Apache Commons Pool2连接池代码

2013年，Apache Commons Pool 2.0 发布，这是一个完全重写的对象池的实现。实现的代码和原来差异很大，原来的一些例子就不能用了。按照上面的例子，用pool2的类和方法重写下。

ApacheCommons Pool 2.0 代码如下：

package test.ffm83.commons.pool;

 

import java.text.SimpleDateFormat;

import java.util.Date;

 

import org.apache.commons.lang.StringUtils;

import org.apache.commons.pool2.BasePooledObjectFactory;

import org.apache.commons.pool2.PooledObject;

import org.apache.commons.pool2.impl.DefaultPooledObject;

import org.apache.commons.pool2.impl.GenericObjectPool;

 

/**

 * commons pool的简单实用，基于2.x版本

 * 1. Factory  BasePooledObjectFactory

 * 2. Pool的配置   就是pool

 * 3. Pool实例   Resource

 * @author范芳铭

 */

public classPool2BaseUsage {

    public static void main(String[] args) {

        finalGenericObjectPool<Resource> pool =new GenericObjectPool<Resource>(

                newTestPoolableObjectFactory());

        pool.setMaxTotal(2);

        for (int i = 0; i < 6; i++) {

            new Thread(new Runnable() {

                @Override

                publicvoid run() {

                    try {

                        Resourceobj = pool.borrowObject();//注意，如果对象池没有空余的对象，那么这里会block

                        System.out.println(StringUtils.rightPad(obj.toString()+",获取对象", 50,"-"));

                        Thread.sleep(5000);

                        pool.returnObject(obj);//归还连接池资源

                        System.out.println(StringUtils.leftPad(obj.toString()+",归还对象", 50,"-"));

                    }catch(Exception e) {

                        e.printStackTrace();

                    }

                }

            }).start();

        }

    }

   

    /**

     * commons pool的简单实用，基于2.x版本

     * 1.x的 BasePoolableObjectFactory类修改为 BasePooledObjectFactory

     * @author范芳铭

     */

   

    static classTestPoolableObjectFactory extends BasePooledObjectFactory<Resource>{

        @Override

        public Resource create()throws Exception {

            return new Resource();

        }

 

        @Override

        publicPooledObject<Resource> wrap(Resource resource) {

            return newDefaultPooledObject<Resource>(resource);

        }

       

        /**

         * When an object is returned to the pool,clear the buffer.

         */

        @Override

        public voidpassivateObject(PooledObject<Resource> resource) {

            //resource.getObject().setRid(-1);

        }

    }

 

    static class Resource {

        public static int id;

        private int rid;

 

        public Resource() {

            synchronized (this) {

                rid = id++;

            }

        }

        public int getRid() {

            returnrid;

        }

        public void setRid(int rid){

            this.rid = rid;

        }

        @Override

        public String toString() {

            SimpleDateFormatdf = newSimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式

            Stringstr = df.format(newDate()) +","+ "id:"+rid;

            return str;

        }

    }

}

运行效果如下：

2014-12-19 15:51:58,id:1,获取对象---------------------

2014-12-19 15:51:58,id:0,获取对象---------------------

2014-12-19 15:52:03,id:0,获取对象---------------------

---------------------2014-12-1915:52:03,id:0,归还对象

---------------------2014-12-1915:52:03,id:1,归还对象

2014-12-19 15:52:03,id:1,获取对象---------------------

---------------------2014-12-1915:52:08,id:0,归还对象

2014-12-19 15:52:08,id:0,获取对象---------------------

---------------------2014-12-1915:52:08,id:1,归还对象

2014-12-19 15:52:08,id:1,获取对象---------------------

---------------------2014-12-1915:52:13,id:0,归还对象

---------------------2014-12-1915:52:13,id:1,归还对象