// get a random db server connection in the range [start_pos, stop_pos)
static CDBServConn* get_db_server_conn_in_range(uint32_t start_pos, uint32_t stop_pos)
{
uint32_t i = 0;
CDBServConn* pDbConn = NULL;
// determine if there is a valid DB server connection
for (i = start_pos; i < stop_pos; i++) {
pDbConn = (CDBServConn*)g_db_server_list[i].serv_conn;
if (pDbConn && pDbConn->IsOpen()) {
break;
}
}
// no valid DB server connection
if (i == stop_pos) {
return NULL;
}
// return a random valid DB server connection
while (true) {
int i = rand() % (stop_pos - start_pos) + start_pos;
pDbConn = (CDBServConn*)g_db_server_list[i].serv_conn;
if (pDbConn && pDbConn->IsOpen()) {
break;
}
}
return pDbConn;
}
static void db_server_conn_timer_callback(void* callback_data, uint8_t msg, uint32_t handle, void* pParam)
{
ConnMap_t::iterator it_old;
CDBServConn* pConn = NULL;
uint64_t cur_time = get_tick_count();
for (ConnMap_t::iterator it = g_db_server_conn_map.begin(); it != g_db_server_conn_map.end(); ) {
it_old = it;
it++;
pConn = (CDBServConn*)it_old->second;
if (pConn->IsOpen()) {
pConn->OnTimer(cur_time);
}
}
// reconnect DB Storage Server
// will reconnect in 4s, 8s, 16s, 32s, 64s, 4s 8s ...
serv_check_reconnect<CDBServConn>(g_db_server_list, g_db_server_count);
}