var inherits              = require('util').inherits
    , Readable              = require('stream').Readable
    , ReadableAsyncKit      = require('./lib/readable_asynckit.js')
    , ReadableParallel      = require('./lib/readable_parallel.js')
    , ReadableSerial        = require('./lib/readable_serial.js')
    , ReadableSerialOrdered = require('./lib/readable_serial_ordered.js')
    ;
  
  // API
  module.exports =
  {
    parallel      : ReadableParallel,
    serial        : ReadableSerial,
    serialOrdered : ReadableSerialOrdered, 
  };
  
  inherits(ReadableAsyncKit, Readable);
  
  inherits(ReadableParallel, ReadableAsyncKit);
  inherits(ReadableSerial, ReadableAsyncKit);
  inherits(ReadableSerialOrdered, ReadableAsyncKit);