40 lines
1.5 KiB
Kotlin
40 lines
1.5 KiB
Kotlin
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// This is example code for the 'Simplified Example' section of
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// /docs/architecture-overview.md
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class HistoryStorageMiddleware(
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private val storage: HistoryStorage
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private val scope: CoroutineScope,
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) : Middleware<HistoryState, HistoryAction> {
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override fun invoke(
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context: MiddlewareContext<HistoryState, HistoryAction>,
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next: (HistoryAction) -> Unit,
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action: HistoryAction,
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) {
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// This middleware won't need to manipulate the action, so the action can be passed through
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// the middleware chain before the side-effects are initiated
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next(action)
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when(action) {
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is HistoryAction.Init -> {
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scope.launch {
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val history = storage.load()
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context.store.dispatch(HistoryAction.ItemsChanged(history))
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}
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}
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is HistoryAction.DeleteItems -> {
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scope.launch {
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val currentItems = context.state.items
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if (storage.delete(action.items) is HistoryStorage.Success) {
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context.store.dispatch(
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HistoryAction.DeleteFinished()
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)
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}
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}
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}
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else -> Unit
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}
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}
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}
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