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| /* no_source_notify.c - see http://ultramessaging.github.io/UMExamples/no_source_notify/c/index.html
*
* Copyright (c) 2005-2017 Informatica Corporation. All Rights Reserved.
* Permission is granted to licensees to use
* or alter this software for any purpose, including commercial applications,
* according to the terms laid out in the Software License Agreement.
*
* This source code example is provided by Informatica for educational
* and evaluation purposes only.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INFORMATICA DISCLAIMS ALL WARRANTIES
* EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF
* NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
* PURPOSE. INFORMATICA DOES NOT WARRANT THAT USE OF THE SOFTWARE WILL BE
* UNINTERRUPTED OR ERROR-FREE. INFORMATICA SHALL NOT, UNDER ANY CIRCUMSTANCES, BE
* LIABLE TO LICENSEE FOR LOST PROFITS, CONSEQUENTIAL, INCIDENTAL, SPECIAL OR
* INDIRECT DAMAGES ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE
* TRANSACTIONS CONTEMPLATED HEREUNDER, EVEN IF INFORMATICA HAS BEEN APPRISED OF
* THE LIKELIHOOD OF SUCH DAMAGES.
*/
#include <stdio.h>
#if defined(_MSC_VER)
/* Windows-only includes */
#include <winsock2.h>
#define SLEEP(s) Sleep((s)*1000)
#else
/* Unix-only includes */
#include <stdlib.h>
#include <unistd.h>
#define SLEEP(s) sleep(s)
#endif
#include <lbm/lbm.h>
/* Example error checking macro. Include after each UM call. */
#define EX_LBM_CHK(err) do { \
if ((err) < 0) { \
fprintf(stderr, "%s:%d, lbm error: '%s'\n", \
__FILE__, __LINE__, lbm_errmsg()); \
exit(1); \
} \
} while (0)
#define NO_SOURCE_QUERIES "25"
int no_source = 0;
/* Callback used to handle request message for receiver */
int rcv_handle_msg(lbm_rcv_t *rcv, lbm_msg_t *msg, void *clientd)
{
switch (msg->type) {
case LBM_MSG_NO_SOURCE_NOTIFICATION:
printf("[%s], no sources found for topic after %s queries\n", msg->topic_name, NO_SOURCE_QUERIES);
no_source++;
break;
default:
printf("Other event, type=%x\n", msg->type);
break;
}
return 0;
} /* rcv_handle_msg */
int main(int argc, char **argv)
{
lbm_context_t *ctx; /* Context object */
lbm_rcv_t *rcv; /* Receive object: for subscribing to topics. */
lbm_topic_t *rtopic; /* Receiver Topic object */
lbm_rcv_topic_attr_t * rattr; /* Receiver attribute object */
int err;
#if defined(_WIN32)
/* windows-specific code */
WSADATA wsadata;
int wsStat = WSAStartup(MAKEWORD(2,2), &wsadata);
if (wsStat != 0)
{
printf("line %d: wsStat=%d\n",__LINE__,wsStat);
exit(1);
}
#endif
/* Initialize context atrributes and create context */
err = lbm_context_create(&ctx, NULL, NULL, NULL);
EX_LBM_CHK(err);
err = lbm_rcv_topic_attr_create(&rattr);
EX_LBM_CHK(err);
err = lbm_rcv_topic_attr_str_setopt(rattr, "resolution_no_source_notification_threshold", NO_SOURCE_QUERIES);
EX_LBM_CHK(err);
err = lbm_rcv_topic_lookup(&rtopic, ctx, "test.topic", rattr);
EX_LBM_CHK(err);
err = lbm_rcv_create(&rcv, ctx, rtopic, rcv_handle_msg, NULL, NULL);
EX_LBM_CHK(err);
while (!no_source) { }
err = lbm_rcv_delete(rcv);
EX_LBM_CHK(err);
err = lbm_context_delete(ctx);
EX_LBM_CHK(err);
#if defined(_MSC_VER)
/* Windows-specific cleanup overhead */
WSACleanup();
#endif
return 0;
} /* main */
|