public Task Invoke(IDictionary<string, object> env)
{
RequestQueue queue;
if (IsQueueInitialized)
{
queue = _queue;
}
else
{
queue = LazyInitializer.EnsureInitialized(
ref _queue,
ref _queueInitialized,
ref _queueLock,
() =>
{
// Start called once on first request
var newQueue = new RequestQueue(_options);
newQueue.Start();
object value;
CancellationToken onAppDisposing = env.TryGetValue("server.OnAppDisposing", out value) ? (CancellationToken)value : CancellationToken.None;
if (onAppDisposing != CancellationToken.None)
{
// Stop called once on app disposing
// will drain queue by rejecting
onAppDisposing.Register(newQueue.Stop);
}
return newQueue;
});
}
var requestInstance = new RequestInstance(env, _next);
RequestInstance executeInstance = queue.GetInstanceToExecute(requestInstance);
if (executeInstance != null)
{
executeInstance.Execute();
}
return requestInstance.Task;
}
private void CreateRequestQueue()
{
_queue = new RequestQueue(_options);
_queue.Start();
}