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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_CACHER_H
#define CEPH_CONFIG_CACHER_H
#include "common/config_obs.h"
#include "common/config.h"
template <typename ValueT>
class md_config_cacher_t : public md_config_obs_t {
ConfigProxy& conf;
const char* const option_name;
std::atomic<ValueT> value_cache;
const char** get_tracked_conf_keys() const override {
const static char* keys[] = { option_name, nullptr };
return keys;
}
void handle_conf_change(const ConfigProxy& conf,
const std::set<std::string>& changed) override {
if (changed.count(option_name)) {
value_cache.store(conf.get_val<ValueT>(option_name));
}
}
public:
md_config_cacher_t(ConfigProxy& conf,
const char* const option_name)
: conf(conf),
option_name(option_name) {
conf.add_observer(this);
std::atomic_init(&value_cache,
conf.get_val<ValueT>(option_name));
}
~md_config_cacher_t() {
conf.remove_observer(this);
}
operator ValueT() const {
return value_cache.load();
}
};
#endif // CEPH_CONFIG_CACHER_H
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