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SchedulerCompanionPlatform.scala
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SchedulerCompanionPlatform.scala
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/*
* Copyright 2020-2022 Typelevel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cats.effect.unsafe
import scala.concurrent.duration._
import scala.scalajs.js
import scala.scalajs.js.timers
import scala.util.Try
private[unsafe] abstract class SchedulerCompanionPlatform { this: Scheduler.type =>
private[this] val maxTimeout = Int.MaxValue.millis
def createDefaultScheduler(): (Scheduler, () => Unit) =
(
new Scheduler {
def sleep(delay: FiniteDuration, task: Runnable): Runnable =
if (delay <= maxTimeout) {
val handle = timers.setTimeout(delay)(task.run())
() => timers.clearTimeout(handle)
} else {
var cancel: Runnable = () => ()
cancel = sleep(maxTimeout, () => cancel = sleep(delay - maxTimeout, task))
() => cancel.run()
}
def nowMillis() = System.currentTimeMillis()
def monotonicNanos() = System.nanoTime()
override def nowMicros(): Long = nowMicrosImpl()
},
() => ())
private[this] val nowMicrosImpl: () => Long = {
def test(performance: Performance) = {
// take it for a spin
!(performance.timeOrigin + performance.now()).isNaN
}
def browsers =
Try(js.Dynamic.global.performance.asInstanceOf[js.UndefOr[Performance]])
.toOption
.flatMap(_.toOption)
.filter(test)
def nodeJS =
Try(
js.Dynamic
.global
.require("perf_hooks")
.performance
.asInstanceOf[js.UndefOr[Performance]]).toOption.flatMap(_.toOption).filter(test)
browsers.orElse(nodeJS).map { performance => () =>
((performance.timeOrigin + performance.now()) * 1000).toLong
} getOrElse { () => System.currentTimeMillis() * 1000 }
}
}
@js.native
private trait Performance extends js.Any {
def timeOrigin: Double = js.native
def now(): Double = js.native
}