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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_WATCH_H
#define CEPH_WATCH_H
#include <map>
#include "common/config.h"
#include "OSD.h"
class MWatchNotify;
/* keeps track and accounts sessions, watchers and notifiers */
class Watch {
uint64_t notif_id;
public:
enum WatcherState {
WATCHER_PENDING,
WATCHER_NOTIFIED,
};
struct Notification {
std::map<entity_name_t, WatcherState> watchers;
entity_name_t name;
uint64_t id;
OSD::Session *session;
uint64_t cookie;
MWatchNotify *reply;
Context *timeout;
void *obc;
pg_t pgid;
bufferlist bl;
void add_watcher(const entity_name_t& name, WatcherState state) {
watchers[name] = state;
}
Notification(entity_name_t& n, OSD::Session *s, uint64_t c, bufferlist& b)
: name(n), id(0), session(s), cookie(c), reply(0), timeout(0),
obc(0), bl(b) { }
};
class C_NotifyTimeout : public Context {
OSD *osd;
Notification *notif;
public:
C_NotifyTimeout(OSD *_osd, Notification *_notif) : osd(_osd), notif(_notif) {}
void finish(int r);
};
class C_WatchTimeout : public Context {
OSD *osd;
void *obc;
void *pg;
entity_name_t entity;
public:
utime_t expire;
C_WatchTimeout(OSD *_osd, void *_obc, void *_pg,
entity_name_t _entity, utime_t _expire) :
osd(_osd), obc(_obc), pg(_pg), entity(_entity), expire(_expire) {}
void finish(int r);
};
private:
std::map<uint64_t, Notification *> notifs; /* notif_id to notifications */
public:
Watch() : notif_id(0) {}
void add_notification(Notification *notif) {
notif->id = ++notif_id;
notifs[notif->id] = notif;
}
Notification *get_notif(uint64_t id) {
map<uint64_t, Notification *>::iterator iter = notifs.find(id);
if (iter != notifs.end())
return iter->second;
return NULL;
}
void remove_notification(Notification *notif) {
map<uint64_t, Notification *>::iterator iter = notifs.find(notif->id);
if (iter != notifs.end())
notifs.erase(iter);
}
bool ack_notification(entity_name_t& watcher, Notification *notif);
};
#endif
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