static async Task P_DoSingleMessagePostingAsync(LocalPostingToken token, ILocalSubscription subscription, CancellationToken ct)
{
token.EnsureNotNull(nameof(token));
subscription.EnsureNotNull(nameof(subscription));
//
if (subscription.IsActive)
{
ILocalSubscriber subscriber;
try {
subscriber = subscription.Subscriber;
}
catch (ObjectDisposedException) {
if (subscription.IsActive)
{
throw;
}
else
{
return;
}
}
//
using (var context = ContextUtilities.Create(ct: ct))
await subscriber.ProcessMessagePostAsync(subscription : subscription, message : token.Message, ctx : context).ConfigureAwait(false);
//
token.NotifySubscriptionPosted();
}
}
internal LocalPostingQueueEntry(LocalPostingToken postingToken, IEnumerable <ILocalSubscription> postingSubscriptions)
{
postingToken.EnsureNotNull(nameof(postingToken));
var locPostingSubscriptions = postingSubscriptions.EnsureNotNull(nameof(postingSubscriptions)).EnsureNoNullElements().Value.ToList();
//
_postingToken = postingToken;
_postingSubscriptions = locPostingSubscriptions;
_postingSubscriptionsSpinLock = new PrimitiveSpinLock();
}
public bool TryGetNextPostingSubscription(out LocalPostingToken postingToken, out ILocalSubscription postingSubscription)
{
if (TryReadDA(ref _postingSubscriptionsSpinLock, considerDisposeRequest: true, result: out var subscriptionsSpinLock) &&
TryReadDA(ref _postingSubscriptions, considerDisposeRequest: true, result: out var subscriptions) &&
TryReadDA(ref _postingToken, considerDisposeRequest: true, result: out var locPostingToken))
{
//
var locPostingSubscription =
subscriptionsSpinLock
.Invoke(
() => {
if (subscriptions.Count < 1)
{
return(null);
}
else
{
return(subscriptions.RemoveItemAt(index: 0));
}
});
postingSubscription = locPostingSubscription;
postingToken = locPostingSubscription == null ? null : locPostingToken;
return(locPostingSubscription != null);
}