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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.FiniteDuration
import java.time.Instant
import java.time.temporal.ChronoField
import java.util.concurrent.{Executors, ScheduledExecutorService}
private[unsafe] abstract class SchedulerCompanionPlatform { this: Scheduler.type =>
def createDefaultScheduler(): (Scheduler, () => Unit) = {
val scheduler = Executors.newSingleThreadScheduledExecutor { r =>
val t = new Thread(r)
t.setName("io-scheduler")
t.setDaemon(true)
t.setPriority(Thread.MAX_PRIORITY)
t
}
(Scheduler.fromScheduledExecutor(scheduler), { () => scheduler.shutdown() })
}
def fromScheduledExecutor(scheduler: ScheduledExecutorService): Scheduler =
new Scheduler {
def sleep(delay: FiniteDuration, task: Runnable): Runnable = {
val future = scheduler.schedule(task, delay.length, delay.unit)
{ () =>
future.cancel(false)
()
}
}
def nowMillis() = System.currentTimeMillis()
override def nowMicros(): Long = {
val now = Instant.now()
now.getEpochSecond * 1000000 + now.getLong(ChronoField.MICRO_OF_SECOND)
}
def monotonicNanos() = System.nanoTime()
}
}