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add conflicts resolver for default states managers

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InsanusMokrassar 2022-03-27 17:15:23 +06:00
parent a328c4425a
commit 99b09c8b28
3 changed files with 23 additions and 8 deletions
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3
CHANGELOG.md
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@ -6,7 +6,8 @@
* New extensions `Element#onVisibilityChanged`, `Element#onVisible` and `Element#onInvisible`
* `Coroutines`:
* New extension `Element.visibilityFlow()`
* `FSM`:
* Now it is possible to resolve conflicts on `startChain`
## 0.9.16

21
fsm/common/src/commonMain/kotlin/dev/inmo/micro_utils/fsm/common/managers/DefaultStatesManager.kt
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@ -39,13 +39,14 @@ interface DefaultStatesManagerRepo<T : State> {
* @param repo This repo will be used as repository for storing states. All operations with this repo will happen BEFORE
* any event will be sent to [onChainStateUpdated], [onStartChain] or [onEndChain]. By default, will be used
* [InMemoryDefaultStatesManagerRepo] or you may create custom [DefaultStatesManagerRepo] and pass as [repo] parameter
* @param onContextsConflictResolver Receive old [State], new one and the state currently placed on new [State.context]
* @param onUpdateContextsConflictResolver Receive old [State], new one and the state currently placed on new [State.context]
* 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
*/
open class DefaultStatesManager<T : State>(
protected val repo: DefaultStatesManagerRepo<T> = InMemoryDefaultStatesManagerRepo(),
protected val onContextsConflictResolver: suspend (old: T, new: T, currentNew: T) -> Boolean = { _, _, _ -> true }
protected val onStartContextsConflictResolver: suspend (old: T, new: T) -> Boolean = { _, _ -> true },
protected val onUpdateContextsConflictResolver: suspend (old: T, new: T, currentNew: T) -> Boolean = { _, _, _ -> true }
) : StatesManager<T> {
protected val _onChainStateUpdated = MutableSharedFlow<Pair<T, T>>(0)
override val onChainStateUpdated: Flow<Pair<T, T>> = _onChainStateUpdated.asSharedFlow()
@ -56,6 +57,14 @@ open class DefaultStatesManager<T : State>(
protected val mapMutex = Mutex()
constructor(
repo: DefaultStatesManagerRepo<T>,
onContextsConflictResolver: suspend (old: T, new: T, currentNew: T) -> Boolean
) : this (
repo,
onUpdateContextsConflictResolver = onContextsConflictResolver
)
override suspend fun update(old: T, new: T) = mapMutex.withLock {
val stateByOldContext: T? = repo.getContextState(old.context)
when {
@ -67,7 +76,7 @@ open class DefaultStatesManager<T : State>(
}
else -> {
val stateOnNewOneContext = repo.getContextState(new.context)
if (stateOnNewOneContext == null || onContextsConflictResolver(old, new, stateOnNewOneContext)) {
if (stateOnNewOneContext == null || onUpdateContextsConflictResolver(old, new, stateOnNewOneContext)) {
stateOnNewOneContext ?.let { endChainWithoutLock(it) }
repo.removeState(old)
repo.set(new)
@ -78,7 +87,11 @@ open class DefaultStatesManager<T : State>(
}
override suspend fun startChain(state: T) = mapMutex.withLock {
if (!repo.contains(state.context)) {
val stateOnContext = repo.getContextState(state.context)
if (stateOnContext == null || onStartContextsConflictResolver(stateOnContext, state)) {
stateOnContext ?.let {
endChainWithoutLock(it)
}
repo.set(state)
_onStartChain.emit(state)
}

5
fsm/common/src/commonMain/kotlin/dev/inmo/micro_utils/fsm/common/managers/InMemoryStatesManager.kt
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@ -12,5 +12,6 @@ import kotlinx.coroutines.flow.*
*/
@Deprecated("Use DefaultStatesManager instead", ReplaceWith("DefaultStatesManager"))
fun <T: State> InMemoryStatesManager(
onContextsConflictResolver: suspend (old: T, new: T, currentNew: T) -> Boolean = { _, _, _ -> true }
) = DefaultStatesManager(onContextsConflictResolver = onContextsConflictResolver)
onStartContextsConflictResolver: suspend (old: T, new: T) -> Boolean = { _, _ -> true },
onUpdateContextsConflictResolver: suspend (old: T, new: T, currentNew: T) -> Boolean = { _, _, _ -> true }
) = DefaultStatesManager(onStartContextsConflictResolver = onStartContextsConflictResolver, onUpdateContextsConflictResolver = onUpdateContextsConflictResolver)