private void _testPushDurableSubSync(string durable, string deliverSubject, IConnection nc,
PushSyncSubSupplier supplier)
{
IJetStreamPushSyncSubscription sub = supplier.Invoke();
AssertSubscription(sub, STREAM, durable, deliverSubject, false);
// read what is available
IList <Msg> messages = ReadMessagesAck(sub);
int total = messages.Count;
ValidateRedAndTotal(5, messages.Count, 5, total);
// read again, nothing should be there
messages = ReadMessagesAck(sub);
total += messages.Count;
ValidateRedAndTotal(0, messages.Count, 5, total);
sub.Unsubscribe();
nc.Flush(1000); // flush outgoing communication with/to the server
// re-subscribe
sub = supplier.Invoke();
nc.Flush(1000); // flush outgoing communication with/to the server
// read again, nothing should be there
messages = ReadMessagesAck(sub);
total += messages.Count;
ValidateRedAndTotal(0, messages.Count, 5, total);
sub.Unsubscribe();
nc.Flush(1000); // flush outgoing communication with/to the server
}
public void TestJetStreamPushEphemeral(string deliverSubject)
{
Context.RunInJsServer(c =>
{
// create the stream.
CreateDefaultTestStream(c);
// Create our JetStream context.
IJetStream js = c.CreateJetStreamContext();
// publish some messages
JsPublish(js, SUBJECT, 1, 5);
// Build our subscription options.
PushSubscribeOptions options = PushSubscribeOptions.Builder()
.WithDeliverSubject(deliverSubject)
.Build();
// Subscription 1
IJetStreamPushSyncSubscription sub = js.PushSubscribeSync(SUBJECT, options);
AssertSubscription(sub, STREAM, null, deliverSubject, false);
c.Flush(DefaultTimeout); // flush outgoing communication with/to the server
IList <Msg> messages1 = ReadMessagesAck(sub);
int total = messages1.Count;
ValidateRedAndTotal(5, messages1.Count, 5, total);
// read again, nothing should be there
IList <Msg> messages0 = ReadMessagesAck(sub);
total += messages0.Count;
ValidateRedAndTotal(0, messages0.Count, 5, total);
sub.Unsubscribe();
// Subscription 2
sub = js.PushSubscribeSync(SUBJECT, options);
c.Flush(DefaultTimeout); // flush outgoing communication with/to the server
// read what is available, same messages
IList <Msg> messages2 = ReadMessagesAck(sub);
total = messages2.Count;
ValidateRedAndTotal(5, messages2.Count, 5, total);
// read again, nothing should be there
messages0 = ReadMessagesAck(sub);
total += messages0.Count;
ValidateRedAndTotal(0, messages0.Count, 5, total);
AssertSameMessages(messages1, messages2);
});
}
public void TestOrderedConsumerSync()
{
Console.SetOut(new ConsoleWriter(output));
Context.RunInJsServer(c =>
{
// Setup
IJetStream js = c.CreateJetStreamContext();
string subject = Subject(111);
CreateMemoryStream(c, Stream(111), subject);
// Get this in place before any subscriptions are made
JetStream.PushMessageManagerFactoryImpl =
(conn, so, cc, queueMode, syncMode) =>
new OrderedTestDropSimulator(conn, so, cc, queueMode, syncMode);
// The options will be used in various ways
PushSubscribeOptions pso = PushSubscribeOptions.Builder().WithOrdered(true).Build();
// Test queue exception
NATSJetStreamClientException e = Assert.Throws <NATSJetStreamClientException>(() => js.PushSubscribeSync(subject, QUEUE, pso));
Assert.Contains(JsSubOrderedNotAllowOnQueues.Id, e.Message);
// Setup sync subscription
IJetStreamPushSyncSubscription sub = js.PushSubscribeSync(subject, pso);
Thread.Sleep(1000);
// Published messages will be intercepted by the OrderedTestDropSimulator
JsPublish(js, subject, 101, 6);
ulong streamSeq = 1;
while (streamSeq < 7)
{
Msg m = sub.NextMessage(1000);
if (m != null)
{
Assert.Equal(streamSeq, m.MetaData.StreamSequence);
Assert.Equal(ExpectedConSeqNums[streamSeq - 1], m.MetaData.ConsumerSequence);
++streamSeq;
}
}
sub.Unsubscribe();
EnsureNotBound(sub);
});
}
private void VisitSubject(string subject, DeliverPolicy deliverPolicy, bool headersOnly, bool ordered, Action <Msg> action)
{
PushSubscribeOptions pso = PushSubscribeOptions.Builder()
.WithOrdered(ordered)
.WithConfiguration(
ConsumerConfiguration.Builder()
.WithAckPolicy(AckPolicy.None)
.WithDeliverPolicy(deliverPolicy)
.WithHeadersOnly(headersOnly)
.Build())
.Build();
IJetStreamPushSyncSubscription sub = js.PushSubscribeSync(subject, pso);
try
{
bool lastTimedOut = false;
ulong pending = sub.GetConsumerInformation().CalculatedPending;
while (pending > 0) // no need to loop if nothing pending
{
try
{
Msg m = sub.NextMessage(js.Timeout);
action.Invoke(m);
if (--pending == 0)
{
return;
}
lastTimedOut = false;
}
catch (NATSTimeoutException)
{
if (lastTimedOut)
{
return; // two timeouts in a row is enough
}
lastTimedOut = true;
}
}
}
finally
{
sub.Unsubscribe();
}
}
public void TestMessageWithHeadersOnly()
{
Context.RunInJsServer(c =>
{
// create the stream.
CreateDefaultTestStream(c);
// Create our JetStream context.
IJetStream js = c.CreateJetStreamContext();
MsgHeader h = new MsgHeader();
h["foo"] = "bar";
js.Publish(new Msg(SUBJECT, h, DataBytes(1)));
// Build our subscription options.
PushSubscribeOptions options = ConsumerConfiguration.Builder()
.WithHeadersOnly(true).BuildPushSubscribeOptions();
IJetStreamPushSyncSubscription sub = js.PushSubscribeSync(SUBJECT, options);
c.Flush(DefaultTimeout); // flush outgoing communication with/to the server
Msg m = sub.NextMessage(1000);
Assert.Empty(m.Data);
Assert.True(m.HasHeaders);
Assert.Equal("bar", m.Header["foo"]);
Assert.Equal("6", m.Header[JetStreamConstants.MsgSizeHeader]);
sub.Unsubscribe();
// without headers only
sub = js.PushSubscribeSync(SUBJECT);
c.Flush(DefaultTimeout); // flush outgoing communication with/to the server
m = sub.NextMessage(1000);
Assert.Equal(6, m.Data.Length);
Assert.True(m.HasHeaders);
Assert.Equal("bar", m.Header["foo"]);
Assert.Null(m.Header[JetStreamConstants.MsgSizeHeader]);
});
}
public static void Main(string[] args)
{
ArgumentHelper helper = new ArgumentHelperBuilder("Push Subscribe Basic Sync", args, Usage)
.DefaultStream("example-stream")
.DefaultSubject("example-subject")
.DefaultCount(0, true) // true indicated 0 means unlimited
// .DefaultDurable("push-sub-basic-sync-durable")
.Build();
int count = helper.Count < 1 ? int.MaxValue : helper.Count;
try
{
using (IConnection c = new ConnectionFactory().CreateConnection(helper.MakeOptions()))
{
// The stream (and data) must exist
JsUtils.ExitIfStreamNotExists(c, helper.Stream);
// Create our JetStream context.
IJetStream js = c.CreateJetStreamContext();
// Build our subscription options.
// * A push subscription means the server will "push" us messages.
// * Durable means the server will remember where we are if we use that name.
// * Durable can by null or empty, the builder treats them the same.
// * The stream name is not technically required. If it is not provided, the
// code building the subscription will look it up by making a request to the server.
// If you know the stream name, you might as well supply it and save a trip to the server.
PushSubscribeOptions so = PushSubscribeOptions.Builder()
.WithStream(helper.Stream)
.WithDurable(helper.Durable) // it's okay if this is null, the builder handles it
.Build();
// Subscribe synchronously, then just wait for messages.
IJetStreamPushSyncSubscription sub = js.PushSubscribeSync(helper.Subject, so);
c.Flush(5000);
int red = 0;
while (count > 0)
{
try
{
Msg msg = sub.NextMessage(1000);
Console.WriteLine("\nMessage Received:");
if (msg.HasHeaders)
{
Console.WriteLine(" Headers:");
foreach (string key in msg.Header.Keys)
{
foreach (string value in msg.Header.GetValues(key))
{
Console.WriteLine($" {key}: {value}");
}
}
}
Console.WriteLine(" Subject: {0}\n Data: {1}\n", msg.Subject, Encoding.UTF8.GetString(msg.Data));
Console.WriteLine(" " + msg.MetaData);
// Because this is a synchronous subscriber, there's no auto-ack.
// The default Consumer Configuration AckPolicy is Explicit
// so we need to ack the message or it'll be redelivered.
msg.Ack();
++red;
--count;
}
catch (NATSTimeoutException) // timeout means there are no messages available
{
count = 0; // ran out of messages
}
}
Console.WriteLine("\n" + red + " message(s) were received.\n");
sub.Unsubscribe();
c.Flush(5000);
}
}
catch (Exception ex)
{
helper.ReportException(ex);
}
}
public static void Main(string[] args)
{
ArgumentHelper helper = new ArgumentHelperBuilder("NATS JetStream Push Subscribe Bind Durable", args, Usage)
.DefaultStream("example-stream")
.DefaultSubject("example-subject")
.DefaultDurable("bind-durable")
.DefaultDeliverSubject("bind-deliver")
.DefaultCount(0, true) // true indicated 0 means unlimited
.Build();
int count = helper.Count < 1 ? int.MaxValue : helper.Count;
try
{
using (IConnection c = new ConnectionFactory().CreateConnection(helper.MakeOptions()))
{
// The stream (and data) must exist
JsUtils.ExitIfStreamNotExists(c, helper.Stream);
// The durable consumer must already exist. Usually it would be made in configuration
// or via the NATS CLI but we are making it here.
// Important: The consumer must have a deliver subject when made this way or it will be
// understood to be a pull consumer by the server.
// NOTE: If you ran this example already, the consumer will have been created
// This is not a problem if it is exactly the same. Most ConsumerConfiguration
// properties are not modifiable once created.
ConsumerConfiguration cc = ConsumerConfiguration.Builder()
.WithDurable(helper.Durable)
.WithDeliverSubject(helper.DeliverSubject)
.Build();
c.CreateJetStreamManagementContext().AddOrUpdateConsumer(helper.Stream, cc);
// Create our JetStream context.
IJetStream js = c.CreateJetStreamContext();
// bind subscribe to the stream - either variety will work
// V1. Version designed specifically for this purpose.
PushSubscribeOptions so = PushSubscribeOptions.BindTo(helper.Stream, helper.Durable);
// V2. optional long form
// PushSubscribeOptions so = PushSubscribeOptions.Builder()
// .WithBind(true)
// .WithStream(helper.Stream)
// .WithDurable(helper.Durable)
// .Build();
// Subscribe synchronously, then just wait for messages.
IJetStreamPushSyncSubscription sub = js.PushSubscribeSync(helper.Subject, so);
c.Flush(5000);
int red = 0;
while (count > 0)
{
try
{
Msg msg = sub.NextMessage(1000);
Console.WriteLine("\nMessage Received:");
if (msg.HasHeaders)
{
Console.WriteLine(" Headers:");
foreach (string key in msg.Header.Keys)
{
foreach (string value in msg.Header.GetValues(key))
{
Console.WriteLine($" {key}: {value}");
}
}
}
Console.WriteLine(" Subject: {0}\n Data: {1}\n", msg.Subject, Encoding.UTF8.GetString(msg.Data));
Console.WriteLine(" " + msg.MetaData);
// Because this is a synchronous subscriber, there's no auto-ack.
// The default Consumer Configuration AckPolicy is Explicit
// so we need to ack the message or it'll be redelivered.
msg.Ack();
++red;
--count;
}
catch (NATSTimeoutException) // timeout means there are no messages available
{
count = 0; // ran out of messages
}
}
Console.WriteLine("\n" + red + " message(s) were received.\n");
sub.Unsubscribe();
c.Flush(5000);
}
}
catch (Exception ex)
{
helper.ReportException(ex);
}
}
