ceph/src/librbd/MirroringWatcher.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_MIRRORING_WATCHER_H
   5 #define CEPH_LIBRBD_MIRRORING_WATCHER_H
   6
   7 #include "include/int_types.h"
   8 #include "cls/rbd/cls_rbd_types.h"
   9 #include "librbd/ImageCtx.h"
  10 #include "librbd/Watcher.h"
  11 #include "librbd/mirroring_watcher/Types.h"
  12
  13 namespace librados {
  14   class IoCtx;
  15 }
  16
  17 namespace librbd {
  18
  19 namespace watcher {
  20 namespace util {
  21 template <typename> struct HandlePayloadVisitor;
  22 }
  23 }
  24
  25 template <typename ImageCtxT = librbd::ImageCtx>
  26 class MirroringWatcher : public Watcher {
  27   friend struct watcher::util::HandlePayloadVisitor<MirroringWatcher<ImageCtxT>>;
  28
  29 public:
  30   MirroringWatcher(librados::IoCtx &io_ctx, ContextWQ *work_queue);
  31
  32   static int notify_mode_updated(librados::IoCtx &io_ctx,
  33                                  cls::rbd::MirrorMode mirror_mode);
  34   static void notify_mode_updated(librados::IoCtx &io_ctx,
  35                                   cls::rbd::MirrorMode mirror_mode,
  36                                   Context *on_finish);
  37
  38   static int notify_image_updated(librados::IoCtx &io_ctx,
  39                                   cls::rbd::MirrorImageState mirror_image_state,
  40                                   const std::string &image_id,
  41                                   const std::string &global_image_id);
  42   static void notify_image_updated(librados::IoCtx &io_ctx,
  43                                    cls::rbd::MirrorImageState mirror_image_state,
  44                                    const std::string &image_id,
  45                                    const std::string &global_image_id,
  46                                    Context *on_finish);
  47
  48   virtual void handle_mode_updated(cls::rbd::MirrorMode mirror_mode) = 0;
  49   virtual void handle_image_updated(cls::rbd::MirrorImageState state,
  50                                     const std::string &image_id,
  51                                     const std::string &global_image_id) = 0;
  52
  53 private:
  54   bool handle_payload(const mirroring_watcher::ModeUpdatedPayload &payload,
  55                       Context *on_notify_ack);
  56   bool handle_payload(const mirroring_watcher::ImageUpdatedPayload &payload,
  57                       Context *on_notify_ack);
  58   bool handle_payload(const mirroring_watcher::UnknownPayload &payload,
  59                       Context *on_notify_ack);
  60
  61   void handle_notify(uint64_t notify_id, uint64_t handle,
  62                      uint64_t notifier_id, bufferlist &bl) override;
  63 };
  64
  65 } // namespace librbd
  66
  67 extern template class librbd::MirroringWatcher<librbd::ImageCtx>;
  68
  69 #endif // CEPH_LIBRBD_MIRRORING_WATCHER_H