zio.http.endpoint.internal.MemoizedZIO.scala Maven / Gradle / Ivy
/*
* Copyright 2021 - 2023 Sporta Technologies PVT LTD & the ZIO HTTP contributors.
*
* 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 zio.http.endpoint.internal
import zio._
import zio.stacktracer.TracingImplicits.disableAutoTrace
private[http] class MemoizedZIO[K, E, A] private (compute: K => IO[E, A]) { self =>
private val mapRef: Ref[Map[K, Promise[E, A]]] = Ref.unsafe.make(Map[K, Promise[E, A]]())(Unsafe.unsafe)
def get(k: K)(implicit trace: Trace): IO[E, A] = {
ZIO.fiberIdWith { fiberId =>
for {
effect <- mapRef.modify[IO[E, A]] { map =>
map.get(k) match {
case Some(promise) => (promise.await, map)
case None =>
val promise = Promise.unsafe.make[E, A](fiberId)(Unsafe.unsafe)
(compute(k).exit.tap(exit => promise.done(exit)).flatten, map + (k -> promise))
}
}
result <- effect
} yield result
}
}
}
private[http] object MemoizedZIO {
def apply[K, E, A](compute: K => IO[E, A]): MemoizedZIO[K, E, A] = new MemoizedZIO(compute)
}