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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_CONFIG_OBS_H
#define CEPH_CONFIG_OBS_H
#include <set>
#include <string>
#include "common/config_fwd.h"
namespace ceph {
/** @brief Base class for configuration observers.
* Use this as a base class for your object if it has to respond to configuration changes,
* for example by updating some values or modifying its behavior.
* Subscribe for configuration changes by calling the md_config_t::add_observer() method
* and unsubscribe using md_config_t::remove_observer().
*/
template<class ConfigProxy>
class md_config_obs_impl {
public:
virtual ~md_config_obs_impl() {}
/** @brief Get a table of strings specifying the configuration keys in which the object is interested.
* This is called when the object is subscribed to configuration changes with add_observer().
* The returned table should not be freed until the observer is removed with remove_observer().
* Note that it is not possible to change the set of tracked keys without re-subscribing. */
virtual const char** get_tracked_conf_keys() const = 0;
/// React to a configuration change.
virtual void handle_conf_change(const ConfigProxy& conf,
const std::set <std::string> &changed) = 0;
/// Unused for now
virtual void handle_subsys_change(const ConfigProxy& conf,
const std::set<int>& changed) { }
};
}
using md_config_obs_t = ceph::md_config_obs_impl<ConfigProxy>;
#endif
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