Class: Innodb::Page::SysRsegHeader

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

Constant Summary

Constants inherited from Innodb::Page

PAGE_TYPE, PAGE_TYPE_BY_VALUE, SPECIALIZED_CLASSES

Instance Attribute Summary

Attributes inherited from Innodb::Page

#space

Instance Method Summary collapse

Methods inherited from Innodb::Page

#calculate_checksum, #checksum, #corrupt?, #cursor, #data, #fil_header, handle, #initialize, #inspect, #lsn, maybe_undefined, #next, #offset, parse, #pos_fil_header, #pos_fil_trailer, #pos_page_body, #prev, #size, #size_fil_header, #size_fil_trailer, #type

Constructor Details

This class inherits a constructor from Innodb::Page

Instance Method Details

#dump ⇒ Object 



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# File 'lib/innodb/page/sys_rseg_header.rb', line 47

def dump
  super

  puts
  puts "rollback segment header:"
  pp rseg_header

  puts
  puts "undo segment array:"
  each_undo_segment do |slot, page_number|
    puts "  #{slot}: #{page_number}"
  end
end

#each_undo_segment ⇒ Object 



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# File 'lib/innodb/page/sys_rseg_header.rb', line 32

def each_undo_segment
  unless block_given?
    return enum_for(:each_undo_segment)
  end

  cursor(pos_undo_segment_array).name("undo_segment_array") do |c|
    (0...1023).each do |slot|
      page_number = c.name("slot[#{slot}]") {
        Innodb::Page.maybe_undefined(c.get_uint32)
      }
      yield slot, page_number if page_number
    end
  end
end

#pos_rseg_header ⇒ Object

The position of the rollback segment header within the page.



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# File 'lib/innodb/page/sys_rseg_header.rb', line 5

def pos_rseg_header
  pos_fil_header + size_fil_header
end

#pos_undo_segment_array ⇒ Object 



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# File 'lib/innodb/page/sys_rseg_header.rb', line 14

def pos_undo_segment_array
  pos_rseg_header + size_rseg_header
end

#rseg_header ⇒ Object

Parse the rollback segment header from the page.



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

def rseg_header
  cursor(pos_rseg_header).name("rseg_header") do |c|
    {
      :max_size => c.name("max_size") { c.get_uint32 },
      :history_size => c.name("history_size") { c.get_uint32 },
      :history_list => c.name("history_list") {
        Innodb::List::History.new(@space, Innodb::List.get_base_node(c))
      },
      :fseg => c.name("fseg") { Innodb::FsegEntry.get_inode(@space, c) },
    }
  end
end

#size_rseg_header ⇒ Object

The size of the rollback segment header.



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# File 'lib/innodb/page/sys_rseg_header.rb', line 10

def size_rseg_header
  4 + 4 + Innodb::List::BASE_NODE_SIZE + Innodb::FsegEntry::SIZE
end