ceph/src/librbd/ConfigWatcher.h

   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