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February 21, 2011 10:25
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// | |
// Custom routing Router to Dealer (XREP to XREQ) | |
// | |
// Changes for 2.1: | |
// - added version assertion | |
// | |
#include "zhelpers.h" | |
static void * | |
syslog_monitor (void *monitor) { | |
while (1) { | |
zmq_msg_t message; | |
zmq_msg_init (&message); | |
if (zmq_recv (monitor, &message, 0)) | |
exit (1); // Context terminated, exit | |
int size = zmq_msg_size (&message); | |
char *string = malloc (size + 1); | |
memcpy (string, zmq_msg_data (&message), size); | |
zmq_msg_close (&message); | |
string [size] = 0; | |
printf ("E: (syslog) %s\n", string); | |
} | |
return NULL; | |
} | |
// We have two workers, here we copy the code, normally these would | |
// run on different boxes... | |
// | |
void *worker_a (void *args) { | |
void *context = zmq_init (1); | |
void *worker = zmq_socket (context, ZMQ_XREQ); | |
zmq_setsockopt (worker, ZMQ_IDENTITY, "A", 1); | |
zmq_connect (worker, "ipc://routing.ipc"); | |
int total = 0; | |
while (1) { | |
// We receive one part, with the workload | |
printf ("?1"); fflush (stdout); | |
char *request = s_recv (worker); | |
int finished = (strcmp (request, "END") == 0); | |
free (request); | |
if (finished) { | |
printf ("A received: %d\n", total); | |
break; | |
} | |
total++; | |
} | |
return (NULL); | |
} | |
void *worker_b (void *args) { | |
void *context = zmq_init (1); | |
void *worker = zmq_socket (context, ZMQ_XREQ); | |
zmq_setsockopt (worker, ZMQ_IDENTITY, "B", 1); | |
zmq_connect (worker, "ipc://routing.ipc"); | |
int total = 0; | |
while (1) { | |
// We receive one part, with the workload | |
printf ("?2"); fflush (stdout); | |
char *request = s_recv (worker); | |
int finished = (strcmp (request, "END") == 0); | |
free (request); | |
if (finished) { | |
printf ("B received: %d\n", total); | |
break; | |
} | |
total++; | |
} | |
return (NULL); | |
} | |
int main () { | |
s_version_assert (2, 1); | |
void *context = zmq_init (1); | |
// Start syslog monitor | |
// Bind subscriber socket to sys://log | |
void *monitor = zmq_socket (context, ZMQ_SUB); | |
zmq_connect (monitor, "sys://log"); | |
zmq_setsockopt (monitor, ZMQ_SUBSCRIBE, NULL, 0); | |
pthread_t thread; | |
pthread_create (&thread, NULL, syslog_monitor, monitor); | |
void *client = zmq_socket (context, ZMQ_XREP); | |
zmq_bind (client, "ipc://routing.ipc"); | |
pthread_t worker; | |
pthread_create (&worker, NULL, worker_a, NULL); | |
pthread_create (&worker, NULL, worker_b, NULL); | |
// Send 10 tasks scattered to A twice as often as B | |
int task_nbr; | |
srandom ((unsigned) time (NULL)); | |
for (task_nbr = 0; task_nbr < 10; task_nbr++) { | |
// Send two message parts, first the address... | |
if (randof (3) > 0) | |
s_sendmore (client, "xA"); | |
else | |
s_sendmore (client, "yB"); | |
// And then the workload | |
s_send (client, "This is the workload"); | |
printf ("."); fflush (stdout); | |
} | |
s_sendmore (client, "A"); | |
s_send (client, "END"); | |
s_sendmore (client, "B"); | |
s_send (client, "END"); | |
// Wait for threads to stabilize | |
zmq_close (client); | |
puts ("Before zmq_term..."); fflush (stdout); | |
zmq_term (context); | |
puts ("After zmq_term..."); fflush (stdout); | |
sleep (1); | |
return 0; | |
} |
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/* ========================================================================= | |
zhelpers.h | |
Helper header file for example applications. | |
------------------------------------------------------------------------- | |
Copyright (c) 1991-2010 iMatix Corporation <www.imatix.com> | |
Copyright other contributors as noted in the AUTHORS file. | |
This file is part of the ZeroMQ Guide: http://zguide.zeromq.org | |
This 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. | |
This software is distributed in the hope that it will be useful, but | |
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABIL- | |
ITY 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/>. | |
========================================================================= | |
*/ | |
#ifndef __ZHELPERS_H_INCLUDED__ | |
#define __ZHELPERS_H_INCLUDED__ | |
// Include a bunch of headers that we will need in the examples | |
#include <zmq.h> | |
#include <pthread.h> | |
#include <stdint.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <stdarg.h> | |
#include <string.h> | |
#include <sys/time.h> | |
#include <time.h> | |
#include <unistd.h> | |
#include <assert.h> | |
// Bring Windows MSVC up to C99 scratch | |
#if (defined (__WINDOWS__)) | |
typedef unsigned long ulong; | |
typedef unsigned int uint; | |
typedef __int64 int64_t; | |
#endif | |
// Provide random number from 0..(num-1) | |
#define randof(num) (int) ((float) (num) * random () / (RAND_MAX + 1.0)) | |
// Receive 0MQ string from socket and convert into C string | |
// Caller must free returned string. | |
static char * | |
s_recv (void *socket) { | |
zmq_msg_t message; | |
zmq_msg_init (&message); | |
if (zmq_recv (socket, &message, 0)) | |
exit (1); // Context terminated, exit | |
int size = zmq_msg_size (&message); | |
char *string = malloc (size + 1); | |
memcpy (string, zmq_msg_data (&message), size); | |
zmq_msg_close (&message); | |
string [size] = 0; | |
return (string); | |
} | |
// Convert C string to 0MQ string and send to socket | |
static int | |
s_send (void *socket, char *string) { | |
int rc; | |
zmq_msg_t message; | |
zmq_msg_init_size (&message, strlen (string)); | |
memcpy (zmq_msg_data (&message), string, strlen (string)); | |
rc = zmq_send (socket, &message, 0); | |
assert (!rc); | |
zmq_msg_close (&message); | |
return (rc); | |
} | |
// Sends string as 0MQ string, as multipart non-terminal | |
static int | |
s_sendmore (void *socket, char *string) { | |
int rc; | |
zmq_msg_t message; | |
zmq_msg_init_size (&message, strlen (string)); | |
memcpy (zmq_msg_data (&message), string, strlen (string)); | |
rc = zmq_send (socket, &message, ZMQ_SNDMORE); | |
zmq_msg_close (&message); | |
assert (!rc); | |
return (rc); | |
} | |
// Receives all message parts from socket, prints neatly | |
// | |
static void | |
s_dump (void *socket) | |
{ | |
puts ("----------------------------------------"); | |
while (1) { | |
// Process all parts of the message | |
zmq_msg_t message; | |
zmq_msg_init (&message); | |
zmq_recv (socket, &message, 0); | |
// Dump the message as text or binary | |
char *data = zmq_msg_data (&message); | |
int size = zmq_msg_size (&message); | |
int is_text = 1; | |
int char_nbr; | |
for (char_nbr = 0; char_nbr < size; char_nbr++) | |
if ((unsigned char) data [char_nbr] < 32 | |
|| (unsigned char) data [char_nbr] > 127) | |
is_text = 0; | |
printf ("[%03d] ", size); | |
for (char_nbr = 0; char_nbr < size; char_nbr++) { | |
if (is_text) | |
printf ("%c", data [char_nbr]); | |
else | |
printf ("%02X", (unsigned char) data [char_nbr]); | |
} | |
printf ("\n"); | |
int64_t more; // Multipart detection | |
size_t more_size = sizeof (more); | |
zmq_getsockopt (socket, ZMQ_RCVMORE, &more, &more_size); | |
zmq_msg_close (&message); | |
if (!more) | |
break; // Last message part | |
} | |
} | |
// Set simple random printable identity on socket | |
// | |
static void | |
s_set_id (void *socket) | |
{ | |
char identity [10]; | |
sprintf (identity, "%04X-%04X", randof (0x10000), randof (0x10000)); | |
zmq_setsockopt (socket, ZMQ_IDENTITY, identity, strlen (identity)); | |
} | |
// Report 0MQ version number | |
// | |
static void | |
s_version (void) | |
{ | |
int major, minor, patch; | |
zmq_version (&major, &minor, &patch); | |
printf ("Current 0MQ version is %d.%d.%d\n", major, minor, patch); | |
} | |
// Require at least some specified version | |
static void | |
s_version_assert (int want_major, int want_minor) | |
{ | |
int major, minor, patch; | |
zmq_version (&major, &minor, &patch); | |
if (major < want_major | |
|| (major == want_major && minor < want_minor)) { | |
printf ("Current 0MQ version is %d.%d\n", major, minor); | |
printf ("Application needs at least %d.%d - cannot continue\n", major, minor); | |
exit (EXIT_FAILURE); | |
} | |
} | |
#endif |
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