/**
* 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");
}
}
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());
}
}