protected async void DoHeartBeat(string id)
{
if (HeartBeat <= TimeSpan.Zero)
{
return;
}
var timer = new TaskCompletionSource <bool>();
Timers.AddOrUpdate(id, timer, (_, oldtimer) => {
oldtimer.TrySetResult(false);
return(timer);
});
using (CancellationTokenSource source = new CancellationTokenSource()) {
#if NET40
var delay = TaskEx.Delay(HeartBeat, source.Token);
var task = await TaskEx.WhenAny(timer.Task, delay).ConfigureAwait(false);
#else
var delay = Task.Delay(HeartBeat, source.Token);
var task = await Task.WhenAny(timer.Task, delay).ConfigureAwait(false);
#endif
source.Cancel();
if (task == delay)
{
timer.TrySetResult(true);
}
}
if (await timer.Task.ConfigureAwait(false) && Messages.TryGetValue(id, out var topics))
{
foreach (var topic in topics.Keys)
{
Offline(topics, id, topic, new ServiceContext(Service));
}
}
}