public SyncManager(IServiceBusFactory serviceBusFactory)
{
var messages = Observable
.Create <ChangeSummary>(async observer => {
var client = await serviceBusFactory.SubscriptionClientForName(ShipHubTopicNames.Changes);
client.PrefetchCount = _BatchSize;
// TODO: convert to batches?
client.OnMessage(message => {
var changes = WebJobInterop.UnpackMessage <ChangeMessage>(message);
observer.OnNext(new ChangeSummary(changes));
}, new OnMessageOptions()
{
AutoComplete = true,
AutoRenewTimeout = TimeSpan.FromMinutes(1), // Has to be less than 5 or subscription will idle and expire
// Should be at least be the number of partitions
MaxConcurrentCalls = 16
});
// When disconnected, stop listening for changes.
return(Disposable.Create(() => client.Close()));
})
.SubscribeOn(TaskPoolScheduler.Default)
.Publish()
.RefCount();
var urgent = messages.Where(x => x.IsUrgent);
var coalesced = messages
.Where(x => !x.IsUrgent)
.Buffer(_WindowTimeout)
.Where(x => x.Count > 0)
.Select(x => ChangeSummary.UnionAll(x));
Changes = Observable
.Merge(urgent, coalesced)
.SubscribeOn(TaskPoolScheduler.Default)
.Publish()
.RefCount();
}
