object ChangeEventHandler
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- def apply[Command, State, ChangeEvent](updateHandler: (State, State, Command) => ChangeEvent, deleteHandler: (State, Command) => ChangeEvent): ChangeEventHandler[Command, State, ChangeEvent]
Define these handlers in the DurableStateBehavior#withChangeEventHandler to store additional change event when the state is updated.
Define these handlers in the DurableStateBehavior#withChangeEventHandler to store additional change event when the state is updated. The event can be used in Projections.
The
updateHandleranddeleteHandlerare invoked after the ordinary command handler. Be aware of that if the state is mutable and modified by the command handler the previous state parameter of theupdateHandlerwill also include the modification, since it's the same instance. If that is a problem you need to use immutable state and create a new state instance when modifying it in the command handler.- updateHandler
Function that given the previous and new state creates the change event to be stored when the DurableState is updated.
- deleteHandler
Function that given the previous state creates the change event to be stored when the DurableState is deleted.
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