Stack Using Lock and Cndition

Stack Using Lock and Cndition 


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package stackusing_lock_condition;

import java.util.Random;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;

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

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
        //Testing with push, pops and dispya
        /*
        stack stk = new stack();
        stk.push(10);
        stk.push(20);
        stk.push(30);
        stk.push(40);
        stk.displayArray();
        */
        stack st = new stack();
        pusher t1 = new pusher(st);
        poper t2 = new poper(st);
        
        t1.start();
        t2.start();
        
    }
    
}

class stack{
    
    private final Lock myLock = new ReentrantLock();
    private final Condition isFull__Condition = myLock.newCondition();
    private final Condition isEmptu_Condition = myLock.newCondition();
    
    public int maxSize = 10;
    public int stackArr[];
    public int top;
    
    public stack(){
        stackArr = new int[maxSize];
        top = -1;
    }
    
    public boolean isEmpty(){
        if(top == -1) 
        {
            return true;
        }
            else{ 
                return false;
            }
    }
    
    public boolean isFull(){
        if(top == maxSize-1){
            return true;
        }
            else{
                return false;
            }
    }
    
    public void push(int val){
        myLock.lock();
        
        try {
                while(this.isFull()){
                    System.out.println("Now push operation is wating.. "
                            + "Arra is full");
                isFull__Condition.await();
                }
                top +=1;
                stackArr[top] = val;
                System.out.println("Item pushed... Index ; "+ top + 
                        " valuse : "+ val);
                isEmptu_Condition.signalAll();
        } 
        catch (InterruptedException ex) {
            Logger.getLogger(stack.class.getName()).log(Level.SEVERE, 
                                                        null, ex);
        }
        finally{
            myLock.unlock();
        }
    }
    
    public void pop(){
        myLock.lock();
        
            try {
                while(this.isEmpty()){
                    isEmptu_Condition.await();
                }
                top --;
                System.out.println("One item poped.. top valuse is :"+ top 
                        + "Iten valuse is -: " + stackArr[top]);
                isFull__Condition.signalAll();
            } 
            catch (InterruptedException ex) {
                Logger.getLogger(stack.class.getName()).log(Level.SEVERE, null, ex );
            }
            finally{
                myLock.unlock();
            }
    }
    
    public void top(){
        System.out.println("Top value is : "+ top 
                + "item is : " + stackArr[top]);
    }
    
    public void displayArray(){
        System.out.println("printing item : " + stackArr.toString());
    }

}

class poper extends Thread{
    stack myStack;
    
    public poper(stack st){
        this.myStack = st;
    }
    
    @Override
    public void run(){
        System.out.println("Poper start operation and poping like carazy...");
        for(int a=0; a<myStack.maxSize-1; a++){
            //System.out.println("poping index of " + a );
            myStack.pop();
        }
    }
}

class pusher extends Thread{
    stack myStack;
    private static Random myRand = new Random();
    public pusher(stack st){
        this.myStack = st;
    }
    
    @Override
    public void run(){
        System.out.println("Now the puser is pushing like carazy..");
        for(int a=0; a<myStack.maxSize; a++){
            myStack.push(myRand.nextInt());
        }
    }

}


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