initial code repo

[stor4nfv.git] / src / ceph / src / journal / JournalPlayer.h

diff --git a/src/ceph/src/journal/JournalPlayer.h b/src/ceph/src/journal/JournalPlayer.h
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+++ b/src/ceph/src/journal/JournalPlayer.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_JOURNAL_JOURNAL_PLAYER_H
+#define CEPH_JOURNAL_JOURNAL_PLAYER_H
+
+#include "include/int_types.h"
+#include "include/Context.h"
+#include "include/rados/librados.hpp"
+#include "common/AsyncOpTracker.h"
+#include "common/Mutex.h"
+#include "journal/JournalMetadata.h"
+#include "journal/ObjectPlayer.h"
+#include "cls/journal/cls_journal_types.h"
+#include <boost/none.hpp>
+#include <boost/optional.hpp>
+#include <map>
+
+class SafeTimer;
+
+namespace journal {
+
+class Entry;
+class ReplayHandler;
+
+class JournalPlayer {
+public:
+  typedef cls::journal::ObjectPosition ObjectPosition;
+  typedef cls::journal::ObjectPositions ObjectPositions;
+  typedef cls::journal::ObjectSetPosition ObjectSetPosition;
+
+  JournalPlayer(librados::IoCtx &ioctx, const std::string &object_oid_prefix,
+                const JournalMetadataPtr& journal_metadata,
+                ReplayHandler *replay_handler);
+  ~JournalPlayer();
+
+  void prefetch();
+  void prefetch_and_watch(double interval);
+  void shut_down(Context *on_finish);
+
+  bool try_pop_front(Entry *entry, uint64_t *commit_tid);
+
+private:
+  typedef std::set<uint8_t> PrefetchSplayOffsets;
+  typedef std::map<uint8_t, ObjectPlayerPtr> SplayedObjectPlayers;
+  typedef std::map<uint8_t, ObjectPosition> SplayedObjectPositions;
+  typedef std::set<uint64_t> ObjectNumbers;
+
+  enum State {
+    STATE_INIT,
+    STATE_PREFETCH,
+    STATE_PLAYBACK,
+    STATE_ERROR
+  };
+
+  enum WatchStep {
+    WATCH_STEP_FETCH_CURRENT,
+    WATCH_STEP_FETCH_FIRST,
+    WATCH_STEP_ASSERT_ACTIVE
+  };
+
+  struct C_Fetch : public Context {
+    JournalPlayer *player;
+    uint64_t object_num;
+    C_Fetch(JournalPlayer *p, uint64_t o) : player(p), object_num(o) {
+      player->m_async_op_tracker.start_op();
+    }
+    ~C_Fetch() override {
+      player->m_async_op_tracker.finish_op();
+    }
+    void finish(int r) override {
+      player->handle_fetched(object_num, r);
+    }
+  };
+
+  struct C_Watch : public Context {
+    JournalPlayer *player;
+    uint64_t object_num;
+    C_Watch(JournalPlayer *player, uint64_t object_num)
+      : player(player), object_num(object_num) {
+      player->m_async_op_tracker.start_op();
+    }
+    ~C_Watch() override {
+      player->m_async_op_tracker.finish_op();
+    }
+
+    void finish(int r) override {
+      player->handle_watch(object_num, r);
+    }
+  };
+
+  librados::IoCtx m_ioctx;
+  CephContext *m_cct;
+  std::string m_object_oid_prefix;
+  JournalMetadataPtr m_journal_metadata;
+
+  ReplayHandler *m_replay_handler;
+
+  AsyncOpTracker m_async_op_tracker;
+
+  mutable Mutex m_lock;
+  State m_state;
+  uint8_t m_splay_offset;
+
+  bool m_watch_enabled;
+  bool m_watch_scheduled;
+  double m_watch_interval;
+  WatchStep m_watch_step = WATCH_STEP_FETCH_CURRENT;
+  bool m_watch_prune_active_tag = false;
+
+  bool m_shut_down = false;
+  bool m_handler_notified = false;
+
+  ObjectNumbers m_fetch_object_numbers;
+
+  PrefetchSplayOffsets m_prefetch_splay_offsets;
+  SplayedObjectPlayers m_object_players;
+
+  bool m_commit_position_valid = false;
+  ObjectPosition m_commit_position;
+  SplayedObjectPositions m_commit_positions;
+  uint64_t m_active_set;
+
+  boost::optional<uint64_t> m_active_tag_tid = boost::none;
+  boost::optional<uint64_t> m_prune_tag_tid = boost::none;
+
+  void advance_splay_object();
+
+  bool is_object_set_ready() const;
+  bool verify_playback_ready();
+  void prune_tag(uint64_t tag_tid);
+  void prune_active_tag(const boost::optional<uint64_t>& tag_tid);
+
+  ObjectPlayerPtr get_object_player() const;
+  ObjectPlayerPtr get_object_player(uint64_t object_number) const;
+  bool remove_empty_object_player(const ObjectPlayerPtr &object_player);
+
+  void process_state(uint64_t object_number, int r);
+  int process_prefetch(uint64_t object_number);
+  int process_playback(uint64_t object_number);
+
+  void fetch(uint64_t object_num);
+  void fetch(const ObjectPlayerPtr &object_player);
+  void handle_fetched(uint64_t object_num, int r);
+  void refetch(bool immediate);
+
+  void schedule_watch(bool immediate);
+  void handle_watch(uint64_t object_num, int r);
+  void handle_watch_assert_active(int r);
+
+  void notify_entries_available();
+  void notify_complete(int r);
+};
+
+} // namespace journal
+
+#endif // CEPH_JOURNAL_JOURNAL_PLAYER_H