Hello guys plz i need your help.

im new in flex mobile app devolopment. i ve problem and couldnt solve for last one week. my problem is, i load html content in one of views and i would like to use busy indicator component till website finishes loading. when i applied busy indicator, as soon as push the view (that html content embedded) busy indicator stays just couple of seconds and disappears after tht white blank screen comes up till website loads. is there anyway to optimize busy indicator till HTML content loads ? im using flex 4.5 thank you very much.

Hi,
Looks like you can use spark range
http://sourceforge.net/adobe/flexsdk/wiki/Spark%20Range/
Source:
http://forums.adobe.com/thread/869489
Best,

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Hi, Gaza898, and welcome to the Community,
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Need your help on performance issue please

Hello everyone!
I need your help to understand an effect I notice with a Thread class I built. I currently work on enhancement of my application Playlist Editor (see http://www.lightdev.com/page74.htm) and a new release will be available soon.
Among other extensions the new release will have a title filter function which is based on audio data that is recursively read from ID3 tags of files found in a given root directory. The data collection is done by a CollectionThread class which reads into a data model class AudioDataModel and the entire process works fine, no problem with that.
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Ulrich
PS: You can use the news subscription service at
http://www.lightdev.com/dynTemplate.php4?id=80&dynPage=subscribe.php4 to be informed when the new release of Playlist Editor is available.
All classes posted here do not need debugging, they already have proven to run error free. The classes are only posted for information for the interested reader - no need to go through all the stuff in detail - only if it interests you.
My application calls class CollectionThread wich is a subclass of InfoThread. CollectionThread recursively goes through a directory and file structure and stores found ID3 tag information in instances of class ID3v11Tag which in turn gets stored in one instance of class AudioDataModel. All classes are shown below.
This is the mentioned CollectionThread
* Light Development Playlist Editor
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.app.playlisteditor.data;
import com.lightdev.lib.util.InfoThread;
import java.io.File;
* A class to collect audio data from a given storage location.
* 
* <code>CollectionThread</code> uses ID3 tag information to gain data.
* 
* See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software as well as any licensing notes
* inside this documentation
* @version 1, October 13, 2004
public class CollectionThread extends InfoThread {
 * constructor
 * @param model AudioDataModel the data model to collect data to
public CollectionThread(AudioDataModel model) {
 this.model = model;
 * constructor, creates a new empty AudioDataModel
public CollectionThread() {
 this(new AudioDataModel());
 * set the data model to collect data to
 * @param model AudioDataModel the model to collect data to
public void setModel(AudioDataModel model) {
 this.model = model;
 * get the data model associated to this thread
 * @return AudioDataModel the data model
public AudioDataModel getModel() {
 return model;
 * set the directory to collect data from
 * @param rootDir File the directory to collect data from
public void setRootDirectory(File rootDir) {
 this.rootDir = rootDir;
 * do te actual work of this thread, i.e. iterate through a given directory
 * structure and collect audio data
 * @return boolean true, if work is left
protected boolean work() {
 boolean workIsLeft = true;
 maxValue = -1;
 filesProcessed = 0;
 if(getStatus() < STATUS_HALT_PENDING) {
 countElements(rootDir.listFiles());
 if(getStatus() < STATUS_HALT_PENDING) {
 workIsLeft = collect(rootDir.listFiles());
 return workIsLeft;
 * count the elements in a given file array including its subdirectories
 * @param files File[]
private void countElements(File[] files) {
 int i = 0;
 while (i < files.length && getStatus() < STATUS_HALT_PENDING) {
 File file = files;
if (file.isDirectory()) {
countElements(file.listFiles());
i++;
maxValue++;
* recursively read data into model
* @param files File[] the file array representing the content of a given directory
private boolean collect(File[] files) {
int i = 0;
while(i < files.length && getStatus() < STATUS_HALT_PENDING) {
File file = files[i];
if(file.isDirectory()) {
collect(file.listFiles());
else if(file.getName().toLowerCase().endsWith("mp3")) {
try {
model.addTrack(file);
catch(Exception e) {
fireThreadException(e);
i++;
filesProcessed++;
fireThreadProgress(filesProcessed);
return (i<files.length);
/** the directory to collect data from */
private File rootDir;
/** the data model to collect data to */
private AudioDataModel model;
/** the number of files this thread processed so far while it is running */
private long filesProcessed = 0;
This is class InfoThread
* Light Development Java Library
* Copyright (C) 2003, 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.util;
import java.util.Vector;
import java.util.Enumeration;
* Abstract class <code>InfoThread</class> implements a status and listener concept.
* An <code>InfoThread</code> object actively informs all objects registered as listeners about
* status changes, progress and possible exceptions. This way the status of a running
* thread does not require a polling mechanism to be monitored.
* 
* <code>InfoThread</code> implements the following working scheme
* 
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public abstract class InfoThread extends Thread {
 * construct an <code>InfoThread</code> object
 * This class is meant to be used when a <code>Thread</code> object is needed that actively
 * informs other objects about its status</code>. It is a good idea therefore to register
 * one or more listeners with instances of this class before doing anything
 * else.
 * @see addInfoThreadListener
public InfoThread() {
 * set the amount of time this thread shall idle after it is through with one
 * work cycle and before a next work cycle is started. This influences the time
 * other threads have for their work.
 * @param millis long the number of milliseconds to idle after one work cycle
public void setIdleMillis(long millis) {
 idleMillis = millis;
 * Causes this thread to begin execution; the Java Virtual Machine calls the <code>run</code>
 * method of this thread. Calls method <code>prepareThread</code> before calling
 * <code>run</code>.
 * @see run
 * @see prepareThread
public synchronized void start() {
 setStatus(STATUS_INITIALIZING);
 prepareThread();
 setStatus(STATUS_READY);
 super.start();
 * call method <code>start</code> instead of this method.
 * calling this method directly will lead to an exception
 * @see start
public void run() {
 //System.out.println("InfoThread.run");
 if (status == STATUS_READY) {
 boolean workIsLeft = true;
 setStatus(STATUS_RUNNING);
 while (status < STATUS_STOP_PENDING && workIsLeft) {
 if (status < STATUS_HALT_PENDING) {
 workIsLeft = work();
 if(!workIsLeft) {
 setStatus(STATUS_WORK_COMPLETE);
 if (status == STATUS_HALT_PENDING) {
 setStatus(STATUS_HALTED);
 else if (status == STATUS_STOP_PENDING) {
 setStatus(STATUS_STOPPED);
 else {
 try {
 sleep(idleMillis);
 catch (InterruptedException e) {
 fireThreadException(e);
 else {
 // error: Thread is not ready to run
 setStatus(STATUS_THREAD_FINISHED);
 * stop this thread. This will terminate the thread irrevokably. Use method
 * <code>haltThread</code> to pause a thread with the possiblity to resume work later.
 * @see haltThread
public void stopThread() {
 switch (status) {
 case STATUS_RUNNING:
 setStatus(STATUS_STOP_PENDING);
 break;
 case STATUS_HALT_PENDING:
 // exception: the thread already is about to halt
 break;
 case STATUS_STOP_PENDING:
 // exception: the thread already is about to stop
 break;
 default:
 // exception: a thread can not be stopped, when it is not running
 break;
 * halt this thread, i.e. pause working allowing to resume later
 * @see resumeThread
public void haltThread() {
 switch (status) {
 case STATUS_RUNNING:
 setStatus(STATUS_STOP_PENDING);
 break;
 case STATUS_HALT_PENDING:
 // exception: the thread already is about to halt
 break;
 case STATUS_STOP_PENDING:
 // exception: the thread already is about to stop
 break;
 default:
 // exception: a thread can not be halted, when it is not running
 break;
 * resume this thread, i.e. resume previously halted work
 * @see haltThread
public void resumeThread() {
 if(status == STATUS_HALTED || status == STATUS_HALT_PENDING) {
 setStatus(STATUS_RUNNING);
 else {
 // exception: only halted threads or threads that are about to halt can be resumed
 * this is the method to prepare a thread to run. It is not implemented in this abstract
 * class. Subclasses of <code>InfoThread</code> can implement this method to do anything
 * that might be required to put their thread into STATUS_READY. This method is called
 * automatically by method <code>start</code>. When implementing this method, it should
 * call method <code>fireThreadException</code> accordingly.
 * @see start
 * @see fireThreadException
protected void prepareThread() {
 // does nothing in this abstract class but might be needed in subclasses
 * this is the main activity method of this object. It is not implemented in this abstract
 * class. Subclasses of <code>InfoThread</code> must implement this method to do something
 * meaningful. When implementing this method, it should call methods
 * <code>fireThreadProgress</code> and <code>fireThreadException</code> accordingly.
 * @return boolean true, if work is left, false if not
 * @see fireThreadProgress
 * @see fireTreadException
protected abstract boolean work();
 * add an <code>InfoTreadListener</code> to this instance of <code>InfoThread</code>
 * @param l InfoThreadListener the listener to add
 * @see removeInfoThreadListener
public void addInfoThreadListener(InfoThreadListener l) {
 listeners.add(l);
 * remove an <code>InfoTreadListener</code> from this instance of <code>InfoThread</code>
 * @param l InfoThreadListener the listener to remove
public void removeInfoThreadListener(InfoThreadListener l) {
 listeners.remove(l);
 * notify all <code>InfoThreadListener</code>s of a status change
 * @param fromStatus int the status tis thread had before the change
 * @param toStatus int the status this thread has now
protected void fireThreadStatusChanged(int fromStatus, int toStatus) {
 Enumeration e = listeners.elements();
 while(e.hasMoreElements()) {
 Object l = e.nextElement();
 if(l instanceof InfoThreadListener) {
 ((InfoThreadListener) l).threadStatusChanged(this, fromStatus, toStatus);
 * notify all <code>InfoThreadListener</code>s of an exception in this thread
 * @param ex Exception the exception that occurred
protected void fireThreadException(Exception ex) {
 Enumeration e = listeners.elements();
 while(e.hasMoreElements()) {
 Object l = e.nextElement();
 if(l instanceof InfoThreadListener) {
 ((InfoThreadListener) l).threadException(this, ex);
 * notify all <code>InfoThreadListener</code>s of the progress of this thread
 * @param progressValue long a value indicating the current thread progress
protected void fireThreadProgress(long progressValue) {
 Enumeration e = listeners.elements();
 while(e.hasMoreElements()) {
 Object l = e.nextElement();
 if(l instanceof InfoThreadListener) {
 ((InfoThreadListener) l).threadProgress(this, progressValue, maxValue);
 * set the status of this thread and notify all listeners
 * @param newStatus int the status this thread is to be changed to
private void setStatus(int newStatus) {
 //System.out.println("InfoThread.setStatus oldStatus=" + status + ", newStatus=" + newStatus);
 int fromStatus = status;
 status = newStatus;
 fireThreadStatusChanged(fromStatus, newStatus);
 * get the current status of this thread
 * @return int the status
public int getStatus() {
 return status;
 * cleanup before actual destruction.
public void destroy() {
 //System.out.println("InfoThread.destroy");
 cleanup();
 super.destroy();
 * cleanup all references this thread maintains
private void cleanup() {
 //System.out.println("InfoThread.cleanup");
 listeners.removeAllElements();
 listeners = null;
/* ----------------------- class fields start ------------------------ */
/** storage for the objects this thread notifies about status changes and progress */
private Vector listeners = new Vector();
/** indicator for the status of this thread */
private int status = STATUS_NONE;
/** maximum value for threadProgress */
protected long maxValue = -1;
/** the idle time inside one work cycle in milliseconds */
protected long idleMillis = 1;
/* ----------------------- class fields end -------------------------- */
/* ----------------------- constants start --------------------------- */
/** constant value indicating that no status has been set so far */
public static final int STATUS_NONE = 0;
/** constant value indicating that the thread is currently initializing */
public static final int STATUS_INITIALIZING = 1;
/** constant value indicating that the thread is ready to run */
public static final int STATUS_READY = 2;
/** constant value indicating that the thread is running */
public static final int STATUS_RUNNING = 3;
/** constant value indicating that the thread is about to halt */
public static final int STATUS_HALT_PENDING = 4;
/** constant value indicating that the thread is halted */
public static final int STATUS_HALTED = 5;
/** constant value indicating that the work of this thread is complete */
public static final int STATUS_WORK_COMPLETE = 6;
/** constant value indicating that the thread is about to stop */
public static final int STATUS_STOP_PENDING = 7;
/** constant value indicating that the thread is stopped */
public static final int STATUS_STOPPED = 8;
/** constant value indicating that the thread is finished */
public static final int STATUS_THREAD_FINISHED = 9;
/* ----------------------- constants end --------------------------- */
}this is the InfoThreadListener interface
* Light Development Java Library
* Copyright (C) 2003, 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.util;
* An interface classes interested to receive events from objects
* of class <code>InfoThread</code> need to implement.
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public interface InfoThreadListener {
 * method to receive a status change notification from a thread
 * @param thread InfoThread the thread which status changed
 * @param fromStatus int the status which the thread had before the change
 * @param toStatus int the status which the thread has now
public void threadStatusChanged(InfoThread thread, int fromStatus, int toStatus);
 * method to receive a notification about the progress of a thread
 * @param thread InfoThread the thread which notified about its progress
 * @param progressValue long the value (e.g. 10 if 100 percent completed, 20 of 1 million files processed, etc.)
public void threadProgress(InfoThread thread, long progressValue, long maxValue);
 * method to receive a notifiaction about the fact that an exception occurred in a thread
 * @param thread InfoThread the thread for which an exception occurred
 * @param e Exception the exception that occurred
public void threadException(InfoThread thread, Exception e);
}This is class AudioFileDescriptor
* Light Development Java Library
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.audio;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.Serializable;
import java.text.DecimalFormat;
* This class models characteristics of an audio file such as the absolute path
* of the file, its tag contents (if any) and the play duration, etc.
* See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public class AudioFileDescriptor implements Serializable, Comparable {
public AudioFileDescriptor(String absolutePath) throws FileNotFoundException, IOException {
 load(absolutePath);
public boolean equals(Object o) {
 if(o != null && o instanceof AudioFileDescriptor) {
 return ((AudioFileDescriptor) o).getAbsolutePath().equalsIgnoreCase(this.getAbsolutePath());
 else {
 return false;
public void load(String absolutePath) throws FileNotFoundException, IOException {
 this.absolutePath = absolutePath;
 RandomAccessFile rf = new RandomAccessFile(absolutePath, "r");
 if(id3v11Tag == null) {
 id3v11Tag = new ID3v11Tag(rf, false);
 else {
 id3v11Tag.readTag(rf, rf.length() - 128);
 rf.close();
public String getAbsolutePath() {
 return absolutePath;
public ID3v11Tag getID3v11Tag() {
 return id3v11Tag;
public void setID3v11Tag(ID3v11Tag tag) {
 this.id3v11Tag = tag;
public String toString() {
 DecimalFormat df = new DecimalFormat("00");
 return id3v11Tag.getArtist() + ", " + id3v11Tag.getAlbum() + " - " +
 df.format(id3v11Tag.getTrackNumber()) + " " + id3v11Tag.getTitle();
 * Compares this object with the specified object for order.
 * @param o the Object to be compared.
 * @return a negative integer, zero, or a positive integer as this object is less than, equal to,
 * or greater than the specified object.
 * @todo Implement this java.lang.Comparable method
public int compareTo(Object o) {
 return toString().compareTo(o.toString());
private String absolutePath;
private ID3v11Tag id3v11Tag;
private transient long duration = -1;
private transient int type = TYPE_UNKNOWN;
public static final transient int TYPE_UNKNOWN = 0;
public static final transient int TYPE_MP3 = 1;
}This is class ID3V11Tag into which the data is actually stored
* Light Development Java Library
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.audio;
import java.io.File;
import java.io.RandomAccessFile;
import java.io.IOException;
import java.io.Serializable;
import java.text.DecimalFormat;
* This class is a very simple implementation of an ID3v11Tag. It models an ID3 tag
* pretty much the same way as it is physically stored inside an audio file.
* See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public class ID3v11Tag implements Serializable, Comparable {
 * construct an ID3v11Tag and read tag content from a given file
 * This constructor can be used for cases where a RandomAccessFile has already
 * been opened and will be closed elsewhere
 * @param rf RandomAccessFile the open file to read from
 * @param isAtTagStartPos boolean true, if the file pointer is at the
 * position where the ID3 tag starts; when false, the pointer is positioned accordingly here
 * @throws IOException
public ID3v11Tag(RandomAccessFile rf, boolean isAtTagStartPos) throws IOException {
 if(isAtTagStartPos) {
 readTag(rf);
 else {
 readTag(rf, rf.length() - 128);
 * construct an ID3v11Tag and read tag content from a file at a given location
 * This constructor opens and closes the audio file for reading
 * @param absolutePath String the absolute path to the audio file to open
 * @throws IOException
public ID3v11Tag(String absolutePath) throws IOException {
 RandomAccessFile rf = new RandomAccessFile(absolutePath, "r");
 readTag(rf, rf.length() - 128);
 rf.close();
 * construct an ID3v11Tag and read tag content from a given file
 * This constructor opens and closes the audio file for reading
 * @param audioFile File the audio file to read from
 * @throws IOException
public ID3v11Tag(File audioFile) throws IOException {
 this(audioFile.getAbsolutePath());
 * get a string representation of this object
 * @return String
public String toString() {
 DecimalFormat df = new DecimalFormat("00");
 return getArtist() + ", " + getAlbum() + " - " + df.format(getTrackNumber()) + " " + getTitle();
 * position to file pointer and read the tag
 * @param rf RandomAccessFile the file to read from
 * @param jumpPos long the position to jump to (the tag start position)
 * @throws IOException
public void readTag(RandomAccessFile rf, long jumpPos) throws IOException {
 rf.seek(jumpPos);
 readTag(rf);
 * read the tag from a given file, assuming the file pointer to be at the tag start position
 * @param rf RandomAccessFile the file to read from
 * @throws IOException
public void readTag(RandomAccessFile rf) throws IOException {
 rf.read(tagBuf);
 if(tag.equalsIgnoreCase(new String(tagBuf))) {
 rf.read(title);
 rf.read(artist);
 rf.read(album);
 rf.read(year);
 rf.read(comment);
 rf.read(trackNo);
 rf.read(genre);
public String getTitle() {
 return new String(title).trim();
public String getArtist() {
 return new String(artist).trim();
public String getAlbum() {
 return new String(album).trim();
public String getYear() {
 return new String(year).trim();
public String getComment() {
 return new String(comment).trim();
public int getGenreId() {
 try {
 int id = new Byte(genre[0]).intValue();
 if(id < GENRE_ID_MIN || id > GENRE_ID_MAX) {
 return GENRE_ID_OTHER;
 else {
 return id;
 catch(Exception ex) {
 return GENRE_ID_OTHER;
public String getGenreName() {
 return genreNames[getGenreId()];
public int getTrackNumber() {
 try {
 return (int) trackNo[0];
 catch(Exception e) {
 return 0;
 * Compares this object with the specified object for order.
 * @param o the Object to be compared.
 * @return a negative integer, zero, or a positive integer as this object is less than, equal to,
 *

Hi Franck,
thank you, mate. I did what you suggested (changed class attached) but that did not change the mentioned behaviour.
The first run is approximately 75 seconds with Java option -Xms40m and approx. double without, the second run and all subsequent runs are only 2-3 seconds each (!!!) even when terminating and re-starting the application between thread runs.
I'm pretty clueless about that, any more help on this anyone?
Thanks a lot and best regards
Ulrich
PS: BTW, I forgot to post the class that is filled with data by class CollectionThread, so here it is
* Light Development Playlist Editor
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.app.playlisteditor.data;
import java.io.File;
import com.lightdev.lib.audio.ID3v11Tag;
import javax.sound.sampled.UnsupportedAudioFileException;
import java.io.IOException;
import java.io.Serializable;
import com.lightdev.lib.audio.AudioFileDescriptor;
import com.lightdev.lib.ui.SortListModel;
import java.util.Iterator;
* Storage model for audio data.
* 
* <code>AudioDataModel</code> can be used to store ID3 tag data collected from
* a directory with audio files to perform queries and reports on the found data.
* 
* See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software as well as any licensing notes
* inside this documentation
* @version 1, October 15, 2004
public class AudioDataModel extends SortListModel implements Serializable {
 * constructor
public AudioDataModel() {
 * add an audio track from a given audio file
 * This will attempt to read ID3 tag data from the file.
 * @param audioFile File the file to add audio data for
 * @throws IOException
public void addTrack(File audioFile) throws IOException {
 AudioFileDescriptor afd = new AudioFileDescriptor(audioFile.getAbsolutePath());
 if (!data.contains(afd)) {
 data.add(afd);
 * get all tracks for agiven combination of genre name, artist name and album name. Any of
 * the parameters may be null or AudioDataModel.FILTER_ALL
 * Ugly code, I know, but it simply hard codes all combinations of the the mentioned
 * parameters. Any more elegant implementations welcome.
 * @param genreName String a genre name to get tracks for
 * @param artistName String an artist name to get tracks for
 * @param albumName String an album name to get tracks for
 * @return SortListModel the found tracks in a list model
public SortListModel getTracks(String genreName, String artistName, String albumName) {
 SortListModel foundTracks = new SortListModel();
 Iterator e = data.iterator();
 while(e.hasNext()) {
 AudioFileDescriptor afd = (AudioFileDescriptor) e.next();
 ID3v11Tag tag = afd.getID3v11Tag();
 if(genreName == null || genreName.equalsIgnoreCase(FILTER_ALL)) {
 if(artistName == null || artistName.equalsIgnoreCase(FILTER_ALL)) {
 if (tag.getAlbum().equalsIgnoreCase(albumName))
 foundTracks.add(afd);
 else {
 if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
 if (tag.getArtist().equalsIgnoreCase(artistName))
 foundTracks.add(afd);
 else {
 if (tag.getArtist().equalsIgnoreCase(artistName) &&
 tag.getAlbum().equalsIgnoreCase(albumName))
 foundTracks.add(afd);
 else {
 if(artistName == null || artistName.equalsIgnoreCase(FILTER_ALL)) {
 if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
 if (tag.getGenreName().equalsIgnoreCase(genreName))
 foundTracks.add(afd);
 else {
 if (tag.getGenreName().equalsIgnoreCase(genreName) &&
 tag.getAlbum().equalsIgnoreCase(albumName))
 foundTracks.add(afd);
 else {
 if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
 if (tag.getGenreName().equalsIgnoreCase(genreName) &&
 tag.getArtist().equalsIgnoreCase(artistName))
 foundTracks.add(afd);
 else {
 if (tag.getGenreName().equalsIgnoreCase(genreName) &&
 tag.getArtist().equalsIgnoreCase(artistName) &&
 tag.getAlbum().equalsIgnoreCase(albumName))
 foundTracks.add(afd);
 foundTracks.sort();
 return foundTracks;
 * list all artists in this model
 * @return SortListModel
public SortListModel listArtists() {
 SortListModel artists = new SortListModel();
 artists.add(FILTER_ALL);
 Iterator e = data.iterator();
 while (e.hasNext()) {
 ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
 String artistName = tag.getArtist();
 if (artists.indexOf(artistName) < 0) {
 artists.add(artistName);
 artists.sort();
 return artists;
 * list all artists in this model having titles belonging to a given genre
 * @param genreName String name of the genre artists are searched for
 * @return SortListModel
public SortListModel listArtists(String genreName) {
 SortListModel artists = new SortListModel();
 artists.add(FILTER_ALL);
 Iterator e = data.iterator();
 while (e.hasNext()) {
 ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
 String artistName = tag.getArtist();
 String genre = tag.getGenreName();
 if (artists.indexOf(artistName) < 0 && genre.equalsIgnoreCase(genreName)) {
 artists.add(artistName);
 artists.sort();
 return artists;
 * list all genres in this model
 * @return SortListModel
public SortListModel listGenres() {
 SortListModel genres = new SortListModel();
 genres.add(FILTER_ALL);
 Iterator e = data.iterator();
 while (e.hasNext()) {
 ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
 String genreName = tag.getGenreName();
 if (genres.indexOf(genreName) < 0) {
 genres.add(genreName);
 genres.sort();
 return genres;
 * list all albums in this model
 * @return SortListModel
public SortListModel listAlbums() {
 SortListModel albums = new SortListModel();
 albums.add(FILTER_ALL);
 Iterator e = data.iterator();
 while (e.hasNext()) {
 ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
 String albumName = tag.getAlbum();
 if (albums.indexOf(albumName) < 0) {
 albums.add(albumName);
 albums.sort();
 return albums;
 * list all albums in this model having titles belonging to a given genre
 * @param genreName String name of the genre albums are searched for
 * @return SortListModel
public SortListModel listAlbums(String genreName) {
 SortListModel albums = new SortListModel();
 albums.add(FILTER_ALL);
 Iterator e = data.iterator();
 while (e.hasNext()) {
 ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
 String albumName = tag.getAlbum();
 String genre = tag.getGenreName();
 if (albums.indexOf(albumName) < 0 && genre.equalsIgnoreCase(genreName)) {
 albums.add(albumName);
 albums.sort();
 return albums;
 * list all albums in this model having titles belonging to a given genre and artist
 * @param genreName String name of the genre albums are searched for
 * @param artistName String name of the artist albums are searched for
 * @return SortListModel
public SortListModel listAlbums(String genreName, String artistName) {
 SortListModel albums = new SortListModel();
 albums.add(FILTER_ALL);
 Iterator e = data.iterator();
 while (e.hasNext()) {
 ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
 String albumName = tag.getAlbum();
 String genre = tag.getGenreName();
 String artist = tag.getArtist();
 if(genreName == null || genreName.equalsIgnoreCase(FILTER_ALL)) {
 if (albums.indexOf(albumName) < 0 &&
 artist.equalsIgnoreCase(artistName))
 albums.add(albumName);
 else {
 if (albums.indexOf(albumName) < 0 &&
 genre.equalsIgnoreCase(genreName) &&
 artist.equalsIgnoreCase(artistName))
 albums.add(albumName);
 albums.sort();
 return albums;
 * get the number of audio tracks stored in this data model
 * @return int the number of tracks
public int getTrackCount() {
 return data.size();
/** constant to select all items of a given part */
public static final String FILTER_ALL = " all";
}...and here the changed CollectionThread now caching found File objects in a vector
* Light Development Playlist Editor
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.app.playlisteditor.data;
import com.lightdev.lib.util.InfoThread;
import java.io.File;
import java.util.Vector;
import java.util.Enumeration;
* A class to collect audio data from a given storage location.
* 
* <code>CollectionThread</code> uses ID3 tag information to gain data.
* 
* See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software as well as any licensing notes
* inside this documentation
* @version 1, October 13, 2004
public class CollectionThread extends InfoThread {
 * constructor
 * @param model AudioDataModel the data model to collect data to
public CollectionThread(AudioDataModel model) {
 this.model = model;
 * constructor, creates a new empty AudioDataModel
public CollectionThread() {
 this(new AudioDataModel());
 * set the data model to collect data to
 * @param model AudioDataModel the model to collect data to
public void setModel(AudioDataModel model) {
 this.model = model;
 * get the data model associated to this thread
 * @return AudioDataModel the data model
public AudioDataModel getModel() {
 return model;
 * set the directory to collect data from
 * @param rootDir File the directory to collect data from
public void setRootDirectory(File rootDir) {
 this.rootDir = rootDir;
 * this is the method to prepare a thread to run.
protected void prepareThread() {
 maxValue = -1;
 filesProcessed = 0;
 innerCount = 0;
 fileList = new Vector();
 * do the actual work of this thread, i.e. iterate through a given directory
 * structure and collect audio data
 * @return boolean true, if work is left
protected boolean work() {
 boolean workIsLeft = true;
 if(getStatus() < STATUS_HALT_PENDING) {
 countElements(rootDir.listFiles());
 if(getStatus() < STATUS_HALT_PENDING) {
 workIsLeft = collect(); //collect(rootDir.listFiles());
 fileList.clear();
 fileList = null;
 return workIsLeft;
 * count the elements in a given file array including its subdirectories
 * @param files File[]
private void countElements(File[] files) {
 int i = 0;
 while (i < files.length && getStatus() < STATUS_HALT_PENDING) {
 File file = files;
if (file.isDirectory()) {
countElements(file.listFiles());
else {
fileList.add(file);
i++;
maxValue++;
* read data into model
* @param files File[] the file array representing the content of a given directory
* @return boolean true, if work is left
private boolean collect(/*File[] files*/) {
Enumeration files = fileList.elements();
while(files.hasMoreElements() && getStatus() < STATUS_HALT_PENDING) {
File file = (File) files.nextElement();
try {
model.addTrack(file);
catch(Exception e) {
fireThreadException(e);
filesProcessed++;
if(++innerCount > 99) {
innerCount = 0;
fireThreadProgress(filesProcessed);
return false;
int i = 0;
while(i < files.length && getStatus() < STATUS_HALT_PENDING) {
File file = files[i];
if(file.isDirectory()) {
collect(file.listFiles());
else if(file.getName().toLowerCase().endsWith("mp3")) {
try {
model.addTrack(file);
catch(Exception e) {
fireThreadException(e);
i++;
filesProcessed++;
fireThreadProgress(filesProcessed);
return (i<files.length);
/** the directory to collect data from */
private File rootDir;
/** the data model to collect data to */
private AudioDataModel model;
/** the number of files this thread processed so far while it is running */
private long filesProcessed = 0;
/** a list to temporary store found files */
private Vector fileList;
/** counter to determine when to fire progress messages */
private int innerCount = 0;

Need Your Help!! thanks

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