Comments (3)
Hi!
The quick reply is:
Here is a code which moves the data from DataEvent
to a DataState
https://github.com/KStateMachine/kstatemachine/blob/master/kstatemachine/src/commonMain/kotlin/ru/nsk/kstatemachine/state/DefaultDataState.kt#L32
It is triggered in a moment of DataState
activation.
In a sample that you have provided, the DataState
contains initialChoiceState
. This means that DataState
is never activated. The ChoiceState
is calculated before state activation, and the StateMachine
goes directly to resulting state.
Imagine there are many ChoiceState
redirections one by one. The library calculates resulting state path passing through all of ChoiceStates
and activates states only on the last resulting destination (path). All intermediate state paths that were calculated during redirections are not activated. So it looks that you cannot access data from DateState
in such case and butter to look directly into Event
property.
The long reply:
I have to check this in runtime, this will take a while)
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But even if I do another problem occures. I then get the following exception:
java.lang.IllegalStateException: Last data is not available yet in MyDataState($38827186), and default data not provided.
I can not say why this happens, the code sample is provided for another case. You can provide another sample for this case, so I can see where the data is read from the DataState
. Maybe If you read the data from Event
there is no need to read it from the DataState
? (and even use DataState
api)
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Based in your first explanation I think the second problem seems to correlate. Both problems say that the data is not set even tough the state should be active. In the first case I activly try to get the data and run into an exception. In the second the statemachone itself seems to detect that there ist no data when transition into the state.
The code sample for this is pretty similar.
object MyDataState : DefaultDataState<Data>
addState(MyDataState) {
initialChoiceState {
if(true) {
State1
}
else {
State2
}
}
}
Just dont use the Data in the code sample and make something like this (Code makes no sense but should trigger the problem, not at home to test this but pretty sure that was it).
I belive what happens ist that the state ist still triggered after the choice state but without the data event? Not really sure about that.
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Related Issues (20)
- onEntry with Transition or Conditional Transition without Event HOT 5
- Update Data of a DataState HOT 4
- data transition should no be self targeted, use simple transition instead HOT 2
- please add choiceDataState method HOT 3
- java.lang.IllegalArgumentException: Cannot set current state in child mode PARALLEL HOT 1
- State machine and Android lifecycle HOT 6
- Export to PlantUml: GuardedTransitionOnBuilder are not drawn in diagram HOT 4
- Sources are not packaged correctly HOT 2
- app crash when sending multiple events at once(through for loop) HOT 11
- Versions HOT 3
- State, transition names HOT 10
- Getting crash if I try to use `machine.startBlocking` from machine created with `createStdLibStateMachine` HOT 3
- Support wasmJs HOT 6
- Clarification of concurrency HOT 5
- Event queue is not empty, internal error HOT 5
- Need explanation for choice states HOT 3
- Data validation and transformation via events or state HOT 4
- How to do parallel data states? HOT 2
- Implement Intellij visualisation plugin
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