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Improve Loading Speed When Skipping Pages in a Chapter (#2426)

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* cancel queued loads when the page that requested the queue is destroyed

* use page.status for optimizing removal

(cherry picked from commit dd1e6402c9)
This commit is contained in:
MCAxiaz 2020-01-05 09:18:02 -08:00 committed by arkon
parent aa57b1bc77
commit cae04656b9
1 changed files with 44 additions and 29 deletions
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39
app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/HttpPageLoader.kt
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@ -17,6 +17,7 @@ import uy.kohesive.injekt.Injekt
import uy.kohesive.injekt.api.get
import java.util.concurrent.PriorityBlockingQueue
import java.util.concurrent.atomic.AtomicInteger
import kotlin.math.min
/**
* Loader used to load chapters from an online source.
@ -37,6 +38,8 @@ class HttpPageLoader(
*/
private val subscriptions = CompositeSubscription()
private val preloadSize = 4
init {
subscriptions += Observable.defer { Observable.just(queue.take().page) }
.filter { it.status == Page.QUEUE }
@ -110,28 +113,40 @@ class HttpPageLoader(
val statusSubject = SerializedSubject(PublishSubject.create<Int>())
page.setStatusSubject(statusSubject)
val queuedPages = mutableListOf<PriorityPage>()
if (page.status == Page.QUEUE) {
queue.offer(PriorityPage(page, 1))
queuedPages += PriorityPage(page, 1).also { queue.offer(it) }
}
preloadNextPages(page, 4)
queuedPages += preloadNextPages(page, preloadSize)
statusSubject.startWith(page.status)
.doOnUnsubscribe {
queuedPages.forEach {
if (it.page.status == Page.QUEUE) {
queue.remove(it)
}
}
}
}
.subscribeOn(Schedulers.io())
.unsubscribeOn(Schedulers.io())
}
/**
* Preloads the given [amount] of pages after the [currentPage] with a lower priority.
* @return a list of [PriorityPage] that were added to the [queue]
*/
private fun preloadNextPages(currentPage: ReaderPage, amount: Int) {
private fun preloadNextPages(currentPage: ReaderPage, amount: Int): List<PriorityPage> {
val pageIndex = currentPage.index
val pages = currentPage.chapter.pages ?: return
if (pageIndex == pages.lastIndex) return
val nextPages = pages.subList(pageIndex + 1, Math.min(pageIndex + 1 + amount, pages.size))
for (nextPage in nextPages) {
if (nextPage.status == Page.QUEUE) {
queue.offer(PriorityPage(nextPage, 0))
}
val pages = currentPage.chapter.pages ?: return emptyList()
if (pageIndex == pages.lastIndex) return emptyList()
return pages
.subList(pageIndex + 1, min(pageIndex + 1 + amount, pages.size))
.mapNotNull {
if (it.status == Page.QUEUE) {
PriorityPage(it, 0).apply { queue.offer(this) }
} else null
}
}
@ -148,7 +163,7 @@ class HttpPageLoader(
/**
* Data class used to keep ordering of pages in order to maintain priority.
*/
private data class PriorityPage(
private class PriorityPage(
val page: ReaderPage,
val priority: Int
): Comparable<PriorityPage> {