Class: Pacer::Pipes::StreamSortPipe

Inherits:
RubyPipe
  • Object
show all
Defined in:
lib/pacer/pipe/stream_sort_pipe.rb

Overview

has 3 states:

  • starts in rebalancing mode to build up a working set which stores elements in 4 silos

  • if the first silo becomes empty, it goes into clearing mode

  • in clearing mode, it will empty all elements out of the first non-empty silo

  • it then goes back into rebalancing mode

Number of silos is 4 by default, a number I pulled out of my ass without any testing.

Instance Attribute Summary

Attributes inherited from RubyPipe

#starts

Instance Method Summary collapse

Methods inherited from RubyPipe

#enablePath, #reset, #setStarts

Constructor Details

#initialize(queue_length = 100, silo_size = 10) ⇒ StreamSortPipe

Returns a new instance of StreamSortPipe.



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# File 'lib/pacer/pipe/stream_sort_pipe.rb', line 11

def initialize(queue_length = 100, silo_size = 10)
  super()
  @queue_length = queue_length
  @rebalancing = []
  @rebal_length = 0
  @first_silo = []
  @second_silo = []
  @third_silo = []
  @clearing = []
  @silo_size = silo_size
end

Instance Method Details

#processNextStart ⇒ Object 



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# File 'lib/pacer/pipe/stream_sort_pipe.rb', line 27

def processNextStart
  if @clearing.any?
    return @clearing.shift
  end
  while @rebal_length < @queue_length and @starts.hasNext
    @rebalancing << @starts.next
    @rebal_length += 1
  end
  if @rebalancing.any?
    if @starts.hasNext
      @rebalancing.sort!
      @first_silo = @rebalancing.slice(0, @silo_size)
      @second_silo = @rebalancing.slice(@silo_size, @silo_size * 2) || []
      @third_silo = @rebalancing.slice(@silo_size * 2..-1) || []
      @rebalancing = []
    else
      @clearing = @rebalancing.sort
      @rebalancing = []
      return processNextStart
    end
  end
  if @starts.hasNext
    if @first_silo.any?
      element = @starts.next
      begin
        if element < @first_silo.last
          @first_silo << element
          @first_silo.sort!
        elsif @second_silo.none? or element < @second_silo.last
          @second_silo.unshift element
        else
          @third_silo << element
        end
      rescue => e
        @first_silo.unshift element
      end
      return @first_silo.shift
    else
      @clearing = @second_silo
      @clearing.sort!
      @rebalancing = @third_silo
      @rebal_length = @rebalancing.length
      return @rebalancing.shift
    end
  else
    @clearing = @first_silo + @second_silo.sort! + @third_silo.sort!
    return processNextStart if @clearing.any?
  end
  raise EmptyPipe.instance
end

#setSiloSize(n) ⇒ Object 



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# File 'lib/pacer/pipe/stream_sort_pipe.rb', line 23

def setSiloSize(n)
  @silo_size = n
end