I am trying to implement Object Pool which has fixed number of Objects to be available for pool and using wait if pool if empty and notify when a thread releases an object.
I am able to achieve the above required functionality using below program.
I want to know if the implementation is correct or needs any modification from Interview point of view ?
import java.util.ArrayList;
import java.util.List;
class ObjectPool
{
static List objects = new ArrayList();
static
{
objects.add("Object One");
objects.add("Object Two");
}
public Object getObject()
{
synchronized(objects)
{
if(objects.isEmpty())
{
System.out.println(Thread.currentThread().getName() + " waiting as Object Pool is empty");
try {
objects.wait();
System.out.println(Thread.currentThread().getName() + " Got Notification");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Object locked = objects.get(objects.size()-1);
objects.remove(locked);
System.out.println(Thread.currentThread().getName() + " got lock of object : "+ locked);
return locked;
}
}
public boolean release(Object released)
{
synchronized(objects)
{
System.out.println(Thread.currentThread().getName() + " releasing Object : "+released);
objects.notify();
return objects.add(released);
}
}
}
public class MainforObjectPool implements Runnable
{
static ObjectPool p = new ObjectPool();
public static void main(String[] args)
{
MainforObjectPool m = new MainforObjectPool();
Thread t1 = new Thread(m,"thread 1");
Thread t2 = new Thread(m,"thread 2");
Thread t3 = new Thread(m,"thread 3");
Thread t4 = new Thread(m,"thread 4");
Thread t5 = new Thread(m,"thread 5");
t1.start();
t2.start();
t3.start();
t4.start();
t5.start();
System.out.println("Main Thread Completed");
}
public void run()
{
Object locked = p.getObject();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
p.release(locked);
}
}
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