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| /* source_notify_callbacks.c - see http://ultramessaging.github.io/UMExamples/source_notify_callbacks/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>
/* State structure associated with each source the receiver is joined to. */
typedef struct source_state_s {
int msgs_rcvd; /* Track message count from each source. */
} source_state_t;
/* 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)
void *new_src_notification_callback(const char *source_name, void *clientd)
{
source_state_t *source_state = (source_state_t *)malloc(sizeof(source_state_t));
source_state->msgs_rcvd = 0;
printf("Delivery Controller Created: %s\n", source_name);
return source_state; /* This will be available in the receive callback as msg->source_clientd. */
} /* new_src_notification_callback */
int src_delete_notification_callback(const char *source_name, void *clientd, void* src_clientd )
{
free(src_clientd); /* This was created by new_src_notification_callback() */
printf("Delivery Controller Deleted: %s\n", source_name);
return 0;
} /* src_delete_notification_callback */
/* Callback used to handle request message for receiver */
int rcv_handle_msg(lbm_rcv_t *rcv, lbm_msg_t *msg, void *clientd)
{
source_state_t *source_state = (source_state_t *)msg->source_clientd;
switch (msg->type) {
case LBM_MSG_DATA:
source_state->msgs_rcvd ++;
printf("[%s][%s], Received message %d\n", msg->topic_name, msg->source, source_state->msgs_rcvd);
break;
case LBM_MSG_BOS:
printf("[%s][%s], Beginning of Transport Session\n", msg->topic_name, msg->source);
break;
case LBM_MSG_EOS:
printf("[%s][%s], End of Transport Session\n", msg->topic_name, msg->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 messages. */
lbm_topic_t *rtopic; /* Receiver Topic object */
lbm_rcv_topic_attr_t * rattr; /* Receiver attribute object */
lbm_rcv_src_notification_func_t srccb; /* Source notify callback structure */
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);
/* Create receiver for receiving request and sending response */
err = lbm_rcv_topic_attr_create(&rattr);
EX_LBM_CHK(err);
srccb.create_func = new_src_notification_callback;
srccb.delete_func = src_delete_notification_callback;
err = lbm_rcv_topic_attr_setopt(rattr, "source_notification_function", &srccb, sizeof(srccb));
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);
/* Wait forever (or until control-c). */
while (1) { }
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 */
|