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Minor changes to fix a possible crash in the downloads view

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This commit is contained in:
len 2016-04-24 23:32:49 +02:00
parent 4befcf3819
commit bfb12bc7c1
3 changed files with 108 additions and 130 deletions
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104
app/src/main/java/eu/kanade/tachiyomi/ui/download/DownloadFragment.kt
View file

@ -10,7 +10,13 @@ import eu.kanade.tachiyomi.ui.main.MainActivity
import eu.kanade.tachiyomi.widget.NpaLinearLayoutManager
import kotlinx.android.synthetic.main.fragment_download_queue.*
import nucleus.factory.RequiresPresenter
import rx.Observable
import rx.Subscription
import rx.android.schedulers.AndroidSchedulers
import rx.schedulers.Schedulers
import rx.subscriptions.CompositeSubscription
import java.util.*
import java.util.concurrent.TimeUnit
/**
* Fragment that shows the currently active downloads.
@ -40,9 +46,14 @@ class DownloadFragment : BaseRxFragment<DownloadPresenter>() {
private var clearButton: MenuItem? = null
/**
* Subscription to know if the download queue is running.
* Subscription list to be cleared during [onPause].
*/
private var queueStatusSubscription: Subscription? = null
private val resumeSubscriptions by lazy { CompositeSubscription() }
/**
* Map of subscriptions for active downloads.
*/
private val progressSubscriptions by lazy { HashMap<Download, Subscription>() }
/**
* Whether the download queue is running or not.
@ -66,8 +77,7 @@ class DownloadFragment : BaseRxFragment<DownloadPresenter>() {
setHasOptionsMenu(true)
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedState: Bundle?): View? {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedState: Bundle?): View {
return inflater.inflate(R.layout.fragment_download_queue, container, false)
}
@ -123,15 +133,91 @@ class DownloadFragment : BaseRxFragment<DownloadPresenter>() {
override fun onResume() {
super.onResume()
queueStatusSubscription = presenter.downloadManager.runningSubject
presenter.downloadManager.runningSubject
.observeOn(AndroidSchedulers.mainThread())
.subscribe { onQueueStatusChange(it) }
.apply { resumeSubscriptions.add(this) }
presenter.getStatusObservable()
.observeOn(AndroidSchedulers.mainThread())
.subscribe { onStatusChange(it) }
.apply { resumeSubscriptions.add(this) }
presenter.getProgressObservable()
.observeOn(AndroidSchedulers.mainThread())
.subscribe { onUpdateDownloadedPages(it) }
.apply { resumeSubscriptions.add(this) }
}
override fun onPause() {
queueStatusSubscription?.unsubscribe()
for (subscription in progressSubscriptions.values) {
subscription.unsubscribe()
}
progressSubscriptions.clear()
resumeSubscriptions.clear()
super.onPause()
}
/**
* Called when the status of a download changes.
*
* @param download the download whose status has changed.
*/
private fun onStatusChange(download: Download) {
when (download.status) {
Download.DOWNLOADING -> {
observeProgress(download)
// Initial update of the downloaded pages
onUpdateDownloadedPages(download)
}
Download.DOWNLOADED -> {
unsubscribeProgress(download)
onUpdateProgress(download)
onUpdateDownloadedPages(download)
}
Download.ERROR -> unsubscribeProgress(download)
}
}
/**
* Observe the progress of a download and notify the view.
*
* @param download the download to observe its progress.
*/
private fun observeProgress(download: Download) {
val subscription = Observable.interval(50, TimeUnit.MILLISECONDS, Schedulers.newThread())
// Get the sum of percentages for all the pages.
.flatMap {
Observable.from(download.pages)
.map { it.progress }
.reduce { x, y -> x + y }
}
// Keep only the latest emission to avoid backpressure.
.onBackpressureLatest()
.observeOn(AndroidSchedulers.mainThread())
.subscribe { progress ->
// Update the view only if the progress has changed.
if (download.totalProgress != progress) {
download.totalProgress = progress
onUpdateProgress(download)
}
}
// Avoid leaking subscriptions
progressSubscriptions.remove(download)?.unsubscribe()
progressSubscriptions.put(download, subscription)
}
/**
* Unsubscribes the given download from the progress subscriptions.
*
* @param download the download to unsubscribe.
*/
private fun unsubscribeProgress(download: Download) {
progressSubscriptions.remove(download)?.unsubscribe()
}
/**
* Called when the queue's status has changed. Updates the visibility of the buttons.
*
@ -157,16 +243,16 @@ class DownloadFragment : BaseRxFragment<DownloadPresenter>() {
}
/**
* Called from the presenter when the status of a download changes.
* Called when the progress of a download changes.
*
* @param download the download whose status has changed.
* @param download the download whose progress has changed.
*/
fun onUpdateProgress(download: Download) {
getHolder(download)?.notifyProgress()
}
/**
* Called from the presenter when a page of a download is downloaded.
* Called when a page of a download is downloaded.
*
* @param download the download whose page has been downloaded.
*/

2
app/src/main/java/eu/kanade/tachiyomi/ui/download/DownloadHolder.kt
View file

@ -10,7 +10,7 @@ import kotlinx.android.synthetic.main.item_download.view.*
* All the elements from the layout file "item_download" are available in this class.
*
* @param view the inflated view for this holder.
* @constructor creates a new library holder.
* @constructor creates a new download holder.
*/
class DownloadHolder(private val view: View) : RecyclerView.ViewHolder(view) {

132
app/src/main/java/eu/kanade/tachiyomi/ui/download/DownloadPresenter.kt
View file

@ -6,12 +6,7 @@ import eu.kanade.tachiyomi.data.download.model.Download
import eu.kanade.tachiyomi.data.download.model.DownloadQueue
import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
import rx.Observable
import rx.Subscription
import rx.android.schedulers.AndroidSchedulers
import rx.schedulers.Schedulers
import timber.log.Timber
import java.util.*
import java.util.concurrent.TimeUnit
import javax.inject.Inject
/**
@ -19,6 +14,13 @@ import javax.inject.Inject
*/
class DownloadPresenter : BasePresenter<DownloadFragment>() {
companion object {
/**
* Id of the restartable that returns the download queue.
*/
const val GET_DOWNLOAD_QUEUE = 1
}
/**
* Download manager.
*/
@ -30,28 +32,6 @@ class DownloadPresenter : BasePresenter<DownloadFragment>() {
val downloadQueue: DownloadQueue
get() = downloadManager.queue
/**
* Map of subscriptions for active downloads.
*/
private val progressSubscriptions by lazy { HashMap<Download, Subscription>() }
/**
* Subscription for status changes on downloads.
*/
private var statusSubscription: Subscription? = null
/**
* Subscription for downloaded pages for active downloads.
*/
private var pageProgressSubscription: Subscription? = null
companion object {
/**
* Id of the restartable that returns the download queue.
*/
const val GET_DOWNLOAD_QUEUE = 1
}
override fun onCreate(savedState: Bundle?) {
super.onCreate(savedState)
@ -65,102 +45,14 @@ class DownloadPresenter : BasePresenter<DownloadFragment>() {
}
}
override fun onTakeView(view: DownloadFragment) {
super.onTakeView(view)
statusSubscription = downloadQueue.getStatusObservable()
fun getStatusObservable(): Observable<Download> {
return downloadQueue.getStatusObservable()
.startWith(downloadQueue.getActiveDownloads())
.observeOn(AndroidSchedulers.mainThread())
.subscribe { processStatus(it, view) }
}
add(statusSubscription)
pageProgressSubscription = downloadQueue.getProgressObservable()
fun getProgressObservable(): Observable<Download> {
return downloadQueue.getProgressObservable()
.onBackpressureBuffer()
.observeOn(AndroidSchedulers.mainThread())
.subscribe { view.onUpdateDownloadedPages(it) }
add(pageProgressSubscription)
}
override fun onDropView() {
destroySubscriptions()
super.onDropView()
}
/**
* Process the status of a download when its status has changed and notify the view.
*
* @param download the download whose status has changed.
* @param view the view.
*/
private fun processStatus(download: Download, view: DownloadFragment) {
when (download.status) {
Download.DOWNLOADING -> {
observeProgress(download, view)
// Initial update of the downloaded pages
view.onUpdateDownloadedPages(download)
}
Download.DOWNLOADED -> {
unsubscribeProgress(download)
view.onUpdateProgress(download)
view.onUpdateDownloadedPages(download)
}
Download.ERROR -> unsubscribeProgress(download)
}
}
/**
* Observe the progress of a download and notify the view.
*
* @param download the download to observe its progress.
* @param view the view.
*/
private fun observeProgress(download: Download, view: DownloadFragment) {
val subscription = Observable.interval(50, TimeUnit.MILLISECONDS, Schedulers.newThread())
// Get the sum of percentages for all the pages.
.flatMap {
Observable.from(download.pages)
.map { it.progress }
.reduce { x, y -> x + y }
}
// Keep only the latest emission to avoid backpressure.
.onBackpressureLatest()
.observeOn(AndroidSchedulers.mainThread())
.subscribe { progress ->
// Update the view only if the progress has changed.
if (download.totalProgress != progress) {
download.totalProgress = progress
view.onUpdateProgress(download)
}
}
// Avoid leaking subscriptions
progressSubscriptions.remove(download)?.unsubscribe()
progressSubscriptions.put(download, subscription)
}
/**
* Unsubscribes the given download from the progress subscriptions.
*
* @param download the download to unsubscribe.
*/
private fun unsubscribeProgress(download: Download) {
progressSubscriptions.remove(download)?.unsubscribe()
}
/**
* Destroys all the subscriptions of the presenter.
*/
private fun destroySubscriptions() {
for (subscription in progressSubscriptions.values) {
subscription.unsubscribe()
}
progressSubscriptions.clear()
remove(pageProgressSubscription)
remove(statusSubscription)
}
/**