internal.ReusableLatch.scala Maven / Gradle / Ivy
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/*
* Copyright 2021 Hossein Naderi
*
* 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 lepus.client.internal
import cats.effect.Concurrent
import cats.effect.kernel.Deferred
import cats.effect.kernel.Ref
import cats.implicits.*
private[client] final class ReusableLatch[F[_]](r: Ref[F, Deferred[F, Unit]])(
using F: Concurrent[F]
) {
def run[T](f: F[T]): F[T] = r.get.flatMap(_.get) >> f
def block: F[Unit] = Deferred[F, Unit].flatMap(r.set)
def unblock: F[Unit] = r.get.flatMap(_.complete(()).void)
}
private[client] object ReusableLatch {
def apply[F[_]: Concurrent]: F[ReusableLatch[F]] = for {
d <- Deferred[F, Unit].flatTap(_.complete(()))
r <- Ref.of(d)
} yield new ReusableLatch(r)
}