203 lines
6.6 KiB
Kotlin
203 lines
6.6 KiB
Kotlin
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/*
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* Copyright (c) 2021 Proton Technologies AG
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* This file is part of Proton Technologies AG and ProtonCore.
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*
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* ProtonCore is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* ProtonCore is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ProtonCore. If not, see <https://www.gnu.org/licenses/>.
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*/
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package me.proton.core.eventmanager.domain
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import me.proton.core.domain.entity.UserId
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import me.proton.core.eventmanager.domain.entity.Action
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import me.proton.core.eventmanager.domain.entity.Event
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import me.proton.core.eventmanager.domain.entity.EventsResponse
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import me.proton.core.eventmanager.domain.extension.groupByAction
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import me.proton.core.util.kotlin.takeIfNotEmpty
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abstract class EventListener<K, T : Any> : TransactionHandler {
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private val actionMapByUserId = mutableMapOf<UserId, Map<Action, List<Event<K, T>>>>()
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/**
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* Type of Event loop.
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*/
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enum class Type {
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/**
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* Core Event loop.
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*
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* Contains: Messages, Conversations, Import, Contacts, Filter, Labels, Subscriptions, User, Settings, ...
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*/
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Core,
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/**
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* Calendar Event loop.
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*
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* Contains: Calendars, CalendarKeys, CalendarEvents, CalendarAlarms, Settings, CalendarSubscriptions, ...
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*/
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Calendar,
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/**
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* Drive Event loop.
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*
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* Contains: Share, Links, Nodes, ...
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*/
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Drive
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}
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/**
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* Listener [type] to associate with this [EventListener].
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*/
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abstract val type: Type
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/**
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* The degrees of separation from this entity to the User entity.
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*
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* Examples:
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* - UserEventListener: User => 0.
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* - UserAddressEventListener: UserAddress -> User => 1.
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* - ContactEventListener: Contact -> User => 1.
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* - ContactEmailEventListener: ContactEmail -> Contact -> User => 2.
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*/
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abstract val order: Int
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/**
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* Get actions part of the current set of modifications.
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*
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* Note: The map is created just before [onPrepare], and cleared after [onComplete].
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*/
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fun getActionMap(userId: UserId): Map<Action, List<Event<K, T>>> {
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return actionMapByUserId.getOrPut(userId) { emptyMap() }
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}
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/**
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* Set the actions part of the current set of modifications.
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*
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* Note: Called before [notifyPrepare] and after [notifyComplete].
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*/
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fun setActionMap(userId: UserId, events: List<Event<K, T>>) {
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actionMapByUserId[userId] = events.groupByAction()
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}
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/**
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* Notify to prepare any additional data (e.g. foreign key).
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*
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* Note: No transaction wraps this function.
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*/
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suspend fun notifyPrepare(userId: UserId) {
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val actions = getActionMap(userId)
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val entities = actions[Action.Create].orEmpty() + actions[Action.Update].orEmpty()
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entities.takeIfNotEmpty()?.let { list -> onPrepare(userId, list.mapNotNull { it.entity }) }
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}
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/**
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* Notify all events in this order [onCreate], [onUpdate], [onPartial] and [onDelete].
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*
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* Note: A transaction wraps this function.
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*/
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suspend fun notifyEvents(userId: UserId) {
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val actions = getActionMap(userId)
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actions[Action.Create]?.takeIfNotEmpty()?.let { list -> onCreate(userId, list.mapNotNull { it.entity }) }
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actions[Action.Update]?.takeIfNotEmpty()?.let { list -> onUpdate(userId, list.mapNotNull { it.entity }) }
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actions[Action.Partial]?.takeIfNotEmpty()?.let { list -> onPartial(userId, list.mapNotNull { it.entity }) }
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actions[Action.Delete]?.takeIfNotEmpty()?.let { list -> onDelete(userId, list.map { it.key }) }
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}
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/**
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* Notify to reset all entities.
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*
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* Note: No transaction wraps this function.
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*/
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suspend fun notifyResetAll(userId: UserId) {
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onResetAll(userId)
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}
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/**
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* Notify complete, whether set of modifications was successful or not.
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*
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* Note: No transaction wraps this function.
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*/
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suspend fun notifyComplete(userId: UserId) {
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onComplete(userId)
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setActionMap(userId, emptyList())
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}
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/**
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* Deserialize [response] into a typed list of [Event].
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*/
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abstract suspend fun deserializeEvents(response: EventsResponse): List<Event<K, T>>?
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/**
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* Called before applying a set of modifications to prepare any additional action (e.g. fetch foreign entities).
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*
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* Note: Delete action entities are filtered out.
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*
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* @see onComplete
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*/
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open suspend fun onPrepare(userId: UserId, entities: List<T>) = Unit
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/**
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* Called at the end of a set of modifications, whether it is successful or not.
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*
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* @see onPrepare
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*/
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open suspend fun onComplete(userId: UserId) = Unit
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/**
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* Called to created entities in persistence.
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*
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* There is no guarantee any prior [onCreate] will be called for any needed foreign entity.
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*
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* Note: A transaction wraps this function and must return as fast as possible.
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*
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* @see onPrepare
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*/
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open suspend fun onCreate(userId: UserId, entities: List<T>) = Unit
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/**
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* Called to update or insert entities in persistence.
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*
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* There is no guarantee any prior [onCreate] will be called for any needed foreign entity.
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*
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* Note: A transaction wraps this function and must return as fast as possible.
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*
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* @see onPrepare
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*/
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open suspend fun onUpdate(userId: UserId, entities: List<T>) = Unit
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/**
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* Called to partially update entities in persistence.
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*
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* There is no guarantee any prior [onCreate] will be called for any needed foreign entity.
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*
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* Note: A transaction wraps this function and must return as fast as possible.
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*
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* @see onPrepare
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*/
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open suspend fun onPartial(userId: UserId, entities: List<T>) = Unit
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/**
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* Called to delete, if exist, entities in persistence.
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*
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* Note: A transaction wraps this function and must return as fast as possible.
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*/
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open suspend fun onDelete(userId: UserId, keys: List<K>) = Unit
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/**
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* Called to reset/delete all entities in persistence, for this type.
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*
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* Note: Usually a good time the fetch minimal data after deletion.
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*/
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open suspend fun onResetAll(userId: UserId) = Unit
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}
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