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StreamMetadataAccumulator.scala
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StreamMetadataAccumulator.scala
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/*
* Copyright 2022 Valdemar Grange
*
* 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 gql.interpreter
import cats.effect._
import cats.implicits._
import fs2.Stream
trait StreamMetadataAccumulator[F[_], A, B] {
def add(context: A, stream: Stream[F, B]): F[(Unique.Token, Either[Throwable, B])]
def getState: F[Map[Unique.Token, A]]
}
object StreamMetadataAccumulator {
def apply[F[_], A, B](implicit streamSup: StreamSupervisor[F, B], F: Concurrent[F]) =
F.ref(Map.empty[Unique.Token, A]).map { state =>
new StreamMetadataAccumulator[F, A, B] {
override def add(context: A, stream: Stream[F, B]): F[(Unique.Token, Either[Throwable, B])] =
streamSup
.acquireAwait(stream)
.flatTap { case (token, _) => state.update(_ + (token -> context)) }
override def getState: F[Map[Unique.Token, A]] = state.get
}
}
}