private void tableSelectionChanged() {
if (selectedDownload != null) selectedDownload.deleteObserver(DownloadGUI.this);
if (!clearing && table.getSelectedRow() > -1) {
selectedDownload = tableModel.getDownload(table.getSelectedRow());
selectedDownload.addObserver(DownloadGUI.this);
updateButtons();
}
}
/**
* Update the progress bar of the currently downloaded file in main window. Only update if progess
* has at least increased by one percent of the total file size of the downloaded file.
*
* @param downloadedBytes The current amount of downloaded bytes
* @param lastProgBarUpdate The byte count at the last progress bar update
* @param file The download file
* @return The byte count at the last progress bar update
*/
private int updateProgressBar(int downloadedBytes, int lastProgBarUpdate, DownloadFile file) {
int totalSize = (int) file.getTotalFileSize();
// only update progess bar if progess has at least increased by one percent
int diff = downloadedBytes - lastProgBarUpdate;
int onePercent = (int) totalSize / 100;
if (diff >= onePercent) {
final String filename = file.getFilename();
final int db = downloadedBytes;
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
mainApp.updateDownloadQueue(filename, db);
}
});
return downloadedBytes; // prog bar updated, so return the new byte count
}
return lastProgBarUpdate; // no update, so return the previous byte count
}
private void updateButtons() {
if (selectedDownload != null) {
int status = selectedDownload.getStatus();
switch (status) {
case DownloadFile.DOWNLOADING:
pauseButton.setEnabled(true);
resumeButton.setEnabled(false);
cancelButton.setEnabled(true);
clearButton.setEnabled(false);
break;
case DownloadFile.PAUSED:
pauseButton.setEnabled(false);
resumeButton.setEnabled(true);
cancelButton.setEnabled(true);
clearButton.setEnabled(false);
break;
case DownloadFile.ERROR:
pauseButton.setEnabled(false);
resumeButton.setEnabled(true);
cancelButton.setEnabled(false);
clearButton.setEnabled(true);
break;
default:
pauseButton.setEnabled(false);
resumeButton.setEnabled(false);
cancelButton.setEnabled(false);
clearButton.setEnabled(true);
}
} else {
pauseButton.setEnabled(false);
resumeButton.setEnabled(false);
cancelButton.setEnabled(false);
clearButton.setEnabled(false);
}
}
public void update(Observable o, Object arg) {
if (selectedDownload != null && selectedDownload.equals(o)) updateButtons();
}
private void actionCancel() {
selectedDownload.cancel();
updateButtons();
}
private void actionResume() {
selectedDownload.resume();
updateButtons();
}
private void actionPause() {
selectedDownload.pause();
updateButtons();
}
/** This method starts the thread and begins to download the file. */
public void run() {
int maxThreads = Integer.parseInt(mainApp.getPrefValue("ServerSettingsThreadCount"));
int runningThreads = 0;
HashMap<String, Integer> downloadedBytes = new HashMap<String, Integer>();
HashMap<String, Integer> lastProgBarUpdate = new HashMap<String, Integer>();
// loop at all segments of the download file
while (!shutdown && (segQueue.hasMoreSegments() || runningThreads > 0)) {
// more segments to go?
while (segQueue.hasMoreSegments()
&& runningThreads < maxThreads
&& !pause
&& nioClient.hasFreeSlot()) {
// get next download segment of the download file
DownloadFileSegment seg = segQueue.nextSegment();
if (seg == null) break;
String filename = seg.getDlFile().getFilename();
logger.msg("Downloading next segment of file: " + filename, MyLogger.SEV_DEBUG);
// create new response handler
RspHandler newHandler = new RspHandler(seg);
activeRspHandlers.add(newHandler);
// map the new response handler to the download file
Vector<RspHandler> tmpVector = dlFileRspHandlerMap.get(seg.getDlFile());
if (tmpVector == null) tmpVector = new Vector<RspHandler>();
tmpVector.add(newHandler);
dlFileRspHandlerMap.put(seg.getDlFile(), tmpVector);
// start data download
nioClient.fetchArticleData(seg.getGroups().firstElement(), seg.getArticleId(), newHandler);
// increase thread counter
runningThreads++;
}
// check if the next element of the result set is already finished
Vector<RspHandler> toRemoveVector = new Vector<RspHandler>();
for (int i = 0; i < activeRspHandlers.size(); i++) {
RspHandler handler = activeRspHandlers.get(i);
// handle error response from NNTP server
if (handler.getError() == RspHandler.ERR_NONE) {
// no error, do nothing
} else if (handler.getError() == RspHandler.ERR_AUTH) {
// do nothing for this error (?)
} else if (handler.getError() == RspHandler.ERR_FETCH) {
// TODO: handle "430 no such article" error (?)
String msg =
"no such article found: <"
+ handler.dlFileSeg().getArticleId()
+ "> ("
+ handler.getErrorMsg()
+ ")";
logger.msg(msg, MyLogger.SEV_WARNING);
} else {
// all other errors
shutdown = true;
}
// update downloaded byte counter ...
DownloadFile dlFile = handler.dlFileSeg().getDlFile();
String filename = dlFile.getFilename();
int bytes = 0;
Integer bytesInt = downloadedBytes.get(filename);
if (bytesInt != null) bytes = bytesInt;
bytes += handler.newByteCount();
downloadedBytes.put(filename, bytes);
// ... and progres bar in main window
int last = 0;
Integer lastInt = lastProgBarUpdate.get(filename);
if (lastInt != null) last = lastInt;
last = updateProgressBar(bytes, last, dlFile);
lastProgBarUpdate.put(filename, last);
// all data downloaded?
if (handler.isFinished()) {
toRemoveVector.add(handler);
runningThreads--;
decrSegCount(filename); // decrease main window segment
// counter
// segment done, so check if whole download file is finished
// now
dlFile.removeSegment(handler.dlFileSeg().getIndex());
if (!dlFile.hasMoreSegments()) {
try {
handleFinishedDlFile(dlFile);
} catch (Exception e) {
logger.printStackTrace(e);
}
}
}
}
activeRspHandlers.removeAll(toRemoveVector);
toRemoveVector.removeAllElements();
// all tasks done?
if (!segQueue.hasMoreSegments() && runningThreads == 0) {
break;
}
try {
// let the thread sleep a bit
Thread.sleep(10);
} catch (InterruptedException e) {
// shutdown if interrupted
shutdown = true;
}
} // end of main loop
logger.msg("FileDownloader has finished downloading all files", MyLogger.SEV_DEBUG);
}
/**
* This method is called when a whole download file has been finished downloading. It updates main
* application window and starts the decoding thread.
*
* @param dlFile The DownloadFile object that is finished
*/
private void handleFinishedDlFile(final DownloadFile dlFile) {
final String filename = dlFile.getFilename();
logger.msg("File downloading finished: " + filename, MyLogger.SEV_INFO);
// notify application that download has finished
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
mainApp.fileDownloadFinished(filename);
mainApp.setProgBarToDecoding(filename, dlFile.getSegCount());
}
});
// create result vector
Vector<byte[]> articleData = new Vector<byte[]>();
Vector<RspHandler> rspHandlers = dlFileRspHandlerMap.get(dlFile);
for (int i = 0; i < rspHandlers.size(); i++) {
byte[] tmpArray = removeFirstLine(rspHandlers.get(i).getData(true));
articleData.add(tmpArray);
rspHandlers.set(i, null); // free some memory
}
// call garbage collector
rspHandlers = null;
dlFileRspHandlerMap.remove(dlFile);
Runtime.getRuntime().gc();
logger.msg(
"First line(s) dump:\n" + HelloNzbToolkit.firstLineFromByteData(articleData.get(0), 2),
MyLogger.SEV_DEBUG);
// determine data encoding (yenc or UU)
String encoding = null;
boolean bHasData = false;
for (int i = 0; i < articleData.size(); i++) {
byte[] abyteHelp = articleData.get(i);
if (abyteHelp.length > 0) {
bHasData = true;
if (bytesEqualsString(abyteHelp, "=ybegin")) {
encoding = "yenc";
break;
} else if (bytesEqualsString(abyteHelp, "begin ")) {
encoding = "uu";
break;
}
}
}
if (encoding == null) {
if (bHasData) {
encoding = "yenc";
logger.msg(
"No suitable decoder (no data) found for downloaded file: "
+ dlFile.getFilename()
+ " -- Assuming yenc.",
MyLogger.SEV_WARNING);
} else {
// too bad, no decoder found for this file :(
logger.msg(
"No suitable decoder found for downloaded file (no data): " + dlFile.getFilename(),
MyLogger.SEV_ERROR);
// update main application window
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
mainApp.fileDecodingFinished(dlFile.getFilename());
}
});
return;
}
}
/*
* // determine data encoding String encoding = null;
* if(bytesEqualsString(articleData.get(0), "=ybegin")) encoding =
* "yenc"; else if(bytesEqualsString(articleData.get(0), "begin "))
* encoding = "uu"; else { // too bad, no decoder found for this file :(
* logger.msg("No suitable decoder found for downloaded file: " +
* dlFile.getFilename(), MyLogger.SEV_ERROR);
*
* // update main application window SwingUtilities.invokeLater(new
* Runnable() { public void run() {
* mainApp.fileDecodingFinished(dlFile.getFilename()); } } );
*
* return; }
*/
// start data decoding background thread
FileDecoder fileDecoder = new FileDecoder(mainApp, dlDir, dlFile, articleData, encoding);
Thread t = new Thread(fileDecoder);
t.start();
}
