initial code repo

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

diff --git a/src/ceph/src/journal/ObjectPlayer.h b/src/ceph/src/journal/ObjectPlayer.h
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+++ b/src/ceph/src/journal/ObjectPlayer.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_OBJECT_PLAYER_H
+#define CEPH_JOURNAL_OBJECT_PLAYER_H
+
+#include "include/Context.h"
+#include "include/interval_set.h"
+#include "include/rados/librados.hpp"
+#include "common/Cond.h"
+#include "common/Mutex.h"
+#include "common/RefCountedObj.h"
+#include "journal/Entry.h"
+#include <list>
+#include <string>
+#include <boost/intrusive_ptr.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/unordered_map.hpp>
+#include "include/assert.h"
+
+class SafeTimer;
+
+namespace journal {
+
+class ObjectPlayer;
+typedef boost::intrusive_ptr<ObjectPlayer> ObjectPlayerPtr;
+
+class ObjectPlayer : public RefCountedObject {
+public:
+  typedef std::list<Entry> Entries;
+  typedef interval_set<uint64_t> InvalidRanges;
+
+  enum RefetchState {
+    REFETCH_STATE_NONE,
+    REFETCH_STATE_REQUIRED,
+    REFETCH_STATE_IMMEDIATE
+  };
+
+  ObjectPlayer(librados::IoCtx &ioctx, const std::string &object_oid_prefix,
+               uint64_t object_num, SafeTimer &timer, Mutex &timer_lock,
+               uint8_t order, uint64_t max_fetch_bytes);
+  ~ObjectPlayer() override;
+
+  inline const std::string &get_oid() const {
+    return m_oid;
+  }
+  inline uint64_t get_object_number() const {
+    return m_object_num;
+  }
+
+  void fetch(Context *on_finish);
+  void watch(Context *on_fetch, double interval);
+  void unwatch();
+
+  void front(Entry *entry) const;
+  void pop_front();
+  inline bool empty() const {
+    Mutex::Locker locker(m_lock);
+    return m_entries.empty();
+  }
+
+  inline void get_entries(Entries *entries) {
+    Mutex::Locker locker(m_lock);
+    *entries = m_entries;
+  }
+  inline void get_invalid_ranges(InvalidRanges *invalid_ranges) {
+    Mutex::Locker locker(m_lock);
+    *invalid_ranges = m_invalid_ranges;
+  }
+
+  inline bool refetch_required() const {
+    return (get_refetch_state() != REFETCH_STATE_NONE);
+  }
+  inline RefetchState get_refetch_state() const {
+    return m_refetch_state;
+  }
+  inline void set_refetch_state(RefetchState refetch_state) {
+    m_refetch_state = refetch_state;
+  }
+
+private:
+  typedef std::pair<uint64_t, uint64_t> EntryKey;
+  typedef boost::unordered_map<EntryKey, Entries::iterator> EntryKeys;
+
+  struct C_Fetch : public Context {
+    ObjectPlayerPtr object_player;
+    Context *on_finish;
+    bufferlist read_bl;
+    C_Fetch(ObjectPlayer *o, Context *ctx) : object_player(o), on_finish(ctx) {
+    }
+    void finish(int r) override;
+  };
+  struct C_WatchFetch : public Context {
+    ObjectPlayerPtr object_player;
+    C_WatchFetch(ObjectPlayer *o) : object_player(o) {
+    }
+    void finish(int r) override;
+  };
+
+  librados::IoCtx m_ioctx;
+  uint64_t m_object_num;
+  std::string m_oid;
+  CephContext *m_cct;
+
+  SafeTimer &m_timer;
+  Mutex &m_timer_lock;
+
+  uint8_t m_order;
+  uint64_t m_max_fetch_bytes;
+
+  double m_watch_interval;
+  Context *m_watch_task;
+
+  mutable Mutex m_lock;
+  bool m_fetch_in_progress;
+  bufferlist m_read_bl;
+  uint32_t m_read_off = 0;
+  uint32_t m_read_bl_off = 0;
+
+  Entries m_entries;
+  EntryKeys m_entry_keys;
+  InvalidRanges m_invalid_ranges;
+
+  Context *m_watch_ctx = nullptr;
+
+  bool m_unwatched = false;
+  RefetchState m_refetch_state = REFETCH_STATE_IMMEDIATE;
+
+  int handle_fetch_complete(int r, const bufferlist &bl, bool *refetch);
+
+  void clear_invalid_range(uint32_t off, uint32_t len);
+
+  void schedule_watch();
+  bool cancel_watch();
+  void handle_watch_task();
+  void handle_watch_fetched(int r);
+};
+
+} // namespace journal
+
+#endif // CEPH_JOURNAL_OBJECT_PLAYER_H