public Task UnloadAsync()
{
IMultiLifetimeInstance instance = null;
lock (_lock)
{
if (_instance != null)
{
instance = _instance;
_instance = null;
_loadedSource = new TaskCompletionSource <object>();
}
}
if (instance != null)
{
return(instance.DisposeAsync());
}
return(Task.CompletedTask);
}
private async Task LoadCoreAsync()
{
TaskCompletionSource <object> loadedSource = null;
IMultiLifetimeInstance instance;
lock (_lock)
{
if (_instance == null)
{
_instance = CreateInstance();
loadedSource = _loadedSource;
}
instance = _instance;
}
// While all callers should wait on InitializeAsync,
// only one should complete the completion source
await instance.InitializeAsync();
loadedSource?.SetResult(null);
}