public void DeleteLinkWithResource(int threadId, SafeResource resource)
{
lock (_syncRoot)
{
var threadNode = GetThreadNode(threadId);
var resourceNode = GetResourceNode(resource);
threadNode.Links.Remove(resourceNode);
resourceNode.Links.Remove(threadNode);
}
}
public void AddRequestToResource(int threadId, SafeResource resource)
{
lock (_syncRoot)
{
var threadNode = GetThreadNode(threadId);
var resourceNode = GetResourceNode(resource);
threadNode.Links.AddLast(resourceNode);
CheckCycle(resourceNode);
}
}
public void ApplyRequestToResource(int threadId, SafeResource resource)
{
lock (_syncRoot)
{
var threadNode = GetThreadNode(threadId);
var resourceNode = GetResourceNode(resource);
if (!threadNode.Links.Remove(resourceNode))
{
throw new ApplicationException("Resource link not found");
}
resourceNode.Links.AddLast(threadNode);
CheckCycle(threadNode);
}
}
private Node GetResourceNode(SafeResource resource)
{
var resourceNode = _resourceNodes.FirstOrDefault(n => n.Resource == resource);
if (resourceNode == null)
{
resourceNode = new Node
{
Resource = resource,
ThreadId = -1
};
_resourceNodes.Add(resourceNode);
}
return(resourceNode);
}