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Simplify PageHolder load Job (#9086)
Inline statusJob into loadJob, using supervisorScope to load the page and track status changes in parallel. - supervisorScope does not complete until both the child loadPage coroutine and statusFlow.collectLatest have completed. - Cancelling supervisorScope cancels the child loadPage coroutine and statusFlow.collectLatest. - Use supervisorScope instead of coroutineScope to let status collection continue if loadPage fails. Inline progressJob into loadJob, using collectLatest's cancellation to avoid cancelling the progressFlow collection explicitly. - collectLatest cancels the previous action block when the flow emits a new value. This means the DOWNLOAD_IMAGE progressFlow.collectLatest gets automatically cancelled when statusFlow emits a new state. Convert launchLoadJob to suspend function, move job launch to caller, and rename as loadPageAndProcessStatus.
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Two-Ai
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2 changed files with 54 additions and 144 deletions
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@ -19,10 +19,12 @@ import kotlinx.coroutines.Job
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import kotlinx.coroutines.MainScope
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import kotlinx.coroutines.flow.collectLatest
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.supervisorScope
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import rx.Observable
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import rx.Subscription
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import rx.android.schedulers.AndroidSchedulers
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import rx.schedulers.Schedulers
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import tachiyomi.core.util.lang.launchIO
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import java.io.BufferedInputStream
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import java.io.ByteArrayInputStream
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import java.io.InputStream
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@ -60,20 +62,10 @@ class PagerPageHolder(
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private val scope = MainScope()
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/**
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* Job for loading the page.
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* Job for loading the page and processing changes to the page's status.
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*/
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private var loadJob: Job? = null
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/**
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* Job for status changes of the page.
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*/
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private var statusJob: Job? = null
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/**
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* Job for progress changes of the page.
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*/
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private var progressJob: Job? = null
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/**
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* Subscription used to read the header of the image. This is needed in order to instantiate
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* the appropiate image view depending if the image is animated (GIF).
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@ -82,7 +74,7 @@ class PagerPageHolder(
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init {
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addView(progressIndicator)
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launchLoadJob()
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loadJob = scope.launch { loadPageAndProcessStatus() }
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}
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/**
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@ -91,73 +83,40 @@ class PagerPageHolder(
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@SuppressLint("ClickableViewAccessibility")
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override fun onDetachedFromWindow() {
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super.onDetachedFromWindow()
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cancelProgressJob()
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cancelLoadJob()
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loadJob?.cancel()
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loadJob = null
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unsubscribeReadImageHeader()
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}
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/**
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* Starts loading the page and processing changes to the page's status.
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* Loads the page and processes changes to the page's status.
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*
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* @see processStatus
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* Returns immediately if the page has no PageLoader.
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* Otherwise, this function does not return. It will continue to process status changes until
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* the Job is cancelled.
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*/
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private fun launchLoadJob() {
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loadJob?.cancel()
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statusJob?.cancel()
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private suspend fun loadPageAndProcessStatus() {
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val loader = page.chapter.pageLoader ?: return
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loadJob = scope.launch {
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supervisorScope {
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launchIO {
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loader.loadPage(page)
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}
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statusJob = scope.launch {
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page.statusFlow.collectLatest { processStatus(it) }
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}
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}
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private fun launchProgressJob() {
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progressJob?.cancel()
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progressJob = scope.launch {
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page.progressFlow.collectLatest { value -> progressIndicator.setProgress(value) }
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}
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}
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/**
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* Called when the status of the page changes.
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*
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* @param status the new status of the page.
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*/
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private fun processStatus(status: Page.State) {
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when (status) {
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page.statusFlow.collectLatest { state ->
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when (state) {
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Page.State.QUEUE -> setQueued()
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Page.State.LOAD_PAGE -> setLoading()
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Page.State.DOWNLOAD_IMAGE -> {
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launchProgressJob()
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setDownloading()
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page.progressFlow.collectLatest { value ->
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progressIndicator.setProgress(value)
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}
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Page.State.READY -> {
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setImage()
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cancelProgressJob()
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}
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Page.State.ERROR -> {
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setError()
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cancelProgressJob()
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Page.State.READY -> setImage()
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Page.State.ERROR -> setError()
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}
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}
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}
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/**
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* Cancels loading the page and processing changes to the page's status.
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*/
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private fun cancelLoadJob() {
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loadJob?.cancel()
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loadJob = null
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statusJob?.cancel()
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statusJob = null
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}
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private fun cancelProgressJob() {
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progressJob?.cancel()
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progressJob = null
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}
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/**
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@ -24,10 +24,12 @@ import kotlinx.coroutines.Job
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import kotlinx.coroutines.MainScope
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import kotlinx.coroutines.flow.collectLatest
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.supervisorScope
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import rx.Observable
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import rx.Subscription
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import rx.android.schedulers.AndroidSchedulers
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import rx.schedulers.Schedulers
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import tachiyomi.core.util.lang.launchIO
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import java.io.BufferedInputStream
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import java.io.InputStream
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@ -77,16 +79,6 @@ class WebtoonPageHolder(
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*/
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private var loadJob: Job? = null
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/**
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* Job for status changes of the page.
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*/
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private var statusJob: Job? = null
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/**
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* Job for progress changes of the page.
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*/
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private var progressJob: Job? = null
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/**
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* Subscription used to read the header of the image. This is needed in order to instantiate
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* the appropriate image view depending if the image is animated (GIF).
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@ -106,7 +98,8 @@ class WebtoonPageHolder(
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*/
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fun bind(page: ReaderPage) {
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this.page = page
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launchLoadJob()
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loadJob?.cancel()
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loadJob = scope.launch { loadPageAndProcessStatus() }
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refreshLayoutParams()
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}
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@ -126,8 +119,8 @@ class WebtoonPageHolder(
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* Called when the view is recycled and added to the view pool.
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*/
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override fun recycle() {
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cancelLoadJob()
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cancelProgressJob()
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loadJob?.cancel()
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loadJob = null
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unsubscribeReadImageHeader()
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removeErrorLayout()
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@ -136,76 +129,34 @@ class WebtoonPageHolder(
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}
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/**
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* Starts loading the page and processing changes to the page's status.
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* Loads the page and processes changes to the page's status.
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*
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* @see processStatus
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* Returns immediately if there is no page or the page has no PageLoader.
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* Otherwise, this function does not return. It will continue to process status changes until
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* the Job is cancelled.
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*/
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private fun launchLoadJob() {
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cancelLoadJob()
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private suspend fun loadPageAndProcessStatus() {
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val page = page ?: return
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val loader = page.chapter.pageLoader ?: return
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loadJob = scope.launch {
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supervisorScope {
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launchIO {
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loader.loadPage(page)
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}
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statusJob = scope.launch {
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page.statusFlow.collectLatest { processStatus(it) }
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}
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}
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/**
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* Observes the progress of the page and updates view.
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*/
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private fun launchProgressJob() {
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cancelProgressJob()
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val page = page ?: return
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progressJob = scope.launch {
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page.progressFlow.collectLatest { value -> progressIndicator.setProgress(value) }
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}
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}
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/**
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* Called when the status of the page changes.
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*
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* @param status the new status of the page.
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*/
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private fun processStatus(status: Page.State) {
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when (status) {
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page.statusFlow.collectLatest { state ->
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when (state) {
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Page.State.QUEUE -> setQueued()
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Page.State.LOAD_PAGE -> setLoading()
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Page.State.DOWNLOAD_IMAGE -> {
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launchProgressJob()
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setDownloading()
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page.progressFlow.collectLatest { value ->
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progressIndicator.setProgress(value)
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}
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Page.State.READY -> {
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setImage()
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cancelProgressJob()
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}
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Page.State.ERROR -> {
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setError()
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cancelProgressJob()
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Page.State.READY -> setImage()
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Page.State.ERROR -> setError()
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}
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}
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}
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/**
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* Cancels loading the page and processing changes to the page's status.
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*/
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private fun cancelLoadJob() {
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loadJob?.cancel()
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loadJob = null
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statusJob?.cancel()
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statusJob = null
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}
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/**
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* Unsubscribes from the progress subscription.
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*/
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private fun cancelProgressJob() {
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progressJob?.cancel()
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progressJob = null
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}
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/**
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