korolev.state.StateManager.scala Maven / Gradle / Ivy
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/*
* Copyright 2017-2018 Aleksey Fomkin
*
* 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 korolev.state
import korolev.Async
import levsha.Id
abstract class StateManager[F[_]: Async, S] { self =>
def default: S
def snapshot: F[StateManager.Snapshot]
def read[T: StateDeserializer](nodeId: Id): F[Option[T]]
def delete(nodeId: Id): F[Unit]
def write[T: StateSerializer](nodeId: Id, value: T): F[Unit]
def withDefault[B](newDefault: B): StateManager[F, B] = new StateManager[F, B] {
val default: B = newDefault
def snapshot: F[StateManager.Snapshot] = self.snapshot
def read[T: StateDeserializer](nodeId: Id): F[Option[T]] = self.read(nodeId)
def delete(nodeId: Id): F[Unit] = self.delete(nodeId)
def write[T: StateSerializer](nodeId: Id, value: T): F[Unit] = self.write(nodeId, value)
}
}
object StateManager {
@deprecated("Use korolev.Transition", "0.6.0")
type Transition[State] = State => State
trait Snapshot {
def apply[T: StateDeserializer](nodeId: Id): Option[T]
}
}