1 package org.sipdroid.net.tools;

     2 

     3 import java.util.ArrayList;

     4 

     5 public abstract class ObjectPool<E> {  

     6 	private ArrayList<Object> locked, unlocked;

     7 

     8 	ObjectPool(int size){

     9 		locked = new ArrayList<Object>(size);         

    10 		unlocked = new ArrayList<Object>(size);

    11 	}

    12 

    13 	public int getPoolSize() {

    14 		return locked.size() + unlocked.size();

    15 	}

    16 

    17 	abstract Object create();

    18 	abstract boolean validate( Object o );

    19 	synchronized Object checkOut(){     

    20 		if(unlocked.size() > 0){

    21 			Object cur = unlocked.get(0);

    22 			unlocked.remove(cur);

    23 			locked.add(cur);           

    24 			return(cur);

    25 		}      

    26 		// no objects available, create a new one

    27 		Object o = create();

    28 		locked.add(o);

    29 		return(o);

    30 	}

    31 

    32 	synchronized void checkIn( Object o ) {

    33 		locked.remove( o );

    34 		unlocked.add(o);

    35 	}

    36 

    37 }