添加下载动态增加文件长度的功能

Aria/src/main/java/com/arialyy/aria/core/ConfigHelper.java

@@ -59,6 +59,9 @@ class ConfigHelper extends DefaultHandler {
 
       String value = attributes.getValue("value");
       switch (qName) {
+        case "useVirtualFile":
+          loadUseVirtualFile(value);
+          break;
         case "threadNum":
           loadThreadNum(value);
           break;
@@ -114,6 +117,12 @@ class ConfigHelper extends DefaultHandler {
     }
   }
 
+  private void loadUseVirtualFile(String value) {
+    if (isDownloadConfig) {
+      mDownloadConfig.useVirtualFile = checkBoolean(value) ? Boolean.valueOf(value) : false;
+    }
+  }
+
   private void loadNotNetRetry(String value) {
     if (isDownloadConfig) {
       mDownloadConfig.notNetRetry = checkBoolean(value) ? Boolean.valueOf(value) : false;

Aria/src/main/java/com/arialyy/aria/core/common/AbsFileer.java

@@ -73,7 +73,7 @@ public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY exte
    * 进度刷新间隔
    */
   private long mUpdateInterval = 1000;
-  private TaskRecord mRecord;
+  protected TaskRecord mRecord;
 
   protected AbsFileer(IEventListener listener, TASK_ENTITY taskEntity) {
     mListener = listener;
@@ -336,6 +336,8 @@ public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY exte
     mRecord.filePath = mTaskEntity.getKey();
     mRecord.threadRecords = new ArrayList<>();
     mRecord.isGroupRecord = mTaskEntity.getEntity().isGroupChild();
+    mRecord.isUseVirtualFile =
+        AriaManager.getInstance(AriaManager.APP).getDownloadConfig().isUseVirtualFile();
     if (mRecord.isGroupRecord) {
       if (mTaskEntity.getEntity() instanceof DownloadEntity) {
         mRecord.dGroupName = ((DownloadEntity) mTaskEntity.getEntity()).getGroupName();

Aria/src/main/java/com/arialyy/aria/core/common/TaskRecord.java

@@ -73,4 +73,10 @@ public class TaskRecord extends DbEntity {
   @Ignore
   @Deprecated
   public String uGroupName;
+
+  /**
+   * 是否是使用虚拟文件下载的
+   * {@code true}是，{@code false}不是
+   */
+  public boolean isUseVirtualFile = false;
 }

Aria/src/main/java/com/arialyy/aria/core/download/downloader/Downloader.java

@@ -40,13 +40,17 @@ class Downloader extends AbsFileer<DownloadEntity, DownloadTaskEntity> {
   Downloader(IDownloadListener listener, DownloadTaskEntity taskEntity) {
     super(listener, taskEntity);
     mTempFile = new File(mEntity.getDownloadPath());
-    setUpdateInterval(
-        AriaManager.getInstance(AriaManager.APP).getDownloadConfig().getUpdateInterval());
+    AriaManager manager = AriaManager.getInstance(AriaManager.APP);
+    setUpdateInterval(manager.getDownloadConfig().getUpdateInterval());
   }
 
   @Override protected int setNewTaskThreadNum() {
     return
-        mEntity.getFileSize() <= SUB_LEN || mTaskEntity.getRequestType() == AbsTaskEntity.D_FTP_DIR
+        // 小于1m的文件或是任务组的子任务、使用虚拟文件，线程数都是1
+        mEntity.getFileSize() <= SUB_LEN
+            || mTaskEntity.getRequestType() == AbsTaskEntity.D_FTP_DIR
+            || mTaskEntity.getRequestType() == AbsTaskEntity.DG_HTTP
+            || mRecord.isUseVirtualFile
             ? 1
             : AriaManager.getInstance(mContext).getDownloadConfig().getThreadNum();
   }
@@ -57,7 +61,7 @@ class Downloader extends AbsFileer<DownloadEntity, DownloadTaskEntity> {
     try {
       file = new BufferedRandomAccessFile(new File(mTempFile.getPath()), "rwd", 8192);
       //设置文件长度
-      file.setLength(mEntity.getFileSize());
+      file.setLength(mRecord.isUseVirtualFile ? 1 : mEntity.getFileSize());
       return true;
     } catch (IOException e) {
       failDownload("下载失败【downloadUrl:"

Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpThreadTask.java

@@ -28,7 +28,6 @@ import com.arialyy.aria.util.CommonUtil;
 import java.io.BufferedInputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.RandomAccessFile;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
@@ -39,6 +38,11 @@ import java.net.URL;
  */
 final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEntity> {
   private final String TAG = "HttpThreadTask";
+  /**
+   * 2M的动态长度
+   */
+  private final int LEN_INTERVAL = 1024 * 1024 * 2;
+  private boolean useVirtualFile = false;
 
   HttpThreadTask(StateConstance constance, IDownloadListener listener,
       SubThreadConfig<DownloadTaskEntity> downloadInfo) {
@@ -48,6 +52,7 @@ final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEnt
     mReadTimeOut = manager.getDownloadConfig().getIOTimeOut();
     mBufSize = manager.getDownloadConfig().getBuffSize();
     isNotNetRetry = manager.getDownloadConfig().isNotNetRetry();
+    useVirtualFile = STATE.TASK_RECORD.isUseVirtualFile;
     setMaxSpeed(manager.getDownloadConfig().getMaxSpeed());
   }
 
@@ -143,6 +148,11 @@ final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEnt
       if (mSleepTime > 0) {
         Thread.sleep(mSleepTime);
       }
+      if (useVirtualFile) {
+        file.setLength(
+            STATE.CURRENT_LOCATION + LEN_INTERVAL < mEntity.getFileSize() ? STATE.CURRENT_LOCATION
+                + LEN_INTERVAL : mEntity.getFileSize());
+      }
       file.write(buffer, 0, len);
       progress(len);
     }

app/src/main/assets/aria_config.xml

@@ -11,6 +11,12 @@
 
   <!--注意，修改该配置文件中的属性会覆盖代码中所设置的属性-->
   <download>
+    <!--是否使用虚拟文件，使用虚拟文件初始化时将不占用磁盘空间，下载多少byte，占多少空间，效果见chrome的下载。-->
+    <!--注意：
+    1、使用该功能，将自动关闭多线程下载；
+    2、对于已经采用了多线程的任务，依然采用原来的下载方式；
+    3、原本参数是true，任务没下载完成，就参数改为false，那么没下载完成的任务还是会按照参数修改前的方式下载；只有新任务才会根据参数调用不同的下载方式。-->
+    <useVirtualFile value="true"/>
 
     <!--断网的时候是否重试，true：断网也重试；false：断网不重试，直接走失败的回调-->
     <notNetRetry value="true"/>

app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java

@@ -18,8 +18,8 @@ public class AnyRunActivity extends BaseActivity<ActivityTestBinding> {
   AnyRunnModule module;
   String[] urls;
   int index = 0;
-  //String URL = "http://static.gaoshouyou.com/d/12/0d/7f120f50c80d2e7b8c4ba24ece4f9cdd.apk";
-  String URL = "http://static.gaoshouyou.com/d/22/94/822260b849944492caadd2983f9bb624.apk";
+  String URL = "http://static.gaoshouyou.com/d/12/0d/7f120f50c80d2e7b8c4ba24ece4f9cdd.apk";
+  //String URL = "http://static.gaoshouyou.com/d/22/94/822260b849944492caadd2983f9bb624.apk";
   //String URL = "https://dl.genymotion.com/releases/genymotion-2.12.1/genymotion-2.12.1-vbox.exe";
 
   @Override protected int setLayoutId() {

aria/src/main/java/com/arialyy/aria/core/Configuration.java

@@ -374,6 +374,26 @@ class Configuration {
      */
     int maxSpeed = 0;
 
+    /**
+     * 是否使用虚拟文件，使用虚拟文件初始化时将不占用磁盘空间，下载多少byte，占多少空间，效果见chrome的下载。
+     * 注意：
+     * 1、使用该功能，将自动关闭多线程下载；
+     * 2、对于已经采用了多线程的任务，依然采用原来的下载方式；
+     * 3、原本参数是true，任务没下载完成，就参数改为false，那么没下载完成的任务还是会按照参数修改前的方式下载，只有新任务才会根据参数调用不同的下载方式
+     * {@code true}使用
+     */
+    boolean useVirtualFile = true;
+
+    public DownloadConfig setuseVirtualFile(boolean useVirtualFile) {
+      this.useVirtualFile = useVirtualFile;
+      saveKey("useVirtualFile", String.valueOf(useVirtualFile));
+      return this;
+    }
+
+    public boolean isUseVirtualFile() {
+      return useVirtualFile;
+    }
+
     public DownloadConfig setMaxTaskNum(int maxTaskNum) {
       oldMaxTaskNum = this.maxTaskNum;
       this.maxTaskNum = maxTaskNum;