Class: Innodb::Page::SysDataDictionaryHeader

Inherits:
Innodb::Page show all
Defined in:
lib/innodb/page/sys_data_dictionary_header.rb

Defined Under Namespace

Classes: Header

Constant Summary

Constants inherited from Innodb::Page

PAGE_TYPE, PAGE_TYPE_BY_VALUE, UNDEFINED_PAGE_NUMBER

Instance Attribute Summary

Attributes inherited from Innodb::Page

#space

Instance Method Summary collapse

Methods inherited from Innodb::Page

#checksum_crc32, #checksum_crc32?, #checksum_innodb, #checksum_innodb?, #checksum_invalid?, #checksum_type, #checksum_valid?, #corrupt?, #cursor, #default_page_size?, #each_page_body_byte_as_uint8, #each_page_header_byte_as_uint8, #extent_descriptor?, #fil_header, #fil_trailer, handle, #in_doublewrite_buffer?, #initialize, #inspect, #inspect_header_fields, maybe_undefined, #misplaced?, #misplaced_offset?, #misplaced_space?, #name, parse, #pos_fil_header, #pos_fil_trailer, #pos_page_body, #pos_partial_page_header, register_specialization, #size, #size_fil_header, #size_fil_trailer, #size_page_body, #size_partial_page_header, specialization_for, specialization_for?, #torn?, undefined?

Constructor Details

This class inherits a constructor from Innodb::Page

Instance Method Details

#data_dictionary_header ⇒ Object

Parse the data dictionary header from the page.



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 29

def data_dictionary_header
  cursor(pos_data_dictionary_header).name("data_dictionary_header") do |c|
    Header.new(
      max_row_id: c.name("max_row_id") { c.read_uint64 },
      max_table_id: c.name("max_table_id") { c.read_uint64 },
      max_index_id: c.name("max_index_id") { c.read_uint64 },
      max_space_id: c.name("max_space_id") { c.read_uint32 },
      unused_mix_id_low: c.name("unused_mix_id_low") { c.read_uint32 },
      indexes: c.name("indexes") do
        {
          SYS_TABLES: c.name("SYS_TABLES") do
            {
              PRIMARY: c.name("PRIMARY") { c.read_uint32 },
              ID: c.name("ID") { c.read_uint32 },
            }
          end,
          SYS_COLUMNS: c.name("SYS_COLUMNS") do
            {
              PRIMARY: c.name("PRIMARY") { c.read_uint32 },
            }
          end,
          SYS_INDEXES: c.name("SYS_INDEXES") do
            {
              PRIMARY: c.name("PRIMARY") { c.read_uint32 },
            }
          end,
          SYS_FIELDS: c.name("SYS_FIELDS") do
            {
              PRIMARY: c.name("PRIMARY") { c.read_uint32 },
            }
          end,
        }
      end,
      unused_space: c.name("unused_space") { c.read_bytes(4) },
      fseg: c.name("fseg") { Innodb::FsegEntry.get_inode(@space, c) }
    )
  end
end

#dump ⇒ Object 



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 83

def dump
  super

  puts
  puts "data_dictionary header:"
  pp data_dictionary_header
end

#each_region {|Region.new( offset: pos_data_dictionary_header, length: size_data_dictionary_header, name: :data_dictionary_header, info: "Data Dictionary Header" )| ... } ⇒ Object

Yields:



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 68

def each_region(&block)
  return enum_for(:each_region) unless block_given?

  super(&block)

  yield Region.new(
    offset: pos_data_dictionary_header,
    length: size_data_dictionary_header,
    name: :data_dictionary_header,
    info: "Data Dictionary Header"
  )

  nil
end

#pos_data_dictionary_header ⇒ Object

The position of the data dictionary header within the page.



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 19

def pos_data_dictionary_header
  pos_page_body
end

#size_data_dictionary_header ⇒ Object

The size of the data dictionary header.



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# File 'lib/innodb/page/sys_data_dictionary_header.rb', line 24

def size_data_dictionary_header
  ((8 * 3) + (4 * 7) + 4 + Innodb::FsegEntry::SIZE)
end