Contents

class Cassandra
  # A temporally-ordered UUID class for use in Cassandra column names
  class UUID < Comparable
    UINT = 2**32
    LONG = 2**64
    MAX = 2**128
    
    def initialize(bytes = nil)      
      case bytes
      when String
        raise TypeError, "16 bytes required" if bytes.size != 16
        @bytes = bytes
      when Integer
        raise TypeError, "Integer must be between 0 and 2**128" if bytes < 0 or bytes > MAX
        @bytes = [bytes / LONG, bytes % LONG].pack("QQ")
      when NilClass
        @bytes = [Time.stamp, Process.pid, rand(UINT)].pack("QII")
      else
        raise TypeError, "Can't convert from #{bytes.class}"
      end
    end
    
    def to_i
      @to_i ||= begin
        ints = @bytes.unpack("QQ")
        ints[0] * 2**64 + ints[1]        
      end
    end
    
    def inspect
      ints = @bytes.unpack("QII")
      "<Cassandra::UUID##{object_id} time: #{
          Time.at(ints[0] / 1_000_000).inspect
        }, usecs: #{
          ints[0] % 1_000_000
        }, pid: #{
          ints[1]
        }, jitter: #{
          ints[2]
        }>"
    end      
  end  
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
cassandra-0.4	lib/cassandra/uuid.rb