objectpoolsample.java

这是一个关于J2EE的开源包common里的许多组件的示例应用程序,可以借鉴.

/**
 * 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.PoolableObjectFactory;
import org.apache.commons.pool.impl.StackObjectPool;

/**
 * Class description goes here.
 * @version 1.0  2005-12-5 
 * @author kevin
 */
public class ObjectPoolSample
{
	public static void main(String[] args) {
        Object obj = null;
        PoolableObjectFactory factory 
                = new PoolableObjectFactorySample();
        ObjectPool pool = new StackObjectPool(factory);
        try {
            for(long i = 0; i < 10 ; i++) {
                System.out.println("== " + i + " ==");
                obj = pool.borrowObject();
                System.out.println(obj);
                pool.returnObject(obj);
            }
            obj = null;//明确地设为null，作为对象已归还的标志
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            try{
                if (obj != null) {//避免将一个对象归还两次
                    pool.returnObject(obj);
                }
                pool.close();
            }
            catch (Exception e){
                e.printStackTrace();
            }
        }
    }

}