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" <[email protected]> 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 <[email protected]> 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 <[email protected]> > 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 > >> [email protected] > >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev > >> > > > > > > > > -- > > Kapp Arnaud - Xaqq > > > > -- > Kapp Arnaud - Xaqq > _______________________________________________ > zeromq-dev mailing list > [email protected] > http://lists.zeromq.org/mailman/listinfo/zeromq-dev >
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