mirror of https://github.com/nextcloud/android
151 lines
5.3 KiB
Kotlin
151 lines
5.3 KiB
Kotlin
/*
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* Nextcloud - Android Client
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*
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* SPDX-FileCopyrightText: 2023 Alper Ozturk <alper_ozturk@proton.me>
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* SPDX-FileCopyrightText: 2023 Nextcloud GmbH
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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package com.nextcloud.client.files
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import com.nextcloud.client.jobs.transfer.Transfer
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import com.nextcloud.client.jobs.transfer.TransferState
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import com.owncloud.android.datamodel.OCFile
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import java.util.UUID
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import kotlin.math.max
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import kotlin.math.min
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/**
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* This class tracks status of file transfers. It serves as a state
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* machine and drives the transfer background task scheduler via callbacks.
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* Transfer status updates trigger change callbacks that should be used
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* to notify listeners.
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*
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* No listener registration mechanism is provided at this level.
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*
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* This class is not thread-safe. All access from multiple threads shall
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* be lock protected.
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*
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* @property onStartTransfer callback triggered when transfer is switched into running state
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* @property onTransferChanged callback triggered whenever transfer status update
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* @property maxRunning maximum number of allowed simultaneous transfers
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*/
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internal class Registry(
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private val onStartTransfer: (UUID, Request) -> Unit,
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private val onTransferChanged: (Transfer) -> Unit,
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private val maxRunning: Int = 2
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) {
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private val pendingQueue = LinkedHashMap<UUID, Transfer>()
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private val runningQueue = LinkedHashMap<UUID, Transfer>()
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private val completedQueue = LinkedHashMap<UUID, Transfer>()
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val isRunning: Boolean get() = pendingQueue.size > 0 || runningQueue.size > 0
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val pending: List<Transfer> get() = pendingQueue.map { it.value }
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val running: List<Transfer> get() = runningQueue.map { it.value }
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val completed: List<Transfer> get() = completedQueue.map { it.value }
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/**
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* Insert new transfer into a pending queue.
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*
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* @return scheduled transfer id
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*/
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fun add(request: Request): UUID {
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val transfer = Transfer(
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uuid = request.uuid,
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state = TransferState.PENDING,
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progress = 0,
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file = request.file,
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request = request
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)
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pendingQueue[transfer.uuid] = transfer
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return transfer.uuid
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}
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/**
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* Move pending transfers into a running queue up
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* to max allowed simultaneous transfers.
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*/
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fun startNext() {
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val freeThreads = max(0, maxRunning - runningQueue.size)
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for (i in 0 until min(freeThreads, pendingQueue.size)) {
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val key = pendingQueue.keys.first()
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val pendingTransfer = pendingQueue.remove(key) ?: throw IllegalStateException("Transfer $key not found")
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val runningTransfer = pendingTransfer.copy(state = TransferState.RUNNING)
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runningQueue[key] = runningTransfer
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onStartTransfer.invoke(key, runningTransfer.request)
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onTransferChanged(runningTransfer)
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}
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}
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/**
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* Update progress for a given transfer. If no transfer of a given id is currently running,
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* update is ignored.
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*
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* @param uuid ID of the transfer to update
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* @param progress progress 0-100%
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*/
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fun progress(uuid: UUID, progress: Int) {
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val transfer = runningQueue[uuid]
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if (transfer != null) {
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val runningTransfer = transfer.copy(progress = progress)
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runningQueue[uuid] = runningTransfer
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onTransferChanged(runningTransfer)
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}
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}
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/**
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* Complete currently running transfer. If no transfer of a given id is currently running,
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* update is ignored.
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*
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* @param uuid of the transfer to complete
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* @param success if true, transfer will be marked as completed; if false - as failed
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* @param file if provided, update file in transfer status; if null, existing value is retained
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*/
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fun complete(uuid: UUID, success: Boolean, file: OCFile? = null) {
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val transfer = runningQueue.remove(uuid)
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if (transfer != null) {
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val status = if (success) {
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TransferState.COMPLETED
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} else {
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TransferState.FAILED
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}
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val completedTransfer = transfer.copy(state = status, file = file ?: transfer.file)
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completedQueue[uuid] = completedTransfer
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onTransferChanged(completedTransfer)
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}
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}
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/**
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* Search for a transfer by file path. It traverses
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* through all queues in order of pending, running and completed
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* transfers and returns first transfer status matching
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* file path.
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*
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* @param file Search for a file transfer
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* @return transfer status if found, null otherwise
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*/
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fun getTransfer(file: OCFile): Transfer? {
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arrayOf(pendingQueue, runningQueue, completedQueue).forEach { queue ->
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queue.forEach { entry ->
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if (entry.value.request.file.remotePath == file.remotePath) {
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return entry.value
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}
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}
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}
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return null
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}
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/**
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* Get transfer status by id. It traverses
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* through all queues in order of pending, running and completed
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* transfers and returns first transfer status matching
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* file path.
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*
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* @param id transfer id
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* @return transfer status if found, null otherwise
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*/
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fun getTransfer(uuid: UUID): Transfer? {
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return pendingQueue[uuid] ?: runningQueue[uuid] ?: completedQueue[uuid]
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}
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}
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