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UnboundedQueue.scala
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UnboundedQueue.scala
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/*
* SPDX-License-Identifier: Apache-2.0
* Copyright 2016-2024 Daniel Urban and contributors listed in NOTICE.txt
*
* 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 dev.tauri.choam
package async
import cats.effect.std.{ Queue => CatsQueue }
abstract class UnboundedQueue[F[_], A]
extends data.Queue[A]
with AsyncQueueSource[F, A]
object UnboundedQueue {
abstract class WithSize[F[_], A] extends UnboundedQueue[F, A] {
def size: F[Int]
def toCats: CatsQueue[F, A]
}
def apply[F[_], A](implicit F: AsyncReactive[F]): Axn[UnboundedQueue[F, A]] = {
data.Queue.unbounded[A].flatMapF { q =>
F.waitList[A](syncGet = q.tryDeque, syncSet = q.enqueue).map { wl =>
new UnboundedQueue[F, A] {
final override def tryEnqueue: A =#> Boolean =
this.enqueue.as(true)
final override def enqueue: A =#> Unit =
wl.set
final override def tryDeque: Axn[Option[A]] =
q.tryDeque
final override def deque[AA >: A]: F[AA] =
F.monad.widen(wl.asyncGet)
}
}
}
}
def withSize[F[_], A](implicit F: AsyncReactive[F]): Axn[UnboundedQueue.WithSize[F, A]] = {
data.Queue.unboundedWithSize[A].flatMapF { q =>
F.waitList[A](syncGet = q.tryDeque, syncSet = q.enqueue).map { wl =>
new UnboundedQueue.WithSize[F, A] {
final override def tryEnqueue: A =#> Boolean =
this.enqueue.as(true)
final override def enqueue: A =#> Unit =
wl.set
final override def tryDeque: Axn[Option[A]] =
q.tryDeque
final override def deque[AA >: A]: F[AA] =
F.monad.widen(wl.asyncGet)
final override def size: F[Int] =
q.size.run[F]
final override def toCats: CatsQueue[F, A] =
new AsyncQueue.CatsQueueAdapter(this)
}
}
}
}
}