Question

我是zeromq的新手，我稍微修改了zeromq示例以测试pub-sub模式的行为，订阅者订阅了两个主题“ABC”和“ABD”，一切顺利，但是当我重新启动发布者时，在订户方仅收到“ABD”。为什么呢？

子

#include "zhelpers.hpp"

int main () 
{
    //  Prepare our context and subscriber
    zmq::context_t context(1);
    zmq::socket_t subscriber (context, ZMQ_SUB);
    subscriber.connect("tcp://localhost:5563");
    subscriber.setsockopt( ZMQ_SUBSCRIBE, "ABC", 3);
    subscriber.setsockopt( ZMQ_SUBSCRIBE, "ABD", 3);

    while (1) {

            //  Read envelope with address
            std::string address = s_recv (subscriber);
            //  Read message contents
            std::string contents = s_recv (subscriber);

            std::cout << "[" << address << "] " << contents << std::endl;
    }
    return 0;
}

酒馆

#include "zhelpers.hpp"

int main () 
{
   //  Prepare our context and publisher
   zmq::context_t context(1);
   zmq::socket_t publisher(context, ZMQ_PUB);
   publisher.bind("tcp://*:5563");

   while (1) 
   {
        //  Write two messages, each with an envelope and content
        s_sendmore (publisher, "ABC");
        s_send (publisher, "We don't want to see this");
        s_sendmore (publisher, "ABD");
        s_send (publisher, "We would like to see this");
        sleep (1);
    }
    return 0;
}

输出

[ABC] We don't want to see this
[ABD] We would like to see this
[ABC] We don't want to see this
[ABD] We would like to see this
[ABC] We don't want to see this
[ABD] We would like to see this  
//kill and restart publisher
[ABD] We would like to see this
[ABD] We would like to see this
[ABD] We would like to see this
[ABD] We would like to see this
[ABD] We would like to see this

Answer 1

我不知道你是否解决了这个问题，但我也面临着这种情况。这是ZMQ的一个问题，它实际上是在4.0.4版本中解决的（见this thread）。

问候。

发布商在zeromq重启后订阅丢失

1 个答案: