class Batches

# File lib/batches.rb, line 6
def self.do(cocurrence, entities, &block)
  raise NoBlockError, "No block given" if block.nil?
  entities.each_slice(cocurrence).map do |group|
    threads = group.map do |entity|
      Thread.new(entity){|e| block.call(e) }
    end
    threads.map{|t| t.value }
  end.flatten(1)
end