[ceph.git] / ceph / src / librbd / ConfigWatcher.h

// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab

#ifndef CEPH_LIBRBD_CONFIG_WATCHER_H
#define CEPH_LIBRBD_CONFIG_WATCHER_H

#include <set>
#include <string>

struct Context;

namespace librbd {

struct ImageCtx;

template <typename ImageCtxT>
class ConfigWatcher {
public:
  static ConfigWatcher* create(ImageCtxT& image_ctx) {
    return new ConfigWatcher(image_ctx);
  }

  ConfigWatcher(ImageCtxT& image_ctx);
  ~ConfigWatcher();

  ConfigWatcher(const ConfigWatcher&) = delete;
  ConfigWatcher& operator=(const ConfigWatcher&) = delete;

  void init();
  void shut_down();

private:
  struct Observer;

  ImageCtxT& m_image_ctx;

  Observer* m_observer = nullptr;

  void handle_global_config_change(std::set<std::string> changed);

};

} // namespace librbd

extern template class librbd::ConfigWatcher<librbd::ImageCtx>;

#endif // CEPH_LIBRBD_CONFIG_WATCHER_H
Commit	Line	Data
f6b5b4d7 TL	1	// -- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t --
	2	// vim: ts=8 sw=2 smarttab
	3
	4	#ifndef CEPH_LIBRBD_CONFIG_WATCHER_H
	5	#define CEPH_LIBRBD_CONFIG_WATCHER_H
	6
	7	#include <set>
	8	#include <string>
	9
	10	struct Context;
	11
	12	namespace librbd {
	13
	14	struct ImageCtx;
	15
	16	template <typename ImageCtxT>
	17	class ConfigWatcher {
	18	public:
	19	static ConfigWatcher* create(ImageCtxT& image_ctx) {
	20	return new ConfigWatcher(image_ctx);
	21	}
	22
	23	ConfigWatcher(ImageCtxT& image_ctx);
	24	~ConfigWatcher();
	25
	26	ConfigWatcher(const ConfigWatcher&) = delete;
	27	ConfigWatcher& operator=(const ConfigWatcher&) = delete;
	28
	29	void init();
	30	void shut_down();
	31
	32	private:
	33	struct Observer;
	34
	35	ImageCtxT& m_image_ctx;
	36
	37	Observer* m_observer = nullptr;
	38
	39	void handle_global_config_change(std::set<std::string> changed);
	40
	41	};
	42
	43	} // namespace librbd
	44
	45	extern template class librbd::ConfigWatcher<librbd::ImageCtx>;
	46
	47	#endif // CEPH_LIBRBD_CONFIG_WATCHER_H