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OutboxConsumer.scala
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OutboxConsumer.scala
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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 edomata.backend
import cats.Monad
import cats.data.NonEmptyChain
import cats.implicits.*
import edomata.backend.OutboxItem
import fs2.Stream
import fs2.Stream.*
object OutboxConsumer {
def apply[F[_], S, E, R, N](
backend: eventsourcing.Backend[F, S, E, R, N]
)(
run: edomata.backend.OutboxItem[N] => F[Unit]
)(using F: Monad[F]): Stream[F, Nothing] =
from(backend.outbox, backend.updates.outbox)(run)
def apply[F[_], S, N, R](
backend: cqrs.Backend[F, S, R, N]
)(
run: edomata.backend.OutboxItem[N] => F[Unit]
)(using F: Monad[F]): Stream[F, Nothing] =
from(backend.outbox, backend.updates.outbox)(run)
def from[F[_], S, N, R](
backend: OutboxReader[F, N],
signal: Stream[F, Unit]
)(
run: OutboxItem[N] => F[Unit]
)(using F: Monad[F]): Stream[F, Nothing] =
(emit(()) ++ signal)
.flatMap(_ => backend.read)
.chunks
.foreach(ch =>
NonEmptyChain
.fromChain(ch.toChain)
.fold(F.unit)(
ch.traverse(run) >> backend.markAllAsSent(_)
)
)
}