Slow execution, flickering graphics, and too many threads, oh my!

i wrote a little game called Aim, Fire! just to screw around.
its immense complexity involves shooting little targets that fly across the screen.
you can see it at http://www.brianmaissy.com/applets/aimfire
i made a class representing a target that paints itself and is its own thread.
its kinda nifty in a OOP sort of way: all i have to do is instantiate a target; and it takes care of the rest, notifying the driver program of anything important (like it getting shot)
the problem, however, is the speed changes significantly depending on how many targets are active, and the graphics are very flickery.
i think the problem may be that having multiple threads is slow.
i also tried buffering my graphics but it didnt work very well.
however that may just be because i did it wrong.
in fact i probably did a lot of things wrong - please notify me of anything you see that i did badly
so tell me what you think about the design of the program, and any suggestions you have to restructure it. would i do better just to stick everything in one thread, or even all in one class?
thanks very much!
here is the code: (also found at http://www.brianmaissy.com/applets/aimfire/aimFire/AimFire.java and http://www.brianmaissy.com/applets/aimfire/aimFire/Target.java)
package aimFire;
import java.applet.Applet;
import java.awt.Color;
import java.awt.Event;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Point;
import java.util.ArrayList;
import java.util.Random;
public class AimFire extends Applet{
     public static final int SPEED_CONSTANT = 500;
     public static final int MIN_X = 0;
     public static final int MIN_Y = 21;
     public static final int MAX_X = 399;
     public static final int MAX_Y = 399;
     Image ammoImage;
     private Random rand;
     private static final int CLIP = 10;
     private static final int TOTAL_TARGETS = 20;
     private int toBeAdded;
     private ArrayList<Target> targets;
     private int targetsKilled;
     private int ammo;
     private int score;
     private boolean gameActive;
     public void init(){
          setSize(400, 400);
          setBackground(Color.black);
        setCursor(getToolkit().createCustomCursor(getImage(this.getClass().getResource("crosshair.gif")), new Point(16, 16), "crosshair"));
        ammoImage = getImage(this.getClass().getResource("ammo.gif"));
        rand = new Random();
        ammo = CLIP;
        score = 0;
        gameActive = true;
        targetsKilled = 0;
        toBeAdded = TOTAL_TARGETS;
        targets = new ArrayList<Target>();
        sendRandom();
        sendRandom();
     public boolean mouseDown(Event e, int x, int y){
          if(gameActive && ammo > 0){
               ammo--;
               for(int count = 0; count < targets.size(); count++){
                    score += targets.get(count).hit(x, y);
               repaint();
          return true;
     public boolean keyDown(Event e, int key){
          if((char)key == ' ' && gameActive){
               ammo = CLIP;
               repaint();
          return true;
     private void sendRandom(){
        toBeAdded--;
          Target t = new Target(this, getGraphics(), rand);
          targets.add(t);
        new Thread(t).start();
        repaint();
     public void notifyOfDeath(Target t){
          targetsKilled++;
          targets.remove(t);
          if(toBeAdded > 0){
               sendRandom();
          if(targets.size()==0){
               gameActive = false;
          repaint();
     public void paint(Graphics g){
          g.setColor(Color.gray);
        g.drawLine(0, 20, 399, 20);
          for(int count = 0; count < ammo; count++){
               g.drawImage(ammoImage, count*10 + 3, 3, this);
          if(ammo == 0){
               g.drawString("press space to reload", 3, 13);
        g.drawString("Targets: " + targetsKilled + "/" + TOTAL_TARGETS, 230, 13);
        g.drawString("Score: " + score, 340, 13);
          if(!gameActive){
               g.setColor(Color.gray);
               g.drawString("Game Over", 170, 200);
               g.drawString("Score: " + score, 170, 230);
package aimFire;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;
public class Target implements Runnable{
     private AimFire a;
     private Graphics g;
     private int radius;
     private int xLocation;
     private int yLocation;
     private int xDirection;
     private int yDirection;
     private int xSpeed;
     private int ySpeed;
     public Target(AimFire driver, Graphics graphics, Random rand){
          this(driver, graphics, 3*(rand.nextInt(9)+ 2), rand.nextInt(1 + AimFire.MAX_X - 60) + 30 + AimFire.MIN_X, rand.nextInt(1 + AimFire.MAX_Y - 60 - AimFire.MIN_Y) + 30 + AimFire.MIN_Y, rand.nextInt(3)-1, rand.nextInt(3)-1, rand.nextInt(5)+1, rand.nextInt(5)+1);
          if(xDirection == 0 && yDirection == 0){
               if(rand.nextInt(2)==0){
                    if(rand.nextInt(2)==0){
                         xDirection = 1;
                    }else{
                         xDirection = -1;
               }else{
                    if(rand.nextInt(2)==0){
                         yDirection = 1;
                    }else{
                         yDirection = -1;
     public Target(AimFire driver, Graphics graphics, int r, int x, int y, int xDir, int yDir, int xSp, int ySp){
          a = driver;
          g = graphics;
          radius = r;
          xLocation = x;
          yLocation = y;
          xDirection = xDir;
          yDirection = yDir;
          xSpeed = xSp;
          ySpeed = ySp;
     public void run() {
          if(g!=null){
               paint();
               int count = 1;
               while(xLocation >= AimFire.MIN_X && xLocation <= AimFire.MAX_X && yLocation >= AimFire.MIN_Y && yLocation <= AimFire.MAX_Y){
                    unpaint();
                    if(count % (AimFire.SPEED_CONSTANT/xSpeed) == 0){
                         xLocation += xDirection;
                    if(count % (AimFire.SPEED_CONSTANT/ySpeed) == 0){
                         yLocation += yDirection;
                    paint();
                    count++;
               unpaint();
               a.notifyOfDeath(this);
     public int hit(int x, int y){
          if(Math.abs(x - xLocation) < radius/3 && Math.abs(y - yLocation) < radius/3){
               xLocation = -99;
               return 3;
          }else if(Math.abs(x - xLocation) < 2*radius/3 && Math.abs(y - yLocation) < 2*radius/3){
               xLocation = -99;
               return 2;
          }else if(Math.abs(x - xLocation) < radius && Math.abs(y - yLocation) < radius){
               xLocation = -99;
               return 1;
          }else{
               return 0;
     private void paint(){
          g.setColor(Color.red);
          g.fillOval(xLocation-radius, yLocation-radius, 2*radius, 2*radius);
          g.setColor(Color.white);
          g.fillOval(xLocation-2*radius/3, yLocation-2*radius/3, 4*radius/3, 4*radius/3);
          g.setColor(Color.red);
          g.fillOval(xLocation-radius/3, yLocation-radius/3, 2*radius/3, 2*radius/3);
     private void unpaint(){
          g.setColor(Color.black);
          g.fillOval(xLocation-radius, yLocation-radius, 2*radius, 2*radius);
}

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Selam Burak,
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Have you ever checked the log file switch sequency map?
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SELECT * FROM (
SELECT * FROM (
SELECT TO_CHAR(FIRST_TIME, 'DD/MM') AS "DAY"
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+, TO_NUMBER(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '08', 1, 0)), '999') "08:00"+
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+, TO_NUMBER(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '10', 1, 0)), '999') "10:00"+
+, TO_NUMBER(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '11', 1, 0)), '999') "11:00"+
+, TO_NUMBER(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '12', 1, 0)), '999') "12:00"+
+, TO_NUMBER(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '13', 1, 0)), '999') "13:00"+
+, TO_NUMBER(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '14', 1, 0)), '999') "14:00"+
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You can import your photos and videos in the Camera Roll on your iPad to your work computer using you usb cable, then delete them from your iPad by following the directions here: http://support.apple.com/kb/HT4083. If you also have photo stream photos that are not in your camera roll that you want to save, save them to your camera roll so they can be imported too. To do this, open your My Photo Stream album, tap Edit, tap the photos, tap Share, tap Save to Camera Roll. After importing them you can delete them from your iPad if you want by tapping Edit again, tapping the photos, then tapping Delete.
Once they are on your work computer, you can transfer them to a USB memory stick if you cannot leave them there.
Any photos on your iPad that were synced from your computer can be salvaged by using an app like PhotoSync to transfer them to your work computer over wifi. (They can't be saved to the camera roll and imported with your usb cable like photos in the camera roll.) Deleting these photos from your iPad will require using iTunes. Once you have your own computer again and can install iTunes, you can delete these remaining photos by creating an empty folder on your computer, then selecting this folder to sync to your iPad on the Photos tab of your iTunes sync settings and syncing.

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PLEASE HELP!
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Let's begin whit the screen: it's not vertikal lines or major distortions, just a subtle horisontal line that "wanders" from bottom to topp and some lagging from time to time. Looks like this: http://cl.ly/3i2W2o3S1D2T
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Lost connection whit internet and keyboard rarely happens and is probably due to something else, but thought that was good to have in mind.
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So I'v reinstalled a few times and it seems to improve the Mac. But 2-3weeks later every error is back, even if I barely installed or downloaded anything!?!
Any idea what this could be? Or is the graphic card broken and MacStore has a blind, inbred muppet as a technician?

No I didn't. The first time i explained the problem thoroughly and thought that they just couldn't miss such a visual error. I was wrong. The second time the technician wasn't there so i showed the above clip to the salesstaff and explained everything onceagain. Later the technician called me and we talked for 10min.
Btw, the problems always "manifests themselves", just varies between strenght and frequence.
But all other issues aside, what could cause the tearing of the screen as seen int the above clip?

Re: Too many threads?

It would depend on the type of application and the target platform but I would certainly agree that 20 would be plenty for the vast majority of circumstances.
Writing a Thread pool conforming to the following interface (for example) is quite straightforward:
public interface ThreadPool
public void run(Runnable runnable);
}Using a Thread pool has the added bonus that you can try using a new Thread for each Runnable or having a limited-size pool without having to change any code except the implementation of your ThreadPool.

Now why's Jive gone and generated a new Thread for my reply as well as creating a reply too, eh? Grr.

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Many thanks
Kieron

I use dropbox. I love it. It's free for up to 2GB of capacity. I'm editing my site from three different computers. It eliminates any confusion regarding which file was the last one edited, which machine it's on, etc. I keep my domain file in dropbox and keep an alias in the left sidebar of the finder window. So all I have to do to edit my site is double click the domain file alias in any finder window, no matter what computer I'm working on. The dropbox website also keeps backups of your files so in case you ever lose your work, you can retrieve a back up from DropBox.com.
One thing you need to be careful about is to not edit your file from two different computers at the same time, The file can become corrupted if you do this.
David

SQL Blocking notification - at high monitoring level and holding many threads in Sharepoint 2010

I am getting the following error in our SharePoint 2010 environment:
Unexpected PortalSiteMapProvider was unable to fetch current node, request
Account Pipeline Dashboard/EditForm.aspx, message: Thread was being aborted.
Any ideas?
-Kash

There could be multiple reasons for this, one possible reason is that your application pool account does not have full permissions to read the complete site collection.
Identify your web apps' app pool account using inetmgr
Login to central site administration
Go to Application management > Policy for web application
Choose the web application where the inaccessible site collection exists
Add a full control policy for the app pool account
Try below command:
$wa = Get-SPWebApplication -Identity "http://intranet.mysite.com"
$wa.Properties["portalsuperuseraccount"] = "i:0#.w|pro1766\sp_superuser_cache" $wa.Properties["portalsuperreaderaccount"] = "i:0#.w|pro1766\sp_superreader_cache"
$wa.Update()
Also try below hotfix
http://blogs.msdn.com/b/joerg_sinemus/archive/2013/02/12/february-2013-sharepoint-2010-hotfix.aspx
If this helped you resolve your issue, please mark it Answered

Music playlist shows wrong cover and too many songs

On my iPhone 4s, I just did the upgrade to iOS 7 (I did a fresh install to be sure) and I am using iTunes 11.1
So now my playlist in the Music app is messed up.
In iTunes, I have both: just normal playlists and playlist-folders (which themselves have playlists)
e.g. A Folder is called "The Alan Parsons Project" and underneath there are the playlists ("I Robot", "On Air", ...)
The problem is with this playlist folders:
On the iPhone, the Music app shows me the right folder name, but it shows me a wrong cover. The same wrong cover for each playlist-folder!
The playlists themselves appear with the right cover
Any other music app (Track 8, CarTunes), that ist able to show the number of songs, shows me the folder names, each containing all my songs!
Normal playlists are shown correctly.
Any suggestions?

Thank you! This was driving me crazy. I had this issue when I initially installed iOS 7. At that time I removed all my music and resynced, and then the correct art displayed. I recently had to restore my iPhone and resync, and the bug of wrong art for playlist folders came back. (Strangely, it consistently displayed the same wrong art and displayed the same wrong art as when it happened before.) I kept removing and resyncing my playlists and deleting the iTunes album art cache to no avail. The fix of renaming the folders worked!

Duplicates and too many formats in iTunes library

How do I clean up my iTunes library? I have duplicates of every song now in both AAC and MPEG formats in there. I would like to delete the duplicates and all the mpeg songs leaving only the AAC songs in my library to sync with my Nano. THANKS

Robert Jacobson has a script for removing duplicates here:
http://home.comcast.net/~teridon73/itunesscripts/
As for removing MPEG files, have you discovered the "kind" column. If you go to View>>View options, there is a check box to display it.
You could either sort on the kind field or create a smart playlist where Kind is the format you want to delete.
This will group files of the same type together, but you would have to delete them yourself.

UserTransaction and too many connections

This might sound a bit weird. I am just looking for some quick pointers here if possible. The OC4J version in use is 9.0.4.0.0. I am doing something along the following lines in a struts action class.
1) UserTransaction txn = ctx.lookup("java:comp/UserTransaction");
2) Connection conn = dataSource.getConnection();
3) txn.begin();
4) ..StatelessSessionBean call which uses a few entity beans (Bean Managed)
5) Direct updates using conn (no commits in this).
6) txn.commit
My issue is with step 4 above. It does some updates and this results in close to 500 plus physical db connections getting created when in UserTransaction. The beans are normal usual beans and the whole process works without issues if I get rid of UserTransaction with less than 50 physical connections.
I am just not able to pinpoint what exactly might be going wrong in the beans that such a large number of connections get created when in UserTransaction.
The datasource is along these lines
     <data-source
          class="com.evermind.sql.DriverManagerDataSource"
          name="xxxDB"
          location="jdbc/xxxDBCore"
          pooled-location="jdbc/xxxDBCore_non_tx"
          xa-location="jdbc/xa/xxxDBXA"
          ejb-location="jdbc/xxxDB"
          connection-driver="oracle.jdbc.driver.OracleDriver"
          username="xxxxxxxx"
          password="xxxxxxxx"
          url="jdbc:oracle:thin:@1.2.3.4:1521:xxx"
          min-connections="10"
     />
I check for the number of physical connections using the oc4j option
-Ddatasource.verbose=true which prints out the information.
If I set the max-connections attribute on the datasource, I get a Timeout waiting for connection exception in the app.
If any of this rings a bell and if you have any thoughts or suggestions, I would really appreciate it.
Thanks in advance
best regards
-Sudhir

Just to add to my above post, the messages on the cnsole are along the lines of ...
null: Connection com.evermind.sql.DriverManagerXAConnection@189c9fe allocated (Pool size: 0)
Created new physical connection: com.evermind.sql.DriverManagerXAConnection@12c820f
null: Connection com.evermind.sql.DriverManagerXAConnection@12c820f allocated (Pool size: 0)
Created new physical connection: com.evermind.sql.DriverManagerXAConnection@10eb09e
null: Connection com.evermind.sql.DriverManagerXAConnection@10eb09e allocated (Pool size: 0)
Created new physical connection: com.evermind.sql.DriverManagerXAConnection@16d7d9e
null: Connection com.evermind.sql.DriverManagerXAConnection@16d7d9e allocated (Pool size: 0)
Created new physical connection: com.evermind.sql.DriverManagerXAConnection@e3f9e3
null: Connection com.evermind.sql.DriverManagerXAConnection@e3f9e3 allocated (Pool size: 0)
Created new physical connection: com.evermind.sql.DriverManagerXAConnection@10382ca
null: Connection com.evermind.sql.DriverManagerXAConnection@10382ca allocated (Pool size: 0)
Created new physical connection: com.evermind.sql.DriverManagerXAConnection@17faec2
Why would the pool size be 0?

Slow execution, flickering graphics, and too many threads, oh my!

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