Remove MultiMap (#6988)

docs/Changelog.md

@@ -64,6 +64,7 @@
 * [#6952](https://github.com/TouK/nussknacker/pull/6952) Improvement: TypeInformation support for scala.Option
 * [#6840](https://github.com/TouK/nussknacker/pull/6840) Introduce canCastTo, castTo and castToOrNull extension methods in SpeL.
 * [#6974](https://github.com/TouK/nussknacker/pull/6974) Add SpeL suggestions for cast methods parameter.
+* [#6988](https://github.com/TouK/nussknacker/pull/6988) Remove unused API classes: `MultiMap`, `TimestampedEvictableStateFunction`
 
 ## 1.17
 

docs/MigrationGuide.md

@@ -9,11 +9,13 @@ To see the biggest differences please consult the [changelog](Changelog.md).
 * [#6695](https://github.com/TouK/nussknacker/pull/6695) `SingleTypingResult` API changes:
   * Added `typeHintsObjType` which is used as a type for a type hints, suggester and validation.
   * Renamed `objType` to `runtimeObjType` which indicates a current object in a runtime.
-
 * [#6766](https://github.com/TouK/nussknacker/pull/6766)
   * Process API changes:
      * Field `ScenarioWithDetails.labels` was added
      * Field `ScenarioWithDetails.tags` was removed (it had the same value as `labels` and was not used)
+* [#6988](https://github.com/TouK/nussknacker/pull/6988) Removed unused API classes: `MultiMap`, `TimestampedEvictableStateFunction`.
+  `MultiMap` was incorrectly handled by Flink's default Kryo serializer, so if you want to copy it to your code
+  you should write and register a proper serializer.
 
 ### REST API changes
 

engine/flink/components-utils/src/main/scala/pl/touk/nussknacker/engine/flink/api/state/EvictableState.scala

@@ -47,20 +47,6 @@ abstract class EvictableStateFunction[In, Out, StateType] extends KeyedProcessFu
 
 }
 
-abstract class TimestampedEvictableStateFunction[In, Out, StateType]
-    extends EvictableStateFunction[In, Out, MultiMap[Long, StateType]] {
-
-  override protected def moveEvictionTime(offset: Long, ctx: KeyedProcessFunction[String, In, Out]#Context): Unit = {
-    super.moveEvictionTime(offset, ctx)
-    state.update(stateValue.from(ctx.timestamp() - offset))
-  }
-
-  protected def stateValue: MultiMap[Long, StateType] = {
-    Option(state.value()).getOrElse(MultiMap[Long, StateType](Ordering.Long))
-  }
-
-}
-
 abstract class LatelyEvictableStateFunction[In, Out, StateType]
     extends KeyedProcessFunction[String, In, Out]
     with LatelyEvictableStateFunctionMixin[StateType] {