ceph/src/librbd/watcher/Notifier.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_WATCHER_NOTIFIER_H
   5 #define CEPH_LIBRBD_WATCHER_NOTIFIER_H
   6
   7 #include "include/int_types.h"
   8 #include "include/buffer_fwd.h"
   9 #include "include/Context.h"
  10 #include "include/rados/librados.hpp"
  11 #include "common/Mutex.h"
  12 #include "common/WorkQueue.h"
  13 #include <list>
  14
  15 namespace librbd {
  16
  17 namespace watcher {
  18
  19 struct NotifyResponse;
  20
  21 class Notifier {
  22 public:
  23   static const uint64_t NOTIFY_TIMEOUT;
  24
  25   Notifier(ContextWQ *work_queue, librados::IoCtx &ioctx,
  26            const std::string &oid);
  27   ~Notifier();
  28
  29   void flush(Context *on_finish);
  30   void notify(bufferlist &bl, NotifyResponse *response, Context *on_finish);
  31
  32 private:
  33   typedef std::list<Context*> Contexts;
  34
  35   struct C_AioNotify : public Context {
  36     Notifier *notifier;
  37     NotifyResponse *response;
  38     Context *on_finish;
  39     bufferlist out_bl;
  40
  41     C_AioNotify(Notifier *notifier, NotifyResponse *response,
  42                 Context *on_finish);
  43
  44     void finish(int r) override;
  45   };
  46
  47   ContextWQ *m_work_queue;
  48   librados::IoCtx &m_ioctx;
  49   CephContext *m_cct;
  50   std::string m_oid;
  51
  52   Mutex m_aio_notify_lock;
  53   size_t m_pending_aio_notifies = 0;
  54   Contexts m_aio_notify_flush_ctxs;
  55
  56   void handle_notify(int r, Context *on_finish);
  57
  58 };
  59
  60 } // namespace watcher
  61 } // namespace librbd
  62
  63 #endif // CEPH_LIBRBD_WATCHER_NOTIFIER_H