MonClient/sub_want&renew_subs
文件
:MonClient/sub_want&renew_subs
方法:
bool sub_want(string what, version_t start, unsigned flags)
void renew_subs()
涉及的方法:
bool _sub_want(string what, version_t start, unsigned flags)
void _renew_subs()
涉及的數據結構:
map<string,ceph_mon_subscribe_item> sub_new;
map<string,ceph_mon_subscribe_item> sub_sent;
- sub_new中保存的是想要訂閱的map/version集合,但是還沒有想monitor發起訂閱請求
- sub_sent保存的是已經向monitor發起的map/version集合
細節實現:
在sub_want獲取monc_lock鎖,主要邏輯都下方到_sub_want中。
bool sub_want(string what, version_t start, unsigned flags) {
Mutex::Locker l(monc_lock);
return _sub_want(what, start, flags);
}
向sub_new中注入要訂閱的map/version;其主要邏輯是判斷要訂閱的map/version是否已經在sub_new或者sub_sent中,如果存在就返回false,
否則就將要訂閱的map/version添加到sub_new中,並返回true
bool _sub_want(string what, version_t start, unsigned flags) {
if ((sub_new.count(what) == 0 &&
sub_sent.count(what) &&
sub_sent[what].start == start &&
sub_sent[what].flags == flags) ||
(sub_new.count(what) &&
sub_new[what].start == start &&
sub_new[what].flags == flags))
return false;
sub_new[what].start = start;
sub_new[what].flags = flags;
return true;
}
將sub_new中要訂閱的map/version,發送給monitor服務,並將sub_new中的元素合併到sub_sent中,再清空sub_new。
void renew_subs() {
Mutex::Locker l(monc_lock);
_renew_subs();
}
void MonClient::_renew_subs()
{
assert(monc_lock.is_locked());
if (sub_new.empty()) {
ldout(cct, 10) << "renew_subs - empty" << dendl;
return;
}
ldout(cct, 10) << "renew_subs" << dendl;
if (cur_mon.empty())
_reopen_session();
else {
if (sub_renew_sent == utime_t())
sub_renew_sent = ceph_clock_now(cct);
MMonSubscribe *m = new MMonSubscribe;
m->what = sub_new;
_send_mon_message(m);
// update sub_sent with sub_new
sub_new.insert(sub_sent.begin(), sub_sent.end());
std::swap(sub_new, sub_sent);
sub_new.clear();
}
}