internal T GetOrAddScopedInstance <T>(Func <Scoped, T> factory, Type key)
where T : notnull
{
SinglyLinkedListKeyNode <Type, object>?initialValue = _scopedInstances;
SinglyLinkedListKeyNode <Type, object>?current = initialValue;
while (current != null)
{
if (ReferenceEquals(current.Key, key))
{
return((T)current.Value);
}
current = current.Next;
}
//There is a very slight chance that this instance is created more than once under heavy load.
//In that case the duplicate will be discarded.
T obj = factory(this);
SinglyLinkedListKeyNode <Type, object> computedValue = initialValue.Add(key, obj);
if (ReferenceEquals(Interlocked.CompareExchange(ref _scopedInstances, computedValue, initialValue), initialValue))
{
return(obj);
}
else
{
return(HandleScopeThreadCollision(obj, key));
}
}
public void Enumerate_EnumerableNonGenericType()
{
SinglyLinkedListKeyNode <int, int> list = null;
list = list.Add(0, 1);
list = list.Add(1, 2);
list = list.Add(2, 3);
int[] results = ((IEnumerable)list).OfType <int>().ToArray();
Assert.Equal(3, results.Length);
Assert.Equal(3, results[0]);
Assert.Equal(2, results[1]);
Assert.Equal(1, results[2]);
}
public void Enumerate_ConcreteType()
{
SinglyLinkedListKeyNode <int, int> list = null;
list = list.Add(0, 1);
list = list.Add(1, 2);
list = list.Add(2, 3);
int[] results = list.ToArray();
Assert.Equal(3, results.Length);
Assert.Equal(3, results[0]);
Assert.Equal(2, results[1]);
Assert.Equal(1, results[2]);
}
/// <summary>
/// Disposes the scope, calling all dispose actions on the instances that where created in this scope.
/// </summary>
public void Dispose()
{
SinglyLinkedListNode <IDisposable>?disposables = Interlocked.Exchange(ref _disposables, null);
while (disposables != null)
{
disposables.Value.Dispose();
disposables = disposables.Next;
}
SinglyLinkedListKeyNode <ServiceBinding, ActionList <object> >?finalizers = Interlocked.Exchange(ref _finalizers, null);;
while (finalizers != null)
{
finalizers.Value.Invoke();
finalizers = finalizers.Next;
}
}
/// <summary>
/// Disposes the scope, calling all dispose actions on the instances that where created in this scope.
/// </summary>
public void Dispose()
{
SinglyLinkedListNode <IDisposable>?disposables = _disposables;
while (disposables != null)
{
disposables.Value.Dispose();
disposables = disposables.Next !;
}
SinglyLinkedListKeyNode <ServiceBinding, ActionList <object> >?finalizers = _finalizers;
while (finalizers != null)
{
finalizers.Value.Invoke();
finalizers = finalizers.Next;
}
}
private T HandleScopeThreadCollision <T>(T obj, Type key)
{
SinglyLinkedListKeyNode <Type, object>?initialValue, computedValue;
do
{
initialValue = _scopedInstances;
SinglyLinkedListKeyNode <Type, object> current = initialValue;
while (current != null)
{
if (ReferenceEquals(current.Key, key))
{
return((T)current.Value);
}
current = current.Next !;
}
computedValue = initialValue.Add(key, obj);
}while (!ReferenceEquals(Interlocked.CompareExchange(ref _scopedInstances, computedValue, initialValue), initialValue));
return(obj);
}
