优化代码

Aria/src/main/java/com/arialyy/aria/core/download/DownloadStateConstance.java

@@ -32,8 +32,7 @@ final class DownloadStateConstance {
   boolean isCancel            = false;
   boolean isStop              = false;
 
-  DownloadStateConstance(int num) {
+  DownloadStateConstance() {
-    THREAD_NUM = num;
   }
 
   void cleanState() {

Aria/src/main/java/com/arialyy/aria/core/download/DownloadUtil.java

@@ -39,8 +39,11 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
   /**
    * 线程数
    */
-  private final int THREAD_NUM;
+  private int THREAD_NUM;
-  private static final long SUB_LEN = 1024 * 100;
+  /**
+   * 小于1m的文件不启用多线程
+   */
+  private static final long SUB_LEN = 1024 * 1024;
   //下载监听
   private IDownloadListener mListener;
   private int     mConnectTimeOut     = 5000 * 4; //连接超时时间
@@ -69,7 +72,7 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
     mListener = downloadListener;
     THREAD_NUM = threadNum;
     mFixedThreadPool = Executors.newFixedThreadPool(Integer.MAX_VALUE);
-    mConstance = new DownloadStateConstance(THREAD_NUM);
+    mConstance = new DownloadStateConstance();
     init();
   }
 
@@ -246,9 +249,61 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
    * 处理断点
    */
   private void handleBreakpoint(HttpURLConnection conn) throws IOException {
-
     //不支持断点只能单线程下载
     if (!isSupportBreakpoint) {
+      handleNoSupportBreakpointDownload(conn);
+      return;
+    }
+    int fileLength = conn.getContentLength();
+    if (fileLength < SUB_LEN) {
+      THREAD_NUM = 1;
+      mConstance.THREAD_NUM = THREAD_NUM;
+    }
+    Properties pro = createConfigFile(fileLength);
+    int blockSize = fileLength / THREAD_NUM;
+    int[] recordL = new int[THREAD_NUM];
+    int rl = 0;
+    for (int i = 0; i < THREAD_NUM; i++) {
+      recordL[i] = -1;
+    }
+    for (int i = 0; i < THREAD_NUM; i++) {
+      long startL = i * blockSize, endL = (i + 1) * blockSize;
+      Object state = pro.getProperty(mDownloadFile.getName() + "_state_" + i);
+      if (state != null && Integer.parseInt(state + "") == 1) {  //该线程已经完成
+        if (resumeRecordLocation(i, startL, endL)) return;
+        continue;
+      }
+      //分配下载位置
+      Object record = pro.getProperty(mDownloadFile.getName() + "_record_" + i);
+      //如果有记录，则恢复下载
+      if (!isNewTask && record != null && Long.parseLong(record + "") > 0) {
+        Long r = Long.parseLong(record + "");
+        mConstance.CURRENT_LOCATION += r - startL;
+        Log.d(TAG, "++++++++++ 线程_" + i + "_恢复下载 ++++++++++");
+        mListener.onChildResume(r);
+        startL = r;
+        recordL[rl] = i;
+        rl++;
+      } else {
+        isNewTask = true;
+      }
+      if (isNewTask) {
+        recordL[rl] = i;
+        rl++;
+      }
+      if (i == (THREAD_NUM - 1)) {
+        //如果整个文件的大小不为线程个数的整数倍，则最后一个线程的结束位置即为文件的总长度
+        endL = fileLength;
+      }
+      addSingleTask(i, startL, endL, fileLength);
+    }
+    startSingleTask(recordL);
+  }
+
+  /**
+   * 处理不支持断点的下载
+   */
+  private void handleNoSupportBreakpointDownload(HttpURLConnection conn){
     ConfigEntity entity = new ConfigEntity();
     long len = conn.getContentLength();
     entity.FILE_SIZE = len;
@@ -264,9 +319,13 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
     mFixedThreadPool.execute(task);
     mListener.onPostPre(len);
     mListener.onStart(0);
-      return;
   }
-    int fileLength = conn.getContentLength();
+
+  /**
+   * 创建配置文件
+   */
+  private Properties createConfigFile(long fileLength) throws IOException {
+    Properties pro = null;
     //必须建一个文件
     CommonUtil.createFile(mDownloadFile.getPath());
     BufferedRandomAccessFile file =
@@ -275,7 +334,6 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
     file.setLength(fileLength);
     mListener.onPostPre(fileLength);
     //分配每条线程的下载区间
-    Properties pro = null;
     pro = CommonUtil.loadConfig(mConfigFile);
     if (pro.isEmpty()) {
       isNewTask = true;
@@ -291,16 +349,15 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
         }
       }
     }
-    int blockSize = fileLength / THREAD_NUM;
+    return pro;
-    int[] recordL = new int[THREAD_NUM];
-    int rl = 0;
-    for (int i = 0; i < THREAD_NUM; i++) {
-      recordL[i] = -1;
   }
-    for (int i = 0; i < THREAD_NUM; i++) {
+
-      long startL = i * blockSize, endL = (i + 1) * blockSize;
+  /**
-      Object state = pro.getProperty(mDownloadFile.getName() + "_state_" + i);
+   * 恢复记录地址
-      if (state != null && Integer.parseInt(state + "") == 1) {  //该线程已经完成
+   *
+   * @return true 表示下载完成
+   */
+  private boolean resumeRecordLocation(int i, long startL, long endL) {
     mConstance.CURRENT_LOCATION += endL - startL;
     Log.d(TAG, "++++++++++ 线程_" + i + "_已经下载完成 ++++++++++");
     mConstance.COMPLETE_THREAD_NUM++;
@@ -312,32 +369,15 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
       }
       mListener.onComplete();
       mConstance.isDownloading = false;
-          return;
+      return true;
     }
-        continue;
+    return false;
-      }
-      //分配下载位置
-      Object record = pro.getProperty(mDownloadFile.getName() + "_record_" + i);
-      //如果有记录，则恢复下载
-      if (!isNewTask && record != null && Long.parseLong(record + "") > 0) {
-        Long r = Long.parseLong(record + "");
-        mConstance.CURRENT_LOCATION += r - startL;
-        Log.d(TAG, "++++++++++ 线程_" + i + "_恢复下载 ++++++++++");
-        mListener.onChildResume(r);
-        startL = r;
-        recordL[rl] = i;
-        rl++;
-      } else {
-        isNewTask = true;
-      }
-      if (isNewTask) {
-        recordL[rl] = i;
-        rl++;
-      }
-      if (i == (THREAD_NUM - 1)) {
-        //如果整个文件的大小不为线程个数的整数倍，则最后一个线程的结束位置即为文件的总长度
-        endL = fileLength;
   }
+
+  /**
+   * 创建单线程任务
+   */
+  private void addSingleTask(int i, long startL, long endL, long fileLength) {
     ConfigEntity entity = new ConfigEntity();
     entity.FILE_SIZE = fileLength;
     entity.DOWNLOAD_URL = mDownloadEntity.getDownloadUrl();
@@ -351,6 +391,11 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
     SingleThreadTask task = new SingleThreadTask(mConstance, mListener, entity);
     mTask.put(i, task);
   }
+
+  /**
+   * 启动单线程下载任务
+   */
+  private void startSingleTask(int[] recordL) {
     if (mConstance.CURRENT_LOCATION > 0) {
       mListener.onResume(mConstance.CURRENT_LOCATION);
     } else {
@@ -370,14 +415,14 @@ final class DownloadUtil implements IDownloadUtil, Runnable {
    */
   final static class ConfigEntity {
     //文件大小
-    long FILE_SIZE;
-    String DOWNLOAD_URL;
     int                THREAD_ID;
+    long               FILE_SIZE;
     long               START_LOCATION;
     long               END_LOCATION;
     File               TEMP_FILE;
-    boolean isSupportBreakpoint = true;
+    String             DOWNLOAD_URL;
     String             CONFIG_FILE_PATH;
     DownloadTaskEntity DOWNLOAD_TASK_ENTITY;
+    boolean isSupportBreakpoint = true;
   }
 }