std::shared_ptr<const DownloadTask> Downloader::createDownloadFileTask(const std::string& srcUrl,
const std::string& storagePath,
const std::string& identifier/* = ""*/)
{
DownloadTask *task_ = new (std::nothrow) DownloadTask();
std::shared_ptr<const DownloadTask> task(task_);
do
{
task_->requestURL = srcUrl;
task_->storagePath = storagePath;
task_->identifier = identifier;
if (0 == srcUrl.length() || 0 == storagePath.length())
{
if (onTaskError)
{
onTaskError(*task, DownloadTask::ERROR_INVALID_PARAMS, 0, "URL or storage path is empty.");
}
task.reset();
break;
}
task_->_coTask.reset(_impl->createCoTask(task));
} while (0);
return task;
}
Downloader::Downloader(const DownloaderHints& hints)
{
DLLOG("Construct Downloader %p", this);
_impl.reset(new DownloaderImpl(hints));
_impl->onTaskProgress = [this](const DownloadTask& task,
int64_t bytesReceived,
int64_t totalBytesReceived,
int64_t totalBytesExpected,
std::function<int64_t(void *buffer, int64_t len)>& transferDataToBuffer)
{
if (onTaskProgress)
{
onTaskProgress(task, bytesReceived, totalBytesReceived, totalBytesExpected);
}
};
_impl->onTaskFinish = [this](const DownloadTask& task,
int errorCode,
int errorCodeInternal,
const std::string& errorStr,
std::vector<unsigned char>& data)
{
if (DownloadTask::ERROR_NO_ERROR != errorCode)
{
if (onTaskError)
{
onTaskError(task, errorCode, errorCodeInternal, errorStr);
}
return;
}
// success callback
if (task.storagePath.length())
{
if (onFileTaskSuccess)
{
onFileTaskSuccess(task);
}
}
else
{
// data task
if (onDataTaskSuccess)
{
onDataTaskSuccess(task, data);
}
}
};
}
void Tasks::exec(Task* t, bool foreground) {
// setup signals
connect(t, SIGNAL(onStart()), this, SLOT(onTaskStart()), Qt::AutoConnection);
connect(t, SIGNAL(onProgress(TaskStatus)), this, SLOT(onTaskProgress(TaskStatus)), Qt::AutoConnection);
connect(t, SIGNAL(onDone()), this, SLOT(onTaskDone()), Qt::AutoConnection);
connect(t, SIGNAL(onError(QString)), this, SLOT(onTaskError(QString)), Qt::AutoConnection);
// run (will trigger start, progress, done)
t->run();
// done
//TaskStatus ts("", 1);
//emit onTaskProgress(ts);
// the task will be deleted, after he sent the onDone() signal
// AND this signal has been processed by the event loop.
// see "Tasks::onTaskDone()" below.
}