public static void Main(string[] args)
{
ArgumentHelper helper = new ArgumentHelperBuilder("Pull Subscription using primitive Expires In", args, Usage)
.DefaultStream("expires-in-stream")
.DefaultSubject("expires-in-subject")
.DefaultDurable("expires-in-durable")
.DefaultCount(15)
.Build();
try
{
using (IConnection c = new ConnectionFactory().CreateConnection(helper.MakeOptions()))
{
// Create a JetStreamManagement context.
IJetStreamManagement jsm = c.CreateJetStreamManagementContext();
// Use the utility to create a stream stored in memory.
JsUtils.CreateStreamExitWhenExists(jsm, helper.Stream, helper.Subject);
// Create our JetStream context.
IJetStream js = c.CreateJetStreamContext();
// Start publishing the messages, don't wait for them to finish, simulating an outside producer.
JsUtils.PublishInBackground(js, helper.Subject, "expires-in-message", helper.Count);
// Build our subscription options. Durable is REQUIRED for pull based subscriptions
PullSubscribeOptions pullOptions = PullSubscribeOptions.Builder()
.WithDurable(helper.Durable) // required
.Build();
// subscribe
IJetStreamPullSubscription sub = js.PullSubscribe(helper.Subject, pullOptions);
c.Flush(1000);
bool keepGoing = true;
int red = 0;
while (keepGoing && red < helper.Count)
{
sub.PullExpiresIn(10, 1000);
int round = 0;
while (keepGoing && round < 10)
{
try
{
Msg m = sub.NextMessage(1000); // first message
Console.WriteLine($"{++red}. Message: {m}");
m.Ack();
round++;
}
catch (NATSTimeoutException) // timeout means there are no messages available
{
keepGoing = false;
}
}
}
// delete the stream since we are done with it.
jsm.DeleteStream(helper.Stream);
}
}
catch (Exception ex)
{
helper.ReportException(ex);
}
}
public static void Main(string[] args)
{
ArgumentHelper helper = new ArgumentHelperBuilder("Pull Subscription using primitive Expires In, Use Cases", args, Usage)
.DefaultStream("expires-in-uc-stream")
.DefaultSubject("expires-in-uc-subject")
.DefaultDurable("expires-in-uc-durable")
.Build();
try
{
using (IConnection c = new ConnectionFactory().CreateConnection(helper.MakeOptions()))
{
// Create a JetStreamManagement context.
IJetStreamManagement jsm = c.CreateJetStreamManagementContext();
// Use the utility to create a stream stored in memory.
JsUtils.CreateStreamExitWhenExists(jsm, helper.Stream, helper.Subject);
// Create our JetStream context.
IJetStream js = c.CreateJetStreamContext();
// Build our subscription options. Durable is REQUIRED for pull based subscriptions
PullSubscribeOptions pullOptions = PullSubscribeOptions.Builder()
.WithDurable(helper.Durable) // required
.Build();
// 0.1 Initialize. subscription
// 0.2 Flush outgoing communication with/to the server, useful when app is both JsUtils.Publishing and subscribing.
// 0.3 Start the pull, you don't have to call this again because AckMode.NEXT
// - When we ack a batch message the server starts preparing or adding to the next batch.
Console.WriteLine("\n----------\n0. Initialize the subscription and pull.");
IJetStreamPullSubscription sub = js.PullSubscribe(helper.Subject, pullOptions);
c.Flush(1000);
// 1. Publish some that is less than the batch size.
Console.WriteLine("\n----------\n1. Publish some amount of messages, but not entire batch size.");
JsUtils.Publish(js, helper.Subject, "A", 6);
sub.PullExpiresIn(10, 1200);
IList <Msg> messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 6 total messages, we received: " + messages.Count);
// 2. Publish some more covering our pull size...
Console.WriteLine("----------\n2. Publish more than the batch size.");
sub.PullExpiresIn(10, 1200);
JsUtils.Publish(js, helper.Subject, "B", 14);
messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 10 total messages, we received: " + messages.Count);
// 3. There are still 4 messages from B, but the batch was finished
// - won't get any messages until a pull is issued.
Console.WriteLine("----------\n3. Read without issuing a pull.");
messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 0 total messages, we received: " + messages.Count);
// 4. re-issue the pull to get the last 4
Console.WriteLine("----------\n4. Issue the pull to get the last 4.");
sub.PullExpiresIn(10, 1200);
messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 4 total messages, we received: " + messages.Count);
// 5. publish a lot of messages
Console.WriteLine("----------\n5. Publish a lot of messages. The last pull was under the batch size.");
Console.WriteLine(" Issue another pull with batch size less than number of messages.");
JsUtils.Publish(js, helper.Subject, "C", 25);
sub.PullExpiresIn(10, 1200);
messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 10 total messages, we received: " + messages.Count);
// 6. there are still more messages
Console.WriteLine("----------\n6. Still more messages. Issue another pull with batch size less than number of messages.");
sub.PullExpiresIn(10, 1200);
messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 10 total messages, we received: " + messages.Count);
// 7. there are still more messages
Console.WriteLine("----------\n7. Still more messages. Issue another pull with batch size more than number of messages.");
sub.PullExpiresIn(10, 1200);
messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 5 total messages, we received: " + messages.Count);
// 8. we got them all
Console.WriteLine("----------\n8. No messages left.");
sub.PullExpiresIn(10, 1200);
messages = JsUtils.ReadMessagesAck(sub, timeout: 2000);
Console.WriteLine("We should have received 0 total messages, we received: " + messages.Count);
Console.WriteLine("----------\n");
// delete the stream since we are done with it.
jsm.DeleteStream(helper.Stream);
}
}
catch (Exception ex)
{
helper.ReportException(ex);
}
}
public void TestPullExpires()
{
Context.RunInJsServer(c =>
{
// create the stream.
CreateDefaultTestStream(c);
// Create our JetStream context.
IJetStream js = c.CreateJetStreamContext();
// Build our subscription options. Durable is REQUIRED for pull based subscriptions
PullSubscribeOptions options = PullSubscribeOptions.Builder().WithDurable(DURABLE).Build();
// Subscribe synchronously.
IJetStreamPullSubscription sub = js.PullSubscribe(SUBJECT, options);
AssertSubscription(sub, STREAM, DURABLE, null, true);
c.Flush(DefaultTimeout); // flush outgoing communication with/to the server
int expires = 250; // millis
// publish 10 messages
JsPublish(js, SUBJECT, "A", 5);
sub.PullExpiresIn(10, expires);
IList <Msg> messages = ReadMessagesAck(sub);
Assert.Equal(5, messages.Count);
AssertAllJetStream(messages);
Thread.Sleep(expires); // make sure the pull actually expires
JsPublish(js, SUBJECT, "B", 10);
sub.PullExpiresIn(10, expires);
messages = ReadMessagesAck(sub);
Assert.Equal(10, messages.Count);
Thread.Sleep(expires); // make sure the pull actually expires
JsPublish(js, SUBJECT, "C", 5);
sub.PullExpiresIn(10, expires);
messages = ReadMessagesAck(sub);
Assert.Equal(5, messages.Count);
AssertAllJetStream(messages);
Thread.Sleep(expires); // make sure the pull actually expires
JsPublish(js, SUBJECT, "D", 10);
sub.Pull(10);
messages = ReadMessagesAck(sub);
Assert.Equal(10, messages.Count);
JsPublish(js, SUBJECT, "E", 5);
sub.PullExpiresIn(10, expires); // using millis version here
messages = ReadMessagesAck(sub);
Assert.Equal(5, messages.Count);
AssertAllJetStream(messages);
Thread.Sleep(expires); // make sure the pull actually expires
JsPublish(js, SUBJECT, "F", 10);
sub.PullNoWait(10);
messages = ReadMessagesAck(sub);
Assert.Equal(10, messages.Count);
JsPublish(js, SUBJECT, "G", 5);
sub.PullExpiresIn(10, expires); // using millis version here
messages = ReadMessagesAck(sub);
Assert.Equal(5, messages.Count);
AssertAllJetStream(messages);
JsPublish(js, SUBJECT, "H", 10);
messages = sub.Fetch(10, expires);
Assert.Equal(10, messages.Count);
AssertAllJetStream(messages);
JsPublish(js, SUBJECT, "I", 5);
sub.PullExpiresIn(10, expires);
messages = ReadMessagesAck(sub);
Assert.Equal(5, messages.Count);
AssertAllJetStream(messages);
Thread.Sleep(expires); // make sure the pull actually expires
});
}
