004 ZeroMQ 模式

這篇文章是第2篇的擴展
框架：

提供中間代碼(XSUB-proxy-XSUB)。前、後端的代碼可以參考第2篇文章，只是連接方式改成了connect而不是bind，所有要bind的endpoint都在中間代理中。

#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);
    //定閱所有消息;
    zmq_setsockopt(pXsubSocket, ZMQ_SUBSCRIBE, 0, 0);  
    int highWaterLevel = 2000;
    //設置接收與發送的高水位;
    zmq_setsockopt(pXsubSocket, ZMQ_RCVHWM, &highWaterLevel, sizeof(highWaterLevel));
    zmq_setsockopt(pXsubSocket, ZMQ_SNDHWM, &highWaterLevel, sizeof(highWaterLevel));
    zmq_bind(pXsubSocket, "tcp://*:6001"); //前端綁定;

    void* pXpubSocket = zmq_socket(pContext, ZMQ_XPUB);
    //設置接收與發送的高水位;
    zmq_setsockopt(pXpubSocket, ZMQ_RCVHWM, &highWaterLevel, sizeof(highWaterLevel));
    zmq_setsockopt(pXpubSocket, ZMQ_SNDHWM, &highWaterLevel, sizeof(highWaterLevel));
    zmq_bind(pXpubSocket, "tcp://*:6002");//後端綁定;

    cout << "start proxy..." << endl;
    zmq_proxy(pXsubSocket, pXpubSocket, NULL); //循環代理工作;

    zmq_close(pXpubSocket);
    zmq_close(pXsubSocket);
    zmq_ctx_destroy(pContext);
    return 0;
}

結果：