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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_MON_SESSION_H
#define CEPH_MON_SESSION_H
#include "mon_types.h"
#include "msg/msg_types.h"
#include "include/xlist.h"
#include "auth/AuthServiceHandler.h"
#include "global/global_context.h"
#include "MonCaps.h"
struct MonSession;
struct Subscription {
MonSession *session;
string type;
xlist<Subscription*>::item type_item;
version_t next;
bool onetime;
bool incremental_onetime; // has CEPH_FEATURE_INCSUBOSDMAP
Subscription(MonSession *s, const string& t) : session(s), type(t), type_item(this),
next(0), onetime(false), incremental_onetime(false) {};
};
struct MonSession : public RefCountedObject {
Connection *con;
entity_inst_t inst;
utime_t until;
utime_t time_established;
bool closed;
xlist<MonSession*>::item item;
set<uint64_t> routed_request_tids;
MonCaps caps;
uint64_t global_id;
uint64_t notified_global_id;
map<string, Subscription*> sub_map;
AuthServiceHandler *auth_handler;
Connection *proxy_con;
uint64_t proxy_tid;
MonSession(const entity_inst_t& i, Connection *c) :
con(c->get()), inst(i), closed(false), item(this),
global_id(0), notified_global_id(0), auth_handler(NULL),
proxy_con(NULL), proxy_tid(0) {
time_established = ceph_clock_now(g_ceph_context);
}
~MonSession() {
if (con)
con->put();
if (proxy_con)
proxy_con->put();
//generic_dout(0) << "~MonSession " << this << dendl;
// we should have been removed before we get destructed; see MonSessionMap::remove_session()
assert(!item.is_on_list());
assert(sub_map.empty());
delete auth_handler;
}
};
struct MonSessionMap {
xlist<MonSession*> sessions;
map<string, xlist<Subscription*>* > subs;
multimap<int, MonSession*> by_osd;
MonSessionMap() {}
~MonSessionMap() {
while (!subs.empty()) {
assert(subs.begin()->second->empty());
delete subs.begin()->second;
subs.erase(subs.begin());
}
}
void remove_session(MonSession *s) {
assert(!s->closed);
for (map<string,Subscription*>::iterator p = s->sub_map.begin(); p != s->sub_map.end(); ++p) {
p->second->type_item.remove_myself();
delete p->second;
}
s->sub_map.clear();
s->item.remove_myself();
if (s->inst.name.is_osd()) {
for (multimap<int,MonSession*>::iterator p = by_osd.find(s->inst.name.num());
p->first == s->inst.name.num();
p++)
if (p->second == s) {
by_osd.erase(p);
break;
}
}
s->closed = true;
s->put();
}
MonSession *new_session(const entity_inst_t& i, Connection *c) {
MonSession *s = new MonSession(i, c);
sessions.push_back(&s->item);
if (i.name.is_osd())
by_osd.insert(pair<int,MonSession*>(i.name.num(), s));
s->get(); // caller gets a ref
return s;
}
MonSession *get_random_osd_session() {
// ok, this isn't actually random, but close enough.
if (by_osd.empty())
return 0;
int n = by_osd.rbegin()->first + 1;
int r = rand() % n;
multimap<int,MonSession*>::iterator p = by_osd.lower_bound(r);
if (p == by_osd.end())
p--;
return p->second;
}
void add_update_sub(MonSession *s, const string& what, version_t start, bool onetime, bool incremental_onetime) {
Subscription *sub = 0;
if (s->sub_map.count(what)) {
sub = s->sub_map[what];
} else {
sub = new Subscription(s, what);
s->sub_map[what] = sub;
if (!subs.count(what))
subs[what] = new xlist<Subscription*>;
subs[what]->push_back(&sub->type_item);
}
sub->next = start;
sub->onetime = onetime;
sub->incremental_onetime = onetime && incremental_onetime;
}
void remove_sub(Subscription *sub) {
sub->session->sub_map.erase(sub->type);
sub->type_item.remove_myself();
delete sub;
}
};
inline ostream& operator<<(ostream& out, const MonSession *s)
{
out << "MonSession: " << s->inst << " is "
<< (s->closed ? "closed" : "open");
out << s->caps;
return out;
}
#endif
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