public KeyValueWatchSubscription(KeyValue kv, string keyPattern,
IKeyValueWatcher watcher, params KeyValueWatchOption[] watchOptions)
{
string subject = kv.RawKeySubject(keyPattern);
// figure out the result options
bool headersOnly = false;
bool includeDeletes = true;
DeliverPolicy deliverPolicy = DeliverPolicy.LastPerSubject;
foreach (KeyValueWatchOption wo in watchOptions)
{
switch (wo)
{
case KeyValueWatchOption.MetaOnly: headersOnly = true; break;
case KeyValueWatchOption.IgnoreDelete: includeDeletes = false; break;
case KeyValueWatchOption.UpdatesOnly: deliverPolicy = DeliverPolicy.New; break;
case KeyValueWatchOption.IncludeHistory: deliverPolicy = DeliverPolicy.All; break;
}
}
if (deliverPolicy == DeliverPolicy.New)
{
endOfDataSent = new InterlockedBoolean(true);
watcher.EndOfData();
}
else
{
KeyValueEntry kveCheckPending = kv._kvGetLastMessage(keyPattern);
if (kveCheckPending == null)
{
endOfDataSent = new InterlockedBoolean(true);
watcher.EndOfData();
}
else
{
endOfDataSent = new InterlockedBoolean(false);
}
}
PushSubscribeOptions pso = PushSubscribeOptions.Builder()
.WithStream(kv.StreamName)
.WithOrdered(true)
.WithConfiguration(
ConsumerConfiguration.Builder()
.WithAckPolicy(AckPolicy.None)
.WithDeliverPolicy(deliverPolicy)
.WithHeadersOnly(headersOnly)
.WithFilterSubject(subject)
.Build())
.Build();
EventHandler <MsgHandlerEventArgs> handler = (sender, args) =>
{
KeyValueEntry kve = new KeyValueEntry(args.msg);
if (includeDeletes || kve.Operation.Equals(KeyValueOperation.Put))
{
watcher.Watch(kve);
}
if (endOfDataSent.IsFalse() && kve.Delta == 0)
{
endOfDataSent.Set(true);
watcher.EndOfData();
}
};
sub = kv.js.PushSubscribeAsync(subject, handler, false, pso);
if (endOfDataSent.IsFalse())
{
ulong pending = sub.GetConsumerInformation().CalculatedPending;
if (pending == 0)
{
endOfDataSent.Set(true);
watcher.EndOfData();
}
}
}
