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Make TimeMark returned by TimeSource.Monotonic a value class

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This value class wraps Long on JVM and Native thus reducing allocations
in time measurement scenarios when the default monotonic time source is
statically known.

KT-46132
This commit is contained in:
Ilya Gorbunov
2022-01-25 00:47:21 +03:00
committed by Space
parent 5b45ea9bc9
commit fede70d0d5
11 changed files with 281 additions and 49 deletions
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libraries/stdlib/js/src/kotlin/time/MonoTimeSource.kt
+47 -13
View File
@@ -7,12 +7,23 @@ package kotlin.time
import org.w3c.performance.GlobalPerformance
import org.w3c.performance.Performance
import kotlin.time.Duration.Companion.milliseconds
@Suppress("ACTUAL_WITHOUT_EXPECT") // visibility
internal actual typealias DefaultTimeMarkReading = Any
@ExperimentalTime
internal interface DefaultTimeSource : TimeSource {
override fun markNow(): DefaultTimeMark
fun elapsedFrom(timeMark: DefaultTimeMark): Duration
fun adjustReading(timeMark: DefaultTimeMark, duration: Duration): DefaultTimeMark
}
@SinceKotlin("1.3")
@ExperimentalTime
internal actual object MonotonicTimeSource : TimeSource {
internal actual object MonotonicTimeSource : DefaultTimeSource, TimeSource { // TODO: interface should not be required here
private val actualSource: TimeSource = run {
private val actualSource: DefaultTimeSource = run {
val isNode: Boolean = js("typeof process !== 'undefined' && process.versions && !!process.versions.node")
if (isNode)
@@ -23,7 +34,10 @@ internal actual object MonotonicTimeSource : TimeSource {
}
override fun markNow(): TimeMark = actualSource.markNow()
actual override fun markNow(): DefaultTimeMark = actualSource.markNow()
actual override fun elapsedFrom(timeMark: DefaultTimeMark): Duration = actualSource.elapsedFrom(timeMark)
actual override fun adjustReading(timeMark: DefaultTimeMark, duration: Duration): DefaultTimeMark =
actualSource.adjustReading(timeMark, duration)
}
internal external interface Process {
@@ -32,27 +46,47 @@ internal external interface Process {
@SinceKotlin("1.3")
@ExperimentalTime
internal class HrTimeSource(val process: Process) : TimeSource {
internal class HrTimeSource(private val process: Process) : DefaultTimeSource {
override fun markNow(): DefaultTimeMark = DefaultTimeMark(process.hrtime())
override fun elapsedFrom(timeMark: DefaultTimeMark): Duration =
@Suppress("UNCHECKED_CAST")
process.hrtime(timeMark.reading as Array<Double>).let { (seconds, nanos) -> seconds.toDuration(DurationUnit.SECONDS) + nanos.toDuration(DurationUnit.NANOSECONDS) }
override fun adjustReading(timeMark: DefaultTimeMark, duration: Duration): DefaultTimeMark =
@Suppress("UNCHECKED_CAST")
(timeMark.reading as Array<Double>).let { (seconds, nanos) ->
duration.toComponents { addSeconds, addNanos ->
arrayOf<Double>(seconds + addSeconds, nanos + addNanos)
}
}.let(::DefaultTimeMark)
override fun markNow(): TimeMark = object : TimeMark() {
val startedAt = process.hrtime()
override fun elapsedNow(): Duration =
process.hrtime(startedAt).let { (seconds, nanos) -> seconds.toDuration(DurationUnit.SECONDS) + nanos.toDuration(DurationUnit.NANOSECONDS) }
}
override fun toString(): String = "TimeSource(process.hrtime())"
}
@SinceKotlin("1.3")
@ExperimentalTime
internal class PerformanceTimeSource(val performance: Performance) : AbstractDoubleTimeSource(unit = DurationUnit.MILLISECONDS) {
override fun read(): Double = performance.now()
internal class PerformanceTimeSource(val performance: Performance) : DefaultTimeSource { // AbstractDoubleTimeSource(unit = DurationUnit.MILLISECONDS) {
private fun read(): Double = performance.now()
override fun markNow(): DefaultTimeMark = DefaultTimeMark(read())
override fun elapsedFrom(timeMark: DefaultTimeMark): Duration = (read() - timeMark.reading as Double).milliseconds
override fun adjustReading(timeMark: DefaultTimeMark, duration: Duration): DefaultTimeMark =
DefaultTimeMark(timeMark.reading as Double + duration.toDouble(DurationUnit.MILLISECONDS))
override fun toString(): String = "TimeSource(self.performance.now())"
}
@SinceKotlin("1.3")
@ExperimentalTime
internal object DateNowTimeSource : AbstractDoubleTimeSource(unit = DurationUnit.MILLISECONDS) {
override fun read(): Double = kotlin.js.Date.now()
internal object DateNowTimeSource : DefaultTimeSource {
private fun read(): Double = kotlin.js.Date.now()
override fun markNow(): DefaultTimeMark = DefaultTimeMark(read())
override fun elapsedFrom(timeMark: DefaultTimeMark): Duration = (read() - timeMark.reading as Double).milliseconds
override fun adjustReading(timeMark: DefaultTimeMark, duration: Duration): DefaultTimeMark =
DefaultTimeMark(timeMark.reading as Double + duration.toDouble(DurationUnit.MILLISECONDS))
override fun toString(): String = "TimeSource(Date.now())"
}