mirror of
https://github.com/zeromq/cppzmq.git
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102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
#include <future>
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#include <iostream>
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#include <string>
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#include "zmq.hpp"
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#include "zmq_addon.hpp"
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void PublisherThread(zmq::context_t *ctx) {
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// Prepare publisher
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zmq::socket_t publisher(*ctx, zmq::socket_type::pub);
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publisher.bind("inproc://#1");
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// Give the subscribers a chance to connect, so they don't lose any messages
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std::this_thread::sleep_for(std::chrono::milliseconds(20));
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while (true) {
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// Write three messages, each with an envelope and content
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publisher.send(zmq::str_buffer("A"), zmq::send_flags::sndmore);
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publisher.send(zmq::str_buffer("Message in A envelope"));
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publisher.send(zmq::str_buffer("B"), zmq::send_flags::sndmore);
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publisher.send(zmq::str_buffer("Message in B envelope"));
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publisher.send(zmq::str_buffer("C"), zmq::send_flags::sndmore);
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publisher.send(zmq::str_buffer("Message in C envelope"));
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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}
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}
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void SubscriberThread1(zmq::context_t *ctx) {
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// Prepare subscriber
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zmq::socket_t subscriber(*ctx, zmq::socket_type::sub);
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subscriber.connect("inproc://#1");
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// Thread2 opens "A" and "B" envelopes
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subscriber.set(zmq::sockopt::subscribe, "A");
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subscriber.set(zmq::sockopt::subscribe, "B");
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while (1) {
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// Receive all parts of the message
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std::vector<zmq::message_t> recv_msgs;
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zmq::recv_result_t result =
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zmq::recv_multipart(subscriber, std::back_inserter(recv_msgs));
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assert(result && "recv failed");
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assert(*result == 2);
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std::cout << "Thread2: [" << recv_msgs[0].to_string() << "] "
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<< recv_msgs[1].to_string() << std::endl;
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}
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}
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void SubscriberThread2(zmq::context_t *ctx) {
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// Prepare our context and subscriber
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zmq::socket_t subscriber(*ctx, zmq::socket_type::sub);
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subscriber.connect("inproc://#1");
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// Thread3 opens ALL envelopes
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subscriber.set(zmq::sockopt::subscribe, "");
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while (1) {
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// Receive all parts of the message
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std::vector<zmq::message_t> recv_msgs;
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zmq::recv_result_t result =
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zmq::recv_multipart(subscriber, std::back_inserter(recv_msgs));
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assert(result && "recv failed");
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assert(*result == 2);
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std::cout << "Thread3: [" << recv_msgs[0].to_string() << "] "
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<< recv_msgs[1].to_string() << std::endl;
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}
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}
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int main() {
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/*
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* No I/O threads are involved in passing messages using the inproc transport.
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* Therefore, if you are using a ØMQ context for in-process messaging only you
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* can initialise the context with zero I/O threads.
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*
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* Source: http://api.zeromq.org/4-3:zmq-inproc
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*/
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zmq::context_t ctx(0);
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auto thread1 = std::async(std::launch::async, PublisherThread, &ctx);
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// Give the publisher a chance to bind, since inproc requires it
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std::this_thread::sleep_for(std::chrono::milliseconds(10));
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auto thread2 = std::async(std::launch::async, SubscriberThread1, &ctx);
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auto thread3 = std::async(std::launch::async, SubscriberThread2, &ctx);
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thread1.wait();
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thread2.wait();
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thread3.wait();
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/*
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* Output:
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* An infinite loop of a mix of:
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* Thread2: [A] Message in A envelope
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* Thread2: [B] Message in B envelope
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* Thread3: [A] Message in A envelope
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* Thread3: [B] Message in B envelope
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* Thread3: [C] Message in C envelope
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*/
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}
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