163 lines
5.9 KiB
Kotlin
163 lines
5.9 KiB
Kotlin
/*
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* Nextcloud Android client application
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*
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* @author Chris Narkiewicz
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* Copyright (C) 2020 Chris Narkiewicz <hello@ezaquarii.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero 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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* This program 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.nextcloud.client.files.downloader
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import com.owncloud.android.datamodel.OCFile
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import java.lang.IllegalStateException
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import java.util.TreeMap
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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 all downloads. It serves as a state
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* machine and drives the download background task scheduler via callbacks.
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* Download status updates are triggering 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 onStartDownload callback triggered when download is switched into running state
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* @property onDownloadChanged callback triggered whenever download status update
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* @property maxRunning maximum number of allowed simultaneous downloads
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*/
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internal class Registry(
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private val onStartDownload: (UUID, Request) -> Unit,
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private val onDownloadChanged: (Download) -> Unit,
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private val maxRunning: Int = 2
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) {
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private val pendingQueue = TreeMap<UUID, Download>()
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private val runningQueue = TreeMap<UUID, Download>()
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private val completedQueue = TreeMap<UUID, Download>()
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val isRunning: Boolean get() = pendingQueue.size > 0 || runningQueue.size > 0
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val pending: List<Download> get() = pendingQueue.map { it.value }
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val running: List<Download> get() = runningQueue.map { it.value }
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val completed: List<Download> get() = completedQueue.map { it.value }
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/**
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* Insert new download into a pending queue.
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*
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* @return scheduled download id
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*/
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fun add(request: Request): UUID {
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val download = Download(
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uuid = request.uuid,
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state = DownloadState.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[download.uuid] = download
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return download.uuid
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}
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/**
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* Move pending downloads into a running queue up
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* to max allowed simultaneous downloads.
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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.firstKey()
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val pendingDownload = pendingQueue.remove(key) ?: throw IllegalStateException("Download $key not exist.")
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val runningDownload = pendingDownload.copy(state = DownloadState.RUNNING)
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runningQueue[key] = runningDownload
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onStartDownload.invoke(key, runningDownload.request)
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onDownloadChanged(runningDownload)
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}
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}
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/**
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* Update progress for a given download. If no download 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 download 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 download = runningQueue[uuid]
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if (download != null) {
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val runningDownload = download.copy(progress = progress)
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runningQueue[uuid] = runningDownload
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onDownloadChanged(runningDownload)
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}
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}
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/**
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* Complete currently running download. If no download 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 download to complete
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* @param success if true, download will be marked as completed; if false - as failed
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* @param file if provided, update file in download 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 download = runningQueue.remove(uuid)
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if (download != null) {
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val status = if (success) {
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DownloadState.COMPLETED
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} else {
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DownloadState.FAILED
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}
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val completedDownload = download.copy(state = status, file = file ?: download.file)
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completedQueue[uuid] = completedDownload
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onDownloadChanged(completedDownload)
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}
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}
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/**
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* Search for a download by file path. It traverses
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* through all queues in order of pending, running and completed
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* downloads and returns first download status matching
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* file path.
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*
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* @param file Search for a file download
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* @return download status if found, null otherwise
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*/
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fun getDownload(file: OCFile): Download? {
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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 download status by id. It traverses
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* through all queues in order of pending, running and completed
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* downloads and returns first download status matching
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* file path.
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*
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* @param id download id
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* @return download status if found, null otherwise
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*/
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fun getDownload(uuid: UUID): Download? {
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return pendingQueue[uuid] ?: runningQueue[uuid] ?: completedQueue[uuid]
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}
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}
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