[zeromq-dev] XPub welcome message and manual subscriptions

[Doron Somech]

You welcome.

One note I forgot to mention, when connection get  dropped and subscriber
reconnect again another welcome message will be sent.

This can be ignored or even used for monitoring.
On Nov 26, 2014 5:44 PM, "Arnaud Kapp" <kapp.arno at gmail.com> wrote:

> Upon closer reading, it looks like you made the topic of the welcome
> message customizable.
>
> You can ignore my previous email.
>
> Thanks for the new features.
>
> On Wed, Nov 26, 2014 at 4:39 PM, Arnaud Kapp <kapp.arno at gmail.com> wrote:
> > Hello,
> >
> > This looks like a nice addition. I have one (little) problem with the
> > "welcome message" feature. If I read correctly, the topic for
> > receiving welcome message is "W". I think this is too short and too
> > general.
> >
> >  Maybe we could use some "internal-looking" name, something like
> > "__zmq_xpub_welcome" to make sure subscribing to welcome messages wont
> > enable other unwanted subscriptions.
> > This is because, correct me if i'm wrong, subscribing to "W" will
> > enable subscriptions for "Woohoo" or stuff like this).
> >
> > Thoughts?
> >
> > On Wed, Nov 26, 2014 at 2:30 PM, Doron Somech <somdoron at gmail.com>
> wrote:
> >> Hi All,
> >>
> >> Just want to let you know and have a discussion on two features (two
> >> solutions to problems) that I have just added to zeromq:
> >>
> >> Manual Subscriptions:
> >> Publisher can be configured to manual mode, with manual mode
> subscriptions
> >> send from the client are not added automatically (nor unsubscriptions)
> and
> >> user must call set socket option with ZMQ_SUBSCRIBE on the publisher
> side to
> >> confirm them.
> >>
> >> The idea is that now subscriptions can be confirmed according to
> >> credentials, another use is to actually use a token for the
> subscription and
> >> the publisher will translate the token to one or more topics. For the
> second
> >> use the subscriber side must be of type xsub to avoid filtering
> messages on
> >> the client side.
> >>
> >> You can take a look at the test for usage:
> >> https://github.com/zeromq/libzmq/blob/master/tests/test_xpub_manual.cpp
> .
> >>
> >> Welcome message:
> >> Publisher can be configured to send welcome message when subscriber is
> >> attached.
> >>
> >> This solves the problem of not knowing if the connect action succeed,
> after
> >> connecting we wait for X seconds for a welcome message, if not arrived
> we
> >> know the publisher is down.
> >>
> >> I know this can also be solved with heartbeat but then you have to wait
> up
> >> to the heartbeat interval (and probably double the interval to make
> sure).
> >>
> >> Another nice use it to find the closest publisher, if I have multiple
> >> publishers around the world client can try to connect to all, the first
> one
> >> to answer with welcome is probably the closest one (alternative to
> geodns).
> >>
> >> When using the welcome feature the client must subscribe for the welcome
> >> message before trying to connect and server must use xpub, poll for
> incoming
> >> subscriptions and read them(subscriptions can be ignored).
> >>
> >> You can take a look at the test for usage:
> >>
> https://github.com/zeromq/libzmq/blob/master/tests/test_xpub_welcome_msg.cpp
> >>
> >>
> >> Regards,
> >>
> >> Doron
> >>
> >> _______________________________________________
> >> zeromq-dev mailing list
> >> zeromq-dev at lists.zeromq.org
> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >>
> >
> >
> >
> > --
> > Kapp Arnaud - Xaqq
>
>
>
> --
> Kapp Arnaud - Xaqq
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>
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