/**
 * Title : Base Dict Class
 * Description : here Description is the function of class, here maybe multirows    
 * @author        kevin
 * @Version       1.0 
 */

package pool;

import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.StackObjectPool;

class SafePicker extends Thread {
    private ObjectPool pool;
    public SafePicker(ObjectPool op) {
        pool = op;
    }
    public void run() {
        Object obj = null;
        try {
            /* 略加處理 */
            synchronized (pool) {
                if ( pool.getNumActive() < 5 ) {
                    sleep((long) (Math.random() * 10));
                    obj = pool.borrowObject();
                }
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}

public class SafeMultiThreadPoolingSample {

    public static void main(String[] args) {
        ObjectPool pool = new StackObjectPool
                (new BasePoolableObjectFactorySample());
        Thread ts[] = new Thread[20];
        for (int j = 0; j < ts.length; j++) {
            ts[j] =  new SafePicker(pool);
            ts[j].start();
        }
        try {
            Thread.sleep(1000);
            System.out.println("NumActive:" + pool.getNumActive());
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}