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InsanusMokrassar
2021-06-19 13:57:34 +06:00
parent c4e18ad25f
commit b45bd3192a
6 changed files with 101 additions and 64 deletions
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10
fsm/core/src/commonMain/kotlin/dev/inmo/tgbotapi/libraries/fsm/core/StateHandlerHolder.kt
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@@ -2,14 +2,14 @@ package dev.inmo.tgbotapi.libraries.fsm.core
import kotlin.reflect.KClass
class StateHandlerHolder<I : State, O : State>(
class StateHandlerHolder<I : State>(
private val inputKlass: KClass<I>,
private val strict: Boolean = false,
private val delegateTo: StatesHandler<I, O>
) : StatesHandler<State, O> {
private val delegateTo: StatesHandler<I>
) : StatesHandler<State> {
fun checkHandleable(state: State) = state::class == inputKlass || (!strict && inputKlass.isInstance(state))
override suspend fun handleState(state: State): O? {
return delegateTo.handleState(state as I)
override suspend fun StatesMachine.handleState(state: State): State? {
return delegateTo.run { handleState(state as I) }
}
}

4
fsm/core/src/commonMain/kotlin/dev/inmo/tgbotapi/libraries/fsm/core/StatesHandler.kt
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@@ -1,5 +1,5 @@
package dev.inmo.tgbotapi.libraries.fsm.core
fun interface StatesHandler<I : State, O : State> {
suspend fun handleState(state: I): O?
fun interface StatesHandler<I : State> {
suspend fun StatesMachine.handleState(state: I): State?
}

32
fsm/core/src/commonMain/kotlin/dev/inmo/tgbotapi/libraries/fsm/core/StatesMachine.kt
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@@ -4,26 +4,24 @@ import dev.inmo.micro_utils.coroutines.*
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.asFlow
private suspend fun <I : State, O : State> launchStateHandling(
private suspend fun <I : State> StatesMachine.launchStateHandling(
state: State,
handlers: List<StateHandlerHolder<out I, out O>>
): O? {
return handlers.firstOrNull { it.checkHandleable(state) } ?.handleState(
state
)
handlers: List<StateHandlerHolder<out I>>
): State? {
return handlers.firstOrNull { it.checkHandleable(state) } ?.run {
handleState(state)
}
}
class StatesMachine<T : State, I : T, O : T>(
private val statesManager: StatesManager<T>,
private val handlers: List<StateHandlerHolder<out I, out O>>
) : StatesHandler<T, O> {
override suspend fun handleState(state: T): O? {
return launchStateHandling(state, handlers)
}
class StatesMachine (
private val statesManager: StatesManager,
private val handlers: List<StateHandlerHolder<*>>
) : StatesHandler<State> {
override suspend fun StatesMachine.handleState(state: State): State? = launchStateHandling(state, handlers)
fun start(scope: CoroutineScope): Job = scope.launchSafelyWithoutExceptions {
val statePerformer: suspend (T) -> Unit = { state: T ->
val newState = handleState(state)
val statePerformer: suspend (State) -> Unit = { state: State ->
val newState = launchStateHandling(state, handlers)
if (newState != null) {
statesManager.update(state, newState)
} else {
@@ -41,4 +39,8 @@ class StatesMachine<T : State, I : T, O : T>(
launch { statePerformer(it) }
}
}
suspend fun startChain(state: State) {
statesManager.startChain(state)
}
}

46
fsm/core/src/commonMain/kotlin/dev/inmo/tgbotapi/libraries/fsm/core/StatesManager.kt
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@@ -4,30 +4,30 @@ import kotlinx.coroutines.flow.*
import kotlinx.coroutines.sync.Mutex
import kotlinx.coroutines.sync.withLock
interface StatesManager<T : State> {
val onChainStateUpdated: Flow<Pair<T, T>>
val onStartChain: Flow<T>
val onEndChain: Flow<T>
interface StatesManager {
val onChainStateUpdated: Flow<Pair<State, State>>
val onStartChain: Flow<State>
val onEndChain: Flow<State>
/**
* Must set current set using [State.context]
*/
suspend fun update(old: T, new: T)
suspend fun update(old: State, new: State)
/**
* Starts chain with [state] as first [State]. May returns false in case of [State.context] of [state] is already
* busy by the other [State]
*/
suspend fun startChain(state: T)
suspend fun startChain(state: State)
/**
* Ends chain with context from [state]. In case when [State.context] of [state] is absent, [state] should be just
* ignored
*/
suspend fun endChain(state: T)
suspend fun endChain(state: State)
suspend fun getActiveStates(): List<T>
suspend fun getActiveStates(): List<State>
}
/**
@@ -35,20 +35,20 @@ interface StatesManager<T : State> {
* key. In case when this callback will returns true, the state placed on [State.context] of new will be replaced by
* new state by using [endChain] with that state
*/
class InMemoryStatesManager<T : State>(
private val onContextsConflictResolver: suspend (old: T, new: T, currentNew: T) -> Boolean = { _, _, _ -> true }
) : StatesManager<T> {
private val _onChainStateUpdated = MutableSharedFlow<Pair<T, T>>(0)
override val onChainStateUpdated: Flow<Pair<T, T>> = _onChainStateUpdated.asSharedFlow()
private val _onStartChain = MutableSharedFlow<T>(0)
override val onStartChain: Flow<T> = _onStartChain.asSharedFlow()
private val _onEndChain = MutableSharedFlow<T>(0)
override val onEndChain: Flow<T> = _onEndChain.asSharedFlow()
class InMemoryStatesManager(
private val onContextsConflictResolver: suspend (old: State, new: State, currentNew: State) -> Boolean = { _, _, _ -> true }
) : StatesManager {
private val _onChainStateUpdated = MutableSharedFlow<Pair<State, State>>(0)
override val onChainStateUpdated: Flow<Pair<State, State>> = _onChainStateUpdated.asSharedFlow()
private val _onStartChain = MutableSharedFlow<State>(0)
override val onStartChain: Flow<State> = _onStartChain.asSharedFlow()
private val _onEndChain = MutableSharedFlow<State>(0)
override val onEndChain: Flow<State> = _onEndChain.asSharedFlow()
private val contextsToStates = mutableMapOf<Any, T>()
private val contextsToStates = mutableMapOf<Any, State>()
private val mapMutex = Mutex()
override suspend fun update(old: T, new: T) = mapMutex.withLock {
override suspend fun update(old: State, new: State) = mapMutex.withLock {
when {
contextsToStates[old.context] != old -> return@withLock
old.context == new.context || !contextsToStates.containsKey(new.context) -> {
@@ -67,26 +67,26 @@ class InMemoryStatesManager<T : State>(
}
}
override suspend fun startChain(state: T) = mapMutex.withLock {
override suspend fun startChain(state: State) = mapMutex.withLock {
if (!contextsToStates.containsKey(state.context)) {
contextsToStates[state.context] = state
_onStartChain.emit(state)
}
}
private suspend fun endChainWithoutLock(state: T) {
private suspend fun endChainWithoutLock(state: State) {
if (contextsToStates[state.context] == state) {
contextsToStates.remove(state.context)
_onEndChain.emit(state)
}
}
override suspend fun endChain(state: T) {
override suspend fun endChain(state: State) {
mapMutex.withLock {
endChainWithoutLock(state)
}
}
override suspend fun getActiveStates(): List<T> = contextsToStates.values.toList()
override suspend fun getActiveStates(): List<State> = contextsToStates.values.toList()
}

35
fsm/core/src/commonMain/kotlin/dev/inmo/tgbotapi/libraries/fsm/core/dsl/FSMBuilder.kt Normal file
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@@ -0,0 +1,35 @@
package dev.inmo.tgbotapi.libraries.fsm.core.dsl
import dev.inmo.tgbotapi.libraries.fsm.core.*
import kotlin.reflect.KClass
class FSMBuilder(
var statesManager: StatesManager = InMemoryStatesManager()
) {
private var states = mutableListOf<StateHandlerHolder<*>>()
fun <I : State> add(kClass: KClass<I>, handler: StatesHandler<I>) {
states.add(StateHandlerHolder(kClass, false, handler))
}
fun <I : State> addStrict(kClass: KClass<I>, handler: StatesHandler<I>) {
states.add(StateHandlerHolder(kClass, true, handler))
}
fun build() = StatesMachine(
statesManager,
states.toList()
)
}
inline fun <reified I : State> FSMBuilder.onStateOrSubstate(handler: StatesHandler<I>) {
add(I::class, handler)
}
inline fun <reified I : State> FSMBuilder.strictlyOn(handler: StatesHandler<I>) {
addStrict(I::class, handler)
}
fun buildFSM(
block: FSMBuilder.() -> Unit
): StatesMachine = FSMBuilder().apply(block).build()

24
fsm/core/src/jvmTest/kotlin/PlayableMain.kt
View File

@@ -1,4 +1,6 @@
import dev.inmo.tgbotapi.libraries.fsm.core.*
import dev.inmo.tgbotapi.libraries.fsm.core.dsl.buildFSM
import dev.inmo.tgbotapi.libraries.fsm.core.dsl.strictlyOn
import kotlinx.coroutines.*
import kotlin.random.Random
import kotlin.test.Test
@@ -24,27 +26,25 @@ class PlayableMain {
}
}
val statesManager = InMemoryStatesManager<TrafficLightState>()
val statesManager = InMemoryStatesManager()
val machine = StatesMachine(
statesManager,
listOf(
StateHandlerHolder(GreenCommon::class) {
val machine = buildFSM {
strictlyOn<GreenCommon> {
delay(1000L)
YellowCommon(it.context).also(::println)
},
StateHandlerHolder(YellowCommon::class) {
}
strictlyOn<YellowCommon> {
delay(1000L)
RedCommon(it.context).also(::println)
},
StateHandlerHolder(RedCommon::class) {
}
strictlyOn<RedCommon> {
delay(1000L)
GreenCommon(it.context).also(::println)
}
)
)
this.statesManager = statesManager
}
initialStates.forEach { statesManager.startChain(it) }
initialStates.forEach { machine.startChain(it) }
val scope = CoroutineScope(Dispatchers.Default)
machine.start(scope).join()