/// <summary>
/// Gets the number of resources owned by the specified
/// <see cref="Task"/> (if any).
/// </summary>
/// <param name="task">
/// The <see cref="Task"/> whose resource ownership count will be
/// computed.
/// </param>
/// <returns>
/// The number of resource from the pool owned by
/// <paramref name="task"/>. If <paramref name="task"/> does not
/// own any resources from the pool, the returned value will be zero
/// (0).
/// </returns>
public int OwnershipCount(Task task)
{
int count;
if (IsOwner(task))
{
ResourceEntry entry = _owners[task];
count = entry.Count;
System.Diagnostics.Debug.Assert(count > 0);
}
else
{
count = 0;
}
return(count);
}
public virtual Task Release(Task owner)
{
if (owner == null)
{
throw new ArgumentNullException("owner", "cannot be null");
}
if (!IsOwner(owner))
{
throw new InvalidOperationException(
"Task is not a resource owner.");
}
ResourceEntry entry = _owners[owner];
object item = SelectItemToRelease(owner, entry.Items);
return(new ReleaseResource(owner.Simulation, this, item));
}
/// <summary>
/// Removes the specified <see cref="Task"/> as a resource item owner.
/// </summary>
/// <param name="owner">
/// The <see cref="Task"/> that owns <paramref name="item"/>.
/// </param>
/// <param name="item">
/// A reference to the resource item previously obtained via a call to
/// <see cref="AllocateResource"/> (for tracked resources); or
/// <see langword="null"/> (for anonymous resources).
/// </param>
private void ClearOwner(Task owner, object item)
{
if (owner != null && _owners != null)
{
ResourceEntry entry = _owners[owner];
if (item == null)
{
entry.Remove();
}
else
{
entry.Remove(item);
}
if (entry.Count < 1)
{
_owners.Remove(owner);
}
}
}
/// <summary>
/// Record the given <see cref="Task"/> as a resource item owner.
/// </summary>
/// <param name="task">
/// The <see cref="Task"/> that owns <paramref name="item"/>.
/// </param>
/// <param name="item">
/// The reference to a resource item for tracked resources; or
/// <see langword="null"/> for anonymous resources.
/// </param>
internal void SetOwner(Task task, object item)
{
if (task != null)
{
ResourceEntry entry;
if (_owners == null)
{
_owners = new Dictionary <Task, ResourceEntry>();
}
if (!IsOwner(task))
{
if (item == null)
{
entry = new ResourceEntry();
}
else
{
entry = new ResourceEntry(item);
}
_owners.Add(task, entry);
}
else
{
entry = _owners[task];
if (item == null)
{
entry.Add();
}
else
{
entry.Add(item);
}
}
}
}
