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/* NEST (New Scala Test)
* Copyright 2007-2010 LAMP/EPFL
* @author Philipp Haller
*/
package scala.tools
package partest
import scala.collection.mutable.HashMap
trait Statistics {
/** Only collected when --stats is given. */
lazy val testStatistics = new HashMap[String, Long]
/** Given function and block of code, evaluates code block,
* calls function with milliseconds elapsed, and returns block result.
*/
def timed[T](f: Long => Unit)(body: => T): T = {
val start = System.currentTimeMillis
val result = body
val end = System.currentTimeMillis
f(end - start)
result
}
/** Times body and returns both values.
*/
def timed2[T](body: => T): (Long, T) = {
var milliSeconds = 0L
val result = timed(x => milliSeconds = x)(body)
(milliSeconds, result)
}
def resultsToStatistics(results: Iterable[(_, Int)]): (Int, Int) =
(results partition (_._2 == 0)) match {
case (winners, losers) => (winners.size, losers.size)
}
def recordTestTiming(name: String, milliseconds: Long) =
synchronized { testStatistics(name) = milliseconds }
def showTestStatistics() {
testStatistics.toList sortBy (-_._2) foreach { case (k, v) => println("%s: %.2f seconds".format(k, (v.toDouble / 1000))) }
}
}
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