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