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/*
* Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package benchmarks.flow.scrabble
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.*
import org.openjdk.jmh.annotations.*
import java.lang.Long.*
import java.util.*
import java.util.concurrent.*
@Warmup(iterations = 7, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 7, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(value = 1)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
open class SequencePlaysScrabble : ShakespearePlaysScrabble() {
@Benchmark
public override fun play(): List<Map.Entry<Int, List<String>>> {
val score2: (String) -> Int = { word: String ->
buildHistogram(word)
.map { it.letterScore() }
.sum()
}
val bonusForDoubleLetter: (String) -> Int = { word: String ->
toBeMaxed(word)
.map { letterScores[it - 'a'.toInt()] }
.max()!!
}
val score3: (String) -> Int = { word: String ->
val sum = score2(word) + bonusForDoubleLetter(word)
sum * 2 + if (word.length == 7) 50 else 0
}
val buildHistoOnScore: (((String) -> Int) -> Flow<TreeMap<Int, List<String>>>) = { score ->
flow {
emit(shakespeareWords.asSequence()
.filter({ scrabbleWords.contains(it) && checkBlanks(it) })
.fold(TreeMap<Int, List<String>>(Collections.reverseOrder())) { acc, value ->
val key = score(value)
var list = acc[key] as MutableList<String>?
if (list == null) {
list = ArrayList()
acc[key] = list
}
list.add(value)
acc
})
}
}
return runBlocking {
buildHistoOnScore(score3)
.flatMapConcatIterable { it.entries }
.take(3)
.toList()
}
}
private fun Map.Entry<Int, MutableLong>.letterScore(): Int = letterScores[key - 'a'.toInt()] * Integer.min(
value.get().toInt(),
scrabbleAvailableLetters[key - 'a'.toInt()])
private fun toBeMaxed(word: String) = word.asSequence(startIndex = 3) + word.asSequence(endIndex = 3)
private fun checkBlanks(word: String) = numBlanks(word) <= 2L
private fun numBlanks(word: String): Long {
return buildHistogram(word)
.map { blanks(it) }
.sum()
}
private fun blanks(entry: Map.Entry<Int, MutableLong>): Long =
max(0L, entry.value.get() - scrabbleAvailableLetters[entry.key - 'a'.toInt()])
private fun buildHistogram(word: String): HashMap<Int, MutableLong> {
return word.asSequence().fold(HashMap()) { accumulator, value ->
var newValue: MutableLong? = accumulator[value]
if (newValue == null) {
newValue = MutableLong()
accumulator[value] = newValue
}
newValue.incAndSet()
accumulator
}
}
private fun String.asSequence(startIndex: Int = 0, endIndex: Int = length) = object : Sequence<Int> {
override fun iterator(): Iterator<Int> = object : Iterator<Int> {
private val _endIndex = endIndex.coerceAtMost(length)
private var currentIndex = startIndex
override fun hasNext(): Boolean = currentIndex < _endIndex
override fun next(): Int = get(currentIndex++).toInt()
}
}
}
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