The code for sleeping barber problem. When the status of the barber
is set to busy then the customer cannot have a hair cut and is added to the
waiting queue. when the customer is set to free then the customer have a
hair cut.
Here the problem is that only the first customer have a hair cut and the other
customers added in the queue cannot have a hair cut.
Any help will be appreciated.
customeradd class:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* cutomeradd.java
*
* Created on Apr 4, 2010, 12:47:17 PM
*/
package gui;
import customer.Customer;
/**
*
* @author hp
*/
public class cutomeradd extends javax.swing.JFrame {
public static int enteredcustomerpos=1;
/** Creates new form cutomeradd */
public cutomeradd() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOTe modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
addCusotmer = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addCusotmer.setText("Add");
addCusotmer.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addCusotmerActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(71, 71, 71)
.addComponent(addCusotmer)
.addContainerGap(98, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(42, 42, 42)
.addComponent(addCusotmer)
.addContainerGap(57, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
@SuppressWarnings("static-access")
private void addCusotmerActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.out.println("the position of the customer is "+enteredcustomerpos);
Customer cust=new Customer();
cust.setPosition(enteredcustomerpos);
enteredcustomerpos++;
Thread customer=new Thread(cust);
customer.start();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new cutomeradd().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton addCusotmer;
// End of variables declaration
}Customer class
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package customer;
import barber.Barber;
/**
*
* @author hp
*/
public class Customer extends Thread{
public int position=0;
public int getPosition() {
return position;
}
public void setPosition(int position) {
this.position = position;
}
Barber bar=new Barber();
@Override
public void run()
{
// Thread currentcust=Thread.currentThread();
this.bar.cuthair(position,this);
// this.bar.cuthair(position,currentcust,this);
// this.bar.run();
}
}Barber class
package barber;
import customer.Customer;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author hp
*/
public class Barber extends Thread {
//setting the status of the barber to sleep
public static int status=0;
public static List queue=new LinkedList();
public static int custpos=0;
//Customer currentcust=new Customer();
// public static int pos=0;
// //private Random rand=new Random(System.currentTimeMillis());
//
//
//
@SuppressWarnings("static-access")
public synchronized void cuthair(int position,Thread currentcust)
{
System.out.println("the name of the current thread is "+currentcust.getName());
if(status==1)
{
custpos=position;
System.out.println("the customer in "+position+" has been added to the queue");
queue.add(currentcust);
while(status==1)
{
System.out.println("inside the while loop");
try
{
System.out.println("customer is waiting for the barber to be free");
wait();
}
catch(InterruptedException ex)
{}
}
//
//
//
try {
process(position);
} catch (InterruptedException ex) {
Logger.getLogger(Barber.class.getName()).log(Level.SEVERE, null, ex);
}
run();
}
else
{
queue.add(currentcust);
try {
System.out.println("barber is sleeping");
process(position);
} catch (InterruptedException ex) {
Logger.getLogger(Barber.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
// @SuppressWarnings("static-access")
public synchronized void process(int position) throws InterruptedException
{
this.status=1;
for(double i=0;i<999999999;i++)
{
}
// queue.remove(currentcust);
this.status=0;
notifyAll();
System.out.println("the size of the queue is "+queue.size());
System.out.println("the cusotmer in "+position+" has been served");
System.out.println("the status of the barber is "+status);
}