public IJetStreamPullSubscription PullSubscribe(string subject, PullSubscribeOptions options)
{
ValidateNotNull(options, "Pull Subscribe Options");
ValidateSubject(subject, IsSubjectRequired(options));
return((IJetStreamPullSubscription)CreateSubscription(subject, null, null, false, null, options));
}
/// <summary>
/// Builds the PullSubscribeOptions with this configuration
/// </summary>
/// <returns>The PullSubscribeOptions</returns>
public PullSubscribeOptions BuildPullSubscribeOptions()
{
return(PullSubscribeOptions.Builder().WithConfiguration(Build()).Build());
}
Subscription CreateSubscription(string subject, string queueName,
EventHandler <MsgHandlerEventArgs> userHandler, bool autoAck,
PushSubscribeOptions pushSubscribeOptions,
PullSubscribeOptions pullSubscribeOptions)
{
// 1. Prepare for all the validation
bool isPullMode = pullSubscribeOptions != null;
SubscribeOptions so;
string stream;
string qgroup;
ConsumerConfiguration userCC;
if (isPullMode)
{
so = pullSubscribeOptions; // options must have already been checked to be non null
stream = pullSubscribeOptions.Stream;
userCC = so.ConsumerConfiguration;
qgroup = null; // just to make compiler happy both paths set variable
ValidateNotSupplied(userCC.DeliverGroup, JsSubPullCantHaveDeliverGroup);
ValidateNotSupplied(userCC.DeliverSubject, JsSubPullCantHaveDeliverSubject);
}
else
{
so = pushSubscribeOptions ?? DefaultPushOpts;
stream = so.Stream; // might be null, that's ok (see directBind)
userCC = so.ConsumerConfiguration;
if (!userCC.MaxPullWaiting.Equals(ConsumerConfiguration.IntUnset))
{
throw JsSubPushCantHaveMaxPullWaiting.Instance();
}
if (!userCC.MaxBatch.Equals(ConsumerConfiguration.IntUnset))
{
throw JsSubPushCantHaveMaxBatch.Instance();
}
if (!userCC.MaxBytes.Equals(ConsumerConfiguration.IntUnset))
{
throw JsSubPushCantHaveMaxBytes.Instance();
}
// figure out the queue name
qgroup = ValidateMustMatchIfBothSupplied(userCC.DeliverGroup, queueName, JsSubQueueDeliverGroupMismatch);
if (so.Ordered && qgroup != null)
{
throw JsSubOrderedNotAllowOnQueues.Instance();
}
}
// 2A. Flow Control / heartbeat not always valid
if (userCC.FlowControl || userCC.IdleHeartbeat != null && userCC.IdleHeartbeat.Millis > 0)
{
if (isPullMode)
{
throw JsSubFcHbNotValidPull.Instance();
}
if (qgroup != null)
{
throw JsSubFcHbHbNotValidQueue.Instance();
}
}
// 2B. Did they tell me what stream? No? look it up.
if (string.IsNullOrWhiteSpace(stream))
{
stream = LookupStreamBySubject(subject);
if (stream == null)
{
throw JsSubNoMatchingStreamForSubject.Instance();
}
}
ConsumerConfiguration serverCC = null;
string consumerName = userCC.Durable;
string inboxDeliver = userCC.DeliverSubject;
// 3. Does this consumer already exist?
if (consumerName != null)
{
ConsumerInfo serverInfo = LookupConsumerInfo(stream, consumerName);
if (serverInfo != null) // the consumer for that durable already exists
{
serverCC = serverInfo.ConsumerConfiguration;
// check to see if the user sent a different version than the server has
// modifications are not allowed
IList <string> changes = userCC.GetChanges(serverCC);
if (changes.Count > 0)
{
throw JsSubExistingConsumerCannotBeModified.Instance($"[{string.Join(",", changes)}]");
}
if (isPullMode)
{
if (!string.IsNullOrWhiteSpace(serverCC.DeliverSubject))
{
throw JsSubConsumerAlreadyConfiguredAsPush.Instance();
}
}
else if (string.IsNullOrWhiteSpace(serverCC.DeliverSubject))
{
throw JsSubConsumerAlreadyConfiguredAsPull.Instance();
}
if (string.IsNullOrWhiteSpace(serverCC.DeliverGroup))
{
// lookedUp was null/empty, means existing consumer is not a queue consumer
if (qgroup == null)
{
// ok fine, no queue requested and the existing consumer is also not a queue consumer
// we must check if the consumer is in use though
if (serverInfo.PushBound)
{
throw JsSubConsumerAlreadyBound.Instance();
}
}
else // else they requested a queue but this durable was not configured as queue
{
throw JsSubExistingConsumerNotQueue.Instance();
}
}
else if (qgroup == null)
{
throw JsSubExistingConsumerIsQueue.Instance();
}
else if (!serverCC.DeliverGroup.Equals(qgroup))
{
throw JsSubExistingQueueDoesNotMatchRequestedQueue.Instance();
}
// durable already exists, make sure the filter subject matches
if (string.IsNullOrWhiteSpace(subject))
{
subject = userCC.FilterSubject;
}
else if (!IsFilterMatch(subject, serverCC.FilterSubject, stream))
{
throw JsSubSubjectDoesNotMatchFilter.Instance();
}
inboxDeliver = serverCC.DeliverSubject; // use the deliver subject as the inbox. It may be null, that's ok, we'll fix that later
}
else if (so.Bind)
{
throw JsSubConsumerNotFoundRequiredInBind.Instance();
}
}
// 4. If no deliver subject (inbox) provided or found, make an inbox.
if (string.IsNullOrWhiteSpace(inboxDeliver))
{
inboxDeliver = Conn.NewInbox();
}
// 5. If consumer does not exist, create and settle on the config. Name will have to wait
// If the consumer exists, I know what the settled info is
if (serverCC == null)
{
ConsumerConfiguration.ConsumerConfigurationBuilder ccBuilder = ConsumerConfiguration.Builder(userCC);
// Pull mode doesn't maintain a deliver subject. It's actually an error if we send it.
if (!isPullMode)
{
ccBuilder.WithDeliverSubject(inboxDeliver);
}
if (string.IsNullOrWhiteSpace(userCC.FilterSubject))
{
ccBuilder.WithFilterSubject(subject);
}
if (string.IsNullOrWhiteSpace(userCC.DeliverGroup) && !string.IsNullOrWhiteSpace(qgroup))
{
ccBuilder.WithDeliverGroup(qgroup);
}
// createOrUpdateConsumer can fail for security reasons, maybe other reasons?
serverCC = ccBuilder.Build();
consumerName = null;
}
// 6. create the subscription
Subscription sub;
if (isPullMode)
{
MessageManager[] managers = { new PullMessageManager() };
SyncSubscription CreateSubDelegate(Connection lConn, string lSubject, string lQueueNa)
{
return(new JetStreamPullSubscription(lConn, lSubject, this, stream, consumerName, inboxDeliver, managers));
}
sub = ((Connection)Conn).subscribeSync(inboxDeliver, queueName, CreateSubDelegate);
}
else
{
bool syncMode = userHandler == null;
PushMessageManager pushMessageManager =
PushMessageManagerFactoryImpl((Connection)Conn, so, serverCC, qgroup != null, syncMode);
MessageManager[] managers;
if (so.Ordered)
{
managers = new MessageManager[]
{
new SidCheckManager(),
pushMessageManager,
new OrderedMessageManager(this, stream, serverCC, syncMode)
};
}
else
{
managers = new MessageManager[] { pushMessageManager };
}
if (syncMode)
{
SyncSubscription CreateSubDelegate(Connection lConn, string lSubject, string lQueue)
{
return(new JetStreamPushSyncSubscription(lConn, lSubject, lQueue, this, stream, consumerName, inboxDeliver, managers));
}
sub = ((Connection)Conn).subscribeSync(inboxDeliver, queueName, CreateSubDelegate);
}
else
{
EventHandler <MsgHandlerEventArgs> autoAckHandler;
if (autoAck && serverCC.AckPolicy != AckPolicy.None)
{
autoAckHandler = (sender, args) => args.Message.Ack();
}
else
{
autoAckHandler = (sender, args) => {};
}
EventHandler <MsgHandlerEventArgs> handler = (sender, args) =>
{
foreach (MessageManager mm in managers)
{
if (mm.Manage(args.Message))
{
return; // manager handled the message
}
}
userHandler.Invoke(sender, args);
autoAckHandler.Invoke(sender, args);
};
AsyncSubscription CreateAsyncSubDelegate(Connection lConn, string lSubject, string lQueue)
{
return(new JetStreamPushAsyncSubscription(lConn, lSubject, lQueue, this, stream, consumerName, inboxDeliver, managers));
}
sub = ((Connection)Conn).subscribeAsync(inboxDeliver, queueName, handler, CreateAsyncSubDelegate);
}
}
// 7. The consumer might need to be created, do it here
if (consumerName == null)
{
try
{
ConsumerInfo ci = AddOrUpdateConsumerInternal(stream, serverCC);
if (sub is JetStreamAbstractSyncSubscription syncSub)
{
syncSub.Consumer = ci.Name;
}
else if (sub is JetStreamPushAsyncSubscription asyncSub)
{
asyncSub.Consumer = ci.Name;
}
}
catch
{
// create consumer can fail, unsubscribe and then throw the exception to the user
sub.Unsubscribe();
throw;
}
}
return(sub);
}
