Class: CommunityTheatre::SplicingSpooler

Inherits:
DisposableSpooler show all
Defined in:
lib/community_theatre/splicing_spooler.rb

Instance Method Summary collapse

Methods inherited from DisposableSpooler

#unspool

Constructor Details

#initialize(dest, page_size: 100) ⇒ SplicingSpooler

Returns a new instance of SplicingSpooler.



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# File 'lib/community_theatre/splicing_spooler.rb', line 7

def initialize(dest, page_size: 100)
  super(dest, page_size: page_size)
end

Instance Method Details

#spool!(enumerable) ⇒ Object 



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# File 'lib/community_theatre/splicing_spooler.rb', line 11

def spool!(enumerable)
  pages = existing_pages
  # for convenience's sake, rebuild the last page now
  starting_page = [pages.size - 1, 0].max
  skip_number = starting_page * @page_size

  enumerable.seek_to!(skip_number, last_entry_of_second_last_page)

  enumerable.each_slice(@page_size).each_with_index do |page, index|
    file_for_page(index + starting_page) do |file|
      packer = MessagePack::Packer.new(file)
      packer.write_array_header(page.size)

      page.each { |item| packer.write(item) }

      packer.flush
    end
  end
end