Class: Fairy::PGroupBy::DirectKB2MergeSortBuffer::CachedBuffer

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/fairy/node/p-group-by.rb

Instance Method Summary collapse

Constructor Details

#initialize(njob, io) ⇒ CachedBuffer

Returns a new instance of CachedBuffer.



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# File 'lib/fairy/node/p-group-by.rb', line 1469

def initialize(njob, io)
  @njob = njob
  @io = io
  io.open

  @cache = []

  @eof = false

  read_buffer
  @key = @njob.hash_key(@cache.first.first)
end

Instance Method Details

#each_by_same_key(&block) ⇒ Object 



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# File 'lib/fairy/node/p-group-by.rb', line 1494

def each_by_same_key(&block)
  loop do
    while vv = @cache.shift
      unless @njob.hash_key(vv.first) == @key
	@cache.unshift vv
	@key = @njob.hash_key(vv.first)
	return
      end
      vv.each &block
    end
    read_buffer
    return if @cache.empty?
    unless @njob.hash_key(@cache.first.first) == @key
      @key = @njob.hash_key(@cache.first.first)
      return
    end
  end
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fairy/node/p-group-by.rb', line 1486

def eof?
  @eof
end

#key ⇒ Object 



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# File 'lib/fairy/node/p-group-by.rb', line 1490

def key
  @key
end

#read_buffer ⇒ Object 



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# File 'lib/fairy/node/p-group-by.rb', line 1513

def read_buffer
  io = @io.io
  begin
    @cache = Marshal.load(io)
  rescue EOFError
    @eof = true
    @cache = []
  rescue ArgumentError
    Log::debug(self, "MARSHAL ERROR OCCURED!!")
    io.seek(-1024, IO::SEEK_CUR)
    buf = io.read(2048)
    Log::debugf(self, "File Contents: %s", buf)
    raise
  end
end