Producer Consumer Using Semaphore

Producer Consumer Using Semaphore 


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package producerconsumer_usingsemaphore;

import java.util.Random;
import java.util.concurrent.Semaphore;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Mahi
 */
public class ProducerConsumer_usingSemaphore {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Stock myStock = new Stock();
        Producer pT = new Producer(myStock);
        Producer pT2 = new Producer(myStock);
        Consumer cT = new Consumer(myStock);
        
        //pT.start();
        cT.start();
        //pT2.start();
    }
    
}

class Stock{
    public int QOH = 0;
    static Semaphore producerSem   = new Semaphore(1);
    static Semaphore consumerSem   = new Semaphore(0);

   public void setQOH(int amount){
        try {
            producerSem.acquire();
            if(amount > 0){
                QOH = QOH+amount;
                Thread.sleep(50);
            }
            producerSem.release();
        }catch (InterruptedException ex) {
            System.out.println("Error on producer thread");
        }
   }
   
   public void getQOH(int amount){
        try {
            consumerSem.acquire();
            if(amount < QOH){
                System.out.println("Redusing form the QOH ...");
                QOH  = QOH - amount;
                System.out.println("New QOH is : " + QOH);
                Thread.sleep(100);
                
            }
            consumerSem.release();
        }catch (InterruptedException ex) {
            System.out.println("Error on the Consumer thread..");
        }
   }

}

class Producer extends Thread{
    Stock st;
    Random myRand = new Random();

    public Producer(Stock st) {
        this.st = st;
    }

    @Override
    public void run() {
        for(int a=0; a<10; a++){
            System.out.println("Adding items....");
            st.setQOH(myRand.nextInt(100));
            System.out.println("Current QOH is : " + st.QOH);
        }
    }
}

class Consumer extends Thread{

    Stock st;
    Random myRand = new Random();

    public Consumer(Stock st) {
        this.st = st;
    }

    @Override
    public void run() {
        for(int a=0; a<10; a++){
            System.out.println("Consuming form the QOH..");
            st.getQOH(myRand.nextInt(100));
            System.out.println("Now the new QOH is : "+ st.QOH);
        }
    }
    
}


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