Illia Kovalov ikovalyov
ikovalyov
/ simple-state-machine-6.kt
Created
March 31, 2020 22:42
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| fun main() { | |
| println(processRequest(1)) | |
| println(processRequest(10)) | |
| println(processRequest(-1)) | |
| } | |
| // 2 | |
| // 20 | |
| // -1 |
ikovalyov
/ simple-state-machine-5.kt
Created
March 31, 2020 22:41
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| fun processRequest(input: Int): Int { | |
| val initial = State.RequestReceived(input) | |
| val result = transitions.fold(initial) | |
| return if (result.validationResult) { | |
| result.previousState.response | |
| } else { | |
| -1 | |
| } | |
| } |
ikovalyov
/ simple-state-machine-4.kt
Created
March 31, 2020 22:40
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| val transitions = listOf( | |
| ValidateRequest(), | |
| ProcessRequest(), | |
| ValidateResponse() | |
| ) |
ikovalyov
/ simple-state-machine-3.kt
Created
March 31, 2020 22:39
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| fun List<Transition<State, State>>.fold(initial: State.RequestReceived): State.ResponseValidated { | |
| var currentState: State = initial | |
| forEach { | |
| currentState = it.invoke(currentState) | |
| } | |
| if (currentState is State.ResponseValidated) { | |
| return currentState as State.ResponseValidated | |
| } else { | |
| throw IllegalStateException("currentState is not of State.ResponseValidated type") | |
| } |
ikovalyov
/ simple-state-machine-2.kt
Last active
April 7, 2020 07:20
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| abstract class Transition<InputState: State, OutputState: State> { | |
| abstract fun invoke(state: InputState) : OutputState | |
| } | |
| class ValidateRequest: Transition<State.RequestReceived, State.RequestValidated>() { | |
| override fun invoke(state: State.RequestReceived): State.RequestValidated { | |
| // let's just check something here | |
| return State.RequestValidated(state.request > 0, state) | |
| } | |
| } |
ikovalyov
/ simple-state-machine-1.kt
Last active
March 31, 2020 22:36
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| sealed class State(val previousState: State?) { | |
| class RequestReceived(val request: Int): State(null) | |
| class RequestValidated(val validationResult: Boolean, previousState: RequestReceived): State(previousState) | |
| class RequestProcessed(val response: Int, previousState: RequestValidated): State(previousState) | |
| class ResponseValidated(val validationResult: Boolean, previousState: RequestProcessed): State(previousState) | |
| } |
ikovalyov
/ application-state-4.kt
Created
March 29, 2020 14:02
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| val teaPotTurnedOn = if (turnOnTheTeaPot) { | |
| // region Turning teapot on | |
| teaPotService.turnOn() | |
| true | |
| // endregion | |
| } else { | |
| // region Turning teapot off | |
| teaPotService.turnOff() | |
| false | |
| // endregion |
ikovalyov
/ application-state-3.kt
Created
March 29, 2020 14:00
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| fun turnOnTheTeaPot(teapotService: TeaPotService) : Boolean { | |
| teaPotService.turnOn() | |
| return true | |
| } | |
| fun turnOffTheTeaPot(teapotService: TeaPotService) : Boolean { | |
| teaPotService.turnOff() | |
| return false | |
| } |
ikovalyov
/ application-state-2.kt
Created
March 29, 2020 13:59
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| if (turnOnTheTeaPot) { | |
| // Turning teapot on | |
| teaPotService.turnOn() | |
| teaPotTurnedOn = true | |
| } else { | |
| // Turning teapot off | |
| teaPotService.turnOff() | |
| teaPotTurnedOn = false | |
| } |
ikovalyov
/ application-state-1.kt
Created
March 29, 2020 13:57
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| class TeaPotService { | |
| fun turnOn() { | |
| //do something | |
| } | |
| fun turnOff() { | |
| //do something | |
| } | |
| } | |
| fun main() { |
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