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Use ThreadLocals to cache DecimalFormat instances

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This commit is contained in:
Ilya Gorbunov
2019-06-03 18:29:51 +03:00
parent 368452748b
commit 04ec90164e
1 changed files with 5 additions and 4 deletions
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libraries/stdlib/jvm/src/kotlin/time/formatToDecimals.kt
+5 -4
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@@ -9,9 +9,10 @@ import java.math.RoundingMode
import java.text.DecimalFormat
import java.text.DecimalFormatSymbols
import java.util.*
import kotlin.concurrent.getOrSet
private val rootFormatSymbols = DecimalFormatSymbols(Locale.ROOT).apply { exponentSeparator = "e" }
private val precisionFormats = Array<DecimalFormat?>(4) { null }
private val precisionFormats = Array(4) { ThreadLocal<DecimalFormat>() }
private fun createFormatForDecimals(decimals: Int) = DecimalFormat("0", rootFormatSymbols).apply {
if (decimals > 0) minimumFractionDigits = decimals
@@ -20,7 +21,7 @@ private fun createFormatForDecimals(decimals: Int) = DecimalFormat("0", rootForm
internal actual fun formatToExactDecimals(value: Double, decimals: Int): String {
val format = if (decimals < precisionFormats.size) {
precisionFormats[decimals] ?: createFormatForDecimals(decimals).also { precisionFormats[decimals] = it }
precisionFormats[decimals].getOrSet { createFormatForDecimals(decimals) }
} else
createFormatForDecimals(decimals)
return format.format(value)
@@ -31,6 +32,6 @@ internal actual fun formatUpToDecimals(value: Double, decimals: Int): String =
.apply { maximumFractionDigits = decimals }
.format(value)
private val scientificFormat = DecimalFormat("0E0", rootFormatSymbols).apply { maximumFractionDigits = 2 }
private val scientificFormat = ThreadLocal<DecimalFormat>()
internal actual fun formatScientific(value: Double): String =
scientificFormat.format(value)
scientificFormat.getOrSet { DecimalFormat("0E0", rootFormatSymbols).apply { maximumFractionDigits = 2 } }.format(value)