ceph/src/journal/Entry.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_JOURNAL_ENTRY_H
   5 #define CEPH_JOURNAL_ENTRY_H
   6
   7 #include "include/int_types.h"
   8 #include "include/buffer.h"
   9 #include "include/encoding.h"
  10 #include <iosfwd>
  11 #include <string>
  12
  13 namespace ceph {
  14 class Formatter;
  15 }
  16
  17 namespace journal {
  18
  19 class Entry {
  20 public:
  21   Entry() : m_tag_tid(0), m_entry_tid() {}
  22   Entry(uint64_t tag_tid, uint64_t entry_tid, const bufferlist &data)
  23     : m_tag_tid(tag_tid), m_entry_tid(entry_tid), m_data(data)
  24   {
  25   }
  26
  27   static uint32_t get_fixed_size();
  28
  29   inline uint64_t get_tag_tid() const {
  30     return m_tag_tid;
  31   }
  32   inline uint64_t get_entry_tid() const {
  33     return m_entry_tid;
  34   }
  35   inline const bufferlist &get_data() const {
  36     return m_data;
  37   }
  38
  39   void encode(bufferlist &bl) const;
  40   void decode(bufferlist::const_iterator &iter);
  41   void dump(ceph::Formatter *f) const;
  42
  43   bool operator==(const Entry& rhs) const;
  44
  45   static bool is_readable(bufferlist::const_iterator iter, uint32_t *bytes_needed);
  46   static void generate_test_instances(std::list<Entry *> &o);
  47
  48 private:
  49   static const uint64_t preamble = 0x3141592653589793;
  50
  51   uint64_t m_tag_tid;
  52   uint64_t m_entry_tid;
  53   bufferlist m_data;
  54 };
  55
  56 std::ostream &operator<<(std::ostream &os, const Entry &entry);
  57 WRITE_CLASS_ENCODER(journal::Entry)
  58
  59 } // namespace journal
  60
  61
  62 #endif // CEPH_JOURNAL_ENTRY_H