WriteBufferTest

WriteBufferTest.scala

import java.io.ByteArrayOutputStream
import java.io.OutputStreamWriter

object WriteBufferTest {
  
  def writeData(appendable: java.lang.Appendable) {
    var i = 0
    while (i < 1000) {
      appendable.append("hello there ").append(i.toString())
      i += 1
    }
  }
  
  def time[T](count: Int)(f: => T): Long = {
    val start = System.nanoTime
    var i = 0
    while (i < count) {
      val r = f
      i +=1
    }
    ((System.nanoTime - start))
  }
  
  def main(args: Array[String]) {
    val loopCount = 10000
    println(time(loopCount)({
      outputStreamWrite
    }))
    println(time(loopCount)({
      stringBuilderWrite
    }))
    
    println(time(loopCount)({
      outputStreamWrite
    }))
    println(time(loopCount)({
      stringBuilderWrite
    }))
  }
  
  private def outputStreamWrite: Array[Byte] = {
    val baos = new ByteArrayOutputStream(4096)
    val osw = new OutputStreamWriter(baos, "UTF-8")
    writeData(osw)
    baos.toByteArray()
  }
  
  private def stringBuilderWrite: java.lang.String = {
    val builder = new java.lang.StringBuilder
    writeData(builder)
    builder.toString
  }
}