public void Census()
{
using (var pub = new XPublisherSocket())
using (var sub = new XSubscriberSocket())
{
var port = pub.BindRandomPort("tcp://127.0.0.1");
sub.Connect("tcp://127.0.0.1:" + port);
sub.SendFrame("Message from subscriber");
// let the subscriber connect to the publisher before sending a message
Thread.Sleep(500);
var txt = pub.ReceiveFrameString();
Assert.AreEqual("Message from subscriber", txt);
sub.SendFrame(new byte[] { });
var msg = pub.ReceiveFrameBytes();
Assert.True(msg.Length == 0);
}
}
public void MultiplePublishers()
{
using (var pub = new XPublisherSocket())
using (var pub2 = new XPublisherSocket())
using (var sub = new XSubscriberSocket())
using (var sub2 = new XSubscriberSocket())
{
var port = pub.BindRandomPort("tcp://127.0.0.1");
var port2 = pub2.BindRandomPort("tcp://127.0.0.1");
// see comments below why verbose option is needed in this test
pub.Options.XPubVerbose = true;
pub2.Options.XPubVerbose = true;
sub.Connect("tcp://127.0.0.1:" + port);
sub.Connect("tcp://127.0.0.1:" + port2);
sub2.Connect("tcp://127.0.0.1:" + port);
sub2.Connect("tcp://127.0.0.1:" + port2);
// should subscribe to both
sub.SendFrame(new byte[] { 1, (byte)'A' });
sub2.SendFrame(new byte[] { 1, (byte)'A' });
Thread.Sleep(500);
var msg = pub.ReceiveFrameString();
Assert.AreEqual(2, msg.Length);
Assert.AreEqual(1, msg[0]);
Assert.AreEqual('A', msg[1]);
var msg2 = pub2.ReceiveFrameBytes();
Assert.AreEqual(2, msg2.Length);
Assert.AreEqual(1, msg2[0]);
Assert.AreEqual('A', msg2[1]);
// Next two blocks (pub(2).Receive) will hang without XPub verbose option:
// sub and sub2 both have sent `.Send(new byte[] { 1, (byte)'A' });` messages
// which are the same, so XPub will discard the second message for .Receive()
// because it is normally used to pass topics upstream.
// (un)subs are done in XPub.cs at line 150-175, quote:
// >> If the subscription is not a duplicate, store it so that it can be
// >> passed to used on next recv call.
// For verbose:
// >> If true, send all subscription messages upstream, not just unique ones
// These options must be set before sub2.Send(new byte[] { 1, (byte)'A' });
// pub.Options.XPubVerbose = true;
// pub2.Options.XPubVerbose = true;
// Note that resending sub2.Send(..) here wont help because XSub won't resent existing subs to XPub - quite sane behavior
// Comment out the verbose options and the next 8 lines and the test will
// still pass, even with non-unique messages from subscribers (see the bottom of the test)
msg = pub.ReceiveFrameString();
Assert.AreEqual(2, msg.Length);
Assert.AreEqual(1, msg[0]);
Assert.AreEqual('A', msg[1]);
msg2 = pub2.ReceiveFrameBytes();
Assert.AreEqual(2, msg2.Length);
Assert.AreEqual(1, msg2[0]);
Assert.AreEqual('A', msg2[1]);
pub.SendMoreFrame("A");
pub.SendFrame("Hello from the first publisher");
bool more;
Assert.AreEqual("A", sub.ReceiveFrameString(out more));
Assert.IsTrue(more);
Assert.AreEqual("Hello from the first publisher", sub.ReceiveFrameString(out more));
Assert.False(more);
// this returns the result of the latest
// connect - address2, not the source of the message
// This is documented here: http://api.zeromq.org/3-2:zmq-getsockopt
//var ep = sub2.Options.LastEndpoint;
//Assert.AreEqual(address, ep);
// same for sub2
Assert.AreEqual("A", sub2.ReceiveFrameString(out more));
Assert.IsTrue(more);
Assert.AreEqual("Hello from the first publisher", sub2.ReceiveFrameString(out more));
Assert.False(more);
pub2.SendMoreFrame("A");
pub2.SendFrame("Hello from the second publisher");
Assert.AreEqual("A", sub.ReceiveFrameString(out more));
Assert.IsTrue(more);
Assert.AreEqual("Hello from the second publisher", sub.ReceiveFrameString(out more));
Assert.False(more);
Assert.AreEqual("tcp://127.0.0.1:" + port2, sub2.Options.LastEndpoint);
// same for sub2
Assert.AreEqual("A", sub2.ReceiveFrameString(out more));
Assert.IsTrue(more);
Assert.AreEqual("Hello from the second publisher", sub2.ReceiveFrameString(out more));
Assert.False(more);
// send both to address and address2
sub.SendFrame("Message from subscriber");
sub2.SendFrame("Message from subscriber 2");
Assert.AreEqual("Message from subscriber", pub.ReceiveFrameString());
Assert.AreEqual("Message from subscriber", pub2.ReceiveFrameString());
// Does not hang even though is the same as above, but the first byte is not 1 or 0.
// Won't hang even when messages are equal
Assert.AreEqual("Message from subscriber 2", pub.ReceiveFrameString());
Assert.AreEqual("Message from subscriber 2", pub2.ReceiveFrameString());
}
}
