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abstract class AbsArray[T] {
def apply(idx: Int): T
def update(idx: Int, elem: T)
def length: Int
def applyByte(idx: Int): Byte = apply(idx).asInstanceOf[Byte]
def updateByte(idx: Int, elem: Byte) = update(idx, elem.asInstanceOf[T])
def applyChar(idx: Int): Char = apply(idx).asInstanceOf[Char]
def updateChar(idx: Int, elem: Char) = update(idx, elem.asInstanceOf[T])
def applyShort(idx: Int): Short = apply(idx).asInstanceOf[Short]
def updateShort(idx: Int, elem: Short) = update(idx, elem.asInstanceOf[T])
def applyInt(idx: Int): Int = apply(idx).asInstanceOf[Int]
def updateInt(idx: Int, elem: Int) = update(idx, elem.asInstanceOf[T])
def applyLong(idx: Int): Long = apply(idx).asInstanceOf[Long]
def updateLong(idx: Int, elem: Long) = update(idx, elem.asInstanceOf[T])
def applyFloat(idx: Int): Float = apply(idx).asInstanceOf[Float]
def updateFloat(idx: Int, elem: Float) = update(idx, elem.asInstanceOf[T])
def applyDouble(idx: Int): Double = apply(idx).asInstanceOf[Double]
def updateDouble(idx: Int, elem: Double) = update(idx, elem.asInstanceOf[T])
def applyBoolean(idx: Int): Boolean = apply(idx).asInstanceOf[Boolean]
def updateBoolean(idx: Int, elem: Boolean) = update(idx, elem.asInstanceOf[T])
def applyObject(idx: Int): Object = apply(idx).asInstanceOf[Object]
def updateObject(idx: Int, elem: Object) = update(idx, elem.asInstanceOf[T])
}
final class IntArray(arr: Array[Int]) extends AbsArray[Int] {
def apply(idx: Int): Int = applyInt(idx)
def update(idx: Int, elem: Int) = updateInt(idx, elem)
override def applyInt(idx: Int): Int = arr(idx)
override def updateInt(idx: Int, elem: Int) = arr(idx) = elem
def length: Int = arr.length
}
final class ArraySeq[T](arr: Array[T]) extends AbsArray[T] {
def apply(idx: Int): T = arr(idx)
def update(idx: Int, elem: T) = arr(idx) = elem
def length: Int = arr.length
}
class SpecArray[@specialized T](arr: Array[T]) extends AbsArray[T] {
def apply(idx: Int): T = arr(idx)
def update(idx: Int, elem: T) = arr(idx) = elem
def length: Int = arr.length
}
abstract class Test {
def sum(): Int
def modify(i: Int)
def run() {
var s = 0
for (i <- 1 to 1000000) {
s += sum()
modify(i)
}
println(s)
}
}
class ScalaSpecTest extends Test {
val arr = new IntArray(new Array[Int](1000))
def sum(): Int = {
var acc = 0
var i = 0
while (i < arr.length) { acc = acc + arr.applyInt(i); i += 1 }
acc
}
def modify(j: Int) = {
val base = j * 100 % 1000
var i = 0
while (i < 100) {
arr.updateInt(i + base, arr.applyInt(i + base) + 1)
i += 1
}
}
}
class ScalaSpec2Test extends Test {
val arr: AbsArray[Int] = new IntArray(new Array[Int](1000))
def sum(): Int = {
var acc = 0
var i = 0
while (i < arr.length) { acc = acc + arr.applyInt(i); i += 1 }
acc
}
def modify(j: Int) = {
val base = j * 100 % 1000
var i = 0
while (i < 100) {
arr.updateInt(i + base, arr.applyInt(i + base) + 1)
i += 1
}
}
}
class ScalaWrapTest extends Test {
val arr: AbsArray[Int] = new ArraySeq(new Array[Int](1000))
def sum(): Int = {
var acc = 0
var i = 0
while (i < arr.length) { acc = acc + arr.applyInt(i); i += 1 }
acc
}
def modify(j: Int) = {
val base = j * 100 % 1000
var i = 0
while (i < 100) {
arr.updateInt(i + base, arr.applyInt(i + base) + 1)
i += 1
}
}
}
class ScalaGenTest extends Test {
val arr: AbsArray[Integer] = new ArraySeq(new Array[Integer](1000))
for (i <- 0 until arr.length) arr(i) = new Integer(0)
def sum(): Int = {
var acc = 0
var i = 0
while (i < arr.length) { acc = acc + arr.apply(i).intValue; i += 1 }
acc
}
def modify(j: Int) = {
val base = j * 100 % 1000
var i = 0
while (i < 100) {
arr.update(i + base, new Integer(arr.apply(i + base).intValue + 1))
i += 1
}
}
}
class JavaTest extends Test {
val arr = new Array[Int](1000)
def sum(): Int = {
var acc = 0
var i = 0
while (i < arr.length) { acc = acc + arr(i); i += 1 }
acc
}
def modify(j: Int) = {
val base = j * 100 % 1000
var i = 0
while (i < 100) {
arr(i + base) += 1
i += 1
}
}
}
/** Specialized array test. */
class ScalaSpec3Test extends Test {
val arr: SpecArray[Int] = new SpecArray(new Array[Int](1000))
def sum(): Int = {
var acc = 0
var i = 0
while (i < arr.length) { acc = acc + arr(i); i += 1 }
acc
}
def modify(j: Int) = {
val base = j * 100 % 1000
var i = 0
while (i < 100) {
arr(i + base) = arr(i + base) + 1
i += 1
}
}
}
object TestRunner {
(new JavaTest).run()
(new ScalaSpecTest).run()
(new ScalaSpec2Test).run()
(new ScalaGenTest).run()
(new ScalaWrapTest).run()
(new ScalaSpec3Test).run()
}
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