Scala Serialization: Set x List x Vector x Seq x Array using Kryo and Java

serializationdemo.scala

import scala.collection.mutable

object C {
  case class CSet(s: Set[String])
  case class CLis(s: List[String])
  case class CVec(s: Vector[String])
  case class CSeq(s: Seq[String])
  case class CArr(s: Array[String])
}



object SerializationDemo extends App {
import C._

  def measureBytes(obj: AnyRef) = {

    def usingJava = {
      import java.io._
      val bout = new ByteArrayOutputStream()
      val out = new ObjectOutputStream(bout)
      out.writeObject(obj)
      out.close()
      bout.size()
    }
    def usingKryo() = {
      import com.twitter.chill.{KryoPool, ScalaKryoInstantiator}
      val instantiator = new ScalaKryoInstantiator
      KryoPool.withByteArrayOutputStream(1, instantiator).toBytesWithClass(obj).size
    }

    Map('kryo -> usingKryo(), 'java -> usingJava)

  }

  val s = (1 to 20).map(_.toString)

  println(s"Set: ${measureBytes(CSet(s.toSet))}")
  println(s"List: ${measureBytes(CLis(s.toList))}")
  println(s"Vector: ${measureBytes(CVec(s.toVector))}")
  println(s"Seq as List: ${measureBytes(CSeq(s.toList))}")
  println(s"Seq as ArraySeq: ${measureBytes(CSeq(mutable.ArraySeq.empty ++ s))}")
  println(s"Seq as WrappedArray: ${measureBytes(CSeq(mutable.WrappedArray.empty ++ s))}")
  println(s"Array: ${measureBytes(CArr(s.toArray))}")

  println(s"Empty Set: ${measureBytes(CSet(Set.empty))}")
  println(s"Empty List: ${measureBytes(CLis(List.empty))}")
  println(s"Empty Vector: ${measureBytes(CVec(Vector.empty))}")
  println(s"Empty Seq as List: ${measureBytes(CSeq(List.empty))}")
  println(s"Empty Seq as ArraySeq: ${measureBytes(CSeq(mutable.ArraySeq.empty))}")
  println(s"Empty Seq as WrappedArray: ${measureBytes(CSeq(mutable.WrappedArray.empty))}")
  println(s"Empty Array: ${measureBytes(CArr(Array.empty))}")
}

Output:

Set: Map('kryo -> 98, 'java -> 240)
List: Map('kryo -> 138, 'java -> 293)
Vector: Map('kryo -> 97, 'java -> 451)
Seq as list: Map('kryo -> 138, 'java -> 282)
Array: Map('kryo -> 77, 'java -> 190)
Empty Set: Map('kryo -> 58, 'java -> 129)
Empty List: Map('kryo -> 50, 'java -> 202)
Empty Vector: Map('kryo -> 17, 'java -> 309)
Empty Seq as list: Map('kryo -> 50, 'java -> 191)
Empty Array: Map('kryo -> 17, 'java -> 99)

Set: Map('kryo -> 92, 'java -> 234)
List: Map('kryo -> 132, 'java -> 287)
Vector: Map('kryo -> 91, 'java -> 445)
Seq as List: Map('kryo -> 132, 'java -> 276)
Seq as ArraySeq: Map('kryo -> 149, 'java -> 280)
Seq as WrappedArray: Map('kryo -> 141, 'java -> 444)
Array: Map('kryo -> 71, 'java -> 184)
Empty Set: Map('kryo -> 52, 'java -> 123)
Empty List: Map('kryo -> 44, 'java -> 196)
Empty Vector: Map('kryo -> 11, 'java -> 303)
Empty Seq as List: Map('kryo -> 44, 'java -> 185)
Empty Seq as ArraySeq: Map('kryo -> 69, 'java -> 189)
Empty Seq as WrappedArray: Map('kryo -> 98, 'java -> 782)
Empty Array: Map('kryo -> 11, 'java -> 93)