004 ZeroMQ <PUB XSUB-XPUB SUB>模式

这篇文章是第2篇的扩展
框架：

提供中间代码(XSUB-proxy-XSUB)。前、后端的代码可以参考第2篇文章，只是连接方式改成了connect而不是bind，所有要bind的endpoint都在中间代理中。

#include<zmq.h>#include<iostream>using std::endl;using std::cout;int main(){    void* pContext = zmq_ctx_new();    void* pXsubSocket = zmq_socket(pContext, ZMQ_XSUB);    //定阅所有消息;    zmq_setsockopt(pXsubSocket, ZMQ_SUBSCRIBE, 0, 0);      int highWaterLevel = 2000;    //设置接收与发送的高水位;    zmq_setsockopt(pXsubSocket, ZMQ_RCVHWM, &highWaterLevel, sizeof(highWaterLevel));    zmq_setsockopt(pXsubSocket, ZMQ_SNDHWM, &highWaterLevel, sizeof(highWaterLevel));    zmq_bind(pXsubSocket, "tcp://*:6001"); //前端绑定;    void* pXpubSocket = zmq_socket(pContext, ZMQ_XPUB);    //设置接收与发送的高水位;    zmq_setsockopt(pXpubSocket, ZMQ_RCVHWM, &highWaterLevel, sizeof(highWaterLevel));    zmq_setsockopt(pXpubSocket, ZMQ_SNDHWM, &highWaterLevel, sizeof(highWaterLevel));    zmq_bind(pXpubSocket, "tcp://*:6002");//后端绑定;    cout << "start proxy..." << endl;    zmq_proxy(pXsubSocket, pXpubSocket, NULL); //循环代理工作;    zmq_close(pXpubSocket);    zmq_close(pXsubSocket);    zmq_ctx_destroy(pContext);    return 0;}

结果：