mirror of
https://github.com/InsanusMokrassar/MicroUtils.git
synced 2024-06-02 07:55:13 +00:00
90 lines
3.1 KiB
Kotlin
90 lines
3.1 KiB
Kotlin
package dev.inmo.micro_utils.fsm.common
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import dev.inmo.micro_utils.coroutines.launchSafelyWithoutExceptions
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import dev.inmo.micro_utils.coroutines.subscribeSafelyWithoutExceptions
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import kotlinx.coroutines.*
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/**
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* Default [StatesMachine] may [startChain] and use inside logic for handling [State]s. By default you may use
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* [DefaultStatesMachine] or build it with [dev.inmo.micro_utils.fsm.common.dsl.buildFSM]. Implementers MUST NOT start
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* handling until [start] method will be called
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*/
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interface StatesMachine<T : State> : StatesHandler<T, T> {
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suspend fun launchStateHandling(
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state: T,
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handlers: List<CheckableHandlerHolder<in T, T>>
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): T? {
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return handlers.firstOrNull { it.checkHandleable(state) } ?.run {
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handleState(state)
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}
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}
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/**
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* Starts handling of [State]s
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*/
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fun start(scope: CoroutineScope): Job
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/**
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* Start chain of [State]s witn [state]
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*/
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suspend fun startChain(state: T)
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companion object {
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/**
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* Creates [DefaultStatesMachine]
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*/
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operator fun <T: State> invoke(
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statesManager: StatesManager<T>,
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handlers: List<CheckableHandlerHolder<in T, T>>
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) = DefaultStatesMachine(statesManager, handlers)
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}
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}
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/**
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* Default realization of [StatesMachine]. It uses [statesManager] for incapsulation of [State]s storing and contexts
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* resolving, and uses [launchStateHandling] for [State] handling
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*/
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class DefaultStatesMachine <T: State>(
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private val statesManager: StatesManager<T>,
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private val handlers: List<CheckableHandlerHolder<in T, T>>
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) : StatesMachine<T> {
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/**
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* Will call [launchStateHandling] for state handling
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*/
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override suspend fun StatesMachine<in T>.handleState(state: T): T? = launchStateHandling(state, handlers)
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/**
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* Launch handling of states. On [statesManager] [StatesManager.onStartChain],
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* [statesManager] [StatesManager.onChainStateUpdated] will be called lambda with performing of state. If
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* [launchStateHandling] will returns some [State] then [statesManager] [StatesManager.update] will be used, otherwise
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* [StatesManager.endChain].
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*/
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override fun start(scope: CoroutineScope): Job = scope.launchSafelyWithoutExceptions {
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val statePerformer: suspend (T) -> Unit = { state: T ->
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val newState = launchStateHandling(state, handlers)
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if (newState != null) {
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statesManager.update(state, newState)
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} else {
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statesManager.endChain(state)
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}
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}
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statesManager.onStartChain.subscribeSafelyWithoutExceptions(this) {
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launch { statePerformer(it) }
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}
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statesManager.onChainStateUpdated.subscribeSafelyWithoutExceptions(this) {
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launch { statePerformer(it.second) }
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}
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statesManager.getActiveStates().forEach {
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launch { statePerformer(it) }
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}
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}
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/**
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* Just calls [StatesManager.startChain] of [statesManager]
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*/
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override suspend fun startChain(state: T) {
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statesManager.startChain(state)
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}
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}
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