feat: 优化代码

app/src/main/java/io/legado/app/data/dao/BookChapterDao.kt

@@ -19,6 +19,9 @@ interface BookChapterDao {
     @Query("select * from chapters where bookUrl = :bookUrl")
     fun getChapterList(bookUrl: String): List<BookChapter>
 
+    @Query("select * from chapters where bookUrl = :bookUrl and `index` >= :start and `index` <= :end")
+    fun getChapterList(bookUrl: String, start: Int, end: Int): List<BookChapter>
+
     @Query("select * from chapters where bookUrl = :bookUrl and `index` = :index")
     fun getChapter(bookUrl: String, index: Int): BookChapter?
 

app/src/main/java/io/legado/app/data/entities/BookChapter.kt

@@ -52,5 +52,16 @@ data class BookChapter(
         variable = GSON.toJson(variableMap)
     }
 
+    override fun hashCode(): Int {
+        return url.hashCode()
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other is BookChapter) {
+            return other.url == url
+        }
+        return false
+    }
+
 }
 

app/src/main/java/io/legado/app/service/DownloadService.kt

@@ -6,9 +6,10 @@ import androidx.core.app.NotificationCompat
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.BaseService
-import io.legado.app.constant.IntentAction
 import io.legado.app.constant.AppConst
 import io.legado.app.constant.EventBus
+import io.legado.app.constant.IntentAction
+import io.legado.app.data.entities.BookChapter
 import io.legado.app.help.AppConfig
 import io.legado.app.help.BookHelp
 import io.legado.app.help.IntentHelp
@@ -17,6 +18,7 @@ import io.legado.app.model.WebBook
 import io.legado.app.utils.postEvent
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.asCoroutineDispatcher
+import org.jetbrains.anko.toast
 import java.util.concurrent.Executors
 
 class DownloadService : BaseService() {
@@ -25,6 +27,8 @@ class DownloadService : BaseService() {
     private var tasks: ArrayList<Coroutine<*>> = arrayListOf()
     private val handler = Handler()
     private var runnable: Runnable = Runnable { upDownload() }
+    private val downloadMap = hashMapOf<String, LinkedHashSet<BookChapter>>()
+    private val finalMap = hashMapOf<String, LinkedHashSet<BookChapter>>()
     private var notificationContent = "正在启动下载"
     private val notificationBuilder by lazy {
         val builder = NotificationCompat.Builder(this, AppConst.channelIdDownload)
@@ -48,7 +52,7 @@ class DownloadService : BaseService() {
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         intent?.action?.let { action ->
             when (action) {
-                IntentAction.start -> download(
+                IntentAction.start -> addDownloadData(
                     intent.getStringExtra("bookUrl"),
                     intent.getIntExtra("start", 0),
                     intent.getIntExtra("end", 0)
@@ -67,14 +71,32 @@ class DownloadService : BaseService() {
         postEvent(EventBus.UP_DOWNLOAD, false)
     }
 
-    private fun download(bookUrl: String?, start: Int, end: Int) {
-        if (bookUrl == null) return
-        val task = Coroutine.async(this) {
-            val book = App.db.bookDao().getBook(bookUrl) ?: return@async
-            val bookSource = App.db.bookSourceDao().getBookSource(book.origin) ?: return@async
+    private fun addDownloadData(bookUrl: String?, start: Int, end: Int) {
+        bookUrl ?: return
+        if (downloadMap.containsKey(bookUrl)) {
+            toast("该书已在下载列表")
+            return
+        }
+        execute {
+            val chapterMap = downloadMap[bookUrl] ?: linkedSetOf<BookChapter>().apply {
+                downloadMap[bookUrl] = this
+            }
+            App.db.bookChapterDao().getChapterList(bookUrl, start, end).let {
+                chapterMap.addAll(it)
+            }
+            download()
+        }
+    }
+
+    private fun download() {
+        val task = Coroutine.async(this, context = searchPool) {
+            downloadMap.forEach { entry ->
+                if (!finalMap.containsKey(entry.key)) {
+                    val book = App.db.bookDao().getBook(entry.key) ?: return@async
+                    val bookSource =
+                        App.db.bookSourceDao().getBookSource(book.origin) ?: return@async
                     val webBook = WebBook(bookSource)
-            for (index in start..end) {
-                App.db.bookChapterDao().getChapter(bookUrl, index)?.let { chapter ->
+                    entry.value.forEach { chapter ->
                         if (!BookHelp.hasContent(book, chapter)) {
                             webBook.getContent(book, chapter, scope = this, context = searchPool)
                                 .onStart {
@@ -85,10 +107,27 @@ class DownloadService : BaseService() {
                                         BookHelp.saveContent(book, chapter, content)
                                     }
                                 }
+                                .onFinally(IO) {
+                                    synchronized(this@DownloadService) {
+                                        val chapterMap =
+                                            finalMap[book.bookUrl]
+                                                ?: linkedSetOf<BookChapter>().apply {
+                                                    finalMap[book.bookUrl] = this
                                                 }
+                                        chapterMap.add(chapter)
+                                        if (chapterMap.size == entry.value.size) {
+                                            downloadMap.remove(book.bookUrl)
+                                            finalMap.remove(book.bookUrl)
                                         }
                                     }
                                 }
+                        }
+                    }
+                }
+
+            }
+        }
+
         tasks.add(task)
         task.invokeOnCompletion {
             tasks.remove(task)