Using threads
I'm trying to add a interminate progress bar to my app. I'll be connecting to a database to get information and store it into an ArrayList. Here is what I currently have:
import java.awt.*;
import java.sql.*;
import java.util.ArrayList;
import javax.swing.*;
public class MusicList extends javax.swing.JPanel
/** Creates new form MusicList */
public MusicList ()
initComponents ();
/** Removed generated code **/
static ArrayList al = new ArrayList();
public static JDialog dialog = null;
public void main ( String arrgs[] )
Connect connect = new Connect();
showInDialog(this);
public static Frame getFrame (Component comp)
while(comp!=null && !(comp instanceof Frame))
comp=comp.getParent ();
return (Frame)comp;
public void showInDialog (Component comp)
dialog = new JDialog (getFrame (comp), "Connection Status");
dialog.getContentPane ().add (BorderLayout.CENTER, this);
dialog.pack ();
dialog.setLocationRelativeTo (comp);
dialog.setModal (true);
dialog.setVisible (true);
class Connect extends Thread
Connect()
start();
public void run()
connect();
private static void connect ()
try
MusicList.progressLabel.setText ("Connecting to database...");
Connection connection = Database.sqlConnection ();
MusicList.progressLabel.setText ("Downloading library list...");
Statement stmt = connection.createStatement ();
String sql = "SELECT * FROM audio";
PreparedStatement pstmt = connection.prepareStatement (sql);
ResultSet rs = pstmt.executeQuery ();
while (rs.next ())
MusicList.al.add (rs.getInt ("id") + "|" + rs.getString ("artist") + "|" + rs.getString ("title") + "|" + rs.getString ("path") + "|" + rs.getInt ("length"));
Database.closeResultSet (rs);
Database.closePreparedStatement (pstmt);
Database.closeStatement (stmt);
MusicList.progressLabel.setText ("Completing...");
Database.closeConnection (connection);
catch (SQLException e)
// Could not connect to the database
JOptionPane.showMessageDialog (null,"Unable to connect to the database.\n\nPlease check your network connection."
+ "Contact the administrator if the problem persists.", "Connection Error",
JOptionPane.ERROR_MESSAGE);
System.out.println ("Error: " + e.getMessage ());
}When it runs, the progress bar goes back and forth like it should, but nothing else executes. I used this as my guideline: http://data.uta.edu/~ramesh/help/JavaThreads-howto.html
Yeh, I honestly have no idea. I'm not sure where to
begin which is why I used the code from that site I
linked to and just changed the names to my classes
and methods.
The stuff is static because if it isn't, I keep
getting errors that I'm referencing a non-static
variable within a static method and such. If I had
'public static void main' and then
'showInDialog(this);' inside it, I get errors:
Compiling 1 source file to /home/tristan/Java
Programs/AudioStreamApp/build/classes
/home/tristan/Java
Programs/AudioStreamApp/src/MusicList.java:74:
non-static variable this cannot be referenced from a
static context
showInDialog(this);
istan/Java
Programs/AudioStreamApp/src/MusicList.java:74:
non-static method showInDialog(java.awt.Component)
cannot be referenced from a static context
showInDialog(this);
ome/tristan/Java
Programs/AudioStreamApp/src/MusicList.java uses
unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
2 errors
My reply to that is: you are way in over your head.
Start with a smaller program, this is too complicated for you at this time.
Read about instance and class members here:
http://java.sun.com/docs/books/tutorial/java/javaOO/classvars.html
Message was edited by:
dwg
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Using threads in a process of two or more tasks concurrently?
Dear,
I need to develop through a Java application in a process that allows the same process using Threads on two or more tasks can be executed concurrently. The goal is to optimize the runtime of a program.
Then, through a program, display the behavior of a producer and two consumers at runtime!
Below is the code and problem description.
Could anyone help me on this issue?
Sincerely,
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The producer-consumer problem
Known as the problem of limited buffer. The two processes share a common buffer of fixed size. One, the producer puts information into the buffer and the other the consumer to pull off.
The problem arises when the producer wants to put a new item in the buffer, but it is already full. The solution is to put the producer to sleep and wake it up only when the consumer to remove one or more items. Likewise, if the consumer wants to remove an item from the buffer and realize that it is empty, he will sleep until the producer put something in the buffer and awake.
To keep track of the number of items in the buffer, we need a variable, "count". If the maximum number of items that may contain the buffer is N, the producer code first checks whether the value of the variable "count" is N. If the producer sleep, otherwise, the producer adds an item and increment the variable "count".
The consumer code is similar: first checks if the value of the variable "count" is 0. If so, go to sleep if not zero, removes an item and decreases the counter by one. Each case also tests whether the other should be agreed and, if so, awakens. The code for both producer and consumer, is shown in the code below:
#define N 100 / * number of posts in the buffer * /
int count = 0, / * number of items in buffer * /
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insert_item (item) / * put an item in the buffer * /
count = count + 1 / * increment the count of items in buffer * /
if (count == 1) wakeup (consumer); / * buffer empty? * /
void consumer(void)
int item;
while (TRUE) { / * repeat forever * /
if (count == 0) sleep () / * if the buffer is full, go to sleep * /
remove_item item = () / * generates the next item * /
count = count - 1 / * decrement a counter of items in buffer * /
if (count == N - 1) wakeup (producer) / * buffer empty? * /
consume_item (item) / * print the item * /
To express system calls such as sleep and wakeup in C, they are shown how to call library routines. They are not part of standard C library, but presumably would be available on any system that actually have those system calls. Procedures "insert_item and remove_item" which are not shown, they register themselves on the insertion and removal of the item buffer.
Now back to the race condition. It can occur because the variable "count" unfettered access. Could the following scenario occurs: the buffer is empty and the consumer just read the variable "count" to check if its value is 0. In that instant, the scheduler decides to stop running temporarily and the consumer starting to run the producer. The producer inserts an item in the buffer, increment the variable "count" and realizes that its value is now 1. Inferring the value of "count" was 0 and that the consumer should go to bed, the producer calls "wakeup" to wake up the consumer.
Unfortunately, the consumer is not logically asleep, so the signal is lost to agree. The next time the consumer to run, test the value of "count" previously read by him, shall verify that the value is 0, and sleep. Sooner or later the producer fills the whole buffer and also sleep. Both sleep forever.
The essence of the problem is that you lose sending a signal to wake up a process that (still) not sleeping. If he were not lost, everything would work. A quick solution is to modify the rules, adding context to a "bit of waiting for the signal to wake up (wakeup waiting bit)." When a signal is sent to wake up a process that is still awake, this bit is turned on. Then, when the process trying to sleep, if the bit waiting for the signal to wake up is on, it will shut down, but the process will remain awake. The bit waiting for the signal to wake up is actually a piggy bank that holds signs of waking.
Even the bit waiting for the signal to wake the nation have saved in this simple example, it is easy to think of cases with three or more cases in which a bit of waiting for the signal to wake up is insufficient. We could do another improvisation and add a second bit of waiting for the signal to wake up or maybe eight or 32 of them, but in principle, the problem still exists.user12284350 wrote:
Hi!
Thanks for the feedback!
I need a program to provide through an interface with the user behavior of a producer and two consumers at runtime, using Threads!So hire somebody to write one.
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You can't just dump your requirements here and expect someone to do your work for you though. If this is your assignment, then you need to do it. If you get stuck, ask a specific question about the part that's giving you trouble. "How do I write a producer/consumer program?" is not a valid question. -
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Hello,
I want to create a program that can send 2 or more files through the socket to the same client at the same time. Is it possible?No. At least not in the way you're thinking.
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Exception occurred during event dispatching:
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at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(Unknown Source)
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at java.awt.Component.dispatchEvent(Unknown Source)
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at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
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at java.awt.Window.dispatchEventImpl(Unknown Source)
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at java.awt.EventQueue.dispatchEvent(Unknown Source)
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Hi,
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import java.awt.event.ActionListener;
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Hello,
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How to use threads to reconnect a socket to a server in TCP/IP
I want to know how to reconnect a socket to a server in TCP.
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Any suggestions will be really helpful..
please help.
Edited by: danish.ahmed.lnmiit on Jan 28, 2008 2:44 AMI want to know how to reconnect a socket to a server in TCP.There is no reconnect operation in TCP. You have to create a new Socket.
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Is there a way to find out what IE player I have installed? When I open an swf, its player 7, but I dont know what version IE is using... Thanks
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Hello, I just tried playing a multi player game of word mole which I havnt done for months and got the msg below uncaught exception: index 268 >= 268 After I click ok below the msg it would exit me. Does anyone know what this msg means and why it is