/** 停止所有任务 */
public void stopAllTask() {
// 从下载队列移除
for (Map.Entry<String, DownloadHttpTask> entry : mDownloadingTaskMap.entrySet()) {
DownloadHttpTask task = entry.getValue();
task.setInterrupt(true);
}
mDownloadingTaskMap.clear();
Iterator<DownloadInfo> downloadingIt = mDownloadingTasks.iterator();
while (downloadingIt.hasNext()) {
DownloadInfo b = downloadingIt.next();
b.setState(DownloadInfo.PAUSE);
downloadingIt.remove();
mPausingTasks.add(b); // 放入暂停队列
}
mDownloadingTasks.clear();
// 从等待队列移除
Iterator<DownloadInfo> waitIt = mWaitTasks.iterator();
while (waitIt.hasNext()) {
DownloadInfo b = waitIt.next();
b.setState(DownloadInfo.PAUSE);
waitIt.remove();
mPausingTasks.add(b); // 放入暂停队列
break;
}
mWaitTasks.clear();
}
/**
* 重新下载
*
* @param url
*/
public void restartTask(String url) {
Iterator<DownloadInfo> pauseIt = mPausingTasks.iterator();
if (mPausingTasks.size() > 0) {
synchronized (mIteratorLock) {
while (pauseIt.hasNext()) {
DownloadInfo downloadInfo = pauseIt.next();
if (TextUtils.equals(downloadInfo.getUrl(), url)) {
if (mDownloadingTasks.size() < MAX_DOWNLOAD_COUNT) {
downloadInfo.setState(DownloadInfo.DOWNLOADING);
DownloadHttpTask task =
new DownloadHttpTask(downloadInfo, mDownloadUIHandler, mDbHelper, this);
mDownloadingTaskMap.put(url, task);
mDownloadingTasks.add(downloadInfo);
pauseIt.remove();
task.start();
} else {
downloadInfo.setState(DownloadInfo.WAIT);
mWaitTasks.offer(downloadInfo);
pauseIt.remove();
}
return;
}
}
}
} else {
stopTask(url);
restartTask(url);
}
}
/**
* 下载一个任务
*
* @param url
* @param listener
*/
public void addTask(String url, DownloadListener listener) {
if (StringUtils.isEmpty(url)) {
Logger.d("download url null");
return;
}
DownloadInfo downloadInfo = new DownloadInfo();
downloadInfo.setUrl(url);
if (!hasTask(url)) {
downloadInfo.setTargetFolder(mTargetFolder);
try {
mDbHelper.save(downloadInfo);
} catch (DbException e) {
Logger.e(e);
}
if (mDownloadingTasks.size() < MAX_DOWNLOAD_COUNT) {
downloadInfo.setState(DownloadInfo.DOWNLOADING);
mDownloadingTasks.add(downloadInfo);
DownloadHttpTask task =
new DownloadHttpTask(downloadInfo, mDownloadUIHandler, mDbHelper, this);
mDownloadingTaskMap.put(url, task);
task.start();
} else { // 加入等待队列
downloadInfo.setState(DownloadInfo.WAIT);
boolean b = mWaitTasks.offer(downloadInfo);
if (b) {
addTaskListener(url, listener);
}
}
mAllTasks.add(downloadInfo);
} else {
Logger.d("任务已存在");
}
}
@Override
public void nextTask() {
synchronized (mNextTaskLockObj) {
if (!mNextTaskLock) {
mNextTaskLock = true;
// TODO mDownloadingTasks 同步状态(临时解决方案)
synchronized (mIteratorLock) {
Iterator<DownloadInfo> downloadingIt = mDownloadingTasks.iterator();
while (downloadingIt.hasNext()) {
DownloadInfo b = downloadingIt.next();
if (b.getState() == DownloadInfo.PAUSE) {
mPausingTasks.add(b);
try {
downloadingIt.remove();
} catch (Exception e) {
Logger.e(e);
}
} else if (b.getState() == DownloadInfo.COMPLETE) {
mCompleteTasks.add(b);
try {
downloadingIt.remove();
} catch (Exception e) {
Logger.e(e);
}
}
}
}
synchronized (mIteratorLock) {
Iterator<Map.Entry<String, DownloadHttpTask>> downloadinMapIt =
mDownloadingTaskMap.entrySet().iterator();
while (downloadinMapIt.hasNext()) {
Map.Entry<String, DownloadHttpTask> entry = downloadinMapIt.next();
DownloadHttpTask task = entry.getValue();
if (task != null && task.isInterrupt()) {
try {
downloadinMapIt.remove();
} catch (Exception e) {
Logger.e(e);
}
}
}
}
executeNextTask();
mNextTaskLock = false;
}
}
}
private void executeNextTask() {
if (mDownloadingTasks.size() < MAX_DOWNLOAD_COUNT) {
if (mWaitTasks.size() > 0) {
DownloadInfo downloadInfo = mWaitTasks.poll();
if (downloadInfo != null) {
String url = downloadInfo.getUrl();
downloadInfo.setState(DownloadInfo.DOWNLOADING);
DownloadHttpTask task =
new DownloadHttpTask(downloadInfo, mDownloadUIHandler, mDbHelper, this);
mDownloadingTaskMap.put(url, task);
task.start();
}
}
} else {
Logger.d("已达到最大下载数量：" + mDownloadingTasks.size());
}
}
private synchronized void removeDownloadingMap(String url) {
synchronized (mIteratorLock) {
Iterator<Map.Entry<String, DownloadHttpTask>> it = mDownloadingTaskMap.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, DownloadHttpTask> entry = it.next();
String key = entry.getKey();
DownloadHttpTask task = entry.getValue();
if (TextUtils.equals(key, url)) {
if (task != null) {
task.setInterrupt(true);
}
try {
it.remove();
} catch (Exception e) {
Logger.e(e);
}
break;
}
}
}
}
