ZMQ_CONFLATE use-case demo

local_conflate.cpp

/*
    Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "../include/zmq.h"
#include "../include/zmq_utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main (int argc, char *argv [])
{
    const char *bind_to;
    int conflate = 1;
    void *ctx;
    void *s;
    int rc;
    zmq_msg_t msg;

    if (argc < 3) {
        printf ("usage: local_conflate <bind-to> <is-conflate>\n");
        return 1;
    }
    bind_to = argv [1];
    conflate = atoi (argv [2]);

    ctx = zmq_init (1);
    if (!ctx) {
        printf ("error in zmq_init: %s\n", zmq_strerror (errno));
        return -1;
    }

    s = zmq_socket (ctx, ZMQ_DEALER);
    if (!s) {
        printf ("error in zmq_socket: %s\n", zmq_strerror (errno));
        return -1;
    }

    zmq_setsockopt (s, ZMQ_CONFLATE, &conflate, sizeof(conflate));

    int rcvtimeo = -1;
    zmq_setsockopt (s, ZMQ_RCVTIMEO, &rcvtimeo, sizeof(rcvtimeo));

    rc = zmq_bind (s, bind_to);
    if (rc != 0) {
        printf ("error in zmq_bind: %s\n", zmq_strerror (errno));
        return -1;
    }

    rc = zmq_msg_init (&msg);
    if (rc != 0) {
        printf ("error in zmq_msg_init: %s\n", zmq_strerror (errno));
        return -1;
    }

    for (;;) {
        int payload = 0;
        rc = zmq_recv(s, (void*)&payload, sizeof(int), 0);

        if (rc < 0) {
            printf ("error in zmq_recvmsg: %s\n", zmq_strerror (errno));
            return -1;
        }

        // do some work dependent on received data, the
        // result produced must be based on the most up-to-date data
        zmq_sleep(1);
        printf("payload=%d\n", payload);
    }

    rc = zmq_msg_close (&msg);
    if (rc != 0) {
        printf ("error in zmq_msg_close: %s\n", zmq_strerror (errno));
        return -1;
    }

    usleep(10000);

    rc = zmq_close (s);
    if (rc != 0) {
        printf ("error in zmq_close: %s\n", zmq_strerror (errno));
        return -1;
    }

    rc = zmq_term (ctx);
    if (rc != 0) {
        printf ("error in zmq_term: %s\n", zmq_strerror (errno));
        return -1;
    }

    return 0;
}

remote_conflate.cpp

/*
    Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "../include/zmq.h"
#include "../include/zmq_utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main (int argc, char *argv [])
{
    const char *connect_to;
    int roundtrip_count;
    void *ctx;
    void *s;
    int rc;
    int i;
    zmq_msg_t msg;
    int conflate = 0;

    if (argc != 4) {
        printf ("usage: remote_conflate <connect-to> <roundtrip-count> <is-conflate>\n");
        return 1;
    }
    connect_to = argv [1];
    roundtrip_count = atoi (argv [2]);
    conflate = atoi (argv [3]);

    ctx = zmq_init (1);
    if (!ctx) {
        printf ("error in zmq_init: %s\n", zmq_strerror (errno));
        return -1;
    }

    s = zmq_socket (ctx, ZMQ_DEALER);
    if (!s) {
        printf ("error in zmq_socket: %s\n", zmq_strerror (errno));
        return -1;
    }

    zmq_setsockopt (s, ZMQ_CONFLATE, &conflate, sizeof(conflate));

    rc = zmq_connect (s, connect_to);
    if (rc != 0) {
        printf ("error in zmq_connect: %s\n", zmq_strerror (errno));
        return -1;
    }

    int message_size = sizeof(int);
    rc = zmq_msg_init_size (&msg, message_size);
    if (rc != 0) {
        printf ("error in zmq_msg_init_size: %s\n", zmq_strerror (errno));
        return -1;
    }
    memset (zmq_msg_data (&msg), 0, message_size);

    int payload = 0;
    for (i = 0; i != roundtrip_count; i++) {

        payload = i;

        rc = zmq_send (s, (void*)(&payload), message_size, 0);
        if (rc < 0) {
            printf ("error in zmq_sendmsg: %d %s\n", errno, zmq_strerror (errno));
            return -1;
        }

        usleep(10000);
    }

    rc = zmq_msg_close (&msg);
    if (rc != 0) {
        printf ("error in zmq_msg_close: %s\n", zmq_strerror (errno));
        return -1;
    }

    rc = zmq_close (s);
    if (rc != 0) {
        printf ("error in zmq_close: %s\n", zmq_strerror (errno));
        return -1;
    }

    rc = zmq_term (ctx);
    if (rc != 0) {
        printf ("error in zmq_term: %s\n", zmq_strerror (errno));
        return -1;
    }


    return 0;
}