fs2.kafka.internal.Blocking.scala Maven / Gradle / Ivy
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/*
* Copyright 2018-2024 OVO Energy Limited
*
* SPDX-License-Identifier: Apache-2.0
*/
package fs2.kafka.internal
import java.util.concurrent.Executors
import scala.concurrent.ExecutionContext
import cats.effect.{Async, Resource, Sync}
import cats.effect.syntax.async.*
private[kafka] trait Blocking[F[_]] {
def apply[A](a: => A): F[A]
}
private[kafka] object Blocking {
def fromSync[F[_]: Sync]: Blocking[F] = new Blocking[F] {
override def apply[A](a: => A): F[A] = Sync[F].blocking(a)
}
def fromExecutionContext[F[_]](ec: ExecutionContext)(implicit F: Async[F]): Blocking[F] =
new Blocking[F] {
def apply[A](a: => A): F[A] = F.delay(a).evalOn(ec)
}
def singleThreaded[F[_]](name: String)(implicit F: Async[F]): Resource[F, Blocking[F]] =
Resource
.make(
F.delay(
Executors.newSingleThreadExecutor { (runnable: Runnable) =>
val thread = new Thread(runnable)
thread.setName(s"$name-${thread.getId}")
thread.setDaemon(true)
thread
}
)
)(ex => F.delay(ex.shutdown()))
.map(ex => fromExecutionContext(ExecutionContext.fromExecutor(ex)))
}