequentialNode <TItem>;
if (minVal.SortedKey == node.SortedKey)
{
node.NotifySequenceChanged();
}
redBlack.Remove(node.SortedKey);
}
else
{
if (node.Next == null)
{
node.Previous.Next = null;
}
else if (node.Previous == null)
{
node.Next.Previous = null;
}
else
{
node.Previous.Next = node.Next;
node.Next.Previous = node.Previous;
}
}
nodeMap.Remove(key);
removeOk = true;
}
return(removeOk);
}
}
public bool Offer(SequentialNode <TItem> node)
{
return(Offer(Guid.NewGuid().ToString(), node));
}
public bool TryFind(object key, out SequentialNode <TItem> node)
{
return(nodeMap.TryGetValue(key, out node));
}
