private void _start() {
try {
// Whether service was already started.
if (!_checkCanStart()) {
// Not ready
return;
}
FileDownloadList.getImpl().add(this);
if (_checkCanReuse()) {
// Will be removed when the complete message is received in #update
return;
}
if (FileDownloadLog.NEED_LOG) {
FileDownloadLog.d(this, "start downloaded by ui process %s", getUrl());
}
if (!_startExecute()) {
setEx(new RuntimeException("not run download, not got download id"));
FileDownloadList.getImpl().removeByError(this);
}
} catch (Throwable e) {
e.printStackTrace();
setEx(e);
FileDownloadList.getImpl().removeByError(this);
}
}
/**
* start download
*
* <p>用于启动一个单独任务
*
* @return Download id
*/
public int start() {
if (FileDownloadMonitor.isValid()) {
FileDownloadMonitor.getMonitor().onRequestStart(this);
}
if (FileDownloadLog.NEED_LOG) {
FileDownloadLog.v(
this,
"call start " + "url[%s], setPath[%s] listener[%s], tag[%s]",
url,
path,
listener,
tag);
}
boolean ready = true;
try {
_adjust();
_checkFile(path);
} catch (Throwable e) {
ready = false;
setStatus(FileDownloadStatus.error);
setEx(e);
FileDownloadList.getImpl().add(this);
FileDownloadList.getImpl().removeByError(this);
}
if (ready) {
FileDownloadEventPool.getImpl().send2Service(new DownloadTaskEvent(this).requestStart());
}
return getDownloadId();
}
/** @param transfer In order to optimize some of the data in some cases is not back */
void update(final FileDownloadTransferModel transfer) {
switch (transfer.getStatus()) {
case FileDownloadStatus.pending:
if (getStatus() == FileDownloadStatus.pending) {
FileDownloadLog.w(this, "already pending %d", getDownloadId());
break;
}
this.setStatus(transfer.getStatus());
this.setSoFarBytes(transfer.getSoFarBytes());
this.setTotalBytes(transfer.getTotalBytes());
// notify
getDriver().notifyPending();
break;
case FileDownloadStatus.connected:
if (getStatus() == FileDownloadStatus.connected) {
FileDownloadLog.w(this, "already connected %d", getDownloadId());
break;
}
setStatus(transfer.getStatus());
setTotalBytes(transfer.getTotalBytes());
setSoFarBytes(transfer.getSoFarBytes());
this.isContinue = transfer.isContinue();
this.etag = transfer.getEtag();
// notify
getDriver().notifyConnected();
break;
case FileDownloadStatus.progress:
if (getStatus() == FileDownloadStatus.progress
&& transfer.getSoFarBytes() == getLargeFileSoFarBytes()) {
FileDownloadLog.w(this, "%d unused values! by process callback", getDownloadId());
break;
}
setStatus(transfer.getStatus());
setSoFarBytes(transfer.getSoFarBytes());
// notify
getDriver().notifyProgress();
break;
case FileDownloadStatus.blockComplete:
/** Handled by {@link FileDownloadList#removeByCompleted(BaseDownloadTask)} */
break;
case FileDownloadStatus.retry:
if (getStatus() == FileDownloadStatus.retry
&& getRetryingTimes() == transfer.getRetryingTimes()) {
FileDownloadLog.w(
this,
"%d already retry! %d %d %s",
getDownloadId(),
getRetryingTimes(),
getAutoRetryTimes(),
transfer.getThrowable());
break;
}
setStatus(transfer.getStatus());
setSoFarBytes(transfer.getSoFarBytes());
setEx(transfer.getThrowable());
_setRetryingTimes(transfer.getRetryingTimes());
// notify
getDriver().notifyRetry();
break;
case FileDownloadStatus.error:
if (getStatus() == FileDownloadStatus.error) {
FileDownloadLog.w(
this,
"%d already err(%s) , callback by other status same transfer",
getDownloadId(),
getEx());
break;
}
setStatus(transfer.getStatus());
setEx(transfer.getThrowable());
setSoFarBytes(transfer.getSoFarBytes());
// to FileDownloadList
FileDownloadList.getImpl().removeByError(this);
break;
case FileDownloadStatus.paused:
/** Handled by {@link #pause()} */
break;
case FileDownloadStatus.completed:
if (getStatus() == FileDownloadStatus.completed) {
FileDownloadLog.w(
this,
"%d already completed , callback by process with same transfer",
getDownloadId());
break;
}
this.isReusedOldFile = transfer.isUseOldFile();
setStatus(transfer.getStatus());
// only carry total data back
setSoFarBytes(transfer.getTotalBytes());
setTotalBytes(transfer.getTotalBytes());
// to FileDownloadList
FileDownloadList.getImpl().removeByCompleted(this);
break;
case FileDownloadStatus.warn:
if (getStatus() == FileDownloadStatus.warn) {
FileDownloadLog.w(
this, "%d already warn , callback by process with same transfer", getDownloadId());
break;
}
final int count = FileDownloadList.getImpl().count(getDownloadId());
if (count <= 1) {
// 1. this progress kill by sys and relive,
// for add at least one listener
// or 2. pre downloading task has already completed/error/paused
// request status
final int currentStatus = _getStatusFromServer(downloadId);
FileDownloadLog.w(
this,
"warn, but no listener to receive progress, " + "switch to pending %d %d",
getDownloadId(),
currentStatus);
if (FileDownloadStatus.isIng(currentStatus)) {
// ing, has callbacks
// keep and wait callback
setStatus(FileDownloadStatus.pending);
getDriver().notifyPending();
break;
} else {
// already over and no callback
}
}
setStatus(transfer.getStatus());
// to FileDownloadList
FileDownloadList.getImpl().removeByWarn(this);
break;
}
}