main()
{
lbm_context_t *ctx; /* Context object */
lbm_context_attr_t * cattr; /* Context attribute 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_ume_rcv_recovery_info_ex_func_t cb; /* Sequence number info callback function */
int err; /* Used for checking API return codes */
#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);
cb.func = ume_rcv_seqnum_ex;
cb.clientd = NULL;
err = lbm_rcv_topic_attr_setopt(rattr, "ume_recovery_sequence_number_info_function", &cb, sizeof(cb));
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 (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
} /* main */
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 */
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_lookup(&rtopic, ctx, "test.topic", NULL);
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 */
int main(int argc, char **argv)
{
lbm_context_t *ctx;
server_t server; /* State information for the server. */
char response_topic_name[256];
int err;
/* Get (pretty much) unique client name. */
sprintf(response_topic_name, "Client.%lx.Response", (long)getpid());
#if defined(_MSC_VER)
/* 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
server.ctx = NULL;
server.topic_name = "Server1.Request";
server.src = NULL; /* Source to send requests to server. */
server.rcv = NULL; /* Receiver for responses from server. */
server.state = 0; /* Waiting for registration. */
err = lbm_config("client.cfg");
EX_LBM_CHK(err);
err = lbm_context_create(&ctx, NULL, NULL, NULL);
EX_LBM_CHK(err);
server.ctx = ctx;
/* Create source to send requests to server. */
{
lbm_topic_t *topic;
err = lbm_src_topic_alloc(&topic, ctx, server.topic_name, NULL);
EX_LBM_CHK(err);
err = lbm_src_create(&server.src, ctx, topic, NULL, NULL, NULL);
EX_LBM_CHK(err);
}
/* Create receiver for responses from server. */
{
lbm_topic_t *topic;
err = lbm_rcv_topic_lookup(&topic, ctx, response_topic_name, NULL);
EX_LBM_CHK(err);
err = lbm_rcv_create(&server.rcv, ctx, topic, response_rcv_cb, &server, NULL);
EX_LBM_CHK(err);
}
/* Register with the server. May need multiple tries. */
{
int try_cnt = 0;
int backoff_delay;
char register_msg[257];
sprintf(register_msg, "r%s", response_topic_name);
backoff_delay = 1; /* In milliseconds. */
MSLEEP(backoff_delay); /* Let TR complete. */
while (server.state == 0) {
try_cnt ++;
err = lbm_src_send(server.src, register_msg,
strlen(register_msg) + 1, LBM_MSG_FLUSH | LBM_SRC_BLOCK);
EX_LBM_CHK(err);
printf("Sent '%s' to %s\n", register_msg, server.topic_name);
/* Exponential backoff, to max of 1 sec. */
backoff_delay *= 2; /* Exponential backoff to max of 1 sec. */
if (backoff_delay > 1000) {
backoff_delay = 1000;
}
MSLEEP(backoff_delay); /* Wait for server response. */
}
printf("Took %d tries to register with server.\n", try_cnt);
}
/* Main work of the program, which includes sending 5 requests. */
{
int i;
char send_buf[500];
req_hdr_t *req_hdr = (req_hdr_t *)send_buf;
memset((char *)req_hdr, '0', sizeof(req_hdr_t));
req_hdr->data[0] = 'R';
for (i = 0; i < 5; i++) {
/* The application builds a request into <tt>request_msg</tt>. */
char request_msg[257];
sprintf(request_msg, "%s.%d", response_topic_name, i);
/* The application message is copied in after the header. */
strcpy(&send_buf[sizeof(req_hdr_t)], request_msg);
err = lbm_src_send(server.src, send_buf, strlen(send_buf) + 1,
LBM_MSG_FLUSH | LBM_SRC_NONBLOCK);
EX_LBM_CHK(err);
MSLEEP(1000);
}
}
printf("Client exiting.\n");
err = lbm_rcv_delete(server.rcv);
EX_LBM_CHK(err);
err = lbm_src_delete(server.src);
EX_LBM_CHK(err);
err = lbm_context_delete(ctx);
EX_LBM_CHK(err);
#if defined(_MSC_VER)
WSACleanup();
#endif
return 0;
} /* main */
